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

Luis Mojica, Mark Berhow, Elvira Gonzalez de Mejia

Research output: Contribution to journalArticlepeer-review

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 (465.1 m/z), petunidin-3-O-glucoside (479.1 m/z) and malvidin-3-O-glucoside (493.1 m/z). A total of 32 mg 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 277 days. 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.

Original languageEnglish (US)
Pages (from-to)628-639
Number of pages12
JournalFood chemistry
Volume229
DOIs
StatePublished - Aug 15 2017

Keywords

  • Anthocyanins
  • Antidiabetes potential
  • Black bean coats
  • Extraction optimization
  • Natural pigments
  • ROS inhibition

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

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