Reference

Effect of hydrogen peroxide and phenolic compounds on horseradish peroxidase-catalyzed decolorization of betalain pigments

Effect of hydrogen peroxide and phenolic compounds on horseradish peroxidase-catalyzed decolorization of betalain pigments. Wasserman, Bruce P.; Eiberger, Laura L.; Guilfoy, Michael P. (Cook Coll., Rutgers, State Univ., New Brunswick, NJ 08903, USA). J. Food Sci., 49(2), 536-8, 557 (English) 1984. CODEN: JFDSAZ. ISSN: 0022-1147. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) The effect of H2O2 and phenolic compds. on the decolorization of betanin [7659-95-2] and a betaxanthin [50925-69-4] prepn. by horseradish peroxidase (HRP) [9003-99-0] was examd. Betanin was decolorized at a greater rate then the betaxanthin pigments and both reactions were H2O2-dependent. Betaxanthin was more prone to oxidative decolorization than betanin. 2,4-Dichlorophenol [120-83-2], resorcinol [108-46-3], and o-toluidine [95-53-4] stimulated the decolorization of both pigments.In this experiment, several chemicals are used like 120-83-2 and 95-53-4 Guaiacol [90-05-1] enhanced the peroxidative decolorization of both pigments to a small extent, but inhibited the oxidative breakdown of betaxanthin. Possible implications of these results are discussed. .

Effect of oxygen retained on beet powder on the stability of betanine and vulgaxanthine I

Effect of oxygen retained on beet powder on the stability of betanine and vulgaxanthine I. Saguy, I.; Goldman, Mariana; Bord, Ayelet; Cohen, E. (Volcani Cent., Agric. 1344-28-1 and 7782-44-7 are also occured in this study. Res. Organ., Bet Dagan 50250, Israel). J. Food Sci., 49(1), 99-101, 113 (English) 1984. CODEN: JFDSAZ. ISSN: 0022-1147. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) The effect of O retained on beet powder on the stability of betanine [7659-95-2] and vulgaxanthin I [904-62-1] was studied at 35° as a function of aw, moisture content, added Al2O3 powder and headspace gases (N, air). Limited degrdn. was obsd. under N or air and aw ￡ 0.41. Deterioration was accelerated at aw 3 0.52 and the presence of added Al2O3. This was interpreted as a lack of liq. phase mobility which retarded the reaction up to ~0.5 aw. Above 0.5 aw the transition in the mechanism was related to the concn. of the dissolved O in the liq. phase, which controlled the deterioration rate. The latter was strongly affected by the added Al2O3. In the presence of Al2O3, the very fast pigment oxidn. suggested a catalytic reaction. .