Absorption Spectrum and Chemical Reactions of Colloidal Cadmium in Aqueous Solution

1992 ◽  
Vol 272 ◽  
Author(s):  
M. Gutiérrez ◽  
A. Henglein
Keyword(s):  
Aqueous Solution ◽  
Nitrous Oxide ◽  
Absorption Spectrum ◽  
Carbon Tetrachloride ◽  
Chemical Reactions ◽  
Redox Reactions ◽  
Methyl Viologen ◽  
Narrow Band ◽  
Optical Data

ABSTRACTA radiolysis method is described to prepare isolated cadmium particles in aqueous solution. The spectrum of these particles (narrow band at 260nm) agrees with the spectrum calculated from the optical data of cadmium. Clusters of particles absorb at longer wavelengths. Redox reactions of the particles with methyl viologen, nitrous oxide and carbon tetrachloride were also investigated. It is shown that the absorption spectrum of the particles changes during these reactions as de-clustering takes place.

Absorption spectrum and chemical reactions of colloidal cadmium in aqueous solution

1992 ◽  
Vol 96 (11) ◽  
pp. 4598-4602 ◽  
Author(s):  
A. Henglein ◽  
M. Gutierrez ◽  
E. Janata ◽  
B. G. Ershov
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectrum ◽  
Chemical Reactions

A novel route for aspartame production by combining enzymatic and chemical reactions for industrial use

2020 ◽  
Vol 85 (2) ◽  
pp. 464-466
Author(s):  
Kenzo Yokozeki ◽  
Isao Abe
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Chemical Reactions ◽  
Acid Ester ◽  
Amino Acid Ester ◽  
Acyl Transferase ◽  
Enzymatic Production ◽  
Production Route ◽  
Industrial Use ◽  
Hcl Removal

ABSTRACT Here, we report a novel industrial aspartame production route, involving the enzymatic production of α-l-aspartyl-l-phenylalanine β-methylester from l-aspartic acid dimethylester and l-phenylalanine by α-amino acid ester acyl transferase. The route also involves the chemical transformation of α-l-aspartyl-l-phenylalanine β-methylester to α-l-aspartyl-l-phenylalanine methylester hydrochloride (aspartame hydrochloride) in an aqueous solution with methanol and HCl, followed by HCl removal to form aspartame.

scholarly journals Calculations of Physical and Chemical Reactions with DNA in Aqueous Solution from Auger Cascades

1990 ◽  
Vol 31 (1-4) ◽  
pp. 59-62 ◽  
Author(s):  
H.A. Wright ◽  
R.N. Hamm ◽  
J.E. Turner ◽  
R.W. Howell ◽  
D.V. Rao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Chemical Reactions ◽  
Physical And Chemical

Rapid Thin Layer Chromatographic Determination of Aflatoxin M1 in Powdered Milk

1985 ◽  
Vol 68 (5) ◽  
pp. 952-954
Author(s):  
Maria Luisa Serralheiro ◽  
Maria Lurdes Quinta
Keyword(s):  
Aqueous Solution ◽  
Carbon Tetrachloride ◽  
Thin Layer ◽  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Methanol Solution ◽  
Aflatoxin M1 ◽  
Powdered Milk ◽  
Layer Chromatography

Abstract A method has been developed for the detection of aflatoxin Mi in milk. The toxin is extracted with chloroform, the extract is evaporated, and the residue is partitioned between carbon tetrachloride and an aqueous saline-methanol solution. The toxin is once again extracted with chloroform from the methanol solution and analyzed by thin layer chromatography. The limit of detection of Mi in powdered milk is 0.5 μg/ kg; recoveries of added Mj are about 83%. The limit of detection can be improved to 0.3 μg/kg if the plate is sprayed with an aqueous solution of H2S04 after development.

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