荸荠皮热风干燥工艺及其对抗氧化性的影响

Hot air drying process of Chinese water chestnut peel and its effect on antioxidation capacity

为考察荸荠皮的干燥特性及其对荸荠皮抗氧化性的影响,采用热风干燥法对新鲜荸荠皮进行了干燥试验。结果表明,在80℃和90℃下干燥时,荸荠皮干燥特性曲线较为接近,而在70℃下区别明显;采用最小二乘多项式法拟合各温度下的数学干燥模型,效果良好,决定系数均在0.99以上,方差分析结果达到极显著水平;荸荠皮清除羟自由基的能力随着干燥时间延长呈下降趋势,干燥温度越高,抗氧化能力下降越快;在干燥前期,荸荠皮抗氧化能力下降速度缓慢,干燥一定时间后,其下降速度增大。

Hot air drying was adopted to evaluate the drying characteristics of fresh Chinese water chestnut peel and its change on antioxydation.The drying curve under 80℃ was analogous to that of 90℃,while the curve under 70℃ wais more unliked.Least squares polynomials were used to match the drying process under different temperature.The result showed that all the R2 values of the mathematical models were greater than 0.99,it illustrated that all the mathematical models were significant.The materials＇ ability of eliminating hydroxyl radical was drooping along with the drying process,higher temperature and longer drying time would lead to more obvious result of that.The antioxidation capacity decreased slowly during the early stage of drying and sharply during the late stage.