Parboiled rice: chemical composition and the occurrence of mycotoxins

Abstract

The objective of this work was to evaluate the incidence of aflatoxin B1 (AFB B1), deoxynivalenol (DON), ochratoxin A (OTA), and zearalenone (ZEA) in parboiled rice with respect to its chemical composition. Eight lots from five different brands of parboiled rice were collected in four samplings, at different seasons, until the amount of 32 lots. It was observed that: DON was present in 22% of the samples (from 180 to 400 ppb); ZEA in 19% (from 317 to 396 ppb); OTA in 12.5% (from 13 and 26 ppb); and AFB B1 in 9% (from 11 to 74 ppb). The results of the chemical composition were not different from those previously mentioned in the literature concerning parboiled rice. The ash and phenol levels in the contaminated parboiled rice samples suggested that those compounds had a relation to the occurrence of OTA, DON and ZEA mycotoxins.

O objetivo deste trabalho foi avaliar a incidência de aflatoxina B1 (AFB B1), deoxinivalenol (DON), ocratoxina A (OTA) e zearalenona (ZEA) em arroz parboilizado, relacionando com a composição química. Foram coletados oito lotes de cinco marcas em quatro amostragens, realizadas em diferentes épocas, perfazendo um total de 32 lotes. Foi observado que DON estava presente em 22% das amostras (180-400 ppb), ZEA em 19% (317-396 ppb), OTA em 12,5% (13-26 ppb) e AFA B1 em 9 % (11-74 ppb). Os resultados da composição química não foram diferentes dos citados em literatura sobre arroz parboilizado. Porém, os teores de cinzas e fenóis, nas amostras contaminadas, sugerem que esses compostos estavam relacionados com a ocorrência das micotoxinas OTA, DON e ZEA.