Kinetics of chemical degradation of isoxaflutole: influence of the nature of aqueous buffers (alkanoic acid/sodium saltvs phosphate)

2001 ◽  
Vol 57 (4) ◽  
pp. 366-371 ◽  
Author(s):  
Estelle Beltran ◽  
H�l�ne Fenet ◽  
Jean-Fran�ois Cooper ◽  
Camille-Michel Coste
Keyword(s):  
Chemical Degradation ◽  
Alkanoic Acid ◽  
Kinetics Of

Kinetics of formation and dissociation of triaza-crown-alkanoic acid complexes of cerium(III) and europium(III)

Polyhedron ◽  
1995 ◽  
Vol 14 (10) ◽  
pp. 1299-1306 ◽  
Author(s):  
Ki-Young Choi ◽  
Dong Won Kim ◽  
Choon Pyo Hong
Keyword(s):  
Alkanoic Acid ◽  
Kinetics Of Formation ◽  
Kinetics Of

Kinetics of the chemical degradation of diuron

Chemosphere ◽  
2002 ◽  
Vol 48 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Stefano Salvestrini ◽  
Paola Di Cerbo ◽  
Sante Capasso
Keyword(s):  
Chemical Degradation ◽  
Kinetics Of

Formation kinetics of triaza-crown-alkanoic acid complexes of first-row transition metal(II) ions

1996 ◽  
Vol 7 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Ki-Young Choi ◽  
Se Hun Kang ◽  
Dong Won Kim ◽  
Yong Soon Chung ◽  
Chang Suk Kim ◽  
...  
Keyword(s):  
Transition Metal ◽  
Alkanoic Acid ◽  
Formation Kinetics ◽  
Kinetics Of

scholarly journals How enzymes are adsorbed on soil solid phase and factors limiting its activity: A Review

2017 ◽  
Vol 31 (2) ◽  
pp. 287-302 ◽  
Author(s):  
Rahul Datta ◽  
Swati Anand ◽  
Amitava Moulick ◽  
Divyashri Baraniya ◽  
Shamina Imran Pathan ◽  
...  
Keyword(s):  
Enzymatic Activity ◽  
Solid Phase ◽  
Solid Surfaces ◽  
Chemical Degradation ◽  
Enzyme Adsorption ◽  
Factors Affecting ◽  
Soil Enzymatic Activity ◽  
Different Types ◽  
Kinetics Of ◽  
Soil Solid Phase

Abstract A majority of biochemical reactions are often catalysed by different types of enzymes. Adsorption of the enzyme is an imperative phenomenon, which protects it from physical or chemical degradation resulting in enzyme reserve in soil. This article summarizes some of the key results from previous studies and provides information about how enzymes are adsorbed on the surface of the soil solid phase and how different factors affect enzymatic activity in soil. Many studies have been done separately on the soil enzymatic activity and adsorption of enzymes on solid surfaces. However, only a few studies discuss enzyme adsorption on soil perspective; hence, we attempted to facilitate the process of enzyme adsorption specifically on soil surfaces. This review is remarkably unmatched, as we have thoroughly reviewed the relevant publications related to protein adsorption and enzymatic activity. Also, the article focuses on two important aspects, adsorption of enzymes and factors limiting the activity of adsorbed enzyme, together in one paper. The first part of this review comprehensively lays emphasis on different interactions between enzymes and the soil solid phase and the kinetics of enzyme adsorption. In the second part, we encircle various factors affecting the enzymatic activity of the adsorbed enzyme in soil.

Kinetics of interaction of copper ion with four diaza-crown-alkanoic acid complexes

1988 ◽  
Vol 27 (10) ◽  
pp. 1834-1836 ◽  
Author(s):  
Stanislaw P. Kasprzyk ◽  
Ralph G. Wilkins
Keyword(s):  
Copper Ion ◽  
Alkanoic Acid ◽  
Kinetics Of

scholarly journals Chemical degradation kinetics of fibrates: bezafibrate, ciprofibrate and fenofibrate

2016 ◽  
Vol 52 (3) ◽  
pp. 545-553 ◽  
Author(s):  
Marcelo Antonio de Oliveira ◽  
Gerliane Damázio da Silva ◽  
Michele Soares Tacchi Campos
Keyword(s):  
Degradation Kinetics ◽  
Chemical Degradation ◽  
Kinetics Of

scholarly journals Solid State Stability and Kinetics of Degradation for Candesartan—Pure Compound and Pharmaceutical Formulation

Pharmaceutics ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 86
Author(s):  
Valentina Buda ◽  
Bianca Baul ◽  
Minodora Andor ◽  
Dana Emilia Man ◽  
Adriana Ledeţi ◽  
...  
Keyword(s):  
Candesartan Cilexetil ◽  
Active Pharmaceutical Ingredient ◽  
Pharmaceutical Formulation ◽  
Attenuated Total Reflection ◽  
Chemical Degradation ◽  
Npk Method ◽  
Ambient Conditions ◽  
Kinetics Of Degradation ◽  
The Impact ◽  
Kinetics Of

The aim of this work was to assess the impact of an excipient in a pharmaceutical formulation containing candesartan cilexetil over the decomposition of the active pharmaceutical ingredient and to comparatively investigate the kinetics of degradation during thermolysis in an oxidative atmosphere under controlled thermal stress. To achieve this, the samples were chosen as follows: pure candesartan cilexetil and a commercial tablet of 32 mg strength. As a first investigational tool, Universal attenuated total reflection Fourier transform infrared (UATR-FTIR) spectroscopy was chosen in order to confirm the purity and identity of the samples, as well as to check if any interactions took place in the tablet between candesartan cilexetil and excipients under ambient conditions. Later on, samples were investigated by thermal analysis, and the elucidation of the decomposition mechanism was achieved solely after performing an in-depth kinetic study, namely the use of the modified non-parametric kinetics (NPK) method, since other kinetic methods (American Society for Testing and Materials—ASTM E698, Friedman and Flynn–Wall–Ozawa) led to inadvertencies. The NPK method suggested that candesartan cilexetil and the tablet were degraded by the contribution of two steps, the main being represented by chemical degradation and the secondary being a physical transformation. The excipients chosen in the formulation seemed to have a stabilizing effect on the decomposition of the candesartan cilexetil that was incorporated into the tablet, relative to pure active pharmaceutical ingredient (API), since the apparent activation energy for the decomposition of the tablet was 192.5 kJ/mol, in comparison to 154.5 kJ/mol for the pure API.

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