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Open AccessArticle

Inhibitory Activities of Polyphenolic Extracts of Bangladeshi Vegetables against α-Amylase, α-Glucosidase, Pancreatic Lipase, Renin, and Angiotensin-Converting Enzyme

1
Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
2
Institute of Nutrition and Food Sciences, University of Dhaka, Nilkhet Rd, Dhaka 1000, Bangladesh
3
Natural Resources Management Division, Bangladesh Agricultural Research Council, Dhaka 1215, Bangladesh
4
Natural Resources Institute, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
5
The Richardson Centre for Functional Foods and Nutraceuticals, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
*
Author to whom correspondence should be addressed.
Foods 2020, 9(7), 844; https://doi.org/10.3390/foods9070844
Received: 19 May 2020 / Revised: 6 June 2020 / Accepted: 10 June 2020 / Published: 29 June 2020
The aim of the study was to determine the in vitro enzyme inhibition activities of aqueous polyphenolic extracts of nine popular Bangladeshi vegetables, namely ash gourd, bitter gourd, brinjal, Indian spinach, kangkong, okra, ridge gourd, snake gourd, and stem amaranth. Polyphenolic glycosides were the major compounds present in the extracts. Inhibition of α-amylase (up to 100% at 1 mg/mL) was stronger than α-glucosidase inhibition (up to 70.78% at 10 mg/mL). The Indian spinach extract was the strongest inhibitor of pancreatic lipase activity (IC50 = 276.77 µg/mL), which was significantly better than that of orlistat (381.16 µg/mL), a drug. Ash gourd (76.51%), brinjal (72.48%), and snake gourd (66.82%) extracts were the most effective inhibitors of angiotensin-converting enzyme (ACE), an enzyme whose excessive activities have been associated with hypertension. Brinjal also had a significantly higher renin-inhibitory activity than the other vegetable extracts. We conclude that the vegetable extracts may have the ability to reduce enzyme activities that have been associated with hyperglycemia, hyperlipidemia, and hypertension. View Full-Text
Keywords: Bangladesh; vegetables; polyphenols; amylase; glucosidase; renin; angiotensin-converting enzyme; lipase; mass spectrometry Bangladesh; vegetables; polyphenols; amylase; glucosidase; renin; angiotensin-converting enzyme; lipase; mass spectrometry
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Sultana, R.; Alashi, A.M.; Islam, K.; Saifullah, M.; Haque, C.E.; Aluko, R.E. Inhibitory Activities of Polyphenolic Extracts of Bangladeshi Vegetables against α-Amylase, α-Glucosidase, Pancreatic Lipase, Renin, and Angiotensin-Converting Enzyme . Foods 2020, 9, 844.

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