scholarly journals THE DETERMINATION OF SULFANILAMIDE IN TUNGSTIC ACID BLOOD FILTRATES BY MEANS OF SODIUM β-NAPHTHOQUINONE-4-SULFONATE

1938 ◽  
Vol 122 (3) ◽  
pp. 757-762
Author(s):  
E.G. Schmidt
Keyword(s):  
Tungstic Acid

DETERMINATION OF GLUCOSE IN FISH BLOOD: A MODIFICATION OF THE FOLIN–MALMROS MICROPROCEDURE

1958 ◽  
Vol 36 (11) ◽  
pp. 1121-1124 ◽  
Author(s):  
Leonard R. Murrell ◽  
Paul F. Nace
Keyword(s):  
Blood Glucose ◽  
Prussian Blue ◽  
Tungstic Acid ◽  
Sodium Lauryl Sulphate ◽  
Blood Proteins ◽  
Colorimetric Measurement ◽  
Efficient Separation ◽  
Fish Blood

A modification of the Folin–Malmros micromethod is described for the determination of fish blood glucose. A more efficient separation of blood proteins is obtained by precipitating 0.1 ml blood in 10.0 ml tungstic acid. This is followed by hot alkaline reduction of ferricyanide, and colorimetric measurement of a Prussian blue – sodium lauryl sulphate suspension. The method, which eliminates certain difficulties found in other procedures, has been successfully applied in more than a thousand analyses of blood from two species of fish (Opsanus and Ictalurus) having glucose concentrations between 15 and 250 mg per cent.

128. The Determination of Lactose and Glucose in Milk

1936 ◽  
Vol 7 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Tudor Stanley George Jones
Keyword(s):  
Tungstic Acid ◽  
Reducing Sugar ◽  
Ferment Lactose

1. The application of the method of Somogyi to the determination of the reducing sugar in milk, with a precision of ± 0·36 per cent., is described.2. Washed yeast does not ferment lactose and does not add reducing material to tungstic acid nitrates.3. The reducing substance in milk removable by yeast can be determined with an accuracy of ± 3 per cent.

Determination of iron in tungsten and tungstic acid

1939 ◽  
Vol 11 (5) ◽  
pp. 254-256 ◽  
Author(s):  
M. L. Holt ◽  
Donald Swalheim
Keyword(s):  
Tungstic Acid

scholarly journals Determination of protein and reactive lysine in leaf-protein concentrates by dye-binding

1979 ◽  
Vol 42 (3) ◽  
pp. 445-454 ◽  
Author(s):  
Ann F. Walker
Keyword(s):  
Convenient Method ◽  
Nutritional Value ◽  
Tungstic Acid ◽  
Leaf Protein ◽  
Processing Conditions ◽  
Acid Orange ◽  
Protein Concentrates ◽  
Dye Binding ◽  
Available Lysine

1. Twenty leaf-protein concentrates (LPC), were produced from different crops and by different processes, the latter being designed to retain maximum nutritional value of the samples.2. The establishment of conditions for the use of CI Acid Orange 12 in a commercial dye-buffer reagent for the determination of protein and reactive (available) lysine in LPC was investigated.3. Values for protein by dye-binding correlated well with those for tungstic-acid-precipitated nitrogen (×6.25).4. Some LPC samples showed a loss of reactive lysine, the greatest loss being associated with the most severe processing conditions.5. For the LPC samples studied, dye-binding provided a convenient method for the concurrent determination of protein and reactive lysine.

The Determination of Chlorides in Blood by Direct Mercurimetric Titration of Tungstic Acid Filtrates*

1941 ◽  
Vol 11 (ts5_4) ◽  
pp. 115-118 ◽  
Author(s):  
Allen Gold ◽  
H. C. Ebendorf ◽  
J. L. Lattimore
Keyword(s):  
Tungstic Acid

THE DETERMINATION OF GALACTOSE IN SMALL AMOUNTS OF BLOOD

1957 ◽  
Vol 35 (11) ◽  
pp. 935-943 ◽  
Author(s):  
H. M. Czajkowska Robinson ◽  
J. C. Rathbun
Keyword(s):  
Tungstic Acid ◽  
Fermentable Sugar

A method for the determination of blood galactose in 0.1 ml. samples was developed in which the glucose is removed by treatment with yeast. Modified dilutions of Somogyi and Nelson reagents are used and the non-fermentable sugar is determined colorimetrically at 680 millimicrons. A comparison of three protein precipitants led to the choice of tungstic acid. The range covered by the method is 6–50 mg. %, corresponding to 2–16 micrograms of galactose per sample.

Determination of Amphetamine, Methamphetamine, and Related Amines in Blood and Urine by Gas Chromatography with Hydrogen-Flame Ionization Detector

1970 ◽  
Vol 16 (3) ◽  
pp. 195-200 ◽  
Author(s):  
Paul Lebish ◽  
Bryan S Finkle ◽  
J W Brackett
Keyword(s):  
Tungstic Acid ◽  
Retention Data ◽  
Blood Proteins ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Nonpolar Column ◽  
Hydrogen Flame ◽  
Gas Chromatographic Method ◽  
Extracting Solvent

Abstract A sensitive gas-chromatographic method suitable for clinical and forensic purposes is presented for measuring methamphetamine, amphetamine, and other phenethylamines in blood and urine. When testing blood, we include a known quantity of a homologous standard, n-propylamphetamine hydrochloride, in the tungstic-acid solution used to precipitate blood proteins; the acid filtrate is washed, alkalinized, and extracted with ether. Extracted phenethylamines are converted to the corresponding acetamides, which are then concentrated and gas-chromatographed. The method for urine is similar except the known quantity of n-propylamphetamine hydrochloride is added to the sample, the protein precipitation is omitted, and chloroform is the extracting solvent. Suitable tests are described for the more stringent confirmation of amphetamine and methamphetamine required for court testimony. Retention data obtained from both a polar and a nonpolar column packing are presented for over 50 compounds related to phenethylamine.

THE DETERMINATION OF GALACTOSE IN SMALL AMOUNTS OF BLOOD

1957 ◽  
Vol 35 (1) ◽  
pp. 935-943
Author(s):  
H. M. Czajkowska Robinson ◽  
J. C. Rathbun
Keyword(s):  
Tungstic Acid ◽  
Fermentable Sugar

A method for the determination of blood galactose in 0.1 ml. samples was developed in which the glucose is removed by treatment with yeast. Modified dilutions of Somogyi and Nelson reagents are used and the non-fermentable sugar is determined colorimetrically at 680 millimicrons. A comparison of three protein precipitants led to the choice of tungstic acid. The range covered by the method is 6–50 mg. %, corresponding to 2–16 micrograms of galactose per sample.

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