Abstract
Many organic compounds that absorb ultraviolet radiation can act as powerful reducing agents when irradiated in the ultraviolet. Such irradiation in the presence of azo dyes can lead to the photoreduction of the dyes. It is shown that simple ketyl radicals have strong reducing properties and can reduce azo dyes. It is demonstrated that similar radicals produced from glucose also act as reducing agents. The structural relation between glucose and cellulose suggests that the photoreduction can also play a role in the photofading of azo dyes on cellulosic textile materials.
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