This study reported a facile and sustainable modification of cellulose by plant tannins and chitosan polymer for higher impregnation of UV protective natural chromophores (UVPNCs) derived from the banana floral stem (BFS). The phytochemical screening demonstrated that BFS extracts have different UVPNCs including condensed tannin, flavonoids, anthocyanin, betacyanin and anthraquinone. The optimized impregnation temperature and time for UVPNCs entrapping were found at 80$°C$ with a time interval of 60 min and the overall inherent fixation rate of UVPNCs was ranging from 53 to 63%. The cellulose substrate templated with plant tannins (extracted from Terminalia chebula and Phyllanthus emblica) and chitosan improved the UVPNCs absorption amount almost 2 and 1.8 folds, respectively, which was expressed in terms of color strength (K/S). Interestingly, the UVPNCs entrapping ability of bio-crosslinked cellulose was also higher than typical metallic salts treated cellulose. The higher absorption mechanism of UVPNCs for tannins (-OH and –COOH) and chitosan (-NH₂) templating have been discussed in terms of molecular orientation (TCI, LOI), inter and intra-molecular hydrogen bonding configuration (HBI, E_H, R), and the total amount of anchored-UVPNCs which was expressed by the asymmetric factor (AF). The UV shielding property of the UVPNCs impregnated modified cellulose was compared and a maximum of two folds higher UPF value was found in bio-templated cellulose substrate (UPF range = 223 to 459) than metal treated cellulose substrates (UPF range = 163 to 175). Furthermore, the functional durability of UVPNCs impregnated substrates was evaluated in terms of several colorfastness and found very good to excellent grading.

这项研究报告了植物丹宁酸和壳聚糖聚合物对纤维素的简便且可持续的改性，以更高程度地浸渍衍生自香蕉花梗（BFS）的紫外线保护性天然发色团（UVPNC）。植物化学筛选表明，BFS提取物具有不同的UVPNC，包括缩合的单宁，类黄酮，花色苷，甜菜碱和蒽醌。发现UVPNC的最佳浸渍温度和时间为80$摄氏$时间间隔为60分钟，UVPNC的整体固有固定率为53％至63％。以植物丹宁酸为模板的纤维素底物（从Terminalia chebula和余甘子）提取和壳聚糖，分别提高了UVPNCs吸收量近2倍和1.8倍，以色强度（K / S）表示。有趣的是，生物交联纤维素的UVPNC截留能力也高于典型的金属盐处理过的纤维素。已经就分子取向（TCI，LOI），分子间和分子内氢键构型（HBI，E _H）讨论了UVPNC对单宁（-OH和-COOH）和壳聚糖（-NH ₂）模板的更高吸收机理。，R），以及由不对称因子（AF）表示的锚定UVPNC的总量。比较了UVPNCs浸渍的改性纤维素的紫外线屏蔽性能，发现生物模板化纤维素底物（UPF范围= 223至459）中的UPF值最多比金属处理的纤维素底物（UPF范围= 163至175）高两倍。 。此外，用几种色牢度评估了UVPNC浸渍基材的功能耐久性，发现非常好至极佳的分级。