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Biodegradation of aflatoxin B1 by Aspergillus terreus HNGD-TM15 and its degradation mechanism

In: World Mycotoxin Journal
Authors:
T. Wu College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, 100# Lianhua Street, 450001 Zhengzhou, China P.R.

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M. Ning College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, 100# Lianhua Street, 450001 Zhengzhou, China P.R.

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S. Zhang Key Laboratory of Detection for Mycotoxins, Ministry of Agriculture, 430062 Wuhan, China P.R.

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Y. Xie College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, 100# Lianhua Street, 450001 Zhengzhou, China P.R.

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https://orcid.org/0000-0002-3895-5959
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Q. Li College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, 100# Lianhua Street, 450001 Zhengzhou, China P.R.

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S. Sun College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, 100# Lianhua Street, 450001 Zhengzhou, China P.R.

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Abstract

The Aspergillus terreus strain HNGD-TM15 that was isolated from soil grown with rosemary was shown to efficiently degrade aflatoxin B1 (AFB1). Specifically, AFB1 was degraded by the strain’s fermentation broth at a maximum degradation rate of 98.3%. HPLC and LC-MS analyses detected a degradation product with an m/z ion value of 312.0636. Its molecular formula was C18H39NO3, which was tentatively identified as 2-amino-1, 3,4-octadecatriol. Based on LC-MS results and further analysis, it was revealed that a series of reactions, such as decomposition, reduction (lactone ring hydrogenation) and substitution (hydrolysis), occurred during the degradation of AFB1. Therefore, A. terreus HNGD-TM15 has a great potential for application in the detoxification of AFB1 contaminating food and feed products.

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