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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received June 25, 2019
Accepted August 15, 2019
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Free chlorine and phytic acid synergistically inactivated conidia of Aspergillus spp.

SELS Center, Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 54596, Korea
cho317@jbnu.ac.kr
Korean Journal of Chemical Engineering, November 2019, 36(11), 1799-1805(7), 10.1007/s11814-019-0366-z
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Abstract

Chlorination has been widely used to disinfect various microbials in the environment, but its fungicidal activity is known to be limited. Here, we demonstrate that a combinatorial treatment with free chlorine and phytic acid exerted high fungicidal activities against selected species of Aspergillus. Treatment with either chlorine (7mg/l) or phytic acid (~400mg/l) without pH adjustment caused marginal inactivation of Aspergillus niger conidia within 5min. However, the combinatorial treatment with free chlorine and phytic acid inactivated 98% of A. niger conidia within 5min (CT=25.7mg/l·min). Overall fungicidal efficiency of combinatorial application was higher (~256%) than the sum of inactivation levels by individual treatment, suggesting a synergistic effect between free chlorine and phytic acid. Transmission electron microscopy observation showed that free chlorine primarily disrupted nucleo-cytosolic organs, whereas phytic acid preferentially disintegrated the cell wall and plasma membrane. The combination of both agents demolished the conidial structure of A. niger. The effects of these chemicals on the cell membrane were verified with propidium iodide staining, lipid peroxidation, and extracellular ATP secretion. Fungicidal activities of chlorine and phytic acid were further confirmed against A. parasiticus and A. flavus. Our data suggest that the mixture of free chlorine and phytic acid without any additional preparation may efficiently disinfect Aspergillus spp. through the synergistic activities of individual components.

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