Abstract
The influence of L-histidine on the light and perspiration stability of 4,4’-diamino-stilbene-2,2’-disulfonic acid-based fluorescent whiteness agents (DSD-based FWAs) for cotton fabrics was investigated in this paper. The results indicated that the single component L-histidine accelerated the photo-discoloration of DSD-based FWAs. In the absence of L-histidine, DSD-based FWAs tended to have poor light stability in the strongly acidic condition (pH < 4), whereas they had relatively high and consistent stability under the opposite circumstance (pH > 4). However, in the presence of L-histidine solution, the light stability of DSD-based FWAs was poorer than their counterparts without L-histidine, and was enhanced linearly with the growth of pH value. Therefore, absorption actions caused by L-histidine, oxidization-related promotion for FWAs and photo-decomposition of L-histidine in the acidic condition have been proposed to analyze the comprehensive effects of L-histidine in perspiration on the light stability of DSD-based FWAs on cotton fabrics.
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