Wool products are widely used in people's daily life due to their various excellent properties. However, long-term exposure to solar radiation containing ultraviolet light (UV) can cause severe photoyellowing issues. Also, when used to fabricate apparel, fabrics are expected to own an outstanding UV-blocking feature to protect the skin underneath. In this study, we have developed an eco-friendly treatment to reduce the photoyellowing as well as improve UV-blocking capacity of wool fabrics by introducing para-aminobenzoic acid (PABA) through a microbial transglutaminase (mTGase) mediated acyl transfer reaction in a tris(hydroxymethyl)aminomethane-hydrochloric acid (Tris-HCl) buffer at mild condition. Fluorescent and UV–Vis reflectance spectra proved the successful attachment of PABA on wool fabrics. In addition, relative properties measured after laundering demonstrated the existence of strong covalent bonds, which ensure the stable performance of corresponding fabrics. Moreover, we found that wool fabrics processed by an appropriate concentration of PABA in the enzyme-tris reaction system could effectively resist photoyellowing and exhibit dramatic improvement of UV protection factor (UPF) values. Tensile test results indicated some improvement in the mechanical performance of the treated fabrics after long-term accelerated irradiation. The feasible and effective method developed in current research has great potential to improve the durability and performance of wool products.

羊毛产品因其各种优异的性能而广泛用于人们的日常生活中。但是，长期暴露于含有紫外线（UV）的太阳辐射下会导致严重的黄变问题。另外，当用于制造服装时，期望织物具有出色的防紫外线功能，以保护下面的皮肤。在这项研究中，我们开发了一种生态友好的处理方法，可通过微生物转谷氨酰胺酶（mTGase）介导的酰基转移反应引入对氨基苯甲酸（PABA），从而减少羊毛织物的光致泛黄并提高其紫外线阻隔能力。 （羟甲基）氨基甲烷-盐酸（Tris-HCl）缓冲液，温度适中。荧光和UV-Vis反射光谱证明了PABA在羊毛织物上的成功附着。此外，洗涤后测得的相对性能表明存在强共价键，可确保相应织物的稳定性能。此外，我们发现在酶-tris反应体系中用适当浓度的PABA处理的羊毛织物可以有效地抵抗光致泛黄，并显着提高UV保护因子（UPF）值。拉伸试验结果表明，经过长期加速辐照后，经处理的织物的机械性能有所改善。当前研究开发的可行有效的方法在改善羊毛制品的耐久性和性能方面具有巨大的潜力。我们发现，在酶-tris反应体系中，通过适当浓度的PABA加工的羊毛织物可以有效抵抗光泛黄，并显着提高UV保护因子（UPF）值。拉伸试验结果表明，经过长期加速辐照后，经处理的织物的机械性能有所改善。当前研究开发的可行有效的方法在改善羊毛制品的耐久性和性能方面具有巨大的潜力。我们发现，在酶-tris反应体系中，通过适当浓度的PABA加工的羊毛织物可以有效抵抗光泛黄，并显着提高UV保护因子（UPF）值。拉伸试验结果表明，经过长期加速辐照后，经处理的织物的机械性能有所改善。当前研究开发的可行有效的方法在改善羊毛制品的耐久性和性能方面具有巨大的潜力。