Abstract
Thiols have been investigated to play multiple roles in photoinitiation systems (PSs), but their static quenching occurred with photosensitizers and their dimerization remain major challenges. At first, adjusting thiols with different structures proved less successful in tackling the challenges. Inspired from the biomedical field, a new attempt was designed to provide a reducing environment for thiols via introducing reducing agents. Dithiothreitol (DTT) was selected from several reducing agents owing to its great cleavage of disulfides and little damage to the PS. Kinds of characterizations indicated that the introduction of DTT not only protected thiols in the PS from oxidation to disulfide and from static quenching with photosensitizers, but also enhanced the activity of thiols. The results provided strong evidence for the superiority of DTT in promoting photoinitiation efficiency of PSs.
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