Pal Chandra Bhushan T, Jadeja Girirajsinh C
Chemical Engineering Department, S. V. National Institute of Technology, Surat, Gujarat 395007 India.
J Food Sci Technol. 2019 Sep;56(9):4211-4223. doi: 10.1007/s13197-019-03891-7. Epub 2019 Jul 12.
Valorization of onion peel waste, considered to be a rich source of polyphenolic compounds, by employing green extraction techniques is the need of the hour. The aim of the present study was to optimize the microwave-assisted extraction of bioactive phenolic compounds from onion peel wastes employing ChCl:Urea:HO deep eutectic solvent. Microwave power (100-200-300 W), time (5-15-25 min) and liquid to solid ratio (40:1-50:1-60:1) were studied as the major parameters affecting the extraction efficiency. A Box-Behnken design was adopted including 17 experiments with five centre points. The optimum conditions determined were 100 W microwave power, 15.03 min irradiation time and 54.97 mL g liquid to solid ratio. Under the MAE optimized conditions, the recovery of TPC and FRAP were 80.45 (mg GAE g dw) and 636.18 (µmol AAE g dw), respectively. Morphology of onion peels before and after DES extraction were also studied to gain an insight in the effect of microwave irradiations on the biomass.
采用绿色提取技术将被视为富含多酚类化合物的洋葱皮废料加以增值利用是当务之急。本研究的目的是优化利用氯化胆碱:尿素:水的深层共熔溶剂从洋葱皮废料中微波辅助提取生物活性酚类化合物的工艺。研究了微波功率(100 - 200 - 300瓦)、时间(5 - 15 - 25分钟)和液固比(40:1 - 50:1 - 60:1)作为影响提取效率的主要参数。采用Box - Behnken设计,包括17个实验和5个中心点。确定的最佳条件为100瓦微波功率、15.03分钟辐照时间和54.97毫升/克液固比。在微波辅助提取优化条件下,总酚含量(TPC)和铁还原抗氧化能力(FRAP)的回收率分别为80.45(毫克没食子酸当量/克干重)和636.18(微摩尔抗坏血酸当量/克干重)。还研究了深层共熔溶剂提取前后洋葱皮的形态,以深入了解微波辐照对生物质的影响。