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中药处方的“后下”系指此种药物在煎煮时要比其它药后入药锅。“后下”是汤剂制备中关系汤剂质量的重要技术之一.调剂工作中处方常见的后下药多为芳香性药物,如薄荷、砂仁、荆芥等。但科学研究表明,在常压条件下,采用常规煎煮法,中药含的挥发油类成分可随水蒸气蒸发;有的虽不是挥发油也可随之蒸发;有些甙可分解成甙元和糖;有的化学结构发生变化。以上几种现象都会影响汤剂的质量。很显然群药共煎的方法难以保证汤剂质量,但对遇热不稳定的药物,在煎煮时采用后下的方法,可基本得到解决。本文按化学成分把汤剂后下药分类,并阐明后下的原理和调配
The “post-below” prescription for Chinese medicine refers to the fact that the medicine is decocted into the pan after other medicines. “Behind the next” is one of the important technologies for the quality of decoction in the preparation of decoction. The commonly used post-adhesives in prescriptions are aromatic drugs, such as mint, villosum, and Nepeta. However, scientific research shows that, under normal pressure conditions, using conventional decoction, volatile oils contained in Chinese herbs may evaporate with water vapor; some may evaporate with volatile oils; some may be decomposed into glycosides and sugars; Some chemical structures change. The above several phenomena will affect the quality of decoction. Obviously, the method of co-flooding by group medicines can hardly guarantee the quality of decoctions, but it can basically be solved when the method of boiling unstable foods is used in the decoction. This article classifies the drug after the decoction according to chemical composition, and clarifies the principle and deployment