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
phenolic content and antioxidant activity in some local functional juices. Total phenolic
content was determined according to Folin- Ciocalteu method. The highest in content was
mulberry juice, while the lowest was red grape juice. The best conditions for eliminating
ascorbic acid were also determined which were heating for
30 min at 75°C. Antioxidant activity was subsequently determined using potassium
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
and antioxidant activity.
This study was investigated at the laboratories of Horticultural department,
Faculty of Agriculture, Damascus University to measure the changes in
oxidative and antioxidative parameters during tomato fruit growth. Hydrogen
peroxide (H2O2) and lipi
d peroxidation (MDA) contents were analysed as
indicators of oxidative processes. Results showed that H2O2 content decreased
during fruit growth phase and slightly increased during ripening, meanwhile
MDA content was found to increase only at the end of fruit ripening. The
activities of antioxidant enzymes (SOD, APX, CAT) were modified during fruit
growth. Activities of SOD, APX increased during fruit growth phase,
meanwhile CAT activity increased during fruit maturation. The level of
ascorbate increased during fruit growth. These changes in antioxidant
metabolites and enzymes establish that the antioxidant system plays an
important role in the both phases of tomato fruit growth.
Four varieties of grape raisins where made in traditional way and
investigated for their chemical composition, mineral elements and total
antioxidanst capacity. Results reveals that there were significant differences in
the average percentage of m
oisture and carbohydrate between varieties,
whereas the protein, fat and ashes percentages were not significant. Results of
minerals analysis showed that blue raisins had the highest amount of Calcium,
phosphorous and potassium with a level of 66 mg, 193 mg and 989 mg in 100 g
raisins respectively. In addition, the total polyphenol contents by Folin-
Ciocalteau assay were higher in blue (257 mg) and red raisins (213mg) when
compared to the others varieties and vitamin C was 45mg/100g and 34 mg/100g
in blue and red raisins respectively. The antioxidant activity of raisins was
assessed by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay.
The amount of raisins needed to scavenge 50% of DPPH radical (EC50) was
similar for all varieties ranging from about 4.18 mg to 6.41 mg. Total
antioxidants capacity were in descending order blue >red > white > green
raisins. Therefore, the consumption of raisins is considered to contribute the
intake of antioxidants and minerals in Syrian diet .
This paper describes a study of the influence of extraction system
(centrifugation and pressure system) on the chemical composition and sensory
quality of Dan virgin olive oils produced in Syria. Analysis of the effect of the
extraction system on
the values of analytical determination revealed
statistically significant differences (P≤0.05) in a few parameters only, mainly in
antioxidant content and oxidative stability. The results appear to confirm the
influence of the extraction system on the quality of Dan virgin olive oils.
نفذت هذه الرسالة خلال موسم قطاف الزيتون 2009/2010 على صنف الزيتون الصوراني المزروع في ادلب وتم اختيار موقع واحد يصم 120 شجرة متجانسة لعمر حوالي 35 سنة .
نفذ هذا البحث في قسم علوم الاغذية - كلية الزراعة بجامعة دمشق هدف البحث إل دراسة تاثير طرائق التجفيف وتاثير المعاملات الأولية في بعض المؤشرات الكيمائيةوبعض مضادات الاكسدة لشرائح التفاح الطازجة والمجففة
حفظت ثمار العناب بطريقة التجميد والتجفيف الطبيعي لمدة (0-3-9-12 )شهرا وقورنت التغيرات في فيتامين C والفينولات الكلية والنشاط المضاد للاكسدة
تم في هذا البحث تقدير كمية الفينولات الكلية والفلافونيدات وقياس النشاط المضاد للأكسدة للمستخلص المائي والكحولي في أوراق الزعتر البري والأجزاء الهوائية للحرمل والنجمة والفراسيون والشيح وثمار الزعرور الاروني والبطم الأطلسي
نفذ البحث خلال الفترة 2013-2016 م في كلية الزراعة بجامعة دمشق , بهدف دراسة تأثير المعاملة ببعض المواد الكيميائية والطبيعية ( 1- ميثيل سكلو بروبان , ونتروبروسيد الصوديوم , الشيتوزان , وأمينوفينل علايسين , والميثيل جاسمونات , وفيتامين E ) في القدرة الت
خزينية لثمار البندورة ( الهجين Tala ) وصفاتها البيوكيميائية ( نسبة المواد الصلبة الذائبة TSS ونسبة الحموضة القاتلة للمعايرة TA ) والفيزيائية ( الصلابة ونسبة الفقد بالوزن والفقد المطلق ومؤشرات اللون ) ومعايير الأكسدة ومضادات الأكسدة .
