干燥方式和条件对大黄水提液蒽醌和鞣质成分含量的影响

Effects of different drying methods and conditions on anthraquinones and tannins in water extract from Radix et Rhiroma Rhei

目的:研究不同干燥方式对大黄水提液(DHY)中蒽醌和鞣质成分的影响。方法:大黄水提液分别采用冷冻干燥、减压烘干、常压烘干和喷雾干燥等4种不同干燥方式进行干燥,以含水量5%为标准,测定比较各干燥样品的总蒽醌、游离蒽醌、结合蒽醌和鞣质的含量。结果:不同干燥方式样品总蒽醌、游离蒽醌、结合蒽醌和鞣质含量存在较大差别,以冷冻干燥样品各项成分含量最高,常压干燥100℃样品含量最低。结论:温度是大黄水提液干燥过程中的重要因素。在实验范围内,大黄水提液在60℃以下干燥基本稳定,90℃以上长时间干燥不稳定。

Objective： To investigate effects of different drying methods on the content of anthraquinones and tannins in water ex- tract from Radix et Rhiroma Rhei （DHY）. Method： DHY was dried by freeze drying, vacuum drying, drying under normal press and spray drying respectively until its moisture has been 5%. The content of anthraquinones and tannins of samples by different drying methods was determined and compared with. Result： The content of total anthraquinones, free anthraquinones, conjugated anthraquinones and tannins of samples by different drying methods was some different. Samples with freeze drying were highest and samples with drying under normal press at 100℃ were low. Conclusion： Temperature is an important pole in drying process water extract from Radix et Rhiroma Rhei. In our study water extract from Radix et Rhiroma Rhei was stable under 60℃ on the whole and unstable when drying exceed in 90℃.