Abstract
A simple method detecting thiamine in enriched flour has been developed for controlling homogeneous addition of thiamine to flour at mills. By scattering flour through sieve, a thin film of it on a sheet of filter paper is prepared and wetted with alcohol. The filter paper is turned inside out, stripped off from the flour and sprayed with an alkaline ferricyanide solution. Bringing it immediately under ultraviolet ray, thiamine crystals enriched are easily detected as thiochrome spots on the paper and the number of them on a definite area of the sheet is indicative of thiamine enrichment, although it does not represent the thiamine content exact proportionally.
