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A flow-injection spectrophotometric procedure for determination of N-(2-mercapto-propionyl)-glycine (MPG) tropronin has been proposed. Determination was based on the '.; coupled redox-complexation reaction between MPG, Fe(III) and 2,4,6-trypyridyl-S-triaz-ine (TPTZ). Firstly, MPG reduced Fe(III) to Fe(II), which was rapidly converted to the highly stable, deep-blue coloured Fe(TPTZ)2+. This coloured...