NDLI: Abiotic factors and their interactions influence on the co-production of aflatoxin $B_{1}$ and cyclopiazonic acid by Aspergillus flavus isolated from corn

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Abiotic factors and their interactions influence on the co-production of aflatoxin $B_{1}$ and cyclopiazonic acid by Aspergillus flavus isolated from corn

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Abiotic factors and their interactions influence on the co-production of aflatoxin $B_{1}$ and cyclopiazonic acid by Aspergillus flavus isolated from corn

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Astoreca, Andrea Vaamonde, Graciela Dalcero, Ana Marin, Sonia Ramos, Antonio
Description	Author Affiliation: Astoreca A ( Laboratorio de Microbiología de Alimentos, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina. Electronic address: astoreca@biotec.org.ar.)
Abstract	The objectives of this study were i) to determine the effects of the interactions of water activity, temperature and incubation time on the co-production of AFB1 and CPA by isolates of Aspergillus flavus with different profile of mycotoxin production and ii) to identify the aW and temperature limiting conditions for the production of both mycotoxins. Fungi used in this study were selected because they belonged to different chemotypes: chemotype I (AFB1+/CPA+), III (AFB1+/CPA-) and IV (AFB1-/CPA+), respectively. Two culture media were used; Czapek yeast agar (CYA) and corn extract agar (CEM), at different incubated temperatures (10-40 °C) and aW levels (0.80-0.98). AFB1 and CPA production were analyzed after 7, 14, 21 and 28 days of incubation. Significant differences were observed with respect to mycotoxin production depending on the media evaluated. The AFB1 production occurred more favorably on CYA while the highest CPA concentrations were recorded on CEM. Within the range of aW evaluated in this study, 0.83 was the limiting level for both toxins production. The optimum conditions for AFB1 production occurred at 0.96 aW and 30 °C after 21 days of incubation, regardless of the media and isolate. Although different amounts of toxins were produced in each medium, the limiting and optimum conditions for their production were similar in both. No differences in the response of the three isolates to the abiotic factors discussed were observed despite belonging to different chemotypes. The determination of the thresholds of mycotoxins co-production, especially in the case of data obtained with the corn extract medium can be useful to avoid the conditions conducive to co-occurrence of these mycotoxins in corn.
File Format	HTM / HTML
ISSN	07400020
Volume Number	38
e-ISSN	10959998
Journal	Food Microbiology
Language	English
Publisher	Elsevier
Publisher Date	2014-04-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Microbiology Discipline Nutritional Sciences Aflatoxin B1 Biosynthesis Aspergillus Flavus Metabolism Culture Media Indoles Zea Mays Microbiology Isolation & Purification Chemistry Temperature Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Microbiology Food Science

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