论著
双氯芬酸钠大鼠在体肠吸收的研究
石英杰 ,王锐利 ,张丽锋 ,任国莲 ,张淑秋
【摘要】 【摘要】目的 评价双氯芬酸钠在大鼠不同肠段的吸收特征,为其剂型设计提供依据。方法 采用大鼠单向灌流模型、高效液相法测定在体灌流液中双氯芬酸钠的浓度,计算吸收性能参数。
【关键字】 双氯芬酸钠,肠吸收,单向肠灌流,重量法
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[Abstract] Objective The aim of the study is To investigate the absorption characters of diclofenac sodium at different intestinal segments in rats for providing theoretical basis for dosage design. Methods The single-pass perfusion model in situ was established in rats, the concentration of diclofenac sodium in intestinal perfusion was determined by HPLC. Results The apparent absorption constants Ka in duodenum, jejunum, ileum and colon were (5.28±0.68), (6.42±0.95), (8.47±0.69), (5.89±0.51) (Ka,×10-2 /min)respectively. Intestinal Ka of diclofenac sodium at different concentrations (5,10, 20 g/mL) were (4.56±0.18), (4.32±0.15), (4.76±0.21) (Ka,×10-2/min)respectively. Intestinal Ka of diclofenac sodium at different volum eticflowrate(0.2, 0.4, 0.8 mL/min) were (4.32±0.15), (5.88±0.14), (6.92±0.18) (Ka,×10-2/min) respectively. Conclusion Diclofenac sodium appeared absorbable in all segments of rat intestine. The intestinal absorption rate of diclofenac sodium followed first-order kinetics and was consistent with passive transportation over the concentration range of 5-20 g/mL.These findings indicated that diclofenac sodium can be prepared as sustained release preparations or enteric-coated preparations.
双氯芬酸钠(diclofenac sodium,DS)为邻氨基苯甲酸衍生物[1],在临床上用于缓解急慢性关节炎、急慢性强直性脊柱炎、肩周炎、滑囊炎、急性的轻、中度疼痛及各种原因引起的发热等。该药在体内的半衰期短[2](t1/2约1.5 h),血药浓度低,须频繁给药,因此研究和开发其缓释制剂更符合临床治疗的要求。
在进行药物处方研究时,可以药物肠道吸收特征为指导。本文采用在体单灌流法研究双氯芬酸钠的肠吸收动力学特征,阐述其可能的吸收机制,以期为药物的处方设计提供生物药剂学依据。
1 材 料
试剂:双氯芬酸钠(宁波斯迈克制药有限公司、批号:DOSR-1504015);乌来糖(批号1203147,上海展云化工有限公司);乙腈、甲醇(天津市科盟化工工贸有限公司、色谱纯);其他试剂均为分析纯。
仪器:Agilent1200 高效液相色谱系统(美国安捷伦公司),FA1104N 电子天平,HH-2数显恒温水浴锅(上海浦东物理光学仪器厂),HL-2S恒流泵(上海嘉鹏科技有限公司)。
动物:健康雄性Wistar大鼠,重量(230±20)g(山西医科大学实验动物中心提供)。
灌流液:Krebs-Ringer 试剂:称取NaCl 7.8 g、NaHCO3 1.37 g、KCl 0.35 g、NaH2PO4 0.32 g、CaCl2 0.37 g,MgCl2 0.02 g、葡萄糖1.48 g加蒸馏水至1000 mL,调节pH至7.4。
2 方法与结果
2.1 灌流液中药物的方法学考察
2.1.1 色谱条件:色谱柱:Aglient HC-C8 (4.6 mm×250 mm,5 L),流动相:乙腈-0.4%乙酸铵溶液-三乙胺(45∶55∶0.2),流速:0.7 mL/min,检测波长:275 nm,柱温:30 ℃,进样量:20 L。tR为6.9 min。