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中药浸膏,基本分为水提和酒提两大类。提取方法不同,基片浸膏的化学成分也不同,这些成分在包衣干燥时所起的变化也不同。酒提浸膏,往往含有树脂类。树脂类有遇热变软,遇高温而液化的特点。如果基片中含树脂的比重较大,则基片在包衣干燥中就可能起一定变化,甚至导致龟裂。水提浸膏一般不含有树脂类。“消喘止咳片”为水提浸膏片,其主要成分为生物硷、甙类、鞣质等,在包衣干燥时,仅是水份的挥发,而性状、体积变化甚微。试验表明,当基片水份在1%～8%时,包衣时加热(55℃以下)干燥不致
Chinese herbal extracts are basically divided into two categories: water extraction and wine extraction. The extraction method is different, and the chemical composition of the substrate extract is also different. These components also have different changes when the coating is dried. Wine extracts often contain resins. Resins are characterized by softening under heat and liquefaction under high temperatures. If the specific gravity of the resin contained in the substrate is large, the substrate may undergo certain changes in the drying of the coating and even cause cracking. Water extracts generally do not contain resins. “Sichuan Zhike Tablet” is a water extract tablet. Its main components are biological fleas, alfalfa, tannin, etc. When the coating is dry, only moisture evaporates, but the properties and volume change little. Tests show that when the moisture content of the substrate is between 1% and 8%, the coating is not dried when heated (below 55°C).