您好, 访客   登录/注册

阿司匹林缓释微球的制备及其体内外释放规律的研究

来源:用户上传      作者:

  【摘 要】目的:制备阿司匹林缓释微球并研究其体内外释放规律。方法:采用乳化溶剂挥发法制备阿司匹林缓释微球,采用动态透析法测定其体外释放度,通过大鼠药动学实验研究其体内释药规律。结果:制备的缓释微球圆整光滑,粒径分布均匀,平均载药量为51.6%,平均包封率为89.4%,最大吸收浓度为0.344ug/ml,平均滞留时间为228.12h,体内外相关性良好。结论:微球在大鼠体内有明显的缓释作用,可在较长时间内维持一定的血药浓度,达到了预期的目的。
  【关键词】阿司匹林;缓释微球;乳化溶剂挥发法;药动学
  Study on the preparation of aspirin sustained release microspheres and the release law of the body and the body
  Abstract Objective:to prepare aspirin sustained-release microspheres and study its internal and external release.Methods:the emulsion solvent evaporation method preparation of aspirin sustained-release microspheres,by dynamic dialysis method was used to determine the in vitro release,the rat experimental kinetic research on the in vivo release drug laws.Results:the sustained release microspheres were round and smooth,with uniform particle size distribution,the average loading dose was 89.4%,the average encapsulation efficiency was 51.6%,the maximum absorption concentration was 0.344ug/ml,the correlation between the body and the body was good.Conclusion:the microspheres in the large number of the slow release effect,can maintain a certain blood concentration in a long time,to achieve the desired purpose.
  Key words:aspirin sustained release microspheres,emulsion solvent evaporation,pharmacokinetics
  阿司匹林是目前临床上应用较广泛的解热镇痛药之一,具有解热、镇痛、抗炎、抗风湿和抗血小板聚集等多方面的药理作用,口服后易吸收,在全身组织分布广,作用强,但普通的阿司匹林口服后在体内水解成水杨酸,直接剌激胃黏膜引起上腹不适及恶心呕吐[1]。长期使用易致胃黏膜损伤,引起胃溃疡及胃出血。为了减少患者的服药次数,降低胃肠道的不良反应,使血药浓度平稳持久避免谷峰现象,提高患者的依从性,可将其制成缓释微球,有效降低药物的毒副作用,延长药物的代谢时间,还可以大大地提高药物的生物利用率[2]。
  Aspirin is currently one of antipyretic analgesics is widely used clinically,has the pharmacological effect of antipyretic,analgesic,anti-inflammatory,anti rheumatism and antiplatelet aggregation etc.,after oral administration of easy absorption,wide distribution in the tissues of the body,strong interaction,but ordinary aspirin Linkou service after in vivo hydrolysis into salicylic acid,direct stimulation of gastric mucosa caused by abdominal discomfort and nausea and vomiting.The long-term use may cause injury of gastric mucosa,causing gastric ulcer and gastric bleeding.In order to reduce the number of patients with medication,reduce adverse reaction of gastrointestinal tract,stable and durable to avoid the phenomenon of trough to peak plasma concentration,improve patient compliance,can be made into sustained-release microspheres,reduce drug toxicity and side effect and prolong the time of drug metabolism,can also greatly improve the bioavailability of drugs.   图4 血药浓度-时间曲线(0-12h)
  图5 血药浓度-时间曲线(1-13d)
  表2 主要药动学参数
  参数 单位 阿司匹林缓释微球 阿司匹林原料药
  最大吸收溶度Cmax
  最大吸收时间Tmax
  T1/2
  平均滞留时间 ug/ml
  h
  h
  h 0.344
  8.109
  9.049
  228.12 0.712
  4.325
  3.631
  19.628
  由图4、图5及表2可以看出,阿司匹林缓释微球组缓释作用明显,在一定时间内可以维持相对平稳的血药浓度,药物在体内的平均滞留时间达10天,表明药物在体内缓慢释放。
  3.3 体内外相关性评价
  将体内Fa与体外相应时间点Fa进行比较,阿司匹林缓释微球进入体内后,药物缓慢释放、吸收。体内外相关性评价见表3。
  表3 体内外相关性评价(p<0.01)
  天数 体外累积释放率(%) 体内累积收率(%) r F
  1
  3
  5
  7
  9
  11 12.95
  21.47
  25.23
  40.11
  53.15
  84.25 47.04
  53.27
  59.81
  67.49
  75.15
  82.81
  0.9779
  30.25
  3 讨论
  本文采用乳化溶剂挥发法制备了阿司匹林缓释微球,并对其包封率、载药量及其体外释放度进行了考察,通过大鼠对其进行了药动学研究。结果表明,缓释微球的平均包封率达89%,平均载药量为51.6%,体外释放度和体内收率之间有显著地相关性,与阿司匹林原料药相比,缓释微球具有明显的缓释作用,血药浓度的达峰时间也明显延长。
  参考文献:
  [1]郭英,李酽,谢静,蔡娇.阿司匹林壳聚糖纳米缓释微球的制备及体外释放性能的研究[J].化学世界,2007,01:38-41+48.
  [2]何爱明,林世明,赖双光,王四英.阿司匹林壳聚糖微球的研制及药动学参数测定[J].复旦学报(医学版),2007,03:463-464.
  [3]符旭东,高永良,平其能.石杉碱甲缓释微球的制备及其在大鼠体内的药动学与药效学研究[J].中国药学杂志,2005,19:60-63.
  [4]罗斌华,丁洁琼,肖若蕾.格列吡嗪缓释微球的制备及释药特性考察[J].中国药物与临床,2013,02:166-167.
转载注明来源:https://www.xzbu.com/1/view-11445113.htm