Abstract
LONDON Society of Public Analysts, Oct. 5.—E. Hinks: Third report of the Milk Products Sub-Committee: Tho analysis of sweetened condensed milk in which the sucrose has altered during storage. Tho problem was at first thought to be one merely of determining invert sugar, but by the study of ‘aged’ sweetened condensed milk by various processes, a modified Barfoed process, copper reduction processes, and in particular a combination of the polarimetric and chloramine-T-iodide oxidation, it was found that the usual hydrolysis products of sucrose present, if any, were dextrose, laevulose and Isevan, tho proportion of dextrose being sometimes as high as nine or ten times that of laevulose.—E. B. Hughes: A new; copper reagent for sugar determinations. This reagent consists of copper acetate (5 gm.) mixed with triethanolamine (5 gm.) and made up with water to 100 c.c. The reagent has selective reducing properties; its action on dextrose is appreciable; its action on Isevulose is very much greater, and it is only negligibly active towards sucrose, lactose and maltose. By modifying the formula (also by purifying I the triethanolamine) the reagent can bo made to react strongly with Isevulose, but not to oxidise dextrose.—W. G. Moffitt: A colorimetric method for the determination of chloroform. The blue colour reactions given by chloroform with α- or β-naphthol in a strong solution of sodium hydroxide have been made the basis of a rapid colorimetric method of determining chloroform. None of the seven chloro compounds tried (including carbon tetrachloride) was found to have any appreciable influence on the reaction with β-naphthol, although α-naphthol gives a blue coloration with carbon totrachloride under the conditions of the test.
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Societies and Academies. Nature 130, 638–640 (1932). https://doi.org/10.1038/130638a0
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DOI: https://doi.org/10.1038/130638a0