Abstract
A new liquid membrane electrode was developed which is highly selective and sensitive for vitamin B1. It is based on the thiamine-picrolonate ion-pair complex as an electroactive material in nitrobenzene solvent. The electrode has a remarkable selectivity for vitamin B1 in the presence of vitamins B2, B6, B12 and nicotinamide. The results obtained for the determination of vitamin B1 in various multivitamin preparations at levels as low as 1 μg/ml show an average recovery of 98% (mean standard deviation 1.8%) and are favourably compared with those obtained by the official methods.
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