Dampfdruckosmometrische Molekulargewichtsbestimmungen von hochschmelzenden,oxidierten Polyethylenwachsen

Molecular Weight Determination of High-melting, Oxidized Polyethylene Waxes by Vapour Pressure Osmometry Amongst the high-malting oxidized polyethylene waxes PE-Wax AC 392 of Allied Chemical Corp, holds an exceptional position as for its specification. Because of its crystallinity and the high melting point AC 392 can only be kept in solution at high temperatures. Several attempts to determine the molecular weight failed so far, because of these difficulties. The average number of the molecular weight (M?n) was determined for AC 392 and some similar waxes with a commercial vapour pressure osmometer at a working temperature of 125°C. The selection of the solvent is of importance; the high measuring temperature requires special experimental conditions.     

Bestimmung des Gehaltes an petroläther-unlöslichen oxidierten Fettsäuren zur Beurteilung von Brat- und Siedefetten

Determination of the Content of Petroleum Ether Insoluble Oxidized Fatty Acids for the Evaluation of Frying Fats Determination of the content of petroleum ether insoluble oxidized fatty acids is important for the evaluation of used frying fats. Presently, the DGF-Standard Method C-III 3 (68) for the determination of “oxidized fatty acids” is used for the examination of such fats. This method has been thoroughly revised by the working group “Analysis and Standard Methods” of the German Society for Fat Science and presented as Method C-III 3 (77) for “Petroleum ether insoluble oxidized fatty acids”, which is shortened by the step involving separation of unsaponifiable matter. Both methods C-III 3 (68) and C-III 3 (77) were evaluated in collaborative ring tests. Statistical evaluation of the results showed the same reproducibility for both methods, whereas the comparability according to the method C-III 3 (77) is much better than that according to the method C-III 3 (68). Therefore, the method C-III 3 (77) should be applied in future.     

Synthesen von Celluloseaustauschern mit chelatbildenden Gruppen II

The synthesis of chelate forming exchange materials containing o,o′-disubstituted diazo groups is described. The compounds are obtained by coupling diazo-cellulose with 2-naphthol, 2-naphthylamin or derivatives of 2-naphthylamin respectively.     

Synthese von Cellulose-Austauschern mit chelatbildenden funktionellen Gruppen

A new widely applicable method for the preparation of compounds for selective exchange on the basis of cellulose is described. For the synthesis the reaction principle for the preparation of ?Remazol”?^® (TM of Hoechst AG) dye stuffs is used in a modified form. Two variants are used. According to variant A functional groups are bound directly to cellulose. In variant B they are bound by diazo-coupling.     

Zur Bestimmung von Komplexanen in Waschmitteln

Determination of Chelating Substances in Washing Agents Methods for the thin-layer chromatographic identification and titrimetric determination of chelating substances in washing agents are described.     

Bestimmung der polaren Anteile in Fritierfetten

Determination of Polar Components in Frying Fats The DGF-Einheitsmethode C-III 3b (81) for the column chromatographic determination of polar components in frying fats is presented. This method was checked in a collaborative test with 14 participants. The evaluation of the results was done according to the statistical rules given in ”?Amtliche Sammlung von Untersuchungsverfahren nach § 35 LMBG' (Lebensmittel- und Bedarfsgegenständegesetz). At mean values of about 27% the value for the repeatability is 1.7% (absolute), and for the reproducibility is 2.8% (absolute).     

Gelchromatographische Bestimmung polymerisierter Triglyceride

Determination of Polymerized Triglycerides by Gel Chromatography For separation of monomer polymerized triglycerides in deep frying fats a simple glas apparatus is described. Polystyrene ”?Biobeads S-X 2″ is used as separation material and dichlormethane as eluent. In used deep frying fats a correlation exists between the non polar fat components, determined by column chromatography, and polymerized triglycerides.     

Zur fluorimetrischen Bestimmung von Xanthen-Farbstoffen in Lippenstiften

Fluorimetric Determination of Xanthene Colouring Materials in Lipsticks The qualitative detection of 12 xanthene colouring agents in lipsticks is described. The detection is carried out by preliminary screening using thin-layer chromatography and after elution of the colouring matter from thin-layer plate by means of absorption and fluorescence spectra. The possibility of quantitative fluorimetric determination of xanthene colouring materials is indicated with the examples of rhodamine-B and fluorescein. A procedure for working up lipsticks is given.     

Bestimmung des Mono- und Diglycerid-Gehaltes in Industrie-Bratfetten

Determination of Mono- and Diglyceride Contents of Frying Fats Long-term heating of fats at elevated temperatures result in a number of chemical reactions which may impair their quality. A large amount of data can be obtained if the characteristic analytical values are employed for characterizing and evaluating such fats. However, specific parameters are required for the characterization and evaluation. Since hydrolysis of glycerides may occur due to thermal treatment, the author has studied the alteration of mono- and diglyceride contents with prolonged thermal stress. After thin-layer chromatographic separation, the mono- and diglyceride contents are determined by the enzymatic method of glycerol analysis. The accuracy and validity of the method are discussed.     

Bestimmung von Dimethylsulfoxid-Spuren in Saccharose-Fettsäure-Estern

Determination of Traces of Dimethylsulfoxide in Fatty Acid Esters of Sucrose An IR-spectroscopic method for the determination of dimethylsulfoxide in the fatty acid esters of sucrose was worked out. The sensitivity of the method in quantitative determination is 0.2% and in qualitative determination 0.08%.