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Extraction of phenolic compounds from (Hops,grape seeds ) and study its antioxidant activity

المركبات الفينولية من (حشيشة الدينار و بذور العنب) و دراسة استخلاص فعاليتها بوصفها مضادات أكسدة

1492   2   9   0.0 ( 0 )
 Publication date 2017
  fields Chemistry
and research's language is العربية
 Created by Shamra Editor




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The phenolic compounds were extracted from leaves and flowers of Hops and grape seeds from local production by soaking with different solvents (Methanol-ethanol-alcohol and water mixture) . The polyphenols content in the methanol extracts for 100 g dry matter was 6.31 g for the grape seeds, 2.08 g for Hops leaves and 0.6 g for Hops flowers. Methanol extracts were characterized by an antioxidant activity that appeared by their ability to Reduce ions ferriques Fe+3, at a concentration of 2500 ppm, the Reducing Power was 96.45% , 67.56% for the grape seeds and Hops leaves, respectively. The methanolic extracts of grape seeds and Hops leaves at 80 ppm showed activity in scavenge free radical DPPH. was 82.04% and 40.92% respectively. The methanolic extracts of grape seeds and Hops leaves at 250 ppm gave the ability to protect linoleic acid from the oxidation process of 78.98% and 48.41%, respectively. The antioxidant activity values of the extracts were compared with standard samples of ascorbic acid and BHT.


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Research summary
تناولت هذه الدراسة استخلاص المركبات الفينولية من أوراق وأزهار حشيشة الدينار وبذور العنب باستخدام مذيبات مختلفة مثل الميثانول والإيثانول والماء. أظهرت النتائج أن محتوى البوليفينولات في المستخلصات الميثانولية كان الأعلى، حيث بلغ 6.31 غرام لكل 100 غرام من المادة الجافة لبذور العنب، و2.08 غرام لأوراق حشيشة الدينار، و0.6 غرام لأزهارها. تميزت المستخلصات الميثانولية بفعالية مضادة للأكسدة، حيث أظهرت قدرة عالية على إرجاع شوارد الحديد الثلاثي وتقليل الجذور الحرة. عند تركيز 2500 جزء في المليون، كانت القدرة الإرجاعية 96.45% لبذور العنب و67.56% لأوراق حشيشة الدينار. كما أظهرت المستخلصات فعالية في حماية حمض اللينوليك من الأكسدة بنسبة 78.98% و48.41% على التوالي. تمت مقارنة هذه الفعالية مع عينات قياسية من حمض الأسكوربيك وBHT، وأظهرت النتائج أن المستخلصات الطبيعية كانت فعالة بشكل ملحوظ. توصي الدراسة باستخدام هذه المستخلصات في المجالات الصحية والطبية كبديل آمن وفعال لمضادات الأكسدة الصناعية.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال البحث عن مضادات الأكسدة الطبيعية، حيث تقدم بديلاً آمناً وفعالاً للمركبات الصناعية التي قد تكون لها آثار جانبية. ومع ذلك، يمكن توجيه بعض الانتقادات البناءة للدراسة. أولاً، لم يتم التطرق بشكل كافٍ إلى تأثيرات المذيبات المختلفة على كفاءة الاستخلاص، مما قد يؤثر على النتائج النهائية. ثانياً، كان من الممكن توسيع نطاق الدراسة ليشمل أنواعاً أخرى من النباتات لزيادة شمولية النتائج. ثالثاً، لم يتم تقديم تحليل اقتصادي لاستخدام هذه المستخلصات في التطبيقات الصناعية، وهو جانب مهم للنظر فيه عند التفكير في استبدال المركبات الصناعية بمركبات طبيعية. على الرغم من هذه النقاط، تبقى الدراسة إضافة قيمة للبحث العلمي في مجال مضادات الأكسدة الطبيعية.
Questions related to the research
  1. ما هي المركبات الفينولية التي تم استخلاصها في هذه الدراسة؟

    تم استخلاص المركبات الفينولية من أوراق وأزهار حشيشة الدينار وبذور العنب باستخدام مذيبات مختلفة مثل الميثانول والإيثانول والماء.

  2. ما هي الفعالية المضادة للأكسدة للمستخلصات الميثانولية لبذور العنب؟

    أظهرت المستخلصات الميثانولية لبذور العنب فعالية مضادة للأكسدة بنسبة 96.45% في إرجاع شوارد الحديد الثلاثي و82.04% في التقاط الجذور الحرة DPPH عند تركيز 80 جزء في المليون.

  3. كيف تمت مقارنة فعالية المستخلصات مع العينات القياسية؟

    تمت مقارنة فعالية المستخلصات مع عينات قياسية من حمض الأسكوربيك وBHT، وأظهرت النتائج أن المستخلصات الطبيعية كانت فعالة بشكل ملحوظ.

  4. ما هي التوصيات التي قدمتها الدراسة؟

    توصي الدراسة باستخدام مستخلصات بذور العنب وحشيشة الدينار في المجالات الصحية والطبية كبديل آمن وفعال لمضادات الأكسدة الصناعية، والبحث عن منتجات نباتية أخرى يمكن الاستفادة منها في هذا المجال.


References used
YILMAZ, Y; TOLEDO, R. Health aspects of functional grape seeds constituents. Trends in Food Science & Technology,2004.15(9): 422 – 433
PANICHAYUPAKARANANT .P ; KAEWSUSWAN. S. Bioassay-guided isolation of the antioxidant constituent from Cassia alata, J Sci. Technol., 2004.26 (1): 103-107
LEONTOWICZ,H;GORINSTEIN,S; LOJEK,A; LEONTOWICZ,M; SOLIVAFORTUNY,R;PARK,YS;JUNG,ST;TRAKHTENBERG.S;MARTINBELLOS,O, O.Comparative content of some bioactive compounds in apples, peaches,and pears and their influence on lipids and antioxidant capacity hn rats, J Nutr Biochem.2002,13(10):603- 610
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