神经毒素纳米粒大鼠鼻腔给药的脑药物动力学研究
Optimization of ambroxol hydrochloride sustained-release tablets formulation by central composite design-response surface methodology
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摘要: 目的:考察神经毒素(NT-1)纳米粒经大鼠鼻腔给药后的脑药物动力学特征。方法:采用125I同位素标记法,以清醒自由活动大鼠为实验模型,运用脑微透析取样技术,连续测定NT-1纳米粒和NT-1经大鼠鼻腔给药后右侧嗅球组织间液的放射性计数(min-1),再折算成相应的NT-1浓度,并利用药动学软件计算各个参数。结果:NT-1鼻腔给药后无法进入脑内,而NT-1纳米粒可进入脑内,其药动学符合开放性二室模型,tmax、cmax、AUC0→∞、t1/2(β)分别为(46.38±5.12)min、(3.98±0.51)ng/mL、(876.24±55.32)ng.min/mL和(132.45±24.26)h-1。结论:单纯NT-1鼻腔给药后无法进入脑内,而以纳米粒为载体,可显著增加其鼻腔吸收入脑,且能较快达到峰浓度,消除缓慢。Abstract: Aim:To optimize the formulation of ambroxol hydrochloride sustained-release tablets by the central composite design-response surface methodology(RSM plus CCD).Methods:In the formulation design using RSM plus CCD,independent variables were the amounts of H