Chinese Journal of Tissue Engineering Research ›› 2022, Vol. 26 ›› Issue (22): 3535-3542.doi: 10.12307/2022.282
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Liu Liang1, 2, 3, Hu Gaoquan1, 2, 3, Wei Zhao1, 2, 3, Chen Lin1, 2, 3, Hong Feng1, 2, 3
Received:
2020-11-20
Revised:
2021-01-16
Accepted:
2021-05-23
Online:
2022-08-08
Published:
2022-01-12
Contact:
Hong Feng, Professor, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China; Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Donghua University, Shanghai 201620, China; Scientific Research Base of Bacterial Nanofiber Manufacturing and Composite Technology, China Textile Engineering Society, Shanghai 201620, China
About author:
Liu Liang, Master, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China; Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Donghua University, Shanghai 201620, China; Scientific Research Base of Bacterial Nanofiber Manufacturing and Composite Technology, China Textile Engineering Society, Shanghai 201620, China
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CLC Number:
Liu Liang, Hu Gaoquan, Wei Zhao, Chen Lin, Hong Feng. Potential of bacterial nanocellulose/polydopamine composite tubes as small-diameter artificial blood vessel[J]. Chinese Journal of Tissue Engineering Research, 2022, 26(22): 3535-3542.
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根据Image J软件统计纤维直径的数据可知,与细菌纳米纤维素管相比,BNC/PDA复合管的纤维直径增大,且随多巴胺溶液质量浓度的增加纤维直径增大。其中细菌纳米纤维素管的直径为37.7 nm,而BNC/PDA-2.0复合管的直径增大至60.6 nm。 2.3 细菌纳米纤维素管及BNC/PDA复合管的傅里叶红外光谱图分析 由图3a可以看出细菌纳米纤维素管的特征吸收峰,红外谱图中 3 600-3 100,1 330,1 250-850 cm-1处的吸收峰分别对应细菌纤维素上O-H、C-H和C-O 的伸缩振动。在BNC/PDA复合管上仍有细菌纳米纤维素管的特征吸收峰,但是在3 000-3 500 cm-1出现了宽带,见图3b-f,那是由多巴胺分子中存在分子间氢键O-H伸缩振动或是由芳香族仲胺 N-H 伸缩振动引起的[27]。而在1 640 cm-1处的吸收峰对应的是酰胺Ⅰ键C=O的伸缩振动[10]。这些结果从官能团角度证明了聚多巴胺的成功涂覆。"
细菌纳米纤维素管、BNC/PDA-0.1、BNC/PDA-0.5、BNC/PDA-1.0、BNC/PDA-1.5和BNC/PDA-2.0复合管的爆破压分别为(61.2±3.5),(62.0±3.1),(72.0±2.0),(74.8±2.3),(75.7±2.7)和(78.0±2.4 ) kPa,缝合强度分别为(0.53±0.04),(0.55±0.03),(0.77±0.03),(0.78±0.04),(0.79±0.05)和(0.85±0.04) N。可以看出,与细菌纳米纤维素管相比,BNC/PDA复合管的爆破压增大,但是细菌纳米纤维素管和BNC/PDA-0.1复合管间的爆破压比较差异无显著性意义(P > 0.05);聚多巴胺复合量越大管的爆破压也越大,但是BNC/PDA-1.0和BNC/PDA-1.5复合管间的爆破压比较差异无显著性意义(P > 0.05)。细菌纳米纤维素管与BNC/PDA-0.1复合管的缝合强度比较差异无显著性意义(P > 0.05);BNC/PDA-0.5、BNC/PDA-1.0、BNC/PDA-1.5和BNC/PDA-2.0复合管的缝合强度均明显增加,但是BNC/PDA-0.5、BNC/PDA-1.0、BNC/PDA-1.5复合管之间比较差异无显著性意义(P > 0.05)。 2.7 细菌纳米纤维素管及BNC/PDA复合管的轴向拉伸力学测试结果 表2列出了细菌纳米纤维素管和BNC/PDA复合管的杨氏模量、拉伸强度及断裂伸长率,可以看出随着聚多巴胺复合量的增加,管的杨氏模量、拉伸强度和断裂伸长率均增加,这表明聚多巴胺的复合可以提升细菌纳米纤维素管的轴向力学性质。但是细菌纳米纤维素管与BNC/PDA-0.1复合管之间的杨氏模量比较差异无显著性意义(P > 0.05),BNC/PDA-1.0与BNC/PDA-1.5复合管之间的断裂伸长率比较差异无显著性意义(P > 0.05)。"
2.8 细菌纳米纤维素管及BNC/PDA复合管的血液相容性 图6A显示了细菌纳米纤维素管和BNC/PDA复合管的血小板黏附状况,可以看出纯细菌纳米纤维素管上黏附了大量的血小板,并且呈絮状聚集在一起,唐敬玉等[28]的研究也表明,血小板容易黏附在细菌纳米纤维素上且相互聚集形成血小板栓子。然而BNC/PDA复合管上血小板的黏附量显著减少,并且比较分散,激活程度较小。 图6B显示了细菌纳米纤维素管和BNC/PDA复合管的溶血率,结果显示细菌纳米纤维素管的溶血率为0.07%,复合聚多巴胺后的溶血率略微提高,BNC/PDA-0.1、BNC/PDA-0.5、BNC/PDA-1.0、BNC/PDA-1.5和BNC/PDA-2.0复合管的溶血率分别为(0.17±0.01)%,(0.15±0.01)%,(0.19±0.02)%,(0.11±0.02)%和(0.12±0.02)%。 全血凝固实验可以直观地评价材料的致凝血性能。图6C展示了兔全血与细菌纳米纤维素管和BNC/PDA复合管接触后的凝血过程,细菌纳米纤维素管导致血液在45 min内凝固,吸光度持续下降;BNC/PDA复合管同样导致了凝血的发生,并且其凝血程度大于纯细菌纳米纤维素管,在5-45 min内吸光度值均低于相应时刻内细菌纳米纤维素管的吸光度值,但是不同聚多巴胺复合量的BNC/PDA复合管之间的全血凝固结果无明显差异。"
2.9 细菌纳米纤维素管及BNC/PDA复合管的细胞相容性 图7A是人脐静脉内皮细胞在各样品管上培养1,3,5 d后的钙黄绿素荧光染色结果,可以看出基本趋势与CCK-8实验结果一致。在整个培养周期内,细菌纳米纤维素管、BNC/PDA-0.1、BNC/PDA-0.5以及BNC/PDA-1.0复合管上的细胞持续增殖,到第5天时细胞在这些材料上已经成簇铺展开,与细菌纳米纤维素管上的细胞相比,BNC/PDA-0.1复合管上细胞更多,而BNC/PDA-0.5及BNC/PDA-1.0复合管上的细胞较少。在整个培养周期,BNC/PDA-1.5和BNC/PDA-2.0复合管上的细胞没有增殖,荧光最弱,尤其到第3天和第5天基本看不到荧光。 图7B显示人脐静脉内皮细胞在样品管上培养1,3,5 d后的CCK-8实验结果,可以看出在第1天时,细菌纳米纤维素管与BNC/PDA-0.1、BNC/PDA-0.5及BNC/PDA-1.0复合管之间细胞数量无明显差异,但是BNC/PDA-1.5和BNC/PDA-2.0复合管上的细胞数量较少;随着培养时间的延长,细菌纳米纤维素管、BNC/PDA-0.1、BNC/PDA-0.5和BNC/PDA-1.0复合管上的细胞持续增殖,但增殖趋势不同,与细菌纳米纤维素管相比,BNC/PDA-0.1复合管上第3,5天的细胞数量较多,而BNC/PDA-0.5和BNC/PDA-1.0复合管上的细胞数量较少,第3天时细菌纳米纤维素管与BNC/PDA-0.5复合管上的细胞数量无明显差异。在整个5 d的培养过程中,BNC/PDA-1.5和BNC/PDA-2.0复合管上的细胞没有表现出增殖结果。"
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