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Stabilization of Natural Dyes by High Levels of Antioxidants

机译：高水平抗氧化剂稳定天然染料

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Natural dyes are normally unstable to photooxidation by UV light. We have measured the stability of a number of natural dyes in combination with high concentrations of antioxidants, excited state quenchers, and UV absorbers. We find that certain combinations, including indigo/BHT, methylene blue/p-benzoquinone, and methylene blue/triethylamine show enhanced stability in solution and/or in thin polymer films. By comparing solutions and films of the mixed components with solutions and films of the antioxidant placed between the dye and UV source, we can show that the effect is not UV screening but is due to some form of intermolecular chemistry. We believe that this effect may account for the high stability of natural dyes in plant tissues, such as the skins of fruit, and may be usable to stabilize natural dyes in foods or textiles, especially if suitable nanoparticle structures can be developed.
机译：天然染料通常对紫外光的光氧化通常不稳定。我们已经测量了许多天然染料的稳定性与高浓度的抗氧化剂，激发态猝灭剂和UV吸收剂组合。我们发现某些组合，包括靛蓝/ BHT，亚甲基蓝/ p-苯并醌和亚甲基蓝/三胺显示出溶液和/或薄聚合物薄膜的增强稳定性。通过将混合组分的溶液和薄膜与放置在染料和紫外源之间的抗氧化剂的溶液和薄膜进行比较，我们可以表明效果不是紫外线筛选，而是由于某种形式的分子间化学。我们认为，这种效果可能考虑植物组织中天然染料的高稳定性，例如水果的皮肤，并且可以使用稳定食品或纺织品中的天然染料，特别是如果可以开发合适的纳米粒子结构。

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