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Effect of high temperature treatment on disinfestation and quality characteristics of sorghum.

More, H. G.; Stenning, B. C.; Magan, N.;

Annals of Applied Biology Year: 1992 Vol: 120 Issue: 1 Pages: 161-171 Ref: 23 ref.

1992

บทคัดย่อ

Effect of high temperature treatment on disinfestation and quality characteristics of sorghum.

Sorghum grain (2 varieties) was modified to different water contents (12-16% wet weight basis) and heated to 60, 70 and 80 deg C for periods of 4, 8 and 12 min. Germination, seedling vigour, seedling dry matter, free fatty acid (FFA) content, fungal contamination and infestation with the bostrichid Rhyzopertha dominica were all markedly affected by heat treatment. The effectiveness of the heat treatment was also influenced by the size of the sample used. Heat treatment at 60 and 70 deg C resulted in germination being unaffected or stimulated while at 80 deg C and the higher water contents germination was significantly reduced, compared with untreated controls. Seedling dry weight and vigour were positively correlated with germination and heat treatment. Heat treatment had no effect on FFA. All stages of R. dominica were destroyed during 8 min exposure to 70 deg C. The water content of the sorghum, however, was critical in determining the efficacy against this pest. The percentage fungal contamination of grain was reduced from 90% to about 25% by heat treatment. Some grain fungi, particularly Eurotium spp., Aspergillus niger and Penicillium spp., however, could still be isolated from sorghum grain treated at 80 deg C for up to 12 min.