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Register a new userEvaluation of Antioxidant Activity of Some Natural Extracts and Propyl Gallate in Refined Palm Oil
تقييم الفعالية المضادة للأكسدة لبعض المستخلصات الطبيعية و جاليت البروبيل في زيت النخيل المكرر
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قُيمت فعالية بعض المصادر الطبيعية المحلية كمضادات أكـسدة مثـل مـستخلص قـشور البرتقـال و مستخلص قشور الرمان و مستخلص الزنجبيل من خلال إضافتها كل على حدة إلى زيت النخيل المكـرر، و تخزينها مدة 5 أيام في الفرن في درجة حرارة 63 م، و مقارنتها بمضاد الأكسدة الاصـطناعي جاليـت البروبيل (gallate Propyl) . المستخلصات أعلاه تم الحصول عليها من خلال استخلاصـها باسـتعمال الإيثانول. أُضيفت هذه المستخلصات إلى زيت النخيـل بتركيـزين (ppm 100) و (ppm 200) . قـدرت الفعالية المضادة للأكسدة للمستخلصات الطبيعية و مضاد الأكسدة الإصطناعي جاليت البروبيـل و معاملـة الشاهد الخالية من مضاد الأكسدة ضمن الظروف الحرارية من خلال تقدير قيمة الحامض (AV) و قيمـة البيروكسيد (PV) و قيمة اليودي (IV) و معامل الإنكسار (RI) خلال 5 أيام من خزن زيت النخيـل فـي درجة الحرارة المذكورة أعلاه. كما قدرت الفعالية المضادة للأكسدة من خـلال دراسـة ثباتيـة الزيـت باستعمال طريقة الرانسميت. أظهرت المعاملات جميعها فعالية مضادة للأكسدة. لوحظ من نتائج التحليـل الإحصائي تفوق معاملة مستخلص قشور الرمان تفوقاً معنوياً (05.0<P) على معـاملات المستخلـصات الأخرى، في حين لم تختلف معنوياً عن معاملة جاليت البروبيل.
Some local natural sources of antioxidant such as orange peel extract (Citrus sinensis), pomegranate peel extract (Punica granatum) and ginger extract (Zingiber officinale L.) were evaluated during 5 days storage of refined palm oil at 63°C as compared to the synthetic antioxidant such as propyl gallate. The above extracts were obtained with ethanol and oil (palm oil). Those extracts were added to the oil at two different levels (100 ppm and 200 ppm). Antioxidant activity of natural extracts, synthetic antioxidant and the control treatment without antioxidant under thermal treatment (Schaal test) was assessed by measuring acid value (AV), peroxide value (PV), iodine value (IV) and refractive index (RI) during 6 days storage of refined palm oil at temperature mentioned above. Antioxidant activity also measured by studying the stability of oil by the use of rancimat method. All treatments exhibited antioxidant activity. Statistical analysis results were shown that the pomegranate peel extract treatment was significantly (P<0.05) superior than the orange peel extract and ginger extract treatments whereas, it was not significant difference about propyl gallate treatment.
References used
Alexander, P., Ritsuko, M., Miechal, S., Bat-Sheva, C., Fostik-Magyar, C., and Dubinsley, Z. (1998). Natural antioxidatnt activity in some microalgal spices. International Journal of Plant Science, 46, 169–176
Alexandra, B., Marie Elisabeth, C., Hubert, R., and Clendette, B. (1998). Antioxidant activity and phenolic composition of citrus peel and seed extract. Journal of Agricultural and Food Chemistry, 46, 2123–2129
A.O.C.S. (1993). Official methods of the American oil chemists society (4th ed.). Champaign, IL: American Oil Chemists Society
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Classified locality Yeasts have been culturing in plantology
department at the Faculty of Science-University of Damascus,
from genera of Pichia, Candida, Geotrichum, Rhodotorula, Phaffia
on solid Czhapek agar medium, and after incubated in appropr
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conditions their colonies showed evidence of different colors to
produce a variety of pigments. Then it cultured in liquid Czhapek
medium to increase biomass and the genera producing
endocellular pigment separated from the medium by filtration with
added ethanol on them and blasting cells by ultrasonic waves to
get a pigment, while the genera producing exocellular pigment is
separated about the liquid medium also by filtration but the solvent
was added to the medium containing the pigment.
Functional foods are similar to conventional food and demonstrate beneficial effects
beyond their nutritional value. These effects are attributed to the presence of functional
ingredients. Functional ingredients can either be found naturally in a c
ertain food or added
to it. There’s a number of functional food products available in the market. For example,
natural functional juices containing polyphenols. The aim of this study is to determine total
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mulberry juice, while the lowest was red grape juice. The best conditions for eliminating
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ferricyanide. The highest in phenolic content among the studied juices were the highest in
antioxidant activity. Thus a strong correlation was found between total phenolic content
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of roots and leaves of H. aureus were prepared at concentrations.
The aim of this study was to determine the
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Results showed that water extracts had antibacte
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All Gram positive bacteria showed sensitivity to all organic extracts, so they had antibacterial activity, while Gram negative bacteria showed resistance to chloroform extract except for the one of Klebsiella pneumoniae with an inhibition zone of 12 mm, and resistance for dichlormethan extract except for Pseudomonas aeruginosa with an inhibition zone of 15 mm. there was resistance for diethyl extract except for Serratia marcescens with an inhibition zone of 32 mm.
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