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Effect of propionic acid on the growth and aflatoxin production by aspergillus flavus


, : Effect of propionic acid on the growth and aflatoxin production by aspergillus flavus. Summa Phytopathologica 11(3-4): 220-229

Aiming to know the effect of propionic acid on the growth and aflatoxin synthesis by a toxigenic strain of Aspergillus flavus, a dilution series (10-1 to 10-6) added to CAM culture medium "in vitro" experiment was prepared. Effects on the growth were measured through diameter differences of the fungus colonies after 6 days incubation under 25.degree. .+-. 1.degree. C, of treated and control cultures. Effects on aflatoxin synthesis were estimated through direct observations of the fluorescence of cultures under U.V. light completed by quantitative thin layer chromatography and photodensitometry. Results showed a complete growth inhibition of the fungus A. flavus induced by 10-1 and 10-2 propionic acid dilutions. Lack of fluorescence was observed at same dilutions and also at 10-3 propionic acid dilution. Quantitative analysis determined that B1 and G1 aflatoxins were not synthesized at 10-1 and 10-2, but were present at 10-3 to 10-6 propionic acid dilutions, at increasing rates, not differing statistically from control. Data obtained in these experiments indicate there was a fungitoxic effect, with complete inhibition of growth and aflatoxin synthesis by the fungus A. flavus. Results may be applied in the control of parasite and its aflatoxin synthesis on cereals grains consumed in human or animal feeding.

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