Abstract
ABSTRACT Shifts of selective reflection peaks under UV irradiation (which can be observed as color changes) are reported for induced cholesteric systems (nematic + optically active dopant) additionally doped with ergosterol (provitamin D2) or 7-dehydrocholesterol (provitamin D3). the effect is based on the photoinduced conversion of ergosterol into vitamin D2, and 7-dehydrocholesterol into vitamin D3, with the vitamins and provitamins having opposite signs of their helical twisting power. The observed shifts of the selective reflection peaks (more than 190 nm after 45 min of UV irradiation) allow both instrumental and visual monitoring of biologically active UV radiation.
Published Version
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