Chinese Journal of Tissue Engineering Research ›› 2022, Vol. 26 ›› Issue (34): 5475-5481.doi: 10.12307/2022.458
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Lin Lingqi1, Chen Jin1, Qian Kun2, Zhao Liang1, Shi Yijie1
Received:
2021-06-16
Accepted:
2021-08-04
Online:
2022-12-08
Published:
2022-04-15
Contact:
Shi Yijie, MD, Associate professor, School of Pharmacy, Jinzhou Medical University, Jinzhou 121001, Liaoning Province, China
About author:
Lin Lingqi, Master candidate, School of Pharmacy, Jinzhou Medical University, Jinzhou 121001, Liaoning Province, China
Supported by:
CLC Number:
Lin Lingqi, Chen Jin, Qian Kun, Zhao Liang, Shi Yijie. Preparation and in vitro release of manganese-based metal-organic framework materials loaded with baicalin[J]. Chinese Journal of Tissue Engineering Research, 2022, 26(34): 5475-5481.
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2.4 装载黄芩苷锰基金属有机骨架的表征 2.4.1 X射线衍射分析 从图2中可以看出,装载药物后,复合物在X射线衍射谱图中的衍射峰既不能与合成锰基金属有机骨架[Mn3(μ3-ade)2(OA)2]的衍射峰吻合,也不能与原始药物黄芩苷的衍射峰相吻合,基于上述结果分析可能是由于合成的锰基金属有机骨架[Mn3(μ3-ade)2(OA)2]在药物装载过程中参与了化学反应,从而导致骨架结构发生转化。 2.4.2 红外光谱分析 由图3可见,在锰基金属有机骨架的红外光谱图中,3 219 cm-1处的谱峰是骨架中-NH2的振动峰,在装载黄芩苷后该吸收峰消失,有可能是该氨基与黄芩苷中的羟基存在作用力;在游离黄芩苷的红外光谱谱图中,3 394 cm-1处对应的羟基振动峰在装载黄芩苷后也移动到3 356 cm-1处,进一步说明锰基金属有机骨架在装载黄芩苷时黄芩苷中的羟基与腺嘌呤存在相互作用,也证实了晶体结构转化的发生。 2.4.3 扫描电镜分析 由图4B可见,装载黄芩苷后,锰基金属有机骨架的形态转变为具有黄芩苷药物涂层的棒状晶体,横截面宽度为2.0-3.0 μm。装载前后的形态变化进一步支持了晶体材料发生转化的猜想。 2.4.4 X射线光电子能谱分析 药物装载后,锰基金属有机骨架的C和N峰发生变化,是由药物分子和骨架配体引起的。另一方面,基于药物装载前骨架Mn的峰位存在新的一组峰,这也证实了结构转化的发生,可以通过X射线衍射和红外光谱结果相互确认。 2.5 锰基金属有机骨架的载药率 如表1所示,当加入药物与载体质量相同时,载药率高,单纯增加载体投入量载药率会显著下降;在预实验中,增加药物投入量与药物质量至载体比为2∶1时,甚至出现药物装载失败的情况,说明最佳药物与载体质量比为1∶1,当药物与载体质量比为1∶1时,随着装载时间的延长,载药率在8 h达到峰值,药物装载达到饱和,这可能是药物吸附与解吸达到动态平衡;当装载时间延长到10 h时载药率呈现一定程度的下降,可能是吸附在晶体表面的药物因装载时间过长脱落所致,因此确定药物装载的最优条件为药物与载体质量比1∶1,装载时间8 h。"
装载黄芩苷后锰基金属有机骨架在以pH=5.8,7.4 PBS为释放介质的释药曲线中,分别在前3 h和前5 h释放较快,曲线较陡,累计释放率可达(49.52±5.04)%和(32.93±3.45)%,这是吸附在金属有机骨架表面的黄芩苷快速扩散进入释放介质造成的,在随后的十几个小时中释放曲线相对平稳,是因为装载进金属有机骨架孔道内的黄芩苷被缓慢释放出来,呈现出良好的缓释效果。 装载黄芩苷后锰基金属有机骨架在模拟酸性肿瘤微环境(pH=5.8)中比在模拟血液环境(pH=7.4)中显示出更快的药物释放模式,表明锰基金属有机骨架[Mn3(μ3-ade)2(OA)2]作为药物载体能防止药物在循环过程中渗漏过快,并增强了药物在肿瘤部位的蓄积,从而提高了其抗肿瘤疗效。 释药方程拟合结果见表2。根据拟合结果,在pH=5.8和7.4的PBS释药环境中,拟合优度最高的均为一级释药方程,拟合效果显著,释药过程符合缓释制剂一级释药动力学过程。上述结果均表明,装载黄芩苷的锰基金属有机骨架[Mn3(μ3-ade)2(OA)2]在体外释放评价中具有良好的缓释效果。"
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