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Article
Rubber Seed Oil Properties, Authentication and Quality Assessment Using (Chloroform: Methanol) as Solvent

Authors: Emad Yousif --- Bashar Abdullah --- Hanan Ibraheem --- Jumat Salimon --- et al.
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2013 Volume: 16 Issue: 3 Pages: 1-6
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Physicochemical and instrumental characterization of rubber (Hevea brasiliensis (kunth. Muell.)) seed oil (RSO) were carried out for the purpose of quality assessment, identification, and authentication. Properties such as free fatty acid (FFA %), acid value, color, saponification value, iodine value, and unsaponifiable matter were determined. Fatty acid (FA) composition and TAG profiles were determined using gas chromatography (GC) and high performance liquid chromatography (HPLC), respectively. Structural features of RSO were also determined using FTIR, 1H NMR and 13C NMR spectroscopy. The natural form of RSO is highly acidic (acid value=17.43±0.06 mg KOH/g). The saturated FAs are palmitic (9.10±0.06) and stearic (12.63±0.01), and the main unsaturated FAs are oleic (25.31±0.13), linoleic (36.31±0.09), and linolenic (15.78±0.18). The oil can be classified as semidrying. Polyunsaturated TAGs of LnLnL and LnOO were the major TAGs found in RSO. FTIR, 1H NMR and 13C NMR analysis confirmed that RSO is composed mainly of TAG of saturated and unsaturated FA.

الخواص الكيميائية الفيزيائية لزيت بذرة المطاط ((Hevea brasiliensis (kunth. Muell.) قد انجزت لغرض تقييم الجودة، تحديد الهوية، والتوثيق. الخواص مثل الحوامض الدهنية الحرة (FFA%) ، اللون، قيمة التصوبن، قيمة اليود والمواد الغير متصوبنة قد تم تحديدها. تركيب الحوامض الدهنية (FA) وتركيب (TAG) قم تم تحديدها باستخدام (GC) و(HPLC) على التوالي. تركيب RSO قد تم تحديده باستخدام FTIR، 1H NMR و13C NMR. الشكل الطبيعي للRSO عالي الحامضية (قيمة حامض= 17.43±0.06 ملغم KOH/غم). الحوامض الدهنية المشبعة هي palmitic (9.10±0.06) و stearic (12.63±0.01) والحوامض الدهنية الرئيسية الغير مشبعة هي oleic (25.31±0.13)، linoleic (36.31±0.09) و linolenic (15.78±0.18). يمكن تصنيف الRSO كجزئي الجفاف. TAGs الغير مشبعة الرئيسية الموجودة في RSO هي LnLnL و LnOO. التحليل باستخدام FTIR، 1H NMR و 13C NMR أكد بان RSO يتكون بصورة رئيسية من الحوامض الدهنية المشبعة والغير مشبعة.


Article
STUDYING THE CONDUCTIVITY OF POLYSTYRENE USING 2-(SUB.)-5- [3-(5-NITRO-FUR-2-YL)-PROPEN-2-YLDIENE]AMINO 1,3,4- THIDIAZOLES AS ADDITIVES BY MEASURING FORBIDDEN ENERGY GAP

Authors: Jumat Salimon --- Nadia Salih --- Ayad Hameed --- Mohammed Abdul Nabi --- et al.
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2010 Volume: 13 Issue: 3 Pages: 30-35
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The optical properties of Polystyrene in the region from (200-900 m) were studied usingUV-VIS spectrophotometer by preparing composites with different organic materials. The opticaldata analyzed and interpreted in term of the theory of phonon assisted indirect electronic transition.It is observed that the energy gap of the samples, affected by the type of organic doping, andincrease the conductivity of the polystyrene

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Article
The Effect of UV Aging on the Structure of PVC in the Presence of Organotin(IV) Compounds

Authors: Muna Bufaroosha --- Nadia Salih --- Angham G. Hadi --- Dina S. Ahmed --- et al.
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2020 Volume: 23 Issue: 1 Pages: 57-61
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

New photostabilizers of poly(vinyl chloride) (PVC) were synthesized and investigated the photostabilizing efficiency of the polymer films by ultraviolet (UV) experiment. The rate of photodecomposition constant have been calculated for PVC films as a method for evaluating the efficiency of the organotin(IV) complexes that used as a photostabilizers after 300 hour of irradiation. The results have showed that the additives had reduced the rate of photodecomposition constant of PVC films significantly with comparison to PVC (blank). The (kd) value for PVC films was the highest in the absence of any additives, and the lowest value in the presence of triphenyltin (IV) complex.

Keywords

Telmisartan --- Photodecomposition --- PVC --- Films --- UV.

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