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Abstract Title:

Black bean anthocyanin-rich extracts as food colorants: Physicochemical stability and antidiabetes potential.

Abstract Source:

Food Chem. 2017 Aug 15 ;229:628-639. Epub 2017 Feb 27. PMID: 28372224

Abstract Author(s):

Luis Mojica, Mark Berhow, Elvira Gonzalez de Mejia

Article Affiliation:

Luis Mojica

Abstract:

Black beans contain anthocyanins that could be used as colorants in foods with associated health benefits. The objective was to optimize anthocyanins extraction from black bean coats and evaluate their physicochemical stability and antidiabetes potential. Optimal extraction conditions were 24% ethanol, 1:40 solid-to-liquid ratio and 29°C (P<0.0001). Three anthocyanins were identified by MS ions, delphinidin-3-O-glucoside (465.1m/z), petunidin-3-O-glucoside (479.1m/z) and malvidin-3-O-glucoside (493.1m/z). A total of 32mg of anthocyanins were quantified per gram of dry extract. Bean anthocyanins were stable at pH 2.5 and low-temperature 4°C (89.6%), with an extrapolated half-life of 277days. Anthocyanin-rich extracts inhibited α-glucosidase (37.8%), α-amylase (35.6%), dipeptidyl peptidase-IV (34.4%), reactive oxygen species (81.6%), and decreased glucose uptake. Black bean coats are a good source of anthocyanins and other phenolics with the potential to be used as natural-source food colorants with exceptional antidiabetes potential.

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Sayer Ji
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