[Spectral-photometric determination of L-ascorbic acid with N-bromsuccinimide and starch iodide (author's transl)].
A new spectrophotometric method for the determination of L-ascorbic acid (AS) with N-bromosuccinimide (NBS) and starch iodide as an indicator was developed. The questions of pH-dependence, sensitivity and specificity of the oxidation-reduction process were investigated. The method is suitable for the determination of AS in acid solutions; the best pH was 2.6. The specificity of the method for AS cannot be considered as definitely better than other methods. Its sensitivity, however, is higher than when using 2.6-dichlorophenol-indophenol (DIP). When applied the method usually yielded results close to the DIP method and due to its high sensitivity AS determinations in very dilute and hazy solutions are possible.
D001205:Ascorbic Acid / Q000032:analysis*; D001974:Bromosuccinimide; D007202:Indicators and Reagents; D007454:Iodides; D013053:Spectrophotometry / Q000379:methods; D013213:Starch
D007202:Indicators and Reagents; D007454:Iodides; D013213:Starch; D001974:Bromosuccinimide; D001205:Ascorbic Acid
Spektralphotometrische Bestimmung von L-Ascorbinsäure mit N-Bromsuccinimid und Jod-Stärke.