ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest and stored corn in Brazil: mycoflora interaction, abiotic factors and mycotoxin occurrence.

Pozzi, C. R.; Correa, B.; Gambale, W.; Paula, C. R.; Chacon-Reche, N. O.; Meireles, M. C. A.;

Food Additives and Contaminants Year: 1995 Vol: 12 Issue: 3 Pages: 313-319 Ref: 19 ref.

1995

บทคัดย่อ

The mycoflora of 130 samples of postharvest and stored maize originating from Ribeirao Preto, Sao Paulo, Brazil, was analysed during 1991. The influences of abiotic factors (moisture content, relative humidity, temp. and rainfall) and mycotoxin occurrence were also studied. Fungi were isolated on potato dextrose agar and were identified by standard techniques. Mycotoxin determination was performed by TLC. Fusarium spp. were the most dominant fungi (83.8%), followed by Penicillium spp. (55.3%), Aspergillus spp. (40.7%) and 11 other filamentous fungi. All fungi were isolated from grains with moisture contents of 12.3-17.8%, a mean temp. of 18.4-24.1 deg C, a relative humidity of 64.0-97.5% and rainfall of up to 337 mm. With regard to the number of colony forming units, Fusarium spp. were the main contaminant, varying from 545 to 1.5 x 103. There was a significant positive correlation of Fusarium with moisture content of grains and a significant negative correlation in relation to the minimum and m

edium temp., rainfall and relative humidity. The linear correlation of Penicillium and Aspergillus with the abiotic factors was not significant. Only 1 sample analysed contained aflatoxin B1.