[Vitamin B1 determination in ready-to-use infant food].

The authors report of a modification to the vitamin B1 determination (thiochrome method) according to the Specification TGL 18230. Extract purification is considerably simplified by using the KPS cation exchanger. The measurements were performed by means of the Spekol spectrophotometer with fluorescence attachment. In this way, also industrial laboratories with modest outfit are enable to make vitamin B1 determinations. Already after 2-3 months of storage, the thiamine values of the fruit and vegetable baby foods tested lay in part at the lower limit of the stated values. Possibilities of improving the thiamine values are discussed.