Extract of Phenolics From Pomegranate Peels

摘要

The effects of different solvents, temperature conditions, solvent-solid ratios and particle sizes on solid-solventextraction of the total phenolics, proanthocyanidins and flavonoids herein also referred to as antioxidant from pomegranatemarc peel (PMP) was studied. Water, methanol, ethanol, acetone, and ethyl acetate extraction efficiencies at extractiontimes of 0.17 to 10 min, extraction temperatures of 25 to 95°C, ratios of solvent/solid of 5:1 to 50:1 and particle sizes of10 to 40 mesh were evaluated. At 40 °C, solvent/solid ratio of 15:1, extraction time of 240 min and particle size of 40mesh, methanol gave the highest extract yield of the total phenolics (8.26%), followed by water (5.90%), ethanol (1.55%),acetone (0.37%), and ethyl acetate (0.18%), respectively. However, at an extraction temperature of 95°C, the total phenolicsextract yield with water was 11.15% for particle size of 40 mesh, solvent/solid ratio of 15:1, and extraction time of2 min. Despite the lowest extract yield at extraction temperature of 40 °C, solvent/solid ratio of 15:1, extraction time of240 min and particle size of 40 mesh, ethyl acetate extraction gave the highest content of the total phenolics (20.24%),proanthocyanidins (2.65%) and flavonoids (3.92%) in the extract. The DPPH antioxidant activity of extracts had a linearrelationship with the total phenolics content in the extracts (R2=0.9779). This study revealed that water extraction, whichhas the economic and safety merits, can be used as an environmentally friendly method for producing antioxidants fromthe PMP.