Anti-oxidant and anti-bacterial effects of Diospyros kaki leaf extract in Vietnam

Thao Thi Xuan Tran, Ty Viet Pham, Luong Tuan Lam, Binh Tinh Hua, Ngoc Bich Nguyen, Bich Hang Do and Buu Gia Tran
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Thao Thi Xuan Tran: Ton Duc Thang University, Ho Chi Minh City, Vietnam
Ty Viet Pham: University of Education, Hue University, Hue City, Vietnam
Luong Tuan Lam: Ton Duc Thang University, Ho Chi Minh City, Vietnam
Binh Tinh Hua: Ton Duc Thang University, Ho Chi Minh City, Vietnam
Ngoc Bich Nguyen: Ton Duc Thang University, Ho Chi Minh City, Vietnam
Bich Hang Do: Ton Duc Thang University, Ho Chi Minh City, Vietnam
Buu Gia Tran: Ton Duc Thang University, Ho Chi Minh City, Vietnam

HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - ENGINEERING AND TECHNOLOGY, 2025, vol. 15, issue 1, 15-27

Abstract: Diospyros kaki is a famous commercial plant with its edible fruit (persimmon) and is widely used as a traditional remedy in Vietnam. However, the anti-oxidant and anti-bacterial effects against gastrointestinal microbes of the D. kaki leaf extract have not been elucidated yet. In this study, the methanol extract from D. kaki leaves contained some chemical groups, such as tannins, flavonoids, phenolic compounds, alkaloids, and saponins, mainly it was rich in polyphenols and flavonoids (528.11 ± 12.96 mg GAE/g and 44.49 ± 6.77 mg QE/g, respectively). The extract exhibited a strong anti-oxidant ability (DPPH scavenging activity of about 91.83 ± 1.02% and total anti-oxidant capacity of approximately 110.58 ± 2.65 mg AAE/g). Furthermore, the anti-bacterial activity of the extract against some gastrointestinal bacteria, including Staphylococcus aureus, Enterococcus durans, Enterococcus faecium, and Yersinia enterocolitica, has been reported for the first time (the zone of inhibition ranging from 14.17 - 24.67mm). MIC of the extract was 0.6125 - 1.25 mg/mL, and MBC was 2.5 - 5 mg/mL, which implied the extract exerted a bactericidal effect. These findings suggest D. kaki leaf extract is a promising source of extracting bioactive compounds, such as anti-oxidant and anti-microbial agents, and a potential medicine for the treatment of gastrointestinal infections.

Keywords: anti-bacterial effect; anti-oxidant activity; Diospyros kaki; ethno-pharmacology; gastrointestinal bacteria (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:bjw:techen:v:15:y:2025:i:1:p:15-27

DOI: 10.46223/HCMCOUJS.tech.en.15.1.3502.2025

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