Enzymatic Assay Of Estrogens: A Further Development In The Enzymatic Determination Of Androgens And A Report On A Two-Year Experiment In Obstetrics And Gynecology

1982 ◽  
pp. 1329-1334 ◽  
Author(s):  
Jean-Claude Nicolas ◽  
Yamina Chikhaoui ◽  
Bernard Descomps ◽  
André Crastes de Paulet
Keyword(s):  
Enzymatic Assay ◽  
Obstetrics And Gynecology ◽  
Enzymatic Determination ◽  
Further Development

Enzymatic determination of D-alanine with L-alanine dehydrogenase and alanine racemase

2021 ◽  
Author(s):  
Hiroyuki Ashida ◽  
Yoshihiro Sawa ◽  
Tohru Yoshimura
Keyword(s):  
Water Soluble ◽  
Enzymatic Assay ◽  
Assay System ◽  
Alanine Racemase ◽  
Alanine Dehydrogenase ◽  
Enzymatic Determination

Abstract An enzymatic assay system of D-Ala, which is reported to affect the taste, was constructed using alanine racemase and L-alanine dehydrogenase. D-Ala is converted to L-Ala by alanine racemase and then deaminated by L-alanine dehydrogenase with the reduction of NAD+ to NADH, which is determined with water-soluble tetrazolium. Using the assay system, the D-Ala contents of seven crustaceans were determined.

Interference by endogenous glycerol in an enzymatic assay of phosphatidylglycerol in amniotic fluid.

1988 ◽  
Vol 34 (3) ◽  
pp. 560-563 ◽  
Author(s):  
D A Herold ◽  
A E Reed
Keyword(s):  
Amniotic Fluid ◽  
Fetal Lung ◽  
Enzymatic Assay ◽  
Glycerol Concentration ◽  
Glycerol Content ◽  
Important Indicator ◽  
Enzymatic Determination ◽  
Total Glycerol ◽  
Lung Maturity

Abstract We investigated the possibility of interference by endogenous glycerol with the enzymatic measurement of phosphatidylglycerol in amniotic fluid. Phosphatidylglycerol is an important indicator of fetal lung maturity. The concentrations of glycerol and phosphatidylglycerol in amniotic fluid were measured by using a coupled enzymatic assay with and without phospholipase D (EC 3.1.4.4). The precision of the assay was acceptable (within-run CV = 1.2%, between-run CV = 4.8%). Endogenous glycerol content was demonstrated to be approximately 10-20 times that of phosphatidylglycerol. This high proportion of endogenous glycerol in amniotic fluid would preclude the accurate enzymatic determination of amniotic fluid phosphatidylglycerol unless the glycerol is first removed. Nor can the actual phosphatidylglycerol concentration be determined by subtracting the endogenous glycerol concentration from the total glycerol, which includes that glycerol derived from phosphatidylglycerol. With a usual range of 9 +/- 7 mumol/L, the error for a given phosphatidylglycerol measurement of +/- 6.6 mumol/L (+/- 2 SD) clearly is too high for this assay to be clinically useful. There was no correlation between concentration of endogenous glycerol or apparent phosphatidylglycerol in amniotic fluid and the lecithin/sphingomyelin ratio of the sample.

Enzymatic determination of D-mannose in serum.

1984 ◽  
Vol 30 (2) ◽  
pp. 293-294 ◽  
Author(s):  
K Soyama
Keyword(s):  
Healthy Volunteers ◽  
Glucose Oxidase ◽  
Fungal Infections ◽  
Enzymatic Assay ◽  
Glucosephosphate Isomerase ◽  
Enzymatic Determination ◽  
Endogenous Glucose ◽  
Glucose 6 Phosphate Dehydrogenase

Abstract A new and simple enzymatic assay for measuring D-mannose in serum is described. Endogenous glucose is eliminated from serum by use of glucose oxidase (EC 1.1.3.4) and catalase (EC 1.11.1.6). D-Mannose concentration is calculated from the increase in NADH formation after mannosephosphate isomerase (EC 5.3.1.8) is added. This increase is a result of coupling the following series of enzymes: hexokinase (EC 2.7.1.1), glucosephosphate isomerase (EC 5.3.1.9), and glucose-6-phosphate dehydrogenase (EC 1.1.1.49, NAD+-dependent). The study included subjects who were healthy volunteers and patients with suspected or proven fungal infections.

Ames Award Lecture 1972. An Investigation of the Determination of Serum Cholesterol by an Enzymatic Method

1973 ◽  
Vol 10 (1-6) ◽  
pp. 79-84 ◽  
Author(s):  
Heather M. Flegg
Keyword(s):  
Serum Cholesterol ◽  
Enzymatic Assay ◽  
Total Serum ◽  
Total Serum Cholesterol ◽  
Enzymatic Method ◽  
Enzymatic Determination ◽  
Cholesterol Determination

The enzymatic determination of total serum cholesterol is described. The source of the enzyme cholesterol dehydrogenase is the bacterium Nocardia erythropolis. A comparison is made between the enzymatic assay and an automated Liebermann-Burchard serum cholesterol determination.

Enzymatic Determination of Hydroxysteroids in Human Skin Surface Lipids1

1963 ◽  
Vol 41 (5) ◽  
pp. 265-268 ◽  
Author(s):  
Thomas J Cook ◽  
Allan L Lorincz ◽  
Alan R Spector
Keyword(s):  
Human Skin ◽  
Skin Surface ◽  
Enzymatic Determination

Enzymatic colorimetry of lecithin and sphingomyelin in aqueous solution.

1983 ◽  
Vol 29 (8) ◽  
pp. 1513-1517 ◽  
Author(s):  
M W McGowan ◽  
J D Artiss ◽  
B Zak
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Amniotic Fluid ◽  
Enzymatic Reaction ◽  
Detergent Solution ◽  
Enzymatic Determination ◽  
Red Color ◽  
Hydrolysis Of ◽  
Zwitterionic Detergent

Abstract A procedure for the enzymatic determination of lecithin and sphingomyelin in aqueous solution is described. The phospholipids are first dissolved in chloroform:methanol (2:1 by vol), the solvent is evaporated, and the residue is redissolved in an aqueous zwitterionic detergent solution. The enzymatic reaction sequences of both assays involve hydrolysis of the phospholipids to produce choline, which is then oxidized to betaine, thus generating hydrogen peroxide. The hydrogen peroxide is subsequently utilized in the enzymatic coupling of 4-aminoantipyrine and sodium 2-hydroxy-3,5-dichlorobenzenesulfonate, an intensely red color being formed. The presence of a non-reacting phospholipid enhances the hydrolysis of the reacting phospholipid. Thus we added lecithin to the sphingomyelin standards and sphingomyelin to the lecithin standards. This precise procedure may be applicable to determination of lecithin and sphingomyelin in amniotic fluid.

Non-enzymatic determination of purine nucleotides using a carbon dot modified glassy carbon electrode

2019 ◽  
Vol 11 (30) ◽  
pp. 3866-3873 ◽  
Author(s):  
R. Karthikeyan ◽  
D. James Nelson ◽  
S. Abraham John
Keyword(s):  
Glassy Carbon ◽  
Low Cost ◽  
Phosphate Buffer Solution ◽  
Purine Nucleotides ◽  
Buffer Solution ◽  
Solution Ph ◽  
Carbon Dot ◽  
Enzymatic Determination ◽  
Sensitive Determination

Selective and sensitive determination of one of the purine nucleotides, inosine (INO) using a low cost carbon dot (CD) modified glassy carbon (GC) electrode in 0.2 M phosphate buffer solution (pH 7.2) was demonstrated in this paper.

scholarly journals The Molecular Bases Study of the Inherited Diseases for the Health Maintenance of the Beef Cattle

Genes ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 678
Author(s):  
Elena Konovalova ◽  
Olga Romanenkova ◽  
Olga Kostyunina ◽  
Elena Gladyr
Keyword(s):  
Dna Analysis ◽  
Genetic Defects ◽  
Health Maintenance ◽  
Angus Cattle ◽  
Hereford Cattle ◽  
Pcr Rflp ◽  
Cattle Herds ◽  
Molecular Bases ◽  
Further Development

The article highlighted the problem of meat cattle genetic defects. The aim was the development of DNA tests for some genetic defects diagnostics, the determination of the animal carriers and their frequencies tracking in time. The 1490 DNA samples from the Aberdeen Angus (n = 701), Hereford (n = 385), Simmental (n = 286) and Belgian Blue (n = 118) cattle have been genotyped on the genetic defects by newly created and earlier developed DNA tests based on AS-PCR and PCR-RFLP methods. The Aberdeen Angus cattle genotyping has revealed 2.38 ± 0.31% AMC-cows and 1.67 ± 0.19 % AMC-bulls, 0.65 ± 0.07% DDC-cows and 0.90 ± 0.10% DDC-bulls. The single animals among the Hereford cattle were carriers of MSUD and CWH (on 0.27 ± 0.05%), ICM and HY (on 0.16 ± 0.03%). The Simmental cattle were free from OS. All Belgian Blue livestock were M1- and 0.84%-CMD1-carriers. The different ages Aberdeen Angus cattle genotyping has shown the tendency of the AMC- and DDC frequencies to increase in the later generations. The statistically significant increase of DDC of 1.17% in the cows’ population born in 2019 compared to those born in 2015 allows concluding the further development of the DNA analysis-based measures preventing the manifestation of the genetic anomalies in meat cattle herds is necessary.

Sign in / Sign up

Export Citation Format

Share Document