A semi‐quantitative study of willow bark dye adsorption on two different cellulose materials using biomordants was carried out. The studied celluloses were microcrystalline cellulose (MCC) AaltoCell and regenerated Ioncell‐F (IC) fibres. The dye was a hot water extract of willow bark and the adsorption to cellulose was carried out using carboxylic acid‐containing biomordants, namely, oxalic acid, citric acid and tannic acid. Alum was employed as the reference mordant. A semi‐quantitative estimation of the dye uptake was conducted using high‐performance liquid chromatography equipped with a diode array detector and also by visual inspection, as well as an evaluation of the coloration using CIELab parameters. The mechanism of the dye adsorption on the cellulose surfaces was studied via Fourier Transform–infrared spectroscopy. According to the results, MCC had a higher affinity for polyphenolic dye than the regenerated cellulose fibres. Dye uptake on MCC was 50%‐80% and 44%‐57% on IC. For MCC, the biomordants improved the dye uptake more effectively than the control mordant, alum, whereas for IC the biomordants were less effective than alum.

中文翻译：

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纤维素材料上的生物染色柳树皮染料

使用生物媒质对柳树皮染料在两种不同纤维素材料上的吸附进行了半定量研究。研究的纤维素是微晶纤维素（MCC）AaltoCell和再生的Ioncell-F（IC）纤维。该染料是柳树皮的热水提取物，使用含羧酸的生物媒质（草酸，柠檬酸和单宁酸）对纤维素进行吸附。明矾被聘为参考媒人。使用配备了二极管阵列检测器的高效液相色谱仪，还通过目视检查以及使用CIELab参数进行的着色评估，对染料吸收进行了半定量估计。通过傅里叶变换红外光谱研究了染料在纤维素表面的吸附机理。根据结果​​，MCC对多酚染料的亲和力高于再生纤维素纤维。MCC上的染料摄取量为50％-80％，IC上为44％-57％。对于MCC，生物媒质比对照媒染剂明矾更有效地改善了染料吸收，而对于IC，生物媒质的效果不如明矾。