Electrostatic interaction of oil droplets with adsorbed surface-active ions in dilute electrolyte solutions
✍ Scribed by N. F. H. Ho; A. Suzuki; W. I. Higuchi
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 505 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0022-3549
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✦ Synopsis
on thin-layer plates as described in the Experimental section. The DIH reagent was used because of its high reactivity toward carbonyl compounds (15, 16). Thermal degradation products of this ascorbic acid-silicic acid system are shown in Fig. 4. Examination of the chromatogram does indicate the absence of furfural, the possible presence of levulinic acid, and, in addition, other unidentified degradation products, and strongly suggests that ascorbic acid in this adsorbed state undergoes a different type of degradation from that in aqueous solution. Although furfural was not detected in this system, it is still possible that any furfural formed could have volatilized from the solid surface or undergone polymerization. It is highly unlikely, however, that levulinic acid results from furfural degradation, since Lamden and Harris (11) pointed out that the formation of furfural in solution degradation does not result from dehydroascorbic acid which, as mentioned before, is probably the first step in the oxidation of ascorbic acid in the adsorbed state. It is, therefore, highly likely that the degradation pathway in the adsorbed state may be quite different from that in solution.