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Effect of potassium sorbate (E‐202) and the antifungal PgAFP protein on Aspergillus carbonarius growth and ochratoxin A production in raisin simulating media.

Authors: Fodil, S., Delgado, J., Varvaro, L., Yaseen, T., & Rodríguez, A.
  • Journals: J Sci Food Agric
  • Pages:
  • Year: 2018

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BACKGROUND: Ochratoxin A (OTA) is a mycotoxin produced by several species of Aspergillus and Penicillium fungi. The presence of OTA in raisins is mainly related to the black Aspergillus spp. contamination. This toxin poses risks to human and animal health due to their high toxicity and carcinogenicity. Therefore, new strategies to avoid the risk associated to OTA are necessary. RESULTS: In the present study, a comparison between the effects of the antifungal protein PgAFP and potassium sorbate (E-202), on the growth of Aspergillus carbonarius, biosynthetic- and stress-related gene expression and its OTA production at two water activity (aw ) levels 0.95 and 0.93 aw , was carried out. The results showed that PgAFP successfully controlled OTA production, whereas E-202, although was able to decrease Aspergillus carbonarius growth, caused a significant increase in OTA production by the fungus. CONCLUSION: PgAFP protein, a biological compound with an antifungal activity, is safer to use compared to E-202 and may be proposed as a food preservative and a useful biocontrol strategy to control ochratoxigenic A. carbonarius in raisins.