Electro-oxidation of d-mannose on platinum, gold and nickel electrodes in aqueous medium

Recent progress in electrochemical oxidation of saccharides at gold and copper electrodes in alkaline solutions

“…Ideally it is preferred that the oxidation products and electron balance be carried out at the same time to facilitate mechanistic studies. However, most researchers have focussed on one component, with Parpot et al reporting an impressive list of products after chromatographic analyses (see Table 1) [39][40][41]. From their studies of galactose oxidation on Au, they concluded that the process was catalysed by the presence of hydrous gold oxides as already described by others.…”

“…systematically investigated the oxidation of D-mannose, D-galactose, Dsorbitol, D-gluconic acid, D-glucose-6-phosphate, D-glucuronic acid, 1,6-anhydro-β-D-glucose, methyl-β-D-glucopyranoside and 2-deoxy-D-glucose in 0.1 M NaOH solution [39][40][41]. Their approach was based upon measuring the possible oxidation products rather than evaluate the number of electrons.…”

“…Parpot et al [41] and Tominaga et al [43] also reported studies on structure-reactivity relationships for monosaccharide oxidation and surface poisoning during electrocatalytic monosaccharide oxidation, respectively. Both these studies have ramifications for example on bioprocess monitoring where a large number of such saccharides might be present at the same time.…”

“…These studies were conducted by slowly sweeping (5 mV s − 1 ) glucose derivatives (10 mM) in 0.1 M NaOH solution in order to observe the effect of functional groups on electro-reactivity [41]. It was observed that the oxidation of hemi-acetal at C1 atom proceeded with less demand on potential, whereas the oxidation of the primary alcohol group was preceded by an adsorption step.…”

“…These results were in agreement with previously reported coulometric and RDE studies. ⁎ Adapted from Parpot et al [39][40][41], where ND represents not quantifiable products. A concentration of 1.05 × 10 − 2 M for galactose and 1.0 × 10 − 2 M for mannose, all in a 0.1 M NaOH solution were used.…”