Determination of methyltestosterone and intermediate products of its production in the air of industrial rooms

1975 ◽  
Vol 9 (10) ◽  
pp. 677-678
Author(s):  
V. K. Ermakova ◽  
I. I. Dozorova
Keyword(s):  
Intermediate Products

The Use of Piezosensors for Determination of Carboxylic Acids in the Intermediate Products of Edible Ethanol Production

2020 ◽  
Vol 56 (14) ◽  
pp. 1379-1383
Author(s):  
Cao Nhat Linh ◽  
O. V. Duvanova ◽  
S. Yu. Nikitina ◽  
A. N. Zyablov
Keyword(s):  
Ethanol Production ◽  
Carboxylic Acids ◽  
Intermediate Products

Photocatalytic degradation of pesticide methomyl: determination of the reaction pathway and identification of intermediate products

2006 ◽  
Vol 5 (5) ◽  
pp. 477 ◽  
Author(s):  
M. Tamimi ◽  
S. Qourzal ◽  
A. Assabbane ◽  
J.-M. Chovelon ◽  
C. Ferronato ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Pathway ◽  
Intermediate Products

scholarly journals Application of high-performance liquid chromatography in porphyrias diagnostics

2021 ◽  
Vol 20 (3) ◽  
pp. 140-144
Author(s):  
А. I. Puzikova ◽  
Е. А. Litvin ◽  
D. А. Kildyushkin ◽  
А. Е. Druy
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Clinical Manifestations ◽  
Chromatography Method ◽  
Intermediate Products ◽  
Heme Synthesis ◽  
Timely Diagnosis ◽  
Liquid Chromatography Method

Porphyrias are distinguished by the stage of heme synthesis at which a failure occurs, leading to the accumulation of intermediate products – porphyrins. Due to the low specificity of clinical manifestations of porphyria and the latent course of the disease, their timely diagnosis is difficult. This article substantiates the effectiveness of high-performance liquid chromatography method in the determination of porphyrins. The method is suitable for porphyrin determination in urine, blood and feces of patients. Examples of its work are shown.

THE USE OF PIEZOSENSORS FOR DETERMINATION OF CARBOXYLIC ACIDS IN THE INTERMEDIATE PRODUCTS OF EDIBLE ETHANOL PRODUCTION

2019 ◽  
Vol 85 (4) ◽  
pp. 11-16
Author(s):  
Cao Nhat Linn ◽  
Olga V. Duvanova ◽  
Svetlana Yu. Nikitina ◽  
Alexander N. Zyablov
Keyword(s):  
Ethanol Production ◽  
Carboxylic Acids ◽  
Rapid Determination ◽  
Piezoelectric Sensors ◽  
Molecularly Imprinted ◽  
Alcohol Production ◽  
Intermediate Products ◽  
Relative Standard ◽  
Acid Determination

The reference polymers and polymers with molecular imprints of carboxylic acids (MIPs-CA) — propionic (MlP-Propionic) and butyric (MIP-Butyric) acids — were synthesized on the surface of piezoelectric sensors using aromatic compounds by the non-covalent imprinting method. Molecularly imprinted polymer (MIP) is a polymer produced through molecular imprinting, which leaves cavities in the polymer matrix with affinity to a chosen "template" target molecule. The values of the imprinting factor and selectivity coefficients were calculated to assess the ability of MIPs-CA to recognize the target molecules. It is shown that the sensors modified by the molecularly imprinted polymers exhibit high selectivity for the acid that was a template during their synthesis. The detection limits for propionic and buty ric acids are 7.40 x 10~6 and 8.81 x 10-6 g/dm3, respectively. Correctness of the carboxylic acid determination in model solutions was verified in the spike/recovery tests. The relative standard deviation is less than 10%. The modified piezoelectric sensors were tested in analysis of the intermediate products of edible ethanol production (distillate of fermentation mixture, epyurat, bottom liquids of columns). The correctness of the determination of carboxylic acids in liquids was evaluated using an Agilent Technological 7890B GC Systems. The difference in the results of acid determination between both methods (piezoelectric sensor and chromatography-mass spectrometry) does not exceed 6%. The modified piezosensors expand the potential of rapid determination of carboxylic acids in the intermediate products of ethyl alcohol production.

Electrochemical Micro-Reactor for the Determination of Intermediate Products in Fuel Cell Reactions

2019 ◽  
Vol 25 (1) ◽  
pp. 697-706 ◽  
Author(s):  
Jan O. Meier ◽  
Carsten Cremers ◽  
Jens Tübke
Keyword(s):  
Fuel Cell ◽  
Intermediate Products ◽  
Micro Reactor
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