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Thiamine hydrochloride, oxidation

The order in thiamine hydrochloride, oxidized by Ce(IV) in HCIO4 and catalysed by Mn +, is less than one. The rate decreased with H+ and Ce + ions, and Ce(OH) and Mn(H20)4 " are the reactive species. The formation of a substrate-catalyst complex is assumed in the proposed mechanism. ... [Pg.107]

A fluorometric method was developed for determination of atmospheric H2O2 simultaneously with other species present at ppbv or lower levels, avoiding chromatographic separation. H2O2 is selectively collected by diffusion through a Nafion membrane, and is carried by a water stream into a reactor where it oxidizes thiamine hydrochloride (117) to a fluorescent ionic form of thiochrome (118), catalyzed by bovine hematin (75b) in alkaline solution, as shown in equation 40. The end solution containing 118 is passed through... [Pg.641]

Thiamine hydrochloride is stable in acid but unstable in aqueous solutions with a pH above S. Under lhe.se conditions. it undergoes decomposition and inactivation. Exposure of thiamine to the atmosphere or to oxidizing reagents such as hydrogen peroxide, permanganate, or alkaline potassium ferricyanide oxidizes it readily to ihiochromc, shown below. Thiochromc exhibits a vivid blue fluorescence hence, this reaction is the basis for the quantitative fluoro-metric assay of thiamine in the USP. [Pg.886]

Figure 6.1. Thiamin and thiamin analogs, products of tliiaminolysis, and experimental antimetabolites. Relative molecular masses (M,) thiamin, 266.4 (chloride-hydrochloride, 337.3) thiamin monophosphate, 345.3 thiamin diphosphate, 425.3 thiamin triphosphate, 505.3 thiochrome, 262.3 thiamin thiol, 282.4 (oxidizes to thiamin disulfide, 562.7) oxythiamin, 301.8 and pyrithiamin, 420.2. Figure 6.1. Thiamin and thiamin analogs, products of tliiaminolysis, and experimental antimetabolites. Relative molecular masses (M,) thiamin, 266.4 (chloride-hydrochloride, 337.3) thiamin monophosphate, 345.3 thiamin diphosphate, 425.3 thiamin triphosphate, 505.3 thiochrome, 262.3 thiamin thiol, 282.4 (oxidizes to thiamin disulfide, 562.7) oxythiamin, 301.8 and pyrithiamin, 420.2.
Chem. Descrip. Soy protein cone., zinc oxide, niacinamide, ferrous suifate, copper giuconate, vitamin A paimitate, caicium pantothenate, thiamine mononitrate, pyri-doxine hydrochloride, riboflavin, and cyanocobalamin Chem. Analysis 6% max. moisture 20% total dietary fiber 290 calories/100 g CAS 68153-28-6 1314-13-2 98-92-0 7720-78-7 527-09-3 79-81-2 137-08-6 532-43-4 58-56-0 83-88-5 68-19-9 EINECS/ELINCS 232-720-8 215-222-5 202-713-4 231-753-5 208-408-2 201-228-5 205-278-9 208-537-4 200-386-2 201-507-1 200-680-0... [Pg.120]

See other pages where Thiamine hydrochloride, oxidation is mentioned: [Pg.678]    [Pg.678]    [Pg.60]    [Pg.175]    [Pg.90]    [Pg.1288]    [Pg.782]    [Pg.1288]    [Pg.90]    [Pg.1464]    [Pg.476]   
See also in sourсe #XX -- [ Pg.107 ]



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Thiamine hydrochloride

Thiamine, oxidation

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