Abstract
Characterized by uncontrolled, long-term high blood sugar levels, diabetes mellitus affects ever increasing numbers of people worldwide. Type 2 diabetes is the most common, accounting for 95% of reported cases. The main objective of this article was to evaluate the in vitro antidiabetic effects of hydrolysates from Lima bean (Phaseolus lunatus L.) proteins. The hydrolysates were produced with either the Alcalase®-Flavourzyme® (AF) or pepsin-pancreatin (PP) sequential systems and peptide fractions (F > 10, F5-10, F3-5, 1–3 and < 1 kDa) isolated from them. Assays of in vitro inhibitory activity against the enzymes α-amylase, α-glucosidase, and dipeptidyl peptidase IV (DPP-IV) were done for all the hydrolysates and peptide fractions. Degree of hydrolysis (DH) was highest in the AF hydrolysates. Protein hydrolysates (PH) or ultrafiltered peptide fractions (UFPF) test concentrations (mg protein mL−1) were in α-amylase, PP (100 mg mL−1) and AF (50 mg mL−1); α-glycosidase, PP (200 mg mL−1) and AF (10 mg mL−1); and DPP-IV, PP and AF (10 mg mL−1). Among the AF products, inhibitory activities were highest in the F > 10 kDa fraction against α-amylase (IC50 = 54.61 ± 1.76 mg protein mL−1), the F5-10 kDa (IC50 = 124.14 ± 3.05) against α-glucosidase and the F5-10 kDa (IC50 = 1.93 ± 0.20) against DPP-IV. For the PP products, inhibitory activities were highest in the F < 1 kDa (IC50 = 55.79 ± 1.06). None of the highly inhibitory hydrolysates or peptide fractions exhibited cytotoxicity in vitro versus Vero cells. These fractions are potential ingredients for inclusion in functional foods aimed at controlling type 2 diabetes.
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The authors thank the Consejo Nacional de Ciencia y Tecnología (CONACYT-México) and Red Temática de Farmoquímicos for their Project support to this publication. CONACYT is acknowledged for providing the MSc scholarship for the K. Jiménez.
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EC-P: Conceptualization, Formal analysis and investigation; Writing—original draft preparation. KJ-M: Formal analysis and investigation. AC-R: Methodology: Writing—review and editing. LC-G: Conceptualization, Supervision. DB-A: Conceptualization, Formal analysis and investigation, Writing—review and editing, Supervision. Additional declarations for articles in life science journals that report the results of studies involving humans and/or animals.
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Castañeda-Pérez, E., Jiménez-Morales, K., Castellanos-Ruelas, A. et al. Antidiabetic Potential of Protein Hydrolysates and Peptide Fractions from Lima Bean (Phaseolus lunatus L): An In Vitro Study. Int J Pept Res Ther 27, 1979–1988 (2021). https://doi.org/10.1007/s10989-021-10226-8
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DOI: https://doi.org/10.1007/s10989-021-10226-8