不同应用环境下异质结纺织品抗菌性能的研究
Antimicrobial properties of heterojunction textiles in different application environments
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摘要: 为探究异质结纺织品在不同应用环境下抗菌性能的变化,以大肠杆菌为代表菌,采用振荡法考查温度、pH值、光照强度和波长对其抑菌率的影响,并对其生物安全性、光催化性能和抗菌性能进行研究。结果表明:环境因素对异质结纺织品的抗菌性能具有显著影响,温度升高使其抑菌率基本呈先升高后降低趋势;pH值在3.0~8.0范围内均呈现较好的抗菌性能,当pH值为7.5时抑菌率最高,且酸性环境优于碱性环境;光照强度显著影响其抗菌性能,黑暗条件下的抑菌率较光照强度50 mW/cm2时降低了36%;随波长增加,抗菌性能降低。异质结纺织品对HaCaT细胞无明显毒性,且振荡过程中金属元素析出量均小于其实际金属元素测定值。与未处理涤纶织物相比,异质结纺织品的光催化性能显著提高;处理后的大肠杆菌形态扭曲、表面严重凹陷,PI染色荧光点数显著增加;经50次水洗后,抑菌率仍达AAA级别,具有优异的抗菌稳定性。Abstract: To explore the changes in antibacterial performance of heterojunction textiles in different application environments, Escherichia coli was used as representative bacteria to study the antibacterial rate of heterojunction textiles at different temperatures, pH, light intensity and wavelengths by the oscillation method. The results indicated that environmental factors significantly influenced the antibacterial performance of the heterojunction textiles. The bacteriostatic rate basically increased initially and then decreased with rising temperature. Within the pH range of 3.0~8.0, the heterojunction textiles exhibited strong antibacterial activity, peaking at pH 7.5, with acidic conditions being more favorable than alkaline environments. Light intensity significantly affected its antibacterial efficacy, as the bacteriostatic rate under dark conditions was 36 % lower than that at 50 mW/cm2. Additionally, antibacterial effectiveness diminished with increasing wavelength. The heterojunction textiles showed no significant cytotoxicity toward HaCaT cells, and the amounts of released metal elements during oscillation remained below the actually measured levels of metal elements. Compared to untreated polyester fabric, the heterojunction textiles demonstrated significantly enhanced photocatalytic performance. Treated Escherichia coli showed distorted morphology with severe surface depression and significantly increased PI-stained fluorescent spots. After 50 washing cycles, the bacteriostatic rate still reached the AAA level, indicating exceptional antibacterial efficacy and stability.
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