Affiliation:
1. Microbiology Laboratory, Institute of Food Technology (ITAL), Campinas 13070-178, Brazil
Abstract
The occurrence of mycotoxigenic species in peanuts is a major concern, and has been investigated in depth for many years. However, most studies focus on the occurrence of aflatoxigenic fungi, such as Aspergillus section Flavi. The present study aimed to clarify the occurrence of Aspergillus section Nigri, a group that harbors species capable of producing ochratoxin A (OTA), which has scarcely been investigated in peanuts. A total of 52 peanut samples, collected in the field and from storage, were analyzed. Aspergillus section Nigri was isolated from 64% and 100% of field and storage samples, respectively, and 218 strains were obtained. Based on the multiloci phylogeny of the CaM and BenA loci, six species of Aspergillus section Nigri were identified: A. brasiliensis, A. niger, A. neoniger, A. welwitschiae, A. costaricaensis, and A. japonicus. The incidence of ochratoxigenic strains was 5.0% (11/218), and only A. niger and A. welwitschiae were able to produce OTA. The presence of OTA in peanuts was found in 6 field and 8 storage samples, with levels ranging from 0.106 to 0.387 and 0.090 to 0.160 µg/kg, respectively.
Funder
São Paulo Research Foundation
National Council for Scientific and Technological Development
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference48 articles.
1. USDA (2023, March 10). United States Department of Agriculture—Foreign Agricultural Service. Production, Supply and Distribution, Available online: http://apps.fas.usda.gov/psdonline/psdQuery.aspx.
2. Tanwar, B., and Goyal, A. (2021). Oilseeds: Health Attributes and Food Applications, Springer. [1st ed.].
3. Two novel aflatoxin-producing Aspergillus species from Argentinean peanuts;Pildain;Int. J. Syst. Evol. Microbiol.,2008
4. Mycobiota, aflatoxins and cyclopiazonic acid in stored peanut cultivars;Zorzete;Food Res. Int.,2013
5. The biodiversity of Aspergillus section Flavi and aflatoxins in the Brazilian peanut production chain;Martins;Food Res. Int.,2017