Stabilizer determination

The pattern of alkene stability determined from heats of hydrogenation parallels exactly the pattern deduced from heats of combustion... 

Various tests for rancidity, such as the Kreis test, may be used in stability determinations if the intensity of reaction is plotted against time. The curves so obtained will give an indication of the length of the induction period. However, the plotting of a curve for each sample is somewhat laborious. 

One example, a candidate matrix material of organotin species in marine water, had stability determined by storage for 120 days at 4°C in the dark, at ambient temperature, and exposed to daylight (Quevauviller and Donard 1991). Frequently storage at different temperatures over at least a i-year period are reported. Examples include organochlorine pesticides (OCPs) in BCR CRM 430, where pork fat was stored at -2o°C, -i-20°C, and -r37°C (van der Paauw et al. 1992). Storage at -20°C, -i-20°C, and -i-4o°C was performed for total and methyl Hg in BCR CRMs 463 and 464, tuna fish (Quevauviller et al. 1994), and metals in BCR CRM 600, EDTA and DTPA-extractable trace metal contents in calcareous soil (Quevauviller et al. 1998m). 

Altria, K. D., and Connolly, P. C. (1993). Online solution stability determination of pharmaceuticals by capillary electrophoresis. Chromatographia 37, 176—178. 

Unfortunately, this approach for electrochemical stability determination has not been widely adopted. The few exceptions include the seminal electrolyte work by Guyomard and Tarascon. In the formulation of new electrolytes for lithium ion technology, the spinel composite electrode was used as the standard working surface in all of the voltammetric measurements. The oxidative decomposition limits of the new electrolytes thus determined are summarized in Table 7 along with a handful of stability data that were determined in a similar approach for other electrolyte systems. 

Freitas, C. and Muller, R. H., Stability determination of solid lipid nanoparticles (SEN) in aqueous dispersion after addition of electrolyte. J. MicroencapsuL, 16, 59-71, 1999. Bunjes, H., Westesen, K. and Koch, M. H. J., Crystallization tendency and polymorphic transitions in triglyceride nanoparticles. Int. J. Pharm., 129, 159-73, 1996. Freitas, C. and Muller, R. H., Correlation between long-term stability of solid lipid nanoparticles (SLN) and crystallinity of the lipid phase. Eur. J. Pharm. Biopharm., 47, 125-32, 1999. 

Anon, "Military Explosives , PATR 9-1910/TO 11A-1-34(1955) Sensitivity to Impact (pp 43-7) Sensitivity to Friction (47-9) Sensitivity to Frictional Impact, which includes Rifle Bullet Impact Test (49) Sensitivity to Heat and Spark, which includes Explosion Temperature Test (49-52) Sensitivity to Initiation by Sand Test (52-3 Fig 10 on p 54) Stability Determinations, which include 75°C International Test, 100°C Heat Test, Vacuum Stability Test, and Potassium Iodide-Starch (KI)... 

Polymeric materials used for electrical insulation not only have to exhibit good electrical properties, but good mechanical properties and good appearance are also important. In addition to reliable electrical performance, thermal stability is important, mainly for miniaturized electronic and electrical equipment. Long-term stability at temperatures in the range between 90 to 125°C (194 to 257°F) is required and the short-term stability determines the resistance to melted solder and cut-through resistance. 

Alibrandi, G., Coppolino, S., D Aliberti, S., Ficarra, R., Micali, N., and Villari, A. (2003), Fast drug stability determination by LC variable-parameter kinetic experiments,/. Pharm. Biomed. Anal., 32,1073-1079. 

D. Garreau and J.-M. Saveant, Linear Sweep Voltammetry. Compensation of Cell Resistance and Stability. Determination of Residual Uncompensated Resistance, J. Electroanal. Chem. 35 309 (1972). 

D3.4 Emulsion Stability Determination Basic Protocol 1 Monitoring Droplet Size Distribution and Concentration D3.4.1... 

Ultrasonic methods infrared scanning for emulsion stability determination, 597-598 spectrometry, emulsion droplet size determination, 581 velocimetry, to measure fat, 572 Ultraviolet (UV). see also Spectrophotometry protein analysis, CD, 219-243 protein concentrations by... 

Integrated Strategies for Metabolic Stability Determination and Metabolic... 

INTEGRATED STRATEGIES FOR METABOLIC STABILITY DETERMINATION AND METABOLIC SOFT-SPOT CHARACTERIZATION... 

The acid-catalysed hydrolysis of 5-methoxyacenaphthylene 1,2-oxide was shown to proceed via the carbocation (76).149 This cation reacted with water to give an approximately 3 2 ratio of cis.trans diols, despite the trans-diol being substantially more stable. Hence, transition state effects, and not thermodynamic stability, determine the products. A computational investigation examined carbocations derived from oxidized benzo aJanthraccncs.150 Examples of cations considered are (77), derived by epoxi-dation and ring opening, and (78), derived by methyl oxidation and subsequent C—O bond heterolysis. 

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