The NIST program for environmental Standard Reference Materials (SRM) includes materials covering a range of matrices, mass
fraction values and analytes. For many SRMs, mass fraction data are accumulated, incidentally, over time, as these are used
routinely for quality assurance purposes. Although these are not formal stability studies, data generated may be useful in
assessing stability. To evaluate the potential for assessing material stability from incidental use of SRMs, results of neutron
activation analysis performed from 1992 through 2008 were compiled for SRM 1547 Peach Leaves and SRM 1566a Oyster Tissue.
Results indicate that incidental use of SRMs yields useful information on SRM stability.
Authors:Zuzana Cibulková, Peter Šimon, Peter Lehocký, Károly Kosár, and Ján Uhlár
Effect of several p- and p,p′-substituted diphenyl amines on the thermooxidative stability of styrene-butadiene rubber (SBR) has been studied using non-isothermal
DSC measurements with the aim of exploring the relation between the structure of the compound and its antioxidative performance.
The treatment of the experimental data was carried out by applying a new method based on a non-Arrhenian temperature function.
In order to compare the stabilizing effect of the compounds, protection factors have been calculated from the oxidation induction
times. The results achieved document that some functional groups in substituted diphenyl amines modify greatly the antioxidative
performance. The groups having a positive mesomeric effect increase dramatically the antioxidant efficiency; the highest increase
exhibited the nitroso group. On the other hand, the nitro group with the negative mesomeric effect is responsible for the
loss of antioxidative properties. In general, the protection factors of the compounds depend on temperature.
Authors:M. Łaszcz, K. Trzcińska, K. Filip, A. Szyprowska, M. Mucha, and P. Krzeczyński
capecitabine follows a pathway with three enzymatic steps. The final step of conversion to 5-fluorouracil is catalyzed by thymidine phosphorylase, which is four times more active in tumor cells than in a healthy tissue [ 1 ].
Stability testing of an
Authors:I. S. Aji, E. S. Zainudin, A. Khalina, S. M. Sapuan, and M. D. Khairul
, thermal stability, and energy damping ( T g T m ), there is the need to understand the matrix to be use, reinforcing elements and their interfaces [ 10 ].
High temperature processing of both natural and synthetic polymers no doubt influence the
Authors:Nihar Ranjan Pani, Lila Kanta Nath, Sujata Acharya, and Biswanath Bhuniya
Chemical structure of nateglinide
The excipients are generally used in dosage form to ease in administration of drug, to facilitate the formulation of the drug product, to increase the stability of the formulation, for
Andrés, J. — Hernando, I. — López-Salido, J. D. (1999): Assessing the Benefits of Price Stability: the International Experience.
Banco de Espana — Servicio de Estudios, Estudios Económicos
, No. 69.
Artis, M. J