Distribution of aflatoxins in shelling and milling fractions of naturally contaminated rice

M. W. Trucksess, H. K. Abbas, C. M. Weaver, W. T. Shier

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The objective of this study was to determine the distribution of an economically important class of mycotoxins, the aflatoxins, in rice milling fractions. Rice plants grown under field production conditions are frequently infected with types of pathogenic fungi that produce toxic metabolites (mycotoxins). Paddy (seeds) rice from healthy plants in the field was collected and stored on a farm under humid, poorly ventilated conditions. Samples were milled into four fractions (hulls, brown rice, bran and white rice) and analysed for aflatoxins (B1, B2, G1 and G2) using a validated method. Rice fractions from healthy plants, which contained low levels of aflatoxins (less than 1 μ gkg-1), were used to determine the efficiency of the extraction method. Seeds stored under poor conditions were found to be contaminated with aflatoxins B1 and B2 as were the fractions. The sums of AFB1 and AFB2 in stored paddy rice, hulls, brown rice, bran and white rice were 141, 39, 158, 367 and 56 μ gkg-1, respectively. The ratio of aflatoxin B1 and B2 was about 10: 1. AFG1 and AFG2 were less than 1 μ gkg-1. Thus, brown rice contained 92.9% of the aflatoxins in paddy rice, whereas white rice contained only 27.9%.

Original languageEnglish (US)
Pages (from-to)1076-1082
Number of pages7
JournalFood Additives and Contaminants
Volume28
Issue number8
DOIs
StatePublished - Aug 2011

Keywords

  • Aflatoxins
  • Cereals
  • Hplc
  • Mycotoxins
  • Natural toxicants
  • Rice

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