ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Mycoflora and occurrence of fumonisins in freshly harvested and stored hybrid maize.

Orsi, R. B.; Correa, B.; Possi, C. R.; Schammass, E. A.; Nogueira, J. R.; Dias, S. M. C.; Malozzi, M. A. B.;

Journal of Stored Products Research Year: 2000 Vol: 36 Issue: 1 Pages: 75-87 Ref: 41 ref.

2000

บทคัดย่อ

The study of the mycoflora in stored grain permits an evaluation of cereal storage conditions that affect grain deterioration and the risk of mycotoxin contamination. Abiotic factors can directly affect the relative frequency of fungal populations in stored grain. The aim of the present work was to study the influence of abiotic factors on variations of mycoflora of freshly harvested and stored maize in, Sao Paulo, Brazil and the occurrence of fumonisins. Samples (195) of three hybrids (Br 201, C125 and Cx 322) of maize were analysed monthly during one year. Microbiological analysis revealed a predominance of Fusarium spp, which presented the greatest total number of CFUs per gram in the three hybrids, namely: Br 201 (11x104 to 5340x104 CFU/g), C 125 (18x104 to 2790x104 CFU/g) and Cx 322 (25x104 to 2940x104 CFU/g), followed by Penicillium spp, Aspergillus spp and 10 other fungal genera. Fusarium moniliforme [Gibberella fujikuroi] was the most prevalent species (59.2% of Fusarium isolates in Br 2

01, 55.4% in C 125 and 69.2% in Cx 322). Fusarium spp showed significant negative correlations with mean temperature and relative humidity of the air. Higher temperatures and relative humidity at the end of the study and high moisture content at the beginning of the study were observed. The CFU/g values recorded for the three predominant genera exceeded the internationally accepted tolerance limits. The mycotoxicological evaluation indicated contamination of 176 samples (90.2%) with fumonisin B1 and of 190 samples (97.4%) with fumonisin B2.