Abstract
The rate of degradation of folic acid in the light and in the dark is investigated in a model buffer solution and in beer, with and without the addition of sulphur dioxide. In the model solution, held in the light, sulphur dioxide markedly accelerates the rate of degradation of folic acid whereas, in the dark, it exhibits a protective effect. In beer, the presence of sulphur dioxide has no effect on the degradation of folic acid, whether in the light or the dark. In the model solution, in the presence of sulphur dioxide, only the degradation product p-aminobenzoyl glutamic acid was identified. In the absence of sulphur dioxide and in the beer samples, pterin-6-carboxylic acid was additionally identified as a degradation product.
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