Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (25): 3956-3963.doi: 10.12307/2023.459
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Li Shaoping1, Yang Yuqing1, Xiao Wenyundeng1, Yin Lulu2, Liu Libo2, Liu Ying2, Sun Yifan2, Chen Zhiyu1
Received:
2022-06-15
Accepted:
2022-07-18
Online:
2023-09-08
Published:
2023-01-17
Contact:
Chen Zhiyu, PhD, Department of Prosthodontics, School of Stomatology · Hospital of Stomatology, Hebei Medical University, Hebei Provincial Key Laboratory of Stomatology, Hebei Provincial Clinical Research Center for Oral Diseases, Shijiazhuang 050017, Hebei Province, China
About author:
Li Shaoping, Master candidate, Department of Prosthodontics, School of Stomatology · Hospital of Stomatology, Hebei Medical University, Hebei Provincial Key Laboratory of Stomatology, Hebei Provincial Clinical Research Center for Oral Diseases, Shijiazhuang 050017, Hebei Province, China
Supported by:
CLC Number:
Li Shaoping, Yang Yuqing, Xiao Wenyundeng, Yin Lulu, Liu Libo, Liu Ying, Sun Yifan, Chen Zhiyu. Preparation and characterization of nano-hydroxyapatite/aspirin/polyvinyl alcohol/gelatin/sodium alginate hydrogel scaffolds[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(25): 3956-3963.
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2.3 水凝胶支架的傅里叶红外光谱分析 明胶的特征吸收峰酰胺Ⅰ带(C=O的伸缩振动峰)、酰胺Ⅱ带(N-H的弯曲振动峰)、酰胺Ⅲ带(C-N的伸缩振动峰)分别位于1 627,1 521,1 234 cm-1。聚乙烯醇的特征吸收峰位于3 273,2 904,1 085 cm-1处,分别为O-H、C-O伸缩振动和C-H的伸缩振动峰。海藻酸钠位于1 751 cm-1处的特征吸收峰为C=O的伸缩振动峰,在1 600 cm-1处为COO-的反对称收缩峰、1 410 cm-1处为对称收缩峰。阿司匹林的特征吸收峰为O-H、C=O和C=C的伸缩振动峰,分别位于3 490,1 750,1 605 cm-1处。在0%纳米羟基磷灰石组水凝胶支架的红外光谱中,O-H峰位移到3 277 cm-1处,宽度明显增加,1 627 cm-1处(酰胺Ⅰ带)的峰明显增宽,1 521 cm-1处(酰胺Ⅱ带)的峰蓝移至1 550 cm-1处以及阿司匹林、海藻酸钠在指纹区的微弱小峰在水凝胶支架中的消失证实了聚乙烯醇、明胶、海藻酸钠、阿司匹林之间相互作用并形成氢键[13,20];海藻酸钠中C=O吸收峰从1 751 cm-1处移动至1 734 cm-1处变成微弱的小峰,证明了海藻酸钠与明胶之间强烈的静电引力[21-22];海藻酸钠中COO-由1 400 cm-1移动至1 413 cm-1处,证明Ca2+与COO-化学交联形成蛋壳结构[23],见图4。纳米羟基磷灰石的特征吸收峰为PO43-的伸缩振动峰,位于1 024 cm-1和965cm-1处,以及PO43-的变形振动峰,位于603,555 cm-1处,-OH伸缩振动峰为3 600 cm-1处、弯曲振动峰为633 cm-1处。水凝胶支架中加入纳米羟基磷灰石后,在603,555 cm-1处出现了纳米羟基磷灰石特征峰,965 cm-1处特征峰消失、1 024 cm-1处峰值红移至1 019 cm-1处且峰增宽这可能由于纳米羟基磷灰石中的PO43-(1 024 cm-1)与聚乙烯醇发生相互作用形成氢键[24],见图4。因此聚乙烯醇、海藻酸钠、明胶、阿司匹林、纳米羟基磷灰石之间存在着物理和化学双交联的形式,但未出现成分的丢失,加入纳米羟基磷灰石可以使支架更加紧密、提高机械性能、持续缓慢释放药物,使支架能够适应和调节骨缺损修复的微环境。"
2.7 各组水凝胶支架的溶胀性能分析 0%,10%,20%纳米羟基磷灰石组水凝胶支架在前4 h快速溶胀,4 h后溶胀曲线平缓,分别于4,10,16 h达到溶胀平衡,平衡溶胀率分别为(397.71±1.28)%,(349.18±6.34)%和(257.45±7.86)%,各组之间比较差异有显著性意义(P < 0.05),见图9A。随着纳米羟基磷灰石质量分数的增高,溶胀率依次降低,但各组支架均具有良好的溶胀性能。 2.8 各组水凝胶支架的降解性能分析 各组水凝胶支架的降解率随着时间延长,呈增加趋势,0%纳米羟基磷灰石组水凝胶支架第21天的降解率为(82.33±0.77)%,第28天支架结构崩解,降解率为100%;加入纳米羟基磷灰石后水凝胶支架降解速率显著下降,10%,20%纳米羟基磷灰石组第28天的降解率分别为(41.04±0.03)%,(29.99±0.17)%,各组之间比较差异有显著性意义(P < 0.05),见图9B。结果表明,水凝胶支架加入纳米羟基磷灰石可显著降低降解速率,并与骨组织再生速度相匹配。"
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