正交试验法优选大黄丁产地趁鲜加工工艺

Optimization of the process of diced Rhei Radix et Rhizoma fresh processing on origin by orthogonal test

为了优选大黄丁产地趁鲜加工工艺,采用正交试验法考察圆片厚度、初干温度、干燥程度、复干温度4个因素对大黄丁水分、游离蒽醌、总蒽醌、干燥时长的影响。结果表明,4个因素对大黄丁总蒽醌含量的影响均不显著;圆片厚度、初干温度对大黄丁游离蒽醌含量影响显著;干燥程度对大黄丁水分影响极显著;各因素对大黄丁总干燥时长影响显著或极显著。大黄丁产地趁鲜加工最佳工艺为将处理好的鲜大黄根茎横切为厚12 mm的圆片,于60℃干燥至含水量60%,再将圆片按长宽各12 mm切丁,然后70℃干燥至含水量13%以下。以该加工工艺生产大黄丁,游离蒽醌含量较高,干燥用时较短,总蒽醌含量无显著下降。

To optimize the process of diced Rhei Radix et Rhizoma fresh processing on origin,the effects of slice thickness,drying temperature before slicing,drying degree and drying temperature after slicing on water content,free anthraquinone,total anthraqui-none and drying time of diced Rhei Radix et Rhizoma were investigated by orthogonal test.The results showed that the influence of four factors on the total anthraquinone content of diced Rhei Radix et Rhizoma was not significant.The slice thickness and drying tempera-ture before slicing had significant effects on the free anthraquinone content of diced Rhei Radix et Rhizoma.The drying degree had an extremely significant effect on the moisture content of diced Rhei Radix et Rhizoma.All factors had significant or extremely significant effects on the total drying time of diced Rhei Radix et Rhizoma.The best processing technology of diced Rhei Radix et Rhizoma fresh processing on origin was as follows:The first step was to cut fresh Rhei Radix et Rhizoma rhizomes into 12 mm thick slices;the sec-ond step was to dry the slices at 60℃until the water content was 60%;then,the slices should be diced to 12 mm length and 12 mm width;finally,the diced Rhei Radix et Rhizoma should be dried at 70℃to a moisture content below 13%.With the above processing technology,the content of free anthraquinone of diced Rhei Radix et Rhizoma was higher,the drying time was shorter and the content of total anthraquinone was not significantly decreased.