Abstract
Partially oxidized starches were obtained by oxidation of water‐soluble potato starch with the NaOCl/2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) system in the absence of bromide in aqueous solutions at pH 10.2. Monosaccharide composition of the oxidized starches was studied by acid–base titration and NMR spectroscopy, and it was characterized by a content of B units with carboxyl groups (7–73 mol%), C units with C‐6‐aldehyde hydrate groups (5–37%), and non‐oxidized A units (20–88%). The feature of bromide‐free TEMPO‐mediated oxidation of starch was the formation of a significant amount of C units. In addition to monosaccharide composition, compositional heterogeneity of a starch sample with 73% of B units was described by the distribution of triad sequences BBB (54 mol%), ABA (20%), AAB + BAA (12%) and BAB (14%), which were quantified by NMR spectroscopy.
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