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- W2062415596 abstract "Abstract A novel procedure for the determination of L -ascorbic acid (vitamin C, AA) in natural orange juice samples is described. First, we examine the kinetics of reactions of m -methylbenzenediazonium ( m MBD) tetrafluoroborate in aqueous solutions. The method involves two electrochemical procedures: by directly monitoring diazonium salt loss (dediazoniation reaction) and by monitoring the derivatization product from coupling unreacted diazonium ions with 2-naphthol-6-sulphonic acid to give an azo dye (coupling reaction). The diazonium ions, dediazoniation products and derivatization products like azo dyes are electroactive compounds, showing well-defined peaks at −50 and −430 mV for diazonium ions, at +1.236 V for m -cresol (major dediazoniation product), both in 0.1 M HCl, and −659 mV for the azo dye in 0.01 M NaOH (all peak potentials vs. Ag/AgCl reference electrode). Secondly, a differential pulse polarographic method based on the accelerating effect of AA on the dediazoniation reaction of m MBD is described. This reaction is strongly accelerated in the presence of AA. The observed rate constant is linearly correlated with the total AA concentration and the calibration graph is linear over at least three orders of magnitude. m MBD kinetics are first-order (with respect to m MBD) in absence of and in presence of AA." @default.
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- W2062415596 date "1999-04-01" @default.
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- W2062415596 title "A novel method for the determination of vitamin C in natural orange juices by electrochemical monitoring of dediazoniation of 3-methylbenzenediazonium tetrafluoroborate" @default.
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- W2062415596 doi "https://doi.org/10.1016/s0003-2670(98)00727-2" @default.
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