Kinetic study of permanganate oxidation of L-leucine in neutral aqueous solution

1988 ◽  
Vol 53 (3) ◽  
pp. 479-486 ◽  
Author(s):  
Enrique Brillas ◽  
José A. Garrido ◽  
Joaquin F. Perez-Benito ◽  
Rosa M. Rodriguez ◽  
Jaime de Andres
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Kinetic Study ◽  
Kinetic Data ◽  
Reaction Pathways ◽  
Soluble Form ◽  
Permanganate Oxidation ◽  
Zwitterionic Form ◽  
Neutral Aqueous Solution ◽  
Ph Range

The permanganate oxidation of L-leucine in aqueous phosphate buffers over the pH range 6.1 – 7.6 is autocatalyzed by the manganese reduction product, a soluble form of colloidal manganese dioxide. The kinetic data for both the non-catalytic and autocatalytic reaction pathways have been obtained, and mechanism in agreement with them proposed. The non-catalytic pathway takes place by reaction between either the anionic or the zwitterionic form of the amino acid and permanganate ion, whereas the autocatalytic pathway is realized by the permanganate oxidation of the amino acid previously adsorbed on the colloid surface.

Kinetic study of CO2 with various amino acid salts in aqueous solution

2009 ◽  
Vol 64 (1) ◽  
pp. 59-68 ◽  
Author(s):  
J. van Holst ◽  
G.F. Versteeg ◽  
D.W.F. Brilman ◽  
J.A. Hogendoorn
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Kinetic Study ◽  
Amino Acid Salts ◽  
Acid Salts

Kinetic study of the polymerization of α-amino acid N-carboxyanhydrides in aqueous solution using capillary electrophoresis

2002 ◽  
Vol 952 (1-2) ◽  
pp. 239-248 ◽  
Author(s):  
R. Plasson ◽  
J.Ph. Biron ◽  
H. Cottet ◽  
A. Commeyras ◽  
J. Taillades
Keyword(s):  
Aqueous Solution ◽  
Capillary Electrophoresis ◽  
Amino Acid ◽  
Kinetic Study

ChemInform Abstract: Europium(III)-N,N′-ethylenebis(L-amino acid) Complexes as New Chiral NMR Lanthanoid Shift Reagents for Unprotected α-Amino Acids in Neutral Aqueous Solution.

ChemInform ◽  
2010 ◽  
Vol 32 (28) ◽  
pp. no-no
Author(s):  
Makoto Takemura ◽  
Kazuhiro Yamato ◽  
Matsumi Doe ◽  
Masaaki Watanabe ◽  
Hiroyuki Miyake ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Complexes ◽  
Neutral Aqueous Solution ◽  
Shift Reagents

The Stability and Structure of Complex Species Formed in Equilibrium Reactions of Diethyltin(IV) with N-D-Gluconylamino Acids in Aqueous Solution

1995 ◽  
Vol 50 (4) ◽  
pp. 515-523 ◽  
Author(s):  
B. Gyurcsik ◽  
N. Buzás ◽  
T. Gajda ◽  
L. Nagy ◽  
E. Kuzmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Water Soluble ◽  
Complex Formation Equilibria ◽  
Complex Species ◽  
Carboxylate Oxygen ◽  
Equilibrium Reactions ◽  
Formation Equilibria ◽  
The Stability ◽  
Ph Range

Complex formation equilibria of diethyltin(IV) with five N-D-gluconylamino acids in aqueous solution (I = 0.1 M, NaClO4) were studied and the stabilities of the species were determined by potentiometric titrations. Diethyltin(IV) complexes of α-amino acid derivatives are water-soluble in the physiological pH range, while in the presence of N-D-gluconyl-β-alanine a precipitate is formed, which dissolves with increasing pH. 13C NMR measurements showed that in the N-D-gluconyl-α-amino acid complexes the ligand is coordinated through its deprotonated carboxylate oxygen, amide nitrogen and C(2)-hydroxy group, while for the soluble N-D-gluconyl-β-alanine complex the ligand is coordinated via the deprotonated carboxylate and C(3)-, C(4)-, C(5)-hydroxy groups. Mössbauer measurements reflected the geometry of the complexes formed.

Metallkomplexe mit biologisch wichtigen Liganden, CXIX [1]. Ein tetraedrischer Zink-Komplex (L-terf-Leucin)2ZnCl2 mit Carboxylat-koordiniertem L-terf-Leucin in der / Zwitterform Metal Complexes of Biologically Important Ligands, CXIX [1]. A Tetrahedral Zinc Complex (L-terf-Leucine)2ZnCl2 of Carboxylate Coordinated L-terr-Leucine in the Zwitterionic Form

1999 ◽  
Vol 54 (6) ◽  
pp. 734-736 ◽  
Author(s):  
Winfried Hoffmüller ◽  
Kurt Polborn ◽  
Wolfgang Beck
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Metal Complexes ◽  
Structure Analysis ◽  
Zinc Complex ◽  
Carboxylate Group ◽  
Tetrahedral Structure ◽  
X Ray ◽  
Zwitterionic Form

From an aqueous solution of ZnCl2 and L-terMeucine the complex (L-terr-Leucine)2ZnCl2 · 2 CH3OH with a distorted tetrahedral structure is formed in which, according to an X-ray structure analysis, the zwitterionic form o f the amino acid is coordinated through the carboxylate group

scholarly journals A New Approach on the Amino Acid Lysine Quantification by UV-Visible Spectrophotometry

2020 ◽  
Vol 71 (8) ◽  
pp. 159-175
Author(s):  
Habib Bouzid ◽  
Cesar M. C. Filho ◽  
Joana Rita C. Marques ◽  
Artur J. M. Valente ◽  
Licinio M. Gando-Ferreira
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Volume Ratio ◽  
Absorbance Spectrum ◽  
Reaction Conditions ◽  
New Approach ◽  
Analytical Technique ◽  
Initial Ph ◽  
Uv Visible ◽  
Ph Range

The methodology of the amino acid lysine (Lys) analysis using ninhydrin (Nin) reagent by spectrophotometric method was in-depth studied and improved. The optimization of time, Lys to Nin volume ratio and temperature were explicitly investigated. A specific wavelength of 479 nm was set according to the peak of the absorbance spectrum. The reaction time between Lys and Nin, in aqueous solution, occurs during 50 min. The Lys/Nin ratio 1.67 appeared most effective for this reaction. Moreover, the absorbance increased with temperature until a stable value was achieved nearly at 85�C. It was also found that the reaction is more efficient at initial pH 6 corresponding to formation of high amount of coloured product. Furthermore, the pH of post-reaction mixture was around 4 for different concentrations of lysine and initial pH range 3�10. For lysine solution contaminated with potassium (a representative interfering species) and after variation of the reaction conditions, the maximum wavelength (479 nm) was not affected. Mastering the use of these parameters leads to a good usage of this analytical technique which is simple, fast, accurate, less expensive and especially less harmful towards the environment and human health.

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