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A modification of Jansen's method for the estimation of aneurin in different substances by converting the aneurin to thiochrome is described It consists in carrying out the oxidation of aneurin in an atmosphere of carbon dioxide and later on in estimating the thiochrome by means of analysis with quartz lamp and Pulfrich's photometer. The results agree with the findings of other workers using Cohen fluorometer.doi:10.5281/zenodo.6619147 fatcat:fqx5yzxgmbdzxbnq7vq2zqdvzy