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Extraction and Determination of Polyphenols in Dry Olive Leaves using Ultrasound Apparatus

استخلاص و تقدير المركبات الفينولية في أوراق الزيتون الجافة باستخدام جهاز الموجات فوق الصوتية

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 Publication date 2018
  fields Chemistry
and research's language is العربية
 Created by Shamra Editor




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Total Polyphenol was studied in olive leaves collected from Lattakia area (AlQurdaha zone), where Phenolic compounds were extracted from dry Olive leaves by using two extraction methods: maceration and Ultrasonic Device. By the both two methods a study was carried out on the extraction solvent concentration effect where the extraction was done by using the mixture of Ethanol-Water with different percentages (60,70,80 %). As well, The extraction temperature effect was studied at the both methods at (20,30, 40°C); in addition to the study of the extraction time effect. At the method of Maceration Extraction, the total polyphenols amount was studied in dry olive leaves after extraction during different times (24,48,72 h). While at the Ultrasonic Extraction the times were (10,20,30 min). The study showed that the highest amount of phenolic compounds were existed in dry olive leaves which were extracted by Ultrasonic Waves with the concentration of the solvent ethanol-water 80%, temperature of 40°C, and with an extraction time of 20min.


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Research summary
تتناول هذه الدراسة استخلاص وتقدير المركبات الفينولية في أوراق الزيتون الجافة باستخدام جهاز الموجات فوق الصوتية وطريقة النقع. تم جمع أوراق الزيتون من منطقة القرداحة في اللاذقية، وتمت دراسة تأثير تركيز المذيب (إيثانول-ماء بنسب 60%، 70%، 80%)، درجة حرارة الاستخلاص (20، 30، 40 درجة مئوية)، وزمن الاستخلاص على كمية البولي فينولات المستخلصة. أظهرت النتائج أن أعلى كمية من المركبات الفينولية تم الحصول عليها باستخدام جهاز الموجات فوق الصوتية بتركيز مذيب 80%، درجة حرارة 40 درجة مئوية، وزمن استخلاص 20 دقيقة. تم مقارنة الطريقتين وأظهرت النتائج تفوق طريقة الموجات فوق الصوتية في استخلاص كمية أكبر من المركبات الفينولية مقارنة بطريقة النقع التقليدية. تشير الدراسة إلى أن أوراق الزيتون مصدر غني ورخيص لمضادات الأكسدة ويمكن استخدامها في الوقاية والعلاج من العديد من الأمراض.
Critical review
دراسة نقدية: تعتبر هذه الدراسة ذات أهمية كبيرة في مجال استخلاص المركبات الفينولية من النباتات، حيث تقدم طريقة فعالة واقتصادية باستخدام جهاز الموجات فوق الصوتية. ومع ذلك، يمكن توسيع نطاق الدراسة لتشمل أنواع أخرى من النباتات أو أجزاء مختلفة من شجرة الزيتون مثل الثمار أو الأغصان. كما يمكن دراسة تأثير عوامل أخرى مثل نوع المذيب المستخدم أو تأثير الضغط على عملية الاستخلاص. بالإضافة إلى ذلك، يمكن تحسين الدراسة من خلال تقديم تحليل اقتصادي مفصل لتكلفة الاستخلاص باستخدام الطريقتين المختلفتين.
Questions related to the research
  1. ما هي الطريقتان المستخدمتان لاستخلاص المركبات الفينولية في الدراسة؟

    الطريقتان المستخدمتان هما طريقة النقع وطريقة الاستخلاص باستخدام جهاز الموجات فوق الصوتية.

  2. ما هي أفضل شروط لاستخلاص أعلى كمية من المركبات الفينولية باستخدام جهاز الموجات فوق الصوتية؟

    أفضل شروط لاستخلاص أعلى كمية من المركبات الفينولية هي استخدام مذيب إيثانول-ماء بتركيز 80%، درجة حرارة 40 درجة مئوية، وزمن استخلاص 20 دقيقة.

  3. ما هي الفائدة العملية لاستخدام جهاز الموجات فوق الصوتية في الاستخلاص؟

    الفائدة العملية لاستخدام جهاز الموجات فوق الصوتية هي تقليل زمن الاستخلاص وتقليل استهلاك المذيبات العضوية، مما يجعله طريقة أكثر فعالية واقتصادية.

  4. كيف تم تحضير عينات أوراق الزيتون قبل عملية الاستخلاص؟

    تم جمع أوراق الزيتون، غسلها، تجفيفها في الظل، طحنها لتصبح مسحوق ناعم، ثم حفظها في الثلاجة بدرجة حرارة 4 درجات مئوية لحين الاستخدام.


References used
Ibrahim, E, H., Abdelgaleel, M,A., Salama, A. A., Metwalli, S, M. Chemical and Nutritional Evaluation of Olive Leaves and Selection the Optimum Conditions for Extraction their Phenolic Compounds, Agric. Res. Kafr El-Sheikh Univ, Egypt, 42 (1), 445-459, 2016
Pereira,A,P., Ferreira,I,C,F,R., Marcelino,F., Valentao,P., Andrade,P,B., Seabra,R., Estevinho,L., Bento,A., Pereira,J,A. Phenolic Compounds and Antimicrobial Activity of Olive (Olea Europaea L. Cv. Cobrançosa) Leaves. Molecules, Portugal, (12): 1153-1162, 2007
Herrero,M., Temirzoda,T,N., Segura-Carretero,A., Quirantes,R., Plaza,M., Ibañez,E. New Possibilities for the Valorization of Olive Oil By-Products. Journal of Chromatography A. 2011
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