Ochratoxin A Reduction Ability of Biocontrol Agent Bacillus Subtilis Isolated from Korean Traditional Fermented Food Kimchi

Overview

Journal Sci Rep

Specialty Science

Date 2018 May 26

PMID 29795296

Citations 6

Authors

Shruti Shukla

Jung Hyun Park

Soo Hyun Chung

Myunghee Kim

Affiliations

Soon will be listed here.

Abstract

In the present study, a new biocontrol strain, Bacillus subtilis KU-153, was isolated from the Korean traditional fermented food Kimchi and evaluated for its ability to reduce the ochratoxin A (OTA) content in culture medium. A 16 S rRNA gene sequencing analysis revealed the identity of newly isolated strain KU-153 as B. subtilis. The growth kinetic study of B. subtilis KU-153, in terms of the OTA reduction in culture medium, confirmed its biocontrol efficacy. To verify its ability to reduce the OTA content in culture medium, bacterial extracts (intracellular and extracellular) of B. subtilis were separated and compared with whole B. subtilis cells (viable and heat-killed). No reduction in the OTA content was observed in culture medium with extracellular and intracellular extracts, while viable and heat-killed cells of B. subtilis showed significant levels (p < 0.05) of OTA reduction in culture medium. Interestingly, B. subtilis heat-treated cells showed a higher OTA reduction (45%) than viable cells (22%). Further, B. subtilis heat-treated cells were assessed for their ability to reduce OTA levels in artificially contaminated red wine samples that resulted in an OTA reduction of approximately 90%, suggesting the biocontrol potential of the newly isolated strain B. subtilis KU-153 on OTA reduction.

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