High-performance liquid chromatographic investigations on the cleavage kinetics of side-chain-protected arginine derivatives with a sophisticated post-column reaction detector

1990 ◽  
Vol 512 ◽  
pp. 249-254
Author(s):  
Gerlad Grübler ◽  
Frank Gutjahr ◽  
Hartman F. Echner ◽  
Wolfgang Voelter ◽  
Herman Bauer
Keyword(s):  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Side Chain ◽  
Reaction Detector ◽  
Liquid Chromatographic ◽  
Kinetics Of

scholarly journals SYNTHESIS AND STUDY OF THE REACTION KINETICS OF HOMOVERATRILAMINE WITH BRASSYLIC ACID BY HPLC

2020 ◽  
Vol 9 (10) ◽  
pp. 1-7
Keyword(s):  
High Performance ◽  
Condensation Reaction ◽  
High Performance Liquid Chromatographic ◽  
Order Kinetic ◽  
First Order ◽  
Liquid Chromatographic Separation ◽  
Brassylic Acid ◽  
Liquid Chromatographic ◽  
Kinetics Of ◽  
Order Kinetic Equation

In this work, amide, isoquinoline were synthesized and the kinetics of the reaction of homoveratrylamine with brassilic acid was studied by HPLC. The conditions of (high-performance liquid) chromatographic separation were revealed, which allow satisfactory separation of the components of the reaction mixture consisting of reagents, intermediates and products of the reactions of condensation and cyclization. By studying the kinetic laws, it was found that the reactions of condensation and cyclization obey the first-order kinetic equation and the activation energy is, respectively, 172.3 kJ / mol for the amide condensation reaction, and 118.8 kJ / mol for the cyclization reaction.

Vulcanization Chemistry. Comparison of the New Accelerator N-t-Butyl-2-Benzothiazole Sulfenimide (TBSI) with N-t-Butyl-2-Benzothiazole Sulfenamide (TBBS)

1994 ◽  
Vol 67 (1) ◽  
pp. 76-87 ◽  
Author(s):  
Cynthia J. Hann ◽  
Alfred B. Sullivan ◽  
Brian C. Host ◽  
George H. Kuhls
Keyword(s):  
Chromatographic Analysis ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Sequential Reaction ◽  
Wide Range ◽  
Sulfur Vulcanization ◽  
Liquid Chromatographic Analysis ◽  
Liquid Chromatographic ◽  
Kinetics Of ◽  
Vulcanization Process

Abstract The sulfur vulcanization chemistry of cis-polyisoprene formulations accelerated with N-t-butyl-2-benzothiazole sulfenimide (TBSI) is compared to the chemistry of equivalent formulations accelerated with N-t-2-benzothiazole sulfenamide (TBBS). High performance liquid chromatographic analysis (HPLC) is utilized to examine the kinetics of accelerator-sulfur disappearance and the formation-appearance profiles of extra-network cure intermediates across the vulcanization process for stocks with a wide range of sulfur/accelerator ratios. Some unique features of TBSI vulcanization that distinguish it from TBBS are defined. A major distinction is the apparent consecutive step-wise kinetics of accelerator decay across the vulcanization process. A sequential reaction process may be indicated. Evidence is also offered that BtSxBt(x=2→6) is the crosslink precursor in TBSI vulcanization just as with TBBS formulations.

High Performance Liquid Chromatographic Identification of Anthocyanins

1980 ◽  
Vol 35 (7-8) ◽  
pp. 533-538 ◽  
Author(s):  
Dieter Strack ◽  
Naaman Akavia ◽  
Hans Reznik
Keyword(s):  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Rapid Identification ◽  
Partial Hydrolysis ◽  
Coumaric Acid ◽  
Optimal Resolution ◽  
Key Factor ◽  
Chromatographic Procedure ◽  
Liquid Chromatographic ◽  
Kinetics Of

A high performance liquid chromatographic procedure for a rapid identification of antho- cyanins is described. Besides their characteristic retention times, anthocyanins can easily be identified by an HPLC examination of the kinetics of appearance and disappearance of their partial hydrolysis products. This method is also applicable to 3-deoxyanthocyanins which is demonstrated with an extract from the fern Blechnum brasiliense. The described method allows optimal resolution of complex anthocyanin mixtures in the fol­lowing sequence of elution: 3-sophoroside-5-glucoside; 3-rutinoside-5-glucoside; 3,5-diglucoside; 3-sophoroside; 3-galactoside; 3-glucoside; 3-rutinoside; 5-glucoside; aglycone, and finally the forms acylated with p-coumaric acid. Substitution in the B-ring of the aglycone structure is the key factor for the range of the retention time. Thus cyanidin 3,5-diglucoside elutes earlier (-38 sec) than pelargonidin 3-sophoroside-5-glucoside.

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