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Phenolic-rich extracts from selected tropical underutilized legumes inhibit α-amylase, α-glucosidase, and angiotensin I converting enzyme in vitro.
J Basic Clin Physiol Pharmacol. 2012 Jan 19; 23(1):17-25.JB

Abstract

BACKGROUND

In this study, interaction of free and bound phenolic extracts from selected tropical underutilized legumes (a popular folklore for the management of diabetes and hypertension) with key enzymes linked to type 2 diabetes (α-glucosidase and α-amylase) and hypertension (angiotensin I converting enzyme, ACE) was assessed.

METHODS

The free phenolic extracts of the soybean were obtained by extracting powdered legume seeds with 80% acetone, whereas the residue was subjected to alkaline and acid hydrolysis before extraction with ethyl acetate to obtain the bound extracts. Thereafter, enzyme (α-amylase, α-glucosidase, and ACE) inhibitory studies and antioxidant capacity of the extracts were investigated.

RESULTS

The free and bound phenolic extracts inhibited α-amylase, α-glucosidase, and ACE activities in a dose-dependent manner. However, the free phenolic extracts of all the legumes were stronger inhibitors of α-glucosidase than their corresponding bound phenolic extracts. In addition, the free phenolic extracts (except melon) exhibited stronger ACE inhibition than their corresponding bound phenolic extracts. All the phenolic extracts significantly (p<0.05) inhibited Fe2+-induced oxidative stress in the pancreas (in vitro) and exhibited strong antioxidant activities.

CONCLUSIONS

The inhibition of the α-amylase, α-glucosidase, ACE, and oxidative stress by the phenolic extracts could be a part of the mechanism through which these underutilized legumes manage/prevent type 2 diabetes and hypertension. However, as revealed by this study, bambara groundnut with the best enzyme inhibitory potentials coupled with strong antioxidant properties ranked highest, whereas melon seed ranked least.

Authors+Show Affiliations

Department of Biochemistry, Federal University of Technology, Akure, Nigeria. goboh2001@yahoo.comNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22865445

Citation

Ademiluyi, Adedayo O., and Ganiyu Oboh. "Phenolic-rich Extracts From Selected Tropical Underutilized Legumes Inhibit Α-amylase, Α-glucosidase, and Angiotensin I Converting Enzyme in Vitro." Journal of Basic and Clinical Physiology and Pharmacology, vol. 23, no. 1, 2012, pp. 17-25.
Ademiluyi AO, Oboh G. Phenolic-rich extracts from selected tropical underutilized legumes inhibit α-amylase, α-glucosidase, and angiotensin I converting enzyme in vitro. J Basic Clin Physiol Pharmacol. 2012;23(1):17-25.
Ademiluyi, A. O., & Oboh, G. (2012). Phenolic-rich extracts from selected tropical underutilized legumes inhibit α-amylase, α-glucosidase, and angiotensin I converting enzyme in vitro. Journal of Basic and Clinical Physiology and Pharmacology, 23(1), 17-25. https://doi.org/10.1515/jbcpp-2011-0005
Ademiluyi AO, Oboh G. Phenolic-rich Extracts From Selected Tropical Underutilized Legumes Inhibit Α-amylase, Α-glucosidase, and Angiotensin I Converting Enzyme in Vitro. J Basic Clin Physiol Pharmacol. 2012 Jan 19;23(1):17-25. PubMed PMID: 22865445.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Phenolic-rich extracts from selected tropical underutilized legumes inhibit α-amylase, α-glucosidase, and angiotensin I converting enzyme in vitro. AU - Ademiluyi,Adedayo O, AU - Oboh,Ganiyu, Y1 - 2012/01/19/ PY - 2011/07/26/received PY - 2011/12/02/accepted PY - 2012/8/7/entrez PY - 2012/8/7/pubmed PY - 2012/9/5/medline SP - 17 EP - 25 JF - Journal of basic and clinical physiology and pharmacology JO - J Basic Clin Physiol Pharmacol VL - 23 IS - 1 N2 - BACKGROUND: In this study, interaction of free and bound phenolic extracts from selected tropical underutilized legumes (a popular folklore for the management of diabetes and hypertension) with key enzymes linked to type 2 diabetes (α-glucosidase and α-amylase) and hypertension (angiotensin I converting enzyme, ACE) was assessed. METHODS: The free phenolic extracts of the soybean were obtained by extracting powdered legume seeds with 80% acetone, whereas the residue was subjected to alkaline and acid hydrolysis before extraction with ethyl acetate to obtain the bound extracts. Thereafter, enzyme (α-amylase, α-glucosidase, and ACE) inhibitory studies and antioxidant capacity of the extracts were investigated. RESULTS: The free and bound phenolic extracts inhibited α-amylase, α-glucosidase, and ACE activities in a dose-dependent manner. However, the free phenolic extracts of all the legumes were stronger inhibitors of α-glucosidase than their corresponding bound phenolic extracts. In addition, the free phenolic extracts (except melon) exhibited stronger ACE inhibition than their corresponding bound phenolic extracts. All the phenolic extracts significantly (p<0.05) inhibited Fe2+-induced oxidative stress in the pancreas (in vitro) and exhibited strong antioxidant activities. CONCLUSIONS: The inhibition of the α-amylase, α-glucosidase, ACE, and oxidative stress by the phenolic extracts could be a part of the mechanism through which these underutilized legumes manage/prevent type 2 diabetes and hypertension. However, as revealed by this study, bambara groundnut with the best enzyme inhibitory potentials coupled with strong antioxidant properties ranked highest, whereas melon seed ranked least. SN - 0792-6855 UR - https://www.unboundmedicine.com/medline/citation/22865445/Phenolic_rich_extracts_from_selected_tropical_underutilized_legumes_inhibit_α_amylase_α_glucosidase_and_angiotensin_I_converting_enzyme_in_vitro_ L2 - https://www.degruyter.com/document/doi/10.1515/jbcpp-2011-0005 DB - PRIME DP - Unbound Medicine ER -