不同水分、温度条件下CO_2浓度对稻谷品质的影响

EFFECT OF CO_2 CONCENTRATION ON QUALITY OF PADDY AT DIFFERENT MOISTURE CONTENTS AND TEMPERATURES

试验选用当年新收获的稻谷，其水分为12．7％、13．9％和15．1％，在23℃和33℃的恒温室中，将7种不同浓度的CO2气体经减压调湿后通入粮堆。定期取样，测定稻谷的脂肪酸、水溶酸、还原糖、非还原糖、粘度、过氧化物酶和发芽率的变化。试验结果表明，CO2对15．1％水分的稻谷在33℃下储藏的脂肪酸、水溶酸的变化有影响。在本试验中三种水分的稻谷在CO2浓度98％以上，在两种温度下储藏都能够延缓过氧化物酶活性的降低。这些结果说明，CO2对稻谷有一定的保质作用。但对稻谷的还原糖、非还原糖、布拉班德粘度最高值和发芽率没有明显的影响。

Paddy freshely harvested of 12. 7, 13. 9and 15.1% moisture contents was stored at the contant temperatures of 23 and 33℃. CO2 gas of 7 concentrations was introduced into grain bulk under reduced pressure and tempering. The samples were taken regularly to determine fatty acid, soluble acid, reducing Sugar, non─reducing sugar, viscosity and peroxidase. The results showed that at 15.1% m.c, 33℃,CO, has effect on changes of fatty acide and soluble acid. When 98% CO2 concentrations, paddy of 3 moisture contents was stored at 23 and 33℃,reduction of peroxidase activity was delayed. The effect of CO2 on reducing sugar, non─reducing sugar, the highest value of viscosity and germination was not significant.