العدد الاول من مؤتمر Lcca2022

Potentiometric studies of metal Complexes of 4-(4-nitrophenylazo) resorcinol (magneson) with Co(II), Cu(II), and Zn(II) ions in mixed solvent

Sun, 26 Jun 2022 00:00:00 GMT

Potentiometric studies of metal Complexes of 4-(4-nitrophenylazo) resorcinol (magneson) with Co(II), Cu(II), and Zn(II) ions in mixed solvent In this research work, the acid dissociation constants of 4-(4-nitrophenylazo) resorcinol = L1 and the formation constant of the metal chelates formed by this ligand with Co(II), Cu(II), and Zn (II) have been determined Potentiometrically at 288K in 75% ethanol-water mixture at 0.1M KNO3 ionic strength against 0.1 M KOH. The stability constants of metal complexes were detected at different temperatures. The thermodynamics parameters such as ΔG, ΔH and ΔS of binary complexes were determined using the Vant-Hoff equations to measure the effect of temperature on the stability of 4-(4-nitrophenylazo) resorcinol complexes with metal ion. The influence of solvents on the free ligand and their metal complexes have been determined and discussed

The role of TiO2 nanoparticles to enhance membrane antifouling properties: A short review

Wed, 26 Jan 2022 00:00:00 GMT

The role of TiO2 nanoparticles to enhance membrane antifouling properties: A short review Rosiah, Rohani; Abdelnaser, M. Elbreki The incorporation of nanoparticles (NPs) to membrane has developed the membrane separation to overcome fouling and to enhance antibacterial properties of membrane. To date, Titanium Oxide (TiO2) NPs are utilized in various industrial applications and recently the development in membrane technology, owing to their superb antifouling, antibacterial, thermal and mechanical stability. This study aims to evaluate the TiO2 NPs roles to enhance the membrane quality in terms of antifouling, antibacterial properties and the membrane performance. The contribution of this study is to bring the researcher’s attention for the TiO2 NPs importance to modify the membrane characteristics to overcome the fouling issues.

Biosorption of Eriochrome Black T (EBT) onto Pomegranate peel Powder (PPP): Equilibrium and Kinetic Studies

Sun, 26 Jun 2022 00:00:00 GMT

Biosorption of Eriochrome Black T (EBT) onto Pomegranate peel Powder (PPP): Equilibrium and Kinetic Studies Ashraf, El-Hashani; Hind, Mohammed Ahmed; Khaled, Edbey Biosorption of EBT molecules from aqueous solutions onto pomegranate peel powder (PPP) have been examined in a batch biosorption process. The biosorption procedure was found to be dependent on biosorbent dose, pH of the solution, initial dye concentration, and contact time. The experimental equilibrium biosorption data were inspected by Langmuir, Freundlich, Temkin and Dubinin ̶ Radushkevic isotherms models. The Langmuir model gave the best fit by higher correlation coefficient( R2 =0.966, it assumes as monolayer adsorption). The maximum biosorption capacities determined from the Langmuir, isotherm models was71.42mg/g, at optimum circumstances. The kinetic studies showed that the biosorption operation of the EBT dye obeyed well pseudo-second-order model. According to the determined biosorption capacity, pomegranate peel powder is considered to be an effective, low cost, and environmentally friendly biosorbent for the removal of EBT dye from aqueous solutions

Activation energy of controlled carboxymethyl cellulose size in dilute solution: conductivity measurements

Sun, 26 Jun 2022 00:00:00 GMT

Activation energy of controlled carboxymethyl cellulose size in dilute solution: conductivity measurements Fathi, Elashhab; Lobna, Sheha; Rasha, M. Sheltami; Randa, Fawzi Elsupikhe; Abdelsallam, EA Youssef; Tahani, Alfazani In this research, the conductivity (κ) of carboxymethyl cellulose (CMC) solutions of different concentrations and chains length was studied at various temperatures. κ was found to increase with increasing concentration, temperature, and decreasing the chain length of CMC. The activation energy (Eκ) of the different solutions was estimated according to the Andrade equation, Eκ was increased with increasing concentration and decreasing the chain length of CMC. The results indicated that solute – solute contact is decreased and the solute-solvent interaction is increased in CMC solutions with increasing temperature and decreasing chain dimensions of CMC.

Adverse effect of chronic lead paint exposure among painting workers in Wadi AL-hayah, Obary, Libya

Sun, 26 Jun 2022 00:00:00 GMT

Adverse effect of chronic lead paint exposure among painting workers in Wadi AL-hayah, Obary, Libya Aboubaker, A. Elhadi; Apoajela, A. Ahmed Lead is a toxic and harmful substance that can impact the homeostasis process of blood components and blood pressure. The objective of the study was to evaluate blood lead levels among painting workers (lead paint exposed group) and in unexposed group (control group).The second objective was to investigate its impact on hematological components and blood pressure. A total of 64 adult male subjects whose ages ranged between 20-45 years were included in this study, 34 of painting workers and 30 subjects as a control group. All the results were statistically analyzed using SPSS version 14 for applying one way ANOVA test. The mean age of painting workers was 33.02 ± 7.02 years and 34.23 ±7.12 years control group. Blood lead, RBCs, WBCs, Hb, HCT, MCV, MCH and systolic, diastolic blood pressure were measured in the study. Blood Lead level of exposed group was 6.39±3.32 μg/dL and 1.25±0.58 μg/dL for unexposed group. Significant decrease in the levels of RBCs, Hb, MCV, HCT and MCH among lead paint exposed group as compared to unexposed group. On the other hand, WBCs levels were almost the same and were not significant for both groups. Systolic and diastolic blood pressure levels were significantly increasing in exposed group as compared to unexposed group. It is concluded that lead exposure has an adverse effect on hematological components and causes anemia. Lead exposure contributes to cardiovascular diseases by elevating blood pressure even at low lead levels. Moreover, long susceptibility to lead exposure deteriorates blood components and blood pressure.

Comparison between the Nicotine Content in Smokers and NonSmokers’ Blood Samples Collected from some Volunteers in ElBeida City, Libya Using RP-HPLC

Sun, 26 Jun 2022 00:00:00 GMT

Comparison between the Nicotine Content in Smokers and NonSmokers’ Blood Samples Collected from some Volunteers in ElBeida City, Libya Using RP-HPLC Galal, M. Elmanfe; Saadeldine, E. Taher; Alia, J. Abdulla Cigarette smoking is the main cause of death and disease in our society. It, clearly has a dangerous impact on the health of smokers and other people around them, alongside economic issues for the smokers. Nicotine is merely one among the several thousands of compounds identified in tobacco. The aim of this study was to determine of nicotine in blood samples in smokers and nonsmokers by developement of a rapid, simple, reliable, and one-step extraction method, in order to isolate and determine nicotine in human plasma samples using Reversed Phase - High Performance Liquid Chromatography (RP-HPLC), constituting liquid–liquid extraction with binary solvents to get better detection limit, linearity over high range, recovery, and no interference peaks. In the present study, twenty blood samples are collected from smokers and nonsmokers in El-Beida City, Libya. Samples are taken from an volunteer at the same time after each volunteer fills during a questionnaire. The method of analysis is validated over a wide linear range of 1.62–162.12 µg/mL with correlation coefficients being consistently greater than 0.9999. The results of nicotine concentrations in male smokers’ plasma are within the range of 3.292 - 66.398 µg/mL with an average of 11.950 µg/mL. Whereas its concentrations in nonsmokers’plasma are in the range of 3.3004 - 9.001 µg/mL with an average of 4.624 µg/mL. The average of the concentrations of nicotine in smokers’plasma is greater than non-smokers plasma. The criteria considered for validation are: limit of detection, limit of quantitation, linearity, accuracy, precision and confidence limit. Statistical analysis show that the nicotine levels were significant difference within the smoker samples in contrast with the nonsmoker samples using RP-HPLC method.

KINETICS AND MECHANISM OF CLEANER PRODUCTION OF EPICHLOROHYDRIN

Sun, 26 Jun 2022 00:00:00 GMT

KINETICS AND MECHANISM OF CLEANER PRODUCTION OF EPICHLOROHYDRIN Iftikhar, Ahmad; Abdelsalam, Abuzreda; Abdelqader, Elabidi Epichlorohydrin is an important petrochemical which is a base material in the manufacture of epoxy resins. Epoxy resins have become firmly well established in countless applications and techniques. Currently, epichlorohydrin is produced by chlorohydrination of allyl chloride, derived by chlorination of propylene but the yield is limited to 60-65%. The process also releases chlorine causing air pollution problems in the area. This paper presents another alternative method of production of epichlorohydrin from allyl chloride using hydrogen peroxide as an oxidant and sodium tungstate or sodium molybdate as catalysts. This process will be environmentally safer and a cleaner process. The kinetics and mechanism of this process have been studied. The reaction is first order with respect to allyl chloride and catalyst (sodium tungstate or sodium molybdate) but zero order with respect to hydrogen peroxide. The energy of activation has been determined. A reaction mechanism has also been proposed.

Separation of Fe(II), Ni(II), Ca(II), and Mg(II) ions by Schiff bases complexation and reversed-phase high performance liquid chromatography

Sun, 26 Jun 2022 00:00:00 GMT

Separation of Fe(II), Ni(II), Ca(II), and Mg(II) ions by Schiff bases complexation and reversed-phase high performance liquid chromatography Nabil, Bader; Milan, Hutta; Heinz, -Martin Kuss; Aziza, Ahmida; Awad, Alhussadi; Mohamed, Elhuni The separation of Fe(II), Ni(II), Ca(II), and Mg(II) chelates of Schiff base ligand, N,N’- Bis(salicylidene)1,3-propylenediamine is reported on a column of silica. Metal chelates are well resolved with good peak shape and efficiencies when the mobile phase is linear gradients of Methanol in an aqueous sodium acetate (50mmol/L, pH 5.40), using diode-array detector at 240nm. The ligand N,N’-Bis(salicylidene)1,3-propylenediamine N,N’- Bis(salicylidene)1,3- propylenediamine, N,N’-Bis(salicylidene)-2,2- dimethyl-1,3-propylenediamine, and N,N’ Bis(2-Hydroxyacetophenone)- 2,2-dimethyl-1,3-propylenediamine have been separated in order to choose the ligand used for metal separation

Evaluation of Piptatherum miliaceum Plant Performance for Contaminated Soil Phytoremediation

Sun, 26 Jun 2022 00:00:00 GMT

Evaluation of Piptatherum miliaceum Plant Performance for Contaminated Soil Phytoremediation Nabil, Bader; Naden, El.mushaeti; Wijdan, Amer; Nessma, Alshelmani; Ursula, Telgheder Piptatherum miliaceum is a popular local plant growing in a wide area of Libya. Absorption of Piptatherum miliaceum for lead and chromium ion has been studied. The amount of lead and chromium has been determined in soil, roots and the green part of Piptatherummiliaceum using flame atomic absorption spectroscopy (FAAS) in order to detect the path of the metals through the plant parts. Piptatherum miliaceum accumulate chromium in the root according to phytostabilization mechanism.

Serum paraoxonase (PON-1) activity and concentration in patients with 4th stage of chronic kidney disease

Sun, 26 Jun 2022 00:00:00 GMT

Serum paraoxonase (PON-1) activity and concentration in patients with 4th stage of chronic kidney disease Mofida, Ramadan Makhloof; Dahlia, Ibrahim Badran Paraoxonase-1 (PON-1) is an enzyme with a glycoprotein structure that depends on calcium and it has cardio protective effects that protect low-density lipoprotein (LDL) and high-density lipoprotein (HDL) from oxidation and therefore retards atherosclerosis. As patients with chronic kidney disease (CKD) are at high risk of atherosclerotic, in this study, we aimed to investigate serum PON-1 activity and concentration levels among patients with 4th stage of CKD compared with the healthy control subjects, to find out the possibility of taking the PON-1 as a predictor marker of atherosclerosis in 4th stage of CKD patients. Materials and Methods: This study included 30 patients with confirmed diagnosis of 4th stage of CKD, and 30 healthy persons. Serum blood urea, creatinine, uric acid, Albumin, total cholesterol, HDL, LDL and serum triglycerides were measured. Serum level of PON-1 concentration was measured using ELISA technique, while Serum level of PON-1 activity was detected using a colorimetric method. Results: Our study showed significant increase (p<0.001) in the levels of Cholesterol, Triglyceride, LDL and VLDL in patients with 4th stage of CKD as compared to control group. Also, we found significant decreased levels of serum HDL and PON-1 in 4th stage of CKD as compared to control group (p<0.001). Conclusion: The diminution in the serum paraoxonase-1 activity and concentration may contribute to the accelerated development of atherosclerosis in patients with stage 4 of chronic kidney disease

Determination the levels of potassium bromate beside some heavy metals (Fe, Ni and Cu) in Tost and bread samples collected from some local markets in Al –Beida City by using spectrophotometer

Sun, 26 Jun 2022 00:00:00 GMT

Determination the levels of potassium bromate beside some heavy metals (Fe, Ni and Cu) in Tost and bread samples collected from some local markets in Al –Beida City by using spectrophotometer HAMAD., M.ADRES.HASAN; ABDULRRZIQ, .S.A.MOHAMED; KAREIMA, A.ABDELGHANI ALTHAFRY; GHANDOURA, .F. MOHAMMED The presence high levels of potassium bromate in bread is very undesirable considering its deleterious effects and heavy metals also are implicated in carcinogenesis, mutagenesis and teratogens . In our study standard curve of potassium bromate and heavy metals ( nickel , iron and copper ) the strategy showed good linearity regression (R2 = 0.99 ). linearity of the strategy was performed during a range 1- 5 ppm of KBO3 and therefore the method showed good linearity regression (R2 = 0.97) with y=0.157x , 10 – 50 ppm of Cu (R2 = 0.99 ), with y = 0.001 x , 1- 5 ppm of Ni, with y = 0.018 x and (R2 = 0.99 ) , 1-5 ppm of Fe with y= 0 . 59 x and (R2 = 0.99 ) and Which is showing good linearity, precision, accuracy and sensitivity, which might be used for determination heavy metals . The quantity of potassium bromate bread samples ranged from 0.38 to 13.72 ppm and therefore the amount of Ni in bread ranged from 0.66 to 2. 7 ppm the quantity of Cu ranged from 5 to 41 ppm and the quantity of Fe 0.003 ppm to 0.03 ppm

GEOCHEMICAL EVALUATION OF THE AL FAIDIYAH FORMATION FOR INDUSTRIAL USES: A CASE STUDY OF THE AL FATIAH QUARRY, NE LIBYA

Sun, 26 Jun 2022 00:00:00 GMT

GEOCHEMICAL EVALUATION OF THE AL FAIDIYAH FORMATION FOR INDUSTRIAL USES: A CASE STUDY OF THE AL FATIAH QUARRY, NE LIBYA Osama, R. Shaltami; Saad, K. El Ebaidi; Fares, F. Fares; Farag, M. EL Oshebi; Hwedi, Errishi; Abobakar, E. Algomati The purpose of this work is to evaluate Al Faidiyah Formation in Al Fatiah quarry for industrial uses, NE Libya. The bulk samples were analyzed for major oxides using by (ICP-MS) inductively coupled plasma-mass spectrometry technique. The analysis was done in the Nuclear Materials authority of Egypt. The chemical analysis data showed that the calcite mineral is the main carbonate mineral in study area. Al Faidiyah Formation contains high pure limestone, and is suitable for many industries (i.e. manufacturing process, chemical industry, neutralizes acids, construction process and steel industry).

Phytoremediation potential of Malva parviflora for some heavy metals in roadside soil in Benghazi, Libya

Sun, 26 Jun 2022 00:00:00 GMT

Phytoremediation potential of Malva parviflora for some heavy metals in roadside soil in Benghazi, Libya Nabil, Bader; Hanan, Al madani; Najwa, AboAhmed; Aya, Zobi; Nessma, Alshelmani; Rajab, Elkailany The extraction of Pb, Zn, and Ni from soil using Malva parviflora plant has been tested. The amount of heavy metals in soil, the part of the plant has been determined using atomic absorption spectroscopy. Biological absorption coefficient (BAC), bioconcentration factor (BCF), and translocation factor (TF) have been calculated for each element in order to understand the mechanism of extraction in the studied plant. Malva parviflora has the potential for phytoremediation of soils contaminated by heavy metal.

Optimization of a Colorimetric Sensor for Mercury (II) Ion Detection Using Albumin/Silver Nanoparticles

Sun, 26 Jun 2022 00:00:00 GMT

Optimization of a Colorimetric Sensor for Mercury (II) Ion Detection Using Albumin/Silver Nanoparticles Seham, Shaboun; Nagwa, H. S. Ahmida; Randa, Fawzi Elsupikhe; Najma., H. Towier; Rasha, M. Sheltami; Tahani, Soliman Alfazani; Imperiyka, hammad Metal nanoparticles have unique properties and different scientific, industrial, and environmental applications. In this study, an optical sensor has been optimized for mercury (II) ion detection. This sensor is based on the redox interaction of Hg (II) ions with Albumin/Silver Nanoparticles (Alb/AgNPs) in an aqueous solution. The addition of Hg (II) ions caused a visual color change from dark brown to colorless. The color change was proportion to the concentration of mercury ions. Different parameters affecting the Hg (II) and Alb/AgNPs interaction, such as the concentration of Alb/SNPs and the time of reaction, were carefully studied and optimized. Under the optimal experimental conditions, the difference absorbance (ΔA) at 440 nm was linearly proportional to Hg (II) ion concentration in the range from 0.293 µM to 2.340 µM with a limit of detection of 0.141µM. The optimized sensor was used to detect mercury (II) ions in samples of lightening cream products

Phytochemical Screening, Total Phenols and Total Flavonoids Content of Cynara cornigera roots

Sun, 26 Jun 2022 00:00:00 GMT

Phytochemical Screening, Total Phenols and Total Flavonoids Content of Cynara cornigera roots Yusra, F. Elmogharbi; Maraia, F. Elmhdwi; Fatma, A. Alsulayman The aim of the current study is to detected the phytochemical compounds in the methanolic extract of Cynara cornigera roots. In addition quantify the total phenol content (TPC), total flavonoid contents (TFC) using spectrophotometric methods. The total phenolic compounds determined by using Folin Ciocalteu. While, the total flavonoid contents of the extract determined using quercetin reference standard method. Phytochemical analyses of the extract was carried out using standard methods to assess the major classes of phytochemicals alkaloids, flavonoids, phenolic, tannins, saponins, steroids, terpenoids, carbohydrate and glycosides. Phytochemical screening revealed that all the tests were positive except alkaloids, saponins, and steroids. The total phenol and flavonoids content of the methanolic extract of Cynara cornigera roots show high concentration. The estimated phenolics and flavonoids content are 17.59 mg/g and 18.62 mg/g respectively. These findings suggest that the methanol extract of Cynara cornigera roots has potential invitro antioxidant activities. According to the obtained results, the roots of Cynara cornigera considered as a rich source of natural antioxidants since its methanolic extract contains many effective chemical compounds that demonstrate the highest free radical scavenging capacity

HYDROCHEMISTRY REVIEW OF AL DABOSIA, MASSAH, APOLLO AND AL HUFARA SPRINGS, AL JABAL AL KHDAR, NE LIBYA

Sun, 26 Jun 2022 00:00:00 GMT

HYDROCHEMISTRY REVIEW OF AL DABOSIA, MASSAH, APOLLO AND AL HUFARA SPRINGS, AL JABAL AL KHDAR, NE LIBYA Osama, R. Shaltami; Fares, F. Fares; Ismael, H. Bozakouk; Fathi, M. Salloum; Farag, M. EL Oshebi; Hwedi, Errishi; Mohammed, S. Aljazwi The water springs are the main sources for drinking and irrigation in Al Jabal Al Khdar, NE Libya. This study will be reviewed the hydrochemistry characterization of Al Dabosia, Massah, Apollo and Al Hufara springs. The results showed the Al Dabosia , Apollo and Al Hufara springs are characterized by moderate fresh water whereas Massah spring is characterized by hard fresh water. The piper diagram is classified the water springs as Ca HCO3 (II Type) except Apollo spring is contained CaMgCl (IV Type). Plot of Mg/Ca vs. Na/Ca ratio of water springs revealed the source of major ions were originated from limestone and terra rossa soil weathering. According to WHO (2018) the water springs in study areas should be treated for drinking water.

In Vitro Study of Biological Activity of Teucrium Davaeanum Extracts on Strains of Pathogenic Bacteria

Sun, 26 Jun 2022 00:00:00 GMT

In Vitro Study of Biological Activity of Teucrium Davaeanum Extracts on Strains of Pathogenic Bacteria Hadeel, A. Mohamed; Fathia, A. Mosa; Azeza, S. Mohamed; Mohamed, A. Egbash The major purpose of this study was to recognize the role of different extraction techniques (decoction, Soxhlet, and soaking) and solvents (water, ethanol, ethyl acetate, ether, and chloroform) on the antimicrobial activities of extracts of Teucrium davaeanum. These solvents were examined to determine the conditions for which extracts with a higher content of bioactive compounds. The Kirby-Bauer disk diffusion method was used to assess in vitro antimicrobial activity of the different crude botanical extracts against Gram-positive (Staphylococcus aureus) and -negative (Escherichia coli and Pseudomonas aeruginosa). The antibiotics Gentamycin, Ciprofloxacin, and Azithromycin were used for antimicrobial susceptibility tests. The microbial growth was determined by measuring the diameter of the zone of inhibition and the mean values are presented with ± S.E.M. The ethyl acetate extract showed the highest inhibition diameter of 20±1 mm at a concentration of 0.1 g/mL against S. aureus, so it is considered to have higher efficacy than Ciprofloxacin, which showed an inhibition diameter of 15 mm. The isolated essential oil is also showed powerful inhibition effect with a diameter of 12±2 mm against S. aureus and 10±2 mm towards P. aeruginosa at a concentration of 0.1 g/mL, so it is a higher antimicrobial effect than Gentamycin and Azithromycin, which showed an inhibition diameter of 10 mm. The cold aqueous extract afforded an inhibiting diameter of 7 mm against S. aureus at a concentration of 0.1 g/mL, so it is considered to be less effective compared to the antibiotics that used as control. Moreover, hot water showed a low inhibitory effect on E. coli with 3±1 mm at a concentration of 0.1 g/mL. The results of applying ethanol extract showed an inhibitory effect on S. aureus only with 4±1 mm, otherwise, the results of applying chloroform extract and diethyl ether showed no inhibitory effect. Therefore, the most active extract was ethyl acetate extract, followed by volatile oil and then the cold aqueous extract. This could be attributed to the higher content of bioactive compounds in both extracts of ethyl acetate extract and essential oil.

Evaluation of Some Trace Metals (Zn, Cd, Cu and Pb) in Sewage Sludge Samples Taken from Some Pumping Stations in Benghazi-Libya

Sun, 26 Jun 2022 00:00:00 GMT

Evaluation of Some Trace Metals (Zn, Cd, Cu and Pb) in Sewage Sludge Samples Taken from Some Pumping Stations in Benghazi-Libya Abd-Alsalam, H. Azzouz; Nuha, A. Naas; Khalid, M. Darwish Due to the little data available on the levels of trace metals concentration in sewage sludge in and around Benghazi city, it was necessary to determine the current concentration, composition, distribution and sources of trace metals in the sludge of different wastewater treatment plants. Accordingly, raw sewage sludge samples collected from sixteen wastewater-pumping stations at Benghazi city have undergone evaluation of pH and some trace metals concentrations (mainly Zn, Cd, Cu and Pb) in dried sludge using atomic absorption spectrophotometry. Their monthly and spatial variations in sludge have been described.

Lipase and Protease Production in Submerged and Solid State Fermentation by Candida rugosa using Olive Mills Wastes

Mon, 11 Apr 2022 00:00:00 GMT

Lipase and Protease Production in Submerged and Solid State Fermentation by Candida rugosa using Olive Mills Wastes Omar, A. S. Moftah; Zakia, M. Moftah To study the ability of using olive oil industry wastes by yeast strain Candida. rugosa to grow in solid state fermentation for lipase and protease production. Lipase production in submerged fermentation of olive mill waste water. The enzymes production was ranged from 4.2 to 9.8 IU/g of lipase on the second day of fermentation period and from 21 to 64.5 IU/g of protease on the third day of fermentation period. The supplementation of the olive oil cake with yeast extract as a nitrogen source significantly increased the lipase (157%) and protease (49 %) production. The chemical composition of olive oil cake estimated before and after fermentation process, results shown that the nutritional value was improved to be use as animal feed. Submerged fermentation of olive mill waste water shown that the yeast C. rugosa could growth on undiluted sample, and to produce up to 220.1 U/ dm-3 of lipase in 1st day, lipase production was found to be promoted by the addition of tween 80. The highest lipolytic activity of 1667.5 IU dm-3 was achieved after 6 days of submerged cultivation in supplemented olive mill wastewater. The results indicated that olive mill waste water and olive oil cake seemed to provide necessary nutrients and physical support for the yeast to grow and produce enzymes. The fermentation of olive mills wastes could be a good technique to save our environment and produce a valuable thing by using harmful wastes.

Spectroscopic characterization of extracellular polymeric substances (EPS) extracted from Pseudomonas putidaATCC 11172 produced under different carbon concentrations

Mon, 11 Apr 2022 00:00:00 GMT

Spectroscopic characterization of extracellular polymeric substances (EPS) extracted from Pseudomonas putidaATCC 11172 produced under different carbon concentrations Abubaker K. Elayatt, Abdelqader Imragaa The extracellular polymeric substances (EPS) extracted from Pseudomonas putida ATCC 11172, were used as model to quantify the effect of carbon concentration on the chemical composition of EPS.P. putida was grown using Luria broth (LB) medium with and without glucose in order to promote different EPS composition. The influence of glucose amount was studied by supplementing the LB medium with glucose at 0.5% w/v (LBG 0.5%) and 1.0% w/v (LBG 1%). The produced EPS was characterized by Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). FTIR were used to describe the difference in functional groups on free and bound EPS surfaces. XPS analysis was performed to quantify the element surface composition, to evaluate the local chemical environment of carbon and oxygen at the free and bound EPS, and to calculate the overall concentration of polysaccharides, peptide and hydrocarbon compounds of free and bound EPS. The combination of XPS and FTIR spectroscopy allows a more comprehensive characterization of free and bound EPS surfaces.

Solid phase extraction performance of polyureathane foam coated with Curcumin or Dithizone

Tue, 11 Jan 2022 00:00:00 GMT

Solid phase extraction performance of polyureathane foam coated with Curcumin or Dithizone Nabil, Bader; Halima, Algwiry; Arij, Shermado; Nessma, Alshelmani; Tasneem, Alzuwawi; Haneen, Alzwy Polyurethane foam (PUF) was physically functionalized with curcuminanddithizone to adsorb Fe3+ ions, applying the off-line solid phase extraction procedure. The concentrations of the metals have been determined using the molecular spectroscopy. Various factors including, the pH of the sample solution and the time of extraction were examined. The adsorption mechanism of metal 0ion onto coated PUF was tested using the Morris-Weber and Lagergren equations. The capacity sequence of the sorbent was in the order dithizone-PUF >curcumin-PUF

Natural pH Indicator from Potato Starch Films Incorporated with Curcumin

Tue, 11 Jan 2022 00:00:00 GMT

Natural pH Indicator from Potato Starch Films Incorporated with Curcumin Fateh, B. Eltaboni; Fardous, F. Almograbi; Honaida, N. Madi In this work, we developed a potato starch film incorporated with curcumin to be used as a pH-sensitive smart polymeric material, which could be applied as a pH probe in food industry. The Beer-Lambert law was used to characterize curcumin which was purchased from the pharmacy of alternative medicine in the city of Benghazi. As a control experiment, the visual colour changes of curcumin powder dissolved in buffered aqueous solution were examined at the pH rage of 5-11. It was found that the colour of the solution altered from yellow to reddish-brown, as the pH of the curcumin solution changed from 7 to 8. Curcuminwas also incorporated into the starch extracted from potato before being formed into an edible film using a solution casting method. The pH-sensitivity of film was investigated at varied pH values (pH 5-11), the visual colour variations of tapioca starch-curcumin film was noted. The colour of edible film changed from pale yellow to dark orange colour by increasing the pH.But, the addition curcumin to the potato starch film did not alter mechanical properties of starch. As a result of an alteration in film colours, the potato starch-curcumin film could be applied as a natural pH indicator for monitoring food spoilage based on the acidity changes. Likewise, an environmentally friendly indicator film was too accomplished

The effects of occupational exposure to petrol vapor on biochemical parameters of workers at Al zawiya oil refinery and Mellitah oil and gas refinery companies

Tue, 11 Jan 2022 00:00:00 GMT

The effects of occupational exposure to petrol vapor on biochemical parameters of workers at Al zawiya oil refinery and Mellitah oil and gas refinery companies Ghada, M. Salem; Sara, A. Hwisa; Yosra, M Algamodei; Maram, F Almalyan; Ahmed, Zaid; Fakhri, F. Aljidaemi; Salah, AB Bahroun The oil refineries are the most important of chemical industries which produce Benzene and its metabolites that among the most dangerous compounds are toxic oxidizers causing many serious health risks to oil refineries workers. This study aimed to analyze the effects of exposure to petrochemicals on biochemical parameters among workers at Al Zawia oil refinery and Mellituh oil and gas refinery companies and compared with the unexposed group. Methodology: Analysis of plasma samples and their comparison with biochemical tests of kidney and liver function among two groups designated as exposed (100 petroleum refineries workers) and control subjects (100 non-oil civil servants), respectively. Results: The exposed group had a significantly elevated mean concentration of alkaline phosphatase ALP (u/L) as compared to unexposed (178.2 ± 84.3 versus 132.32 ± 52.7, p = <0.001). Also, the mean aspartate aminotransferase AST (IU/L) levels were significantly higher in the exposed group compared with the unexposed group (25.6 ± 7.4 versus 23.5 ± 7.5, P = 0.03). Similarly, the mean serum alanine aminotransferase ALT (IU/L) levels were increased significantly in the benzene exposed group compared with the unexposed group (22.3 ± 9.47 versus 18.87 ± 9.6, P = 0.01), and the mean± SD of serum creatinine (mg/dL) and blood urea nitrogen (BUN) (mg/dL) levels were significantly increased (0.98 ± 0.27 versus 0.70 ± 0.24, P = < 0.001), and (33.9 ± 9.3 versus 22.4 ± 9.1, P = <0.001) in the benzene exposed group compared with the unexposed group, respectively. Conclusion: occupational exposure to benzene caused significant alterations in biochemical parameters indicating that workers may be at a higher risk of developing hepatic or renal related disorders.

In Silico Studies, partition coefficients and tissue permeability of Cu(II)Tripeptide species as Potential Anti-Inflammatory Drugs

Mon, 11 Apr 2022 00:00:00 GMT

In Silico Studies, partition coefficients and tissue permeability of Cu(II)Tripeptide species as Potential Anti-Inflammatory Drugs Ali., A. Alsaqir; Fatin, M. Elmagbari; Giselle, M. Vicatos; Ahmed, N. Hammouda; Graham, E. Jackson; Younis., O.Ben Amer; Rashd., M. El-Ferjani Rheumatoid arthritis (RA) is a form of chronic inflammation, a systemic autoimmune disorder that destroys synovial joints. The cause of RA is still unknown, and at present and there is no cure. RA is one of the most common types of chronic inflammatory polyarthritis. It represents a significant health burden with an approximately 1% prevalence worldwide. It mainly affects women, two times more than men. Copper complexes were used in the 1940's to 1970's for the treatment of the inflammation associated with RA. The ligands chosen were sarcosyl-L-histidyl-L-lysine (Sar-His-Lys), sarcosyl-L-lysyl-L-histidine (Sar-Lys His), sarcosyl-L-histidyl-L-histidine (Sar-His-His), sarcosyl-L-lysyl-L-lysine (Sar Lys-Lys), sarcosyl-L-glycyl-L-histidine (Sar-Gly-His) and sarcosyl-L-leucyl phenylalanine (Sar-Leu-Phe). Our previous studies have shown equilibrium constants of H+ , Cu(II), Ni(II) and Zn(II) with these tripeptides and the structures of the complex species were investigated using UV-Vis, ESR and 1H NMR spectroscopy. An objective of the study was to increase the available pool of copper in vivo. This was evaluated using a computer model of blood plasma, which considers competition with endogenous metal ions and ligands. It is particularly important that the ligands were evaluated using the Evaluation of Constituent Concentrations in Large Equilibrium (ECCLE) system, an in vivo speciation model of blood plasma. Dermal absorption is the preferred method of administration, and so this study used partition coefficients and tissue permeability studies to assess the bioavailability of the different complexes. Based on the results of this study, Sar Lys-His and Sar-Gly-His have a higher mobilising capacity than all the other tripeptides.

The role of TiO2 nanoparticles to enhance membrane antifouling properties: A short review

Tue, 11 Jan 2022 00:00:00 GMT

The role of TiO2 nanoparticles to enhance membrane antifouling properties: A short review RosiahRohani; Khalefa, A. Faneer; Abdelnaser, M. Elbreki The incorporation of nanoparticles (NPs) to membrane has developed the membrane separation to overcome fouling and to enhance antibacterial properties of membrane. To date, Titanium Oxide (TiO2) NPs are utilized in various industrial applications and recently the development in membrane technology, owing to their superb antifouling, antibacterial, thermal and mechanical stability. This study aims to evaluate the TiO2 NPs roles to enhance the membrane quality in terms of antifouling, antibacterial properties and the membrane performance. The contribution of this study is to bring the researcher’s attention for the TiO2 NPs importance to modify the membrane characteristics to overcome the fouling issues

Effect of frying process on some physicochemical properties of some edible oils

Mon, 11 Apr 2022 00:00:00 GMT

Effect of frying process on some physicochemical properties of some edible oils Frying is a popular cooking technique in the world and vegetable oil is widely used as the frying medium in this process. Deep-fat frying produces both desirable and undesirable compounds through various physical and chemical reactions. This research carried out to investigate the effect of frying process on some physicochemical properties of some vegetable oils. For these. Some vegetable oils (olive oil, corn oil, sunflower oil and flaxseed oil) were used chips frying for one hours, the frying was repeated three times and physicochemical tests were done before and after each time. These changes include refractive index, viscosity, density and peroxide value of these vegetable oil during the frying process. The result showed that refractive index and viscosity increased by increasing the frying process, as the unsaturation while the density decreased by progress of frying process, the peroxide value was increased after the 1st frying then the peroxide value decline as the frying process progress.

Evaluation of phosphorus concentration in soil by using spectrophotometer (UV )

Mon, 11 Apr 2022 00:00:00 GMT

Evaluation of phosphorus concentration in soil by using spectrophotometer (UV ) Attohami, .H .M .Ommar; Hassan, .A . A .Mohammed; Mohammed, .H .A . Nasser This study was carried out in the Sirte region, which is located 450 km east of the Libyan capital, Tripoli. During this study, 15 different agricultural soil samples were taken at a depth ranging between (0-20 cm) from 15 sites in Sirte region were evaluated in order to evaluate some natural and chemical parameters such as mechanical analysis and acidity, as well as images and phosphorous concentration in soil (available phosphorous). In this study, a single-beam UV spectrophotometer was used to estimate the absorbance of phosphorous. Through the analysis processes that were reached and estimation of some concentrations of phosphorus, it was found that several samples contain a high percentage of phosphorous, and several of them contain a low percentage, and the majority of samples range from medium to the last, which are considered suitable for global standards

Bromate Residual Contents In Some Brands of Bread And Bakery Products Collected From Benghazi`s Bakeries, Libya

Mon, 11 Apr 2022 00:00:00 GMT

Bromate Residual Contents In Some Brands of Bread And Bakery Products Collected From Benghazi`s Bakeries, Libya Mariam, Ambarak S. Busaadia; Nagwa, H. S. Ahmida; Najma., H. Towier; Randa., S. El-zwaey Potassium bromate is an oxidizing agent that has been used as a food additive added to preserve flavour or improve the taste and appearance of food, mainly in the process of making bread and baked products. The continuous consumption of potassium bromate is hazardous to human health. The aim of this study is to assess the safety of some bread and baked products by determining the residual potassium bromate using a spectrophotometric method, in twenty nine bread and different bakery products samples included; croissant, toast and cake, collected from different bakeries in Benghazi, Libya. The obtained results indicated that, the level of residual potassium bromate in the analyzed bread and baked samples ranged from 0.6138µg/g to 1.558µg/g, with mean concentration equal to 0.9641± 0.4 µg/g. A significant differences were found in the potassium bromate levels of the different analysed samples (P<0.05). The results of this study showed that the contents of potassium bromate in all analysed baked products were higher than permissible limit sets by Food and Drug Administration (FDA) and by Libyan Standard Regulations. The excessive consumption of potassium bromate has a highly toxic effects to consumer`s health.

GROUND WATER EVALUATION OF SELECTED TAZERBO WELLS, SE LIBYA

Mon, 11 Apr 2022 00:00:00 GMT

GROUND WATER EVALUATION OF SELECTED TAZERBO WELLS, SE LIBYA Osama, R. Shaltami; Fares, F. Fares; Souad, A. Moftah; Farag, M. El Oshebi; Hwedi, Errishi; Al bakosh, M; Mohamed, M. Soluman; Omar, A. Geniber In this work, we evaluate ground water quality of nine Tazerbo wells southeast Libya for drinking and irrigation uses. Nine ground water samples were subjected to Atomic absorption for major ions. The results showed the parameters of water samples are below the acceptable limit except (Fe). The plot of EC vs. Na % classified the water samples as excellent quality for irrigation uses. The source of major ions are originated mainly from silicate rocks. The iron level in the studied water samples are seriously affected on human health. The techniques that use to remove the iron from drinking water such as oxidation with chlorine, ozone, green sand filter and reverse osmosis.

A Comparison of Recent Analytical Methods for Analysis of Arsenic

Mon, 11 Apr 2022 00:00:00 GMT

A Comparison of Recent Analytical Methods for Analysis of Arsenic KHAMIS, ALI ATAYALLA Arsenic is one of the known toxic elements to human’s life. Never the less, the level of toxicity relies on the classification of chemical species of arsenic as organic or inorganic which being a big concern in industrial and environmental chemistry. different separation methods as HPLC or IC has been coupled to either ICP-MS or ICP–OES in order to increase sensitivity of determining As(III) and As(V), while for determining As(III) and total As need a chemical reduction of As(V) before utilise voltammetry .with the aim of having best technique to trace elements levels especially toxic elements , some aspects must to be advanced such as reducing chemical and physical interferences , high sensitivity , low LOD and LOQ , less time consuming , more accurate than conventional techniques and less cost equipment. Other methods as bio-components, ETAA, (INAA) and AAS have been showing promising future for analysis techniques.

Phytoremediation performance of Piptatherummiliaceum (smilograss)for Ni and Pb ions in roadside soil in Benghazi, Libya

Mon, 11 Apr 2022 00:00:00 GMT

Phytoremediation performance of Piptatherummiliaceum (smilograss)for Ni and Pb ions in roadside soil in Benghazi, Libya Nabil, Bader; Abir, Najem; Amal, Jamal; Nessma, Alshelmani; Amani, Alalem; Mohamed, Elhuni There is an increased concentrations of heavy metals in the roadside soils due the human activities. Soil and plant samples from the roadside areas in Benghazi city were collected and analysed using Flame atomic absorption spectrophotometry for their heavy metal contents. The total metal content of Ni and Pb has been determined in soil surrounded the plant roots, plant roots, and Leaves. In order to evaluate the performance of Piptatherummiliaceum to extract the metals from soil, different factors such as Biological Absorption Coefficient (BAC), Bioconcentration Factor (BCF), and Translocation factor (TF) have been calculated. The results showed that Piptatherummiliaceumis more suitable for phytostabilisation than phytoextraction. Phytoremediation as a green technology has many advantages over the other methods of heavy metals removal from soils.

Potentiometric studies of metal Complexes of 4-(4-nitrophenylazo) resorcinol (magneson) with Co(II), Cu(II), and Zn(II) ions in mixed solvent

Mon, 11 Apr 2022 00:00:00 GMT

Potentiometric studies of metal Complexes of 4-(4-nitrophenylazo) resorcinol (magneson) with Co(II), Cu(II), and Zn(II) ions in mixed solvent Nabil, Bader; TagdidaHiba; Younis, Ben Amer; Zainab, Al borki; Aziza, Ahmida In this research work, the acid dissociation constants of 4-(4-nitrophenylazo) resorcinol = L1 and the formation constant of the metal chelates formed by this ligand with Co(II), Cu(II), and Zn (II) have been determined Potentiometrically at 288K in 75% ethanol-water mixture at 0.1M KNO3 ionic strength against 0.1 M KOH. The stability constants of metal complexes were detected at different temperatures. The thermodynamics parameters such as ΔG, ΔH and ΔS of binary complexes were determined using the Vant-Hoff equations to measure the effect of temperature on the stability of 4-(4-nitrophenylazo) resorcinol complexes with metal ion. The influence of solvents on the free ligand and their metal complexes have been determined and discussed

Developments of coumarinanalogues from 2-acetyl-benzo[f]chromen-3-one.

Mon, 11 Apr 2022 00:00:00 GMT

Developments of coumarinanalogues from 2-acetyl-benzo[f]chromen-3-one. Basma, S. Baaiu; Anhar, Abdel‐Aziem The starting compound 2-(3-(dimethylamino)acryloyl)-3H-benzo[f]chromen-3-one (4) was prepared from the reaction of 2-acetylbenzo[f]coumarin-3-one (3) with DMFDMA in refluxing xylene. Reaction of enaminone4 with 6-aminothiouracil in acetic acid afforded 2-thioxo-2,3-dihydro-1H-pyrido[2,3-d]pyrimidin-4-one 6.The latter compound was used as the key molecule for synthesis of pyridotriazolopyrimidinones9a-d via its reactionwith various hydrazonoyl halides in dioxane and triethylamine.

The effective of citrate as capping agent on the band gap of γ-Fe2O3 nanoparticles

Mon, 11 Apr 2022 00:00:00 GMT

The effective of citrate as capping agent on the band gap of γ-Fe2O3 nanoparticles Enteisar, .M.Albrasi; Hanan, .M.Bokamada In this study, γ-Fe2O3 were synthesis by a chemical route at room temperature in the presence of a capping agent and without a capping agent. The capping agent used for covering Fe2O3 was tri-sodium citrate, the absorption spectra obtained by UV–Vis spectrophotometer in the wavelength range of 200 -800 nm. From this, it found that the optical band gap transitions of the γ-Fe2O3 nanoparticles in the absence of tri sodium citrate as 3.00 eV and with the present tri sodium citrate capped iron oxide as 2.28 eV. The sizes estimated utilizing observed band gaps data were in the range of 1.37 nm and 1.41 nm respectively the average sizes found to be increased as the band gap declined because of the quantum size effect