PubMed · 265464
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A Schulman, T K Vaidyanathan. 1977. Dental cements for luting and lining.. https://pubmed.ncbi.nlm.nih.gov/265464/
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A highly sensitive, simple determination of serum iron and binding capacity is described. FeIII/FeII reacts with chromazurol B (CAB) and cetyltrimethyl ammonium bromide (CTMA), the resulting substance being a highly coloured ternary complex. Maximal absorbance of the complex occurs at pH 4.6--5.5 at 630 nm. Lambert Beer's law holds between 0 and 80 mumol Fe/l. Molar absorptivity is 1.68 X 10(5) 1 . mol-1 . cm-1 at 630 nm. Interference by other serum components is negligible even at high concentrations.
The quantitative analysis of benzoic and sorbic acid, methyl, ethyl and propyl esters of p-hydroxybenzoic acid and saccharin in foodstuffs is described. These compounds are quantitatively extracted with disposable clean-up columns packed with Extrelut and simultaneously determined by high-performance liquid chromatography on reversed-phase columns. Complicated matrices such as cheese, cake, ketchup and chocolate were tested and recoveries were generally better than 95% in the concentration ranges normally used in the food industry.
The 70 eV electron impact mass spectra of the acyclic perbenzoyl 0-benzyloximes of several mono- and disaccharides of clinical interest and the perbenzoates of certain related alditols have been obtained and compared with those of other similar derivatives studied previously. In general, the spectra of the benzyloximes contain molecular ions and characteristic fragments due to [C6H5]+,[C7H7]+,[C6H5CO]+ and [C6H5CooH]+., losses of HCHO, C6H5COO. and C6H5COOH, and cleavages along the carbon chain. The most unique ions in these spectra arise from the combined loss of C7H7. and C6H5COO.from the molecular ion: m/z 191 (C3), m/z 339 (deoxy-C5), m/z 459 (C5), m/z 473 (deoxy-C6), and m/z 593 (C6). The alditol benzoates fragment similarly, but they do not yield molecular ions. These data are being used to help confirm the identities of carbohydrates in biologic fluids fractionation by high performance liquid chromatography, prior to the establishment of routine quantitative assays for several of these compounds.