Physicochemical treatments for the reduction of aflatoxins and Aspergillus niger in corn grains (Zea mays).

Physicochemical treatments for the reduction of aflatoxins and Aspergillus niger in corn grains (Zea mays).

J Sci Food Agric. 2020 Dec 10;:

Authors: Castro-Ríos K, Montoya-Estrada CN, Martínez-Miranda MM, Hurtado Cortés S, Taborda Ocampo G

Abstract
BACKGROUND: Corn grains are commonly contaminated with mycotoxins and fungi. The purpose of this study was to evaluate the reduction of aflatoxins B1 , B2 , G1 , and G2 and the inhibition of Aspergillus niger in corn grains using ultrasound, ultraviolet radiation (UV), electrolyzed water, and sodium bicarbonate. The determination of aflatoxins was performed by HPLC-FD and postcolumn derivatization, and analysis of A. niger was performed by evaluating mycelial growth in potato dextrose agar (PDA). The best treatment for reducing aflatoxins and inhibiting mycelial growth was evaluated in corn contaminated with A.niger.
RESULTS: The results show a significant reduction in aflatoxins in the following order: sodium bicarbonate > ultrasound > UV > electrolyzed water for aflatoxins B1 , B2, and G2 . For aflatoxin G1 , the order of reduction was sodium bicarbonate > ultrasound > electrolyzed water > UV, with maximum values between 70.50% and 87.03% reached with sodium bicarbonate; for the other treatments, the reduction was between 51.51% and 65.44%. Regarding the fungus, the order of inhibition in the control of mycelial growth was sodium bicarbonate > ultrasound > electrolyzed water > UV in corn grains, and inhibition of mycelial growth was obtained at a sodium bicarbonate concentration of 3.0 g L-1 .
CONCLUSION: Sodium bicarbonate, electrolyzed water, ultrasound, and UV radiation inhibited the growth of A. niger on PDA and reduced the contents of aflatoxins B1 , B2 , G1 , and G2 in vitro. Sodium bicarbonate showed an ability to inhibit mycelial growth in corn grains. This article is protected by copyright. All rights reserved.

PMID: 33301189 [PubMed – as supplied by publisher]

Source: Industry