Summary After an introduction on the production, classification, legislative regulations, toxicology, and analysis of caramel colours, a report is given on the examination of these colourings by Curie-point pyrolysis-capillary gas chromatography-mass spectrometry. This method enables the differentiation between the four classes of caramel colours on the basis of the most concentrated of more than 100 identified pyrolysis products, which requires small quantities of substance (100 g) and short periods of time (1 h).
Zur Analytik von Zuckercouleuren I. Mitteilung: Differenzierung der Couleurklassen mittels Curiepunkt-Pyrolyse-Capillargaschromatographie-Massenspektrometrie
Zusammenfassung Nach einer Einführung zur Herstellung, Klassifizierung, rechtlichen Stellung, Toxikologie und Analytik der Zuckercouleure wird über die Untersuchung dieser Farbstoffe mittels Curiepunkt-Pyrolyse-Capillargaschromatographie-Massenspektrometrie berichtet. Anhand der konzentrationsstärksten der über 100 identifizierten Pyrolyseprodukte ist es möglich, die vier Couleurklassen bei geringem Substanz- (100 g) and Zeitbedarf (1 h) sicher zu differenzieren.
Science China Technological Sciences - The China Seismo-Electromagnetic Satellite (CSES), China’s first satellite to measure geophysical fields with scientific goals in both space and solid... 相似文献
Recently developed oligomeric β-hydroxyalkyl urethane polyols are finding application as modifiers and crosslinkers for waterborne and high solids coatings. In waterborne coatings, urethane polyols can be used as modifiers for acrylic, polyester or alkyd melamine resin crosslinked coatings to replace the cosolvent. In high solids coatings, polyurethane polyols are being employed to raise the application solids, increase film hardness and water resistance, and exterior durability.
There are also applications for polyurethane diols as resin intermediates and in the preparation of blocked isocyanate crosslinkers. β-Hydroxyalkyl urethane diol or polyols can be prepared by an isocyanate reaction with a diol, such as 1,2-propylene glycol, but also by non-isocyanate processes. The non-isocyanate routes to urethanes can utilize carbon monoxide, carbon dioxide, urea or organic carbonates as a carbonyl source for the carbamic acid ester.
It is possible to split these urethanes to the isocyanate, but interest has concentrated on using the urethane intermediates directly in coating applications without going through the isocyanate. The structures reported are bis-hydroxyalkyl urethane intermediates and derivatives of these compounds. 相似文献
The aerodynamic diameter of a non-spherical aerosol particle is primarily related to the final settling velocity of the particle. The aerodynamic diameter is not obtained directly from mobility measurements by formally calculating a sphere diameter from the mobility equation for a spherical particle. Instead, a correction factor involving the dynamic shape factor of the non-spherical particle must be applied. 相似文献
The antioxidative activity of α-tocopherol in oil is necessary for the inhibition of lipid peroxidation. If no regeneration of antioxidants is possible in foods, oxidation products are formed to a measurable extent. The aim of this study was to investigate oxidation products of α-tocopherol in plant oil. The oxidation of α-tocopherol in plant oil leads to α-tocopherolquinone and to two epoxides (α-tocopherolquinone-2,3-epoxide, α-tocopherolquinone-5,6-epoxide). These three reaction products were identified and quantified in plant oil. The 2,3-epoxide is formed at lower temperatures (90°C) whereas at high temperatures (180–220°C) only the 5,6-epoxide appears. The kinetics show that the 5,6-epoxide is produced as long as α-tocopherol is present. With longer reaction times the concentration of the 5,6-epoxide starts to decrease. α-Tocopherolquinone is found at substantially lower concentrations. 相似文献
Analytical Characterisation of Palm Oil Fractions by HPLC of Triglycerides The increasing importance of palm oils and palm oil fractions in international trade makes it necessary to develop analytical criteria for the characterisation of these products. One problem is the correct identification of palm oleins, which are often difficult to distinguish from palm oils. These products frequently exhibit similar fatty acid by GLC and similar iodine values. The correct identification of palm stearins by GLC is comparatively more easy. Palm oleins and palm oils can be characterized by HPLC using conditions that permit not only the separation of triolein from less unsaturated triglycerides of the same carbon number, but also, at the same time, a separation of tripalmitin from triglycerides containing oleic acid. By establishing the peak area ratios for a number of selected triglycerides a clear differentiation between palm oils and palm oleins, as well as various other palm oil fractions and their mixtures is obtained. 相似文献
Influence of Product Properties on Drying. A number of items of information are required for selection and design of a drying process. Thermodynamic equilibrium as well as heat and mass transfer are the traditional prerequisites for describing the drying operation. In the development of a drying process further specific properties of the product must be known. These properties, such as chemical reactions or sticking properties, greatly reduce the number of possible drying processes. For this reason, the measurement of these properties plays an important role in the development of a drying process. Many of the bench scale tests in use do not have a physical basis, but have been developed empirically because the physical context is often unknown. Yet a number of physically well-defined methods are available for product characterization. In practical work a combination of empirical and scientifically defined methods is used. 相似文献
The pyrolysis of sewage sludge was examined by thermogravimetric analysis using different heating rates, particle sizes and final temperatures. A semi-empirical model was developed with four global consecutive/competitive reactions to volatile and solid products including also a heat balance. This model was extrapolated to isothermal reactor conditions and compared to experimental data on fluidized bed pyrolysis. Depending on the particle size and reactor temperature, about 90% of the maximum conversion in a fluidized bed takes place under external heat transfer control, the rest under kinetic control. Incomplete conversion occurs at short particle residence times, which were calculated approximately by the model. 相似文献