In Vitro Assessment Methods for Antidiabetic Peptides from Legumes: A Review

Area of Science:

• Biochemistry
• Nutritional Science
• Food Science

Background:

• Legumes are a significant source of plant-based protein, contributing substantially to the global human protein supply.
• Bioactive peptides derived from food sources, particularly legumes, have demonstrated potential in regulating starch digestion and glucose absorption.
• These peptides offer a promising avenue for developing functional foods and therapeutic strategies for diabetes management.

Purpose of the Study:

• To provide a comprehensive review of recent in vitro studies on leguminous antidiabetic peptides.
• To focus on the inhibitory activities of these peptides against alpha-amylase, alpha-glucosidase, and dipeptidyl peptidase-IV (DPP-IV).
• To highlight the impact of various methodologies on peptide release and activity assessment.

Main Methods:

• Review of in vitro studies on leguminous antidiabetic peptides.
• Analysis of diverse methods in sample preparation (fermentation, germination, pre-cooking), protein extraction (alkaline, isoelectric precipitation, buffer, water), and protein hydrolysis (enzyme types, ratios, pH, time).
• Evaluation of enzyme inhibitory assays, including control types, concentrations, and units of activity; peptide identification via HPLC/MS; and bioactivity prediction/computational modeling.

Main Results:

• Methodological variations in sample preparation, extraction, hydrolysis, and assay conditions complicate direct comparisons of inhibitory activities across different legume studies.
• High-Performance Liquid Chromatography coupled with Mass Spectrometry (HPLC/MS) was employed for peptide sequence identification.
• Computational modeling and enzyme kinetic studies elucidated the specific interactions between inhibitor peptides and target enzymes (alpha-amylase, alpha-glucosidase, DPP-IV), determining inhibition types.

Conclusions:

• Leguminous antidiabetic peptides exhibit significant potential, targeting key enzymes in glucose metabolism.
• Standardization of methodologies is crucial for accurate comparison and effective utilization of these peptides.
• Further research utilizing advanced analytical and computational techniques can optimize the development of legume-derived antidiabetic agents.