咳平片为常用镇咳药。本文采用一阶导数光谱法测定含量,消除了辅料干扰,不需除去糖衣,操作简便,结果准确。一、仪器和药品仪器:日本岛津UV一260型分光光度计药品:咳平对照品(四平春光药厂提供)、淀粉、糊精、硬脂酸镁、滑石粉、蔗糖均为药用规格. 二、导数光讲浦定条件 1.处方咳平10g糊精一20g Cough tablets for the common cough medicine. In this paper, the first-order derivative spectrophotometry was used to determine the content, eliminating the interference of excipients, eliminating the need for sugar coating, and the operation was simple and the result was accurate. First, instruments and pharmaceutical equipment: Japan Shimadzu UV-260 spectrophotometer drugs: cough reference substance (Siping Spring Pharmaceutical Factory), starch, dextrin, magnesium stearate, talc, sucrose are pharmaceutical specifications Second, the derivative light conditions Puding 1. Prescription Keping 10g dextrin a 20g