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在pH5.3的BR缓冲体系中,灿烂甲酚蓝与七叶皂苷钠作用,形成离子缔合物,溶液颜色发生改变.其最大显色波长位于568nm处,在该波长处,七叶皂苷钠的浓度与溶液的显色强度呈良好的线性关系.该方法在七叶皂苷钠的浓度0.19～30.0mg·L-1范围内遵守比尔定律,相关系数r=0.9995,摩尔吸光系数为1.9×104L·mol-1·cm-1,检出限为56.5μg·L-1.该方法灵敏度高,检测限低,用于片剂中七叶皂苷钠的测定,结果满意.
In pH5.3 BR buffer system, brilliant cresyl blue and aescin sodium role to form ion-association, the color of the solution changes its maximum color wavelength is located at 568nm, at this wavelength, aescin sodium Beer’s Law was obeyed in the range of 0.19 ~ 30.0 mg · L-1, the correlation coefficient was 0.9995 and the molar absorptivity was 1.9 × 104 L · Mol -1 · cm -1 .The detection limit was 56.5 μg · L -1 .The method was sensitive and the detection limit was low.It was used for the determination of sodium aescinate in the tablets with satisfactory results.