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Chromaticity and color saturation of ultraviolet irradiated poly(vinyl alcohol)-anthocyanin coatings

机译：紫外线辐照的聚乙烯醇-花青素涂料的色度和色饱和度

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摘要

The purpose of this paper is to evaluate the chromaticity and color saturation of anthocyanin extraction from fruit pericarps of Ixora siamensis in a poly(vinyl alcohol) (PVA) matrix. The colored PVA matrix was exposed to UV-B irradiation for 93 days at UV intensity of 17.55 lux. Anthocyanin colorant has been extracted using methanol acidified with 0.5% trifluoroacetic acid (TFA). Different concentrations of ferulic acid (FA) (0, 1, 2, 3, 4 and 5 wt.%) have been added to the anthocyanin extractions before mixing with PVA to form a coating system. The PVA-anthocyanin-FA mixtures have been coated on glass slides and kept overnight in the dark for curing before exposure to UV-B irradiation. The FA-free sample undergoes more color degradation compared to samples containing FA. The coating with 2% FA has the most stable color with chromaticity of 41% and color saturation of 0.88 compared to other FA containing coats. The FA-free coat exhibits 29% chromaticity and color saturation of 0.38 at the end of the experiment. (C) 2015 Elsevier B.V. All rights reserved.
机译：本文的目的是评估聚乙烯醇（PVA）基质中从暹罗I果皮中提取花色苷的色度和颜色饱和度。将有色的PVA基质在17.55勒克斯的UV强度下暴露于UV-B辐射93天。花青素着色剂已用0.5％三氟乙酸（TFA）酸化的甲醇萃取。在与PVA混合形成涂层系统之前，已将不同浓度的阿魏酸（FA）（0、1、2、3、4和5 wt。％）添加到花色苷提取物中。 PVA-花青素-FA混合物已涂在载玻片上，并在黑暗中过夜，以便在暴露于UV-B辐射之前固化。与含FA的样品相比，不含FA的样品的颜色降解程度更大。与其他含FA的涂料相比，含2％FA的涂料具有最稳定的颜色，色度为41％，色饱和度为0.88。在实验结束时，不含FA的涂层表现出29％的色度和0.38的色彩饱和度。 （C）2015 Elsevier B.V.保留所有权利。

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