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眼氨肽滴眼液中抑菌剂的含量测定及活性炭对抑菌剂的吸附性研究

Content determination of bacteriostats in ocular extractives eye drops and the absorption effect of activated carbon on it

  • 摘要: 建立一种检测眼氨肽滴眼液中抑菌剂含量的HPLC法,使用Diamonsil C18(4.6 mm×250 mm,5 μm)色谱柱,以1%三乙胺溶液(用磷酸调节pH至 3.0)为流动相A,甲醇为流动相B进行梯度洗脱,检测波长为256 nm,柱温40 ℃,流速1.0 mL/min。在该条件下羟苯甲酯、羟苯乙酯和醋酸氯己定3种抑菌剂分离度良好,各抑菌剂在0.1~80 μg/mL质量浓度范围内,峰面积与浓度呈良好线性关系(r>;0.999 1),回收率分别为97.2%~104.1%,RSD为0.8%~1.2%。用该法检测的5批市售眼氨肽滴眼剂抑菌剂含量均低于处方量的10%,经考察发现生产工艺中使用的活性炭对于抑菌剂有强吸附作用,温度越低、活性炭浓度越高对抑菌剂的吸附越强,其中活性炭对不同抑菌剂的吸附能力由大到小分别为:醋酸氯己定、羟苯乙酯、羟苯甲酯。结果表明,建立的HPLC法,操作简便,灵敏度高,重复性好,可用于快速准确测定眼氨肽滴眼液中抑菌剂含量;此外,本研究首次揭示了眼氨肽滴眼液生产中除杂工序对抑菌剂的影响,结果表明,在除杂质工序中,不适宜在添加尼泊金酯类和醋酸氯己定抑菌剂前使用活性炭除杂质,为其生产质量监控与提升提供了新的指导方案。

     

    Abstract: To establish a high performance liquid chromatography(HPLC)method to determine the content of bacteriostats in the ocular extractives eye drops, Diamonsil C18(4. 6 mm×250 mm, 5 μm)column was used, with gradient elusion by 1% triethylamine solution(pH 3. 0)(mobile phase A)and methanol(mobile phase B). The detection wavelength was 256 nm; the column temperature was 40 °C; and the flow rate was 1. 0 mL/min. Under these conditions, the three bacteriostats of methylparaben, ethylparoben and chlorhexidine acetate showed good resolution. The bacteriostats exhibited good linear relationship between the peak area and the concentration in the concentration range of 0. 1- 80 μg/mL(r> 0. 999 1). The recoveries were from 97. 2% to 104. 1%, and the RSD was 0. 8% to 1. 2%. The content of bacteriostats in all the five batches of ocular extractives eye drops was less than 10% of the prescription amount. It was found that the activated carbon used in the production process had strong adsorption effect on the bacteriostat, and that the lower the temperature and the higher the concentration of activated carbon, the stronger the adsorption of bacteriostatic agent. The adsorption capacity of activated carbon for different bacteriostats is: chlorhexidine acetate > ethylparoben > methylparaben. The results showed that the established HPLC method was easy to operate with high sensitivity and good repeatability. It can be used to determine the content of bacteriostat in ocular extractives eye drops quickly and accurately. In addition, this study reveals for the first time the effect of impurity removal process on bacteriostat in the production of ocular extractives eye drops. It is not suitable to use activated carbon to remove impurities before adding parabens and chlorhexidine acetate bacteriostats. The current work provides a new guiding basis for the monitoring and improvement of the quality of ocular extractives eye drops.

     

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