Abstract
The influence of temperature on the spectroscopic properties of powders and aqueous solutions of riboflavin was studied using NMR, linear dichroism, IR and UV absorption spectroscopy, and luminescence. It was found that exposure of riboflavin powders over a wide temperature range (290–423 K) did not change significantly its properties and spectral characteristics. The absorbance and fluorescence of aqueous solutions of riboflavin decreased under the same conditions due to riboflavin thermal destruction. The fraction of destroyed molecules in aqueous solutions of riboflavin was in the range 4–28% and depended on the drug concentration and thermal conditions.
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