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有的人在服中药时,觉得中药苦涩难咽,就索性长时间地煎煮,把药液煎得很浓仅剩一点点,这样做是不可取的。首先,煎药时药物的有效成分由内向外渗出,当煎煮到一定时间,药液达到一定浓度时,有效成分便停止析出,再继续煎煮,药物浓度也不会提高。其次,有些药物长时间煎煮,有效成分会不断挥发减少,如解表药物,有效成分会随水蒸气挥发,煎煮时间越长,挥发得越多,药效越低。
Some people are serving Chinese medicine, I feel bitter and hard to swallow the Chinese medicine, it took a long time to cook, the liquid fried very thick only a little left, this is not desirable. First of all, when the medicine decoction from the inside out the active ingredient exudation, when boiling to a certain time, the liquid reaches a certain concentration, the effective ingredient will stop precipitation, then continue boiling, the drug concentration will not increase. Second, some drugs decoction for a long time, the active ingredient will continue to reduce the volatility, such as drug solution table, the active ingredient will be volatile with water vapor, boiling longer, the more volatile, the lower efficacy.