Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (12): 1870-1876.doi: 10.12307/2023.017
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Ma Ziyu1, Zhang Bin2, Zhang Yuntao2, Liu Xiaolin1, Bian Zhihong1, Qiao Luhui3, Hou Yudong4
Received:
2021-11-25
Accepted:
2022-01-05
Online:
2023-04-28
Published:
2022-07-30
Contact:
Hou Yudong, Master, Professor, School of Stomatology, Binzhou Medical College, Yantai 264010, Shandong Province, China
Zhang Bin, Master, Affiliated Hospital of Binzhou Medical College, Binzhou 256600, Shandong Province, China
About author:
Ma Ziyu, Master candidate, Binzhou Medical College, Binzhou 256600, Shandong Province, China
CLC Number:
Ma Ziyu, Zhang Bin, Zhang Yuntao, Liu Xiaolin, Bian Zhihong, Qiao Luhui, Hou Yudong. Effects of quercetin sustained release system on osteogenic properties of MC3T3-E1 cells[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(12): 1870-1876.
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透射电镜观察结果:载有槲皮素的纳米微球呈圆形,外面有一壳聚糖层包绕,微球与微球之间分散,粒径大小较一致,基本不粘连。聚己内酯纳米纤维表面光滑,直径均匀。聚己内酯/聚乙二醇纳米纤维由于聚乙二醇的加入表面相对不平整,直径均匀。聚己内酯/聚乙二醇/槲皮素微球纳米纤维表面光滑,直径不均匀,能看到微球的影像纺入了静电纺丝中。 扫描电镜观察结果:载药纳米微球呈现出规则的球形,表面相对光滑,直径较均匀。聚己内酯纳米纤维支架由丝状结构相互堆叠形成,聚己内酯纳米纤维直径均匀,表面光滑,无断裂。聚己内酯/聚乙二醇和聚己内酯/聚乙二醇/槲皮素微球纳米纤维表面相对不平整,可能是聚乙二醇与微球的加入所导致,纳米纤维不规则交织成网状结构,形成大小不一的孔隙,增加了支架材料的比表面积,且能便于营养物质与代谢产物的进出,为细胞的附着与生存提供了足够的空间和良好的环境。 2.2 纳米纤维支架的静态接触角 见图3。 "
图3为去离子水滴在纳米纤维支架薄膜上2 s后所拍摄的图片,聚己内酯组2 s后的静态接触角为123.1°,聚己内酯/聚乙二醇组2 s后的静态接触角为16.2°,聚己内酯/聚乙二醇/槲皮素微球组2 s后的静态接触角为6.1°。可以看出,聚己内酯/聚乙二醇组的静态接触角相对于聚己内酯组显著减小,说明液滴大部分渗透入纤维材料中,证明聚乙二醇发挥了它的亲水性的优点,显著增加了材料的亲水性能;聚己内酯/聚乙二醇/槲皮素微球组的静态接触角小于聚己内酯/聚乙二醇组,可能微球的加入增大了纤维的粗糙程度或孔隙率,从而进一步改善了材料的亲水性。 2.3 槲皮素标准曲线及回归方程 以无水乙醇溶液作为空白对照组,归零后,测定每种槲皮素乙醇溶液在375 nm处的吸光度值,以Y轴作为吸光度值,X轴作为浓度,绘制标准曲线图,如图4所示,并得出回归方程为:Y=0.067 33×X+0.011 53,R2=0.991 9,表明药物质量浓度在2-12 mg/L之内,呈现良好的线性关系。 "
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