Results 261 to 270 of about 305,051 (312)

Thermal degradation of injectable epinephrine

The American Journal of Emergency Medicine, 1994
The degradation of epinephrine in USP injectable cartridges was investigated under different heating conditions. Epinephrine (EPI) and EPI sulfonic acid (EPI-SA) levels in 1:10,000 (0.1 mg/mL) EPI injectable solutions subjected to either cyclical (65 degrees C for 8 hr/d for 4 to 12 weeks) or constant (65 degrees C for 7 days) heating were determined ...
W H, Church, S S, Hu, A J, Henry
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Thermal degradation of polystyrene

Vacuum, 1953
THE degradation of polymers may be elucidated by various approaches; one of the more accessible routes is a study of the volatile degradation products.
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The Thermal Degradation of Starch

1967
Publisher Summary This chapter discusses the thermal degradation of starch. Profound modifications and degradation of the molecular structure occur when starch granules, or their component amylose and aniylopectin, are heated. Pyrolysis is always accompanied by the evolution of volatile, decomposition products. The proportions and chemical complexity
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Thermal degradation of amorphous glibenclamide

European Journal of Pharmaceutics and Biopharmaceutics, 2012
A glibenclamide polymorph published by Panagopoulou-Kaplani and Malamataris (2000) [1], obtained by sublimation of amorphous glibenclamide, was analysed. A new interpretation of the data is presented and experimentally confirmed by X-ray powder diffractometry, Fourier transformation infrared spectroscopy, differential scanning calorimetry, and mass ...
Rehder, Sönke, Sakmann, Albrecht, Rades, Thomas, Leopold, Claudia S.   +3 more
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Thermal and thermal-oxidative degradation of polycyanates

Polymer Science U.S.S.R., 1974
Abstract The thermal and thermal-oxidative degradaation of polycyanates based on 4,4′-dicyanatodiphenyl (PC-4) and 9,9-bis-(4-cyanatophenyl)fluorene (PC-9) have been investigated over a wide range of temperatures. The kinetics of decomposition of the polycyanates have been studied and the apparent energies of activation for the over-all process of ...
V.V. Korshak, P.N. Gribkova, A.V. Dmitrenko, A.G. Puchin, V.A. Pankratov, S.V. Vinogradova   +5 more
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The thermal and thermal-oxidative degradation of chitin

Polymer Science U.S.S.R., 1980
The kinetics of volatile products liberation (CO, CO2, H2O) during the degradation of crab chitin have been investigated in helium and oxygen atmospheres, but also the rate of the oxygen absorption in the 230–280°C range. The activation energies of the respective processes have been determined. The chitin is less heat-resistant than cellulose.
A.P Mar'in, Yu.A Shlyapnikov
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The thermal degradation of polystyrene

1977
A review is made of the thermal degradation of polystyrene. In a theoretical study the importance of intramolecular transfer during degradation is emphasized in the formation of oligomeric volatiles. To account for past experimental results a mechanism is proposed involving biradical cage combination.
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The thermal and thermal-oxidative degradation of polynaphthylimidophenylquinoxalines

Polymer Science U.S.S.R., 1979
Abstract A study has been made of the relative importance of thermal (TD) and thermal-oxidative degradation (TOD) within a wide temperature range (300–600°C) on a number of polynaphthylimidophenylquinoxalines (PNTQ), containing diverse numbers of naphthylimide fragments to find out the optimal content of the latter.
V.V. Korshak, S.-S.A. Pavlova, P.N. Gribkova, I.V. Vlasova, Ye.S. Krongauz, N.M. Belomoina   +5 more
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Thermal and thermal oxidative degradation of polycarbamides

Polymer Science U.S.S.R., 1969
DATA is given in t h e literature by many authors studying thermal degradation mechanisms of polymers obtained by polymerization and polycondensation [~, 2], but little information is available regarding the thermal and thermal oxidative degradation of polycarbamides.
O.Ya. Fedotova, Tkhai Zoan Tin', H.S. Kolesnikov   +2 more
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Thermal Degradation of Sulforaphane in Aqueous Solution

Journal of Agricultural and Food Chemistry, 1999
Sulforaphane, a cancer chemopreventive agent identified from broccoli, was degraded in an aqueous solution at 50 and 100 degrees C. The reaction mixtures were extracted with methylene chloride and analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS).
Rosen, RT, Jin, Y, Wang, M, Ho, CT
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