บทคัดย่องานวิจัย

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Effect of moisture content and temperature on respiration rate of rice.

Dillahunty, A. L.; Siebenmorgen, T. J.; Buescher, R. W.; Smith, D. E.; Mauromoustakos, A.;

Cereal Chemistry Year: 2000 Vol: 77 Issue: 5 Pages: 541-543 Ref: 11 ref.

2000

บทคัดย่อ

Effect of moisture content and temperature on respiration rate of rice.

One cause of postharvest yellowing or stackburn of rice may be elevated respiration rates caused by storage at either high moisture content (MC) or temperature. The effect of MC and temperature on the respiration rate of Oryza sativa cv. Bengal and Cypress harvested in autumn 1998 was investigated. For respiration rate measurement of rough rice at different temperatures, rice samples at high, medium, and low MC were sealed in quart jars and equilibrated to temperatures of 20-80 deg C. The respiration rate was quantified by measuring the rate of CO2 accumulation in the free air space. To determine the effect of MC on respiration rate, rough rice was tested at 12-25% MC. Respiration was greatly affected by MC and temperature. The response of respiration to temperature was dependent on MC and varied between rice cultivars. Respiration rates increased as MC increased from approx equal to 15 to 25%. Maximum respiration was at 50 deg C when MC was high (20-25%). At 15% MC, respiration increased from 2

0 to 70 deg C, while respiration of 12% MC rice, although very low, appeared to increase up to 80 deg C. A model was developed from this data to predict the respiration rate of rice over the MC range tested.