Extraction of Valuable Compounds by Microwave Assisted Extraction of Pomegranate Peel
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https://doi.org/10.5281/zenodo.14970199Keywords:
Ellagic acid, pomegranate peel, phenolic component, soxhlet extractionAbstract
The aim of this study was to investigate the effects of extraction parameters on the yield of ellagic acid (EA), one of the valuable chemicals, from pomegranate peel wastes obtained during pomegranate juice production from Hicaz pomegranate (Punica granatum L., cv. Hicaznar) in Turkey. In the study, the highest yield of ellagic acid was obtained with solvent/sample ratio: 20/1, microwave power: 140 W, time: 35 min, methanol content: 80% and particle size: 0.100 mm-0.250 mm. Under these conditions, ellagic acid was determined as 2.148 mg g-1 peel, total phenolic component as 197.02 mg gallic acid equivalent GAE g-1 and antioxidant activity as 0.113 mM Trolox equivalent. When 80% ethanol was used under the same conditions, 1.843 mg EA g-1 peel, 203.79 mg GAE g-1 total phenolic content and 0.135 mM Trolox equivalent antioxidant activity were determined. Soxhlet extraction was carried out using 80% ethanol: 20% water as solvent, 20/1 solvent/sample ratio, 7.5 h extraction time and 70 ⁰C temperature. The presence of 2.154 mg g-1 EA was detected in the extract obtained under these conditions and the total phenolic content was 219.37 mg GAE g-1 and antioxidant activity was 0.131 mM Trolox equivalent. Compared to microwave assisted extraction, the yield of ellagic acid was high but very close, while the total phenolic component and antioxidant activity values were lower in soxhlet extraction.
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