Evaluation of food grade antioxidant formulation for sustained antifungal, antiaflatoxigenic and insecticidal activities on peanut conditioned at different water activities

GARCÍA, D.; GIRARDI, N.S.; PASSONE, M.A.; NESCI, A.; ETCHEVERRY, M.

JOURNAL OF STORED PRODUCTS RESEARCH

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 65 p. 6 - 16

0022-474X

The aim of this study was to investigate antifungal and insecticidal activity of two microencapsulatedantioxidants: 2(3)-tert-butyl-4 hydroxyanisole (BHA) and 2,6-di(tert-butyl)-p-cresol (BHT) againstAspergillus section Flavi and Oryzaephilus surinamensis (L.), a vector carrier of aflatoxigenic fungi onstored peanuts. Susceptibility of Aspergillus section Flavi, insects, and aflatoxin B1 accumulation in sterilepeanut kernels conditioned at two different water activities (aw) (0.83 aw and 0.95 aw) was determinedwith different doses of antioxidant formulations (10, 20 and 30 mM) during 45 days. Moreover, Aspergillussection Flavi isolation frequency from live and dead insects was evaluated. The BHA formulationcompletely inhibited Aspergillus section Flavi development regardless of aw and doses assayed. Antifungaleffect of microencapsulated BHT was highly dependent on aw, with 86e100% fungal inhibition at 20 and30 mM, at the lowest aw (0.83 aw) and at the end of the experiment. No aflatoxin accumulation wasdetected in samples treated with the BHA formulation. In general, low levels of Aspergillus section Flaviwere detected in dead insects. Our results show efficacy for 45 days, in addition microencapsulated BHTcould be an alternative to control peanut pests in dry kernels.