甘草酸对大鼠体内硝苯地平药动学的影响
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篇名: 甘草酸对大鼠体内硝苯地平药动学的影响
TITLE:
摘要: 目的:研究甘草酸对大鼠体内硝苯地平药动学的影响。方法:将大鼠随机分为实验组和对照组,每组10只。实验组大鼠灌胃甘草酸5 mg/kg,对照组灌胃等量的0.5%羧甲基纤维素钠溶液,每日1次,连续给药14 d,第14天灌胃30 min后,2组大鼠均灌胃硝苯地平3 mg/kg,并于灌胃硝苯地平前与灌胃后0.25、0.5、0.75、1、1.5、2、3、4、6、8、12、24 h眼内眦静脉丛采血0.5 mL。采用高效液相色谱法,以地西泮为内标,测定其中硝苯地平的浓度;色谱柱为ODS-C18;流动相为甲醇-水(62 ∶ 38,V/V,乙酸调pH为4.5);流速为1.0 mL/min;柱温为30 ℃;检测波长为238 nm;进样量为20 μL。使用Winonlin 6.0软件计算药动学参数,t检验进行统计分析。结果:实验组和对照组大鼠体内硝苯地平的主要药动学参数tmax分别为(1.40±0.15)、(1.50±0.01) h;cmax分别为(0.15±0.03)、(0.29±0.09) mg/L;t1/2分别为(4.70±1.17)、(5.20±1.38) h;AUC0-24 h分别为(1.00±0.10)、(1.89±0.37) mg·h/L;AUC0-∞分别为(1.00±0.16)、(1.98±0.32) mg·h/L;MRT分别为(6.76±0.64)、(6.60±1.36) h。与对照组比较,实验组大鼠体内硝苯地平的cmax、AUC0-24 h、AUC0-∞均明显降低,差异具有统计学意义(P<0.05)。结论:甘草酸可能会降低硝苯地平在大鼠体内的生物利用度,两药联用时建议增加硝苯地平的剂量以达到有效的血药浓度。
ABSTRACT: OBJECTIVE: To study the effects of glycyrrhizic acid on the pharmacokinetics of nifedipine in rats. METHODS: Rats were randomly divided into experimental group and control group, with 10 rats in each group. Experimental group was given glycyrrhizic acid 5 mg/kg and control group was given 0.5% CMC-Na (sodium carboxymethylcellulose) solution, once a day, for 14 consecutive days. On 14th day after 30 min of intragastric administration, both groups were given nifedipine 3 mg/kg intragastrically. Blood samples 0.5 mL were collected from intraocular vein plexus before and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12 and 24 h after intragastric administration. The concentration of nifedipine was determined by HPLC using diazepam as internal standard. The determination was performed on ODS-C18 column with mobile phase consisted of methanol-water (62 ∶ 38,     V/V,pH adjusted to 4.5 with acetic acid) at the flow rate of 1.0 mL/min. The column temperature was 30 ℃. The detection wavelength was set at 238 nm, and sample size was 20 μL. The pharmacokinetic parameters were calculated with Winonlin 6.0 software, and statistical analysis was performed by t-test. RESULTS: The main pharmacokinetic parameters of the experimental group and the control group were as follows as tmax was (1.40±0.15), (1.50±0.01) h; cmax was (0.15±0.03), (0.29±0.09)      mg/L; t1/2 was (4.70±1.17), (5.20±1.38) h; AUC0-24 h were (1.00±0.10), (1.89±0.37) mg·h/L; AUC0-∞ was (1.00±0.16), (1.98±0.32) mg·h/L; MRT was (6.76±0.64), (6.60±1.36) h, respectively. Compared with control group, cmax, AUC0-24 h and AUC0-∞ of nifedipine were decreased significantly in experimental group, with statistical significance (P<0.05). CONCLUSIONS: Glycyrrhizic acid can reduce the bioavailability of nifedipine in rats. It is suggested that the dosage of nifedipine should be increased in order to achieve effective blood concentration.
期刊: 2019年第30卷第21期
作者: 毛俊,朱项羽,夏宏光,王志豪,刘慧茹,江海燕,金涌
AUTHORS: MAO Jun,ZHU Xiangyu,XIA Hongguang,WANG Zhihao,LIU Huiru,JIANG Haiyan,JIN Yong
关键字: 甘草酸;硝苯地平;地西泮;高效液相色谱法;药动学;大鼠
KEYWORDS: Glycyrrhizic acid; Nifedipine; Diazepam; HPLC; Pharmacokinetics; Rat
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