Use of Thymol-Sulfuric Acid Reaction for Determination of Carbohydrates in Biological Material

1957 ◽  
Vol 29 (3) ◽  
pp. 402-405 ◽  
Author(s):  
M. R. Shetlar ◽  
Y. F. Masters
Keyword(s):  
Sulfuric Acid ◽  
Biological Material ◽  
Acid Reaction

Determination of 3 β-hydroxysterols by the cysteine-sulfuric acid reaction

1972 ◽  
Vol 6 (3) ◽  
pp. 267-273
Author(s):  
R.A. McAllister ◽  
J.N. Crook ◽  
D.C. Smith ◽  
C. Mackay
Keyword(s):  
Sulfuric Acid ◽  
Acid Reaction

AN IMPROVED PREPARATIVE METHOD FOR D-ERYTHROSE 4-PHOSPHATE

1966 ◽  
Vol 44 (6) ◽  
pp. 663-669 ◽  
Author(s):  
A. S. Sieben ◽  
A. S. Perlin ◽  
F. J. Simpson
Keyword(s):  
Sulfuric Acid ◽  
Quantitative Determination ◽  
Preparative Method ◽  
Lead Tetraacetate ◽  
Barium Salt ◽  
Acid Reaction ◽  
Sugar Phosphates ◽  
Phenol Sulfuric Acid ◽  
Dowex 1

The oxidation of 1 mmole of D-glucose 6-phosphate with 1.7 mmoles of lead tetraacetate admixed with 1.8 mmoles of sulfuric acid yields a preparation containing 0.77 mmole of D-erythrose 4-phosphate and 0.20 mmole of unoxidized glucose 6-phosphate. The D-erythrose 4-phosphate is separated from the D-glucose 6-phosphate by chromatography on Dowex 1-formate, and recovered as the barium salt of the hydrazone in 50% yield. Evidence is presented that erythrose 4-phosphate may exist in monomeric and dimeric forms. Glucose 6-phosphate and erythrose 4-phosphate produce different colors in the phenol – sulfuric acid reaction. This can be used for the qualitative identification and quantitative determination of these sugar phosphates.

Determination of platinum in biological material by differential pulse polarography: Analysis in urine, plasma and tissue following sample combustion

1983 ◽  
Vol 48 (10) ◽  
pp. 2903-2908 ◽  
Author(s):  
Viktor Vrabec ◽  
Oldřich Vrána ◽  
Vladimír Kleinwächter
Keyword(s):  
Biological Material ◽  
Biological Fluid ◽  
Mercury Electrode ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Linear Calibration ◽  
Catalytic Current ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode

A method is described for determining total platinum content in urine, blood plasma and tissues of patients or experimental animals receiving cis-dichlorodiamineplatinum(II). The method is based on drying and combustion of the biological material in a muffle furnace. The product of the combustion is dissolved successively in aqua regia, hydrochloric acid and ethylenediamine. The resulting platinum-ethylenediamine complex yields a catalytic current at a dropping mercury electrode allowing to determine platinum by differential pulse polarography. Platinum levels of c. 50-1 000 ng per ml of the biological fluid or per 0.5 g of a tissue can readily be analyzed with a linear calibration.

Improved Method for the Determination of Ethylenebisdithiocarbamate Residues in Plants, Fruits, and Vegetables

1967 ◽  
Vol 50 (5) ◽  
pp. 1102-1108
Author(s):  
Charles F Gordon ◽  
Richard J Schuckert ◽  
William E Bornak
Keyword(s):  
Sulfuric Acid ◽  
Fruits And Vegetables ◽  
Analytical Procedure ◽  
Improved Method ◽  
Modified Method ◽  
Fungicide Residues ◽  
Crop Types ◽  
Large Representative

Abstract A modified method for the determination of dithiocarbamate fungicide residues on crops is presented. A large representative subsample of the frozen crop is blended in ice-cold deaerated water and an aliquot of the homogenate is added to the analytical apparatus containing hot 5 0% sulfuric acid. Dithiocarbamates are decomposed to evolve CS2 which is removed by a continuous gentle air-sweep from the digestion flask. Variations in technique allow the analysis of dithiocarbamate fungicide residues in several ranges, 1-10, 10-200, and 200-1000 /ig maneb. Recoveries from a wide variety of crops averaged 70 to 103%. Certain crop types present low recoveries and/or high apparent control values, but modifications in the analytical procedure are successful in solving these problems.

scholarly journals THE DETERMINATION OF IODINE IN BIOLOGICAL MATERIAL

1935 ◽  
Vol 110 (1) ◽  
pp. 29-38
Author(s):  
Virginia Trevorrow ◽  
Gladys J. Fashena
Keyword(s):  
Biological Material
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