In most cases dietary supplements especially in Libya are consumed without prescriptions and the public has very limited any awareness of their health risk. The lack of quality control on numerous brands of dietary supplements in pharmacies of Libya today may result in a serious health problem. The aim of this study is to determine the iron content using a fast and accurate method for quality control of some imported dietary supplements, based on spectrophotometric measurement of iron after complexation with 1, 10-phenanthroline in an acidic medium. Eight types of vitamin supplementary tablets were randomly collected from the Libyan market and analyzed for the iron content. The analysis showed an average value of 61mg Fe/pill for the range of 40.07-112.63 mg Fe/pill. Results showed that 75% of the samples were lower in iron content than that recorded on the dietary products. arabic 9 English 71
ezuldeen mohammed abraheem aboushalloua(1-2020)

يعد الشاي من أكثر أنواع المشروبات استهلاكا وله العديد من الفوائد لوجود العناصر الغذائية فيه خاصة العناصر الاساسية والعناصر النادرة، تم في هذه الد ا رسة تقدير محتوى الحديد الكلي لعدد 17 عينة من علامات تجارية مختلفة للشاي المتواجدة في السوق الليبي، تم تحضير العينات عن طريق الهضم الجاف وتم تقدير مستوى الحديد عن طريق القياس الطيفي، وأظهرت النتائج أن تركيز الحديد تا روح ما بين ) 0.1 إلى 2.5 مجم / لتر( بمتوسط قيمة ) 0.520 مجم / لتر(، لوحظ أقل تركيز ) 0.1 مجم / لتر( في ماركة شاي ليبتون، وأعلى تركيز ) 2.5 مجم / لتر( في العلامة التجارية شاي الكبشين.
أبوبكر عامر بشير الطروق(10-2021)

Twenty-five authentic samples of Prunus amygdalus gum samples were collected from five different locations in northwest of Libya. Different physicochemical methods were used to characterize this type of gum samples. The mean values of the moisture ranged from 12.55 to 14.93%, ash mean values 4.03 to 4.62%, pH 3.89 to 4.40, W.H.C 52.85 to 60.0%, and O.H.C 136.2 to 156.3%. Solubility of Prunus amygdalus gum showed that it had low solubility in distilled water with the mean values ranged from 20.01 to 35.40%, but it dissolved perfectly in alkali media where solubility increased to 96.3% in 0.05 M Na2CO3. The study exhibited that the mean values of cationic concentration in %(w/w) such as calcium was ranged from 0.552 to 0.585, potassium 0.402 to 0.505, iron 0.0975 to 0.1125, and sodium 0.064 to 0.079, which indicates that Ca has the highest concentration of metallic ions present. Atomic absorption method indicate that all samples contain traces of elements, Li, Cr, Mn, Ni, Zn, Pb, Hg, and Cd. The main functional groups recorded from FTIR spectrum included bands at 3293 cm-1 (O-H in carboxylic group), 1601.77 cm-1 (C=O, amide N-H bend, and C=C), 1357.53 cm-1 (CH3-, and C-O-H in- plane bending vibration), and 1025.74 cm-1 (C-O stretching). arabic 16 English 99
Aborawi M. Elgornazi, M.H. Awad, Nouri M.A. Soleiman(2-2021)