从超大尺寸猕猴桃中可持续提取抗氧化剂。

Sustainable extraction of antioxidants from out-of-caliber kiwifruits.

机构信息

Université Cote d'Azur, CNRS, Institut de Chimie, UMR 7272, parc Valrose, 28 avenue valrose, 06108 Nice, France; CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

出版信息

Food Chem. 2023 Feb 1;401:133992. doi: 10.1016/j.foodchem.2022.133992. Epub 2022 Aug 22.

DOI:10.1016/j.foodchem.2022.133992

PMID:36095996

Abstract

Valorisation of discarded kiwifruits is proposed by extracting bioactive compounds using sustainable solvents namely deep eutectic solvents (DES). A screening of fifteen DES and several hydrogen bonding donor solvents was carried out. Extraction efficiency was measured in terms of antioxidant activity using DPPH and FRAP tests. The influence of solvents characteristics in particular DES structure, presence of ethanol or water, and pH of DES/water mixture on the antioxidant properties of the extracts was studied. Results show that kiwi peels extracts obtained with DES based on carboxylic acids exhibit enhanced antioxidant activity compared to conventional solvents and alcohol-based DES with a maximum DPPH scavenging activity of 42.0 mg TE/g DW. Glycerol or ethylene glycol are also efficient at extracting antioxidant compounds with DPPH scavenging activity of 33.1 and 36.7 mg TE/g DW. Finally, a chemical analysis of extracts using HPTLC revealed that most active compounds extracted are polyphenolic compounds, presumably tannins.

摘要

提出了利用深共晶溶剂（DES）等可持续溶剂从废弃猕猴桃中提取生物活性化合物来实现其再利用。对 15 种 DES 和几种氢键供体溶剂进行了筛选。使用 DPPH 和 FRAP 试验测定了抗氧化活性的提取效率。研究了溶剂特性，特别是 DES 结构、乙醇或水的存在以及 DES/水混合物的 pH 值对提取物抗氧化性能的影响。结果表明，与传统溶剂和醇基 DES 相比，基于羧酸的 DES 提取的猕猴桃皮提取物具有更高的抗氧化活性，其 DPPH 清除活性最高可达 42.0mg TE/g DW。甘油或乙二醇也能有效地提取具有 33.1 和 36.7mg TE/g DW DPPH 清除活性的抗氧化化合物。最后，使用 HPTLC 对提取物进行的化学分析表明，提取的最有效化合物是多酚类化合物，可能是单宁。