Abstract Title:

Inhibitory Effect of Garlic, Purple Onion, and White Onion on Key Enzymes Linked with Type 2 Diabetes and Hypertension.

Abstract Source:

J Diet Suppl. 2018 Mar 9:1-14. Epub 2018 Mar 9. PMID: 29522359

Abstract Author(s):

Ganiyu Oboh, Adedayo O Ademiluyi, Odunayo M Agunloye, Ayokunle Olubode Ademosun, Bolaji Grace Ogunsakin

Article Affiliation:

Ganiyu Oboh


Spices are used in soup preparation in many homes and serve as ingredients in the preparation of several traditional delicacies endowed with natural antioxidants such as polyphenols. The aim of this study is to evaluate the effect of aqueous extract of garlic, white onion, and purple onion on angiotensin-converting enzyme,α-amylase, and α-glucosidase activity in vitro and determine their antioxidant properties via various antioxidant assays such as OH, Fechelation, and 2, 2'-azino-bis 3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical-scavenging assays. The results reveal that aqueous extract of garlic, purple onion, and white onion inhibited angiotensin-converting enzyme,α-amylase, and α-glucosidase in a concentration-dependent manner (0-4 mg/ml). However, purple onion (IC= 0.59 mg/ml) had higher inhibitory effect on angiotensin-converting enzyme than white onion (IC= 0.66 mg/ml) and purple onion (IC= 0.96 mg/ml). Furthermore, white onion had significantly (p<.05) stronger inhibitory effect onα-amylase (IC= 3.93 mg/mL) than garlic (IC= 8.19 mg/ml) and purple onion (IC= 8.27 mg/ml). Conversely, garlic (IC= 4.50 mg/ml) had no significantly higher inhibitory effect on α-glucosidase activity than white onion and purple onion. In addition, the aqueous extracts were able to scavenge 2,2- diphenyl-1-picrylhydrazyl (DPPH) free radical and reduce Feto Fein a dose-dependent manner. Therefore, a possible mechanism by which garlic, white onion, and purple onion exert antidiabetes and antihypertensive properties could be through the inhibitory effect on ACE,α-amylase, and α-glucosidase coupled with their ability to prevent lipid peroxidation in the pancreas and heart, which justify their strong antioxidant properties.

Print Options

Sayer Ji
Founder of GreenMedInfo.com

Subscribe to our informative Newsletter & receive The Dark Side of Wheat Ebook

Our newsletter serves 500,000 with essential news, research & healthy tips, daily.

Download Now

The Dark Side of Wheat

This website is for information purposes only. By providing the information contained herein we are not diagnosing, treating, curing, mitigating, or preventing any type of disease or medical condition. Before beginning any type of natural, integrative or conventional treatment regimen, it is advisable to seek the advice of a licensed healthcare professional.

© Copyright 2008-2023 GreenMedInfo.com, Journal Articles copyright of original owners, MeSH copyright NLM.