富含多酚和矿物质的咖啡替代品的抗氧化特性。

Antioxidant properties of coffee substitutes rich in polyphenols and minerals.

机构信息

Bialystok University of Technology, Department of Chemistry, Biology and Biotechnology, Wiejska 45E, 15-351 Bialystok, Poland.

出版信息

Food Chem. 2019 Apr 25;278:101-109. doi: 10.1016/j.foodchem.2018.11.057. Epub 2018 Nov 10.

DOI:10.1016/j.foodchem.2018.11.057

PMID:30583350

Abstract

The analysis of general content of polyphenols, minerals and antioxidant activity of infusions from selected coffee substitutes is presented. The obtained results showed that the coffee infusions prepared from acorns exhibit the highest radical scavenging capacities for DPPH (EC = 0.063-0.066 mg/mL), ABTS (EC = 0.021-0.029 mg/mL), OH(EC = 2.050-2.378 mg/mL) as well as the highest ability to Fe reduction (FRAP) (∼1.1 mmolFe/g). These coffee substitutes also contain the greatest values of polyphenols (45-50 mgGA/g). Analyzed coffee substitutes differ in both quality and quantity of polyphenols, but all tested coffees contain gallic and chlorogenic acids. The most of phenolic compounds was found in herbal-cereal coffee substitute. The quantitative results and PCA analysis indicated a good correlation between the antioxidant activity and total polyphenols, flavonoids and gallic acid content. Using the obtained data on the composition and antioxidant properties of extracts the cluster analysis (CA) was performed to distinguish similar or close types of coffee.

摘要

本文对几种咖啡代用品的多酚、矿物质和抗氧化活性浸提液的总含量进行了分析。研究结果表明，从橡实中提取的咖啡浸提液对 DPPH（EC = 0.063-0.066mg/mL）、ABTS（EC = 0.021-0.029mg/mL）和 OH（EC = 2.050-2.378mg/mL）自由基的清除能力最强，同时对铁的还原能力（FRAP）也最强（约 1.1mmolFe/g）。这些咖啡代用品还含有最高含量的多酚（45-50mgGA/g）。分析的咖啡代用品在多酚的质量和数量上存在差异，但所有测试的咖啡都含有没食子酸和绿原酸。在草本谷物咖啡代用品中发现了最多的酚类化合物。定量结果和 PCA 分析表明，抗氧化活性与总多酚、类黄酮和没食子酸含量之间存在良好的相关性。利用提取物的组成和抗氧化性能的相关数据，采用聚类分析（CA）对相似或相近类型的咖啡进行了区分。