Nitrous Acid Method for Determination of Rescinnamine

Abstract Two types of urine protein dipsticks and the sulfosalicylic acid method were compared for their accuracy and specificity, with use of urine samples supplemented with various proteins. Dipsticks yield accurate results when the protein under consideration is restricted to albumin; the sulfosalicylic acid method accurately determines many kinds of proteins in addition to albumin. Detergents affect each of the methods, but changes in salt concentration only affect results by dipstick procedures. Dipsticks, which are based on the protein-error principle for indicators, are subject to some of the conditions that apply to the bromcresol green method for serum albumin determination.

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A STUDY OF THE PHENOLSULFONIC ACID METHOD FOR THE DETERMINATION OF NITRATES IN WATER. [FOURTH PAPER.] A MODIFIED PHENOLSULFONIC ACID METHOD.

Journal of the American Chemical Society ◽

10.1021/ja02216a014 ◽

1911 ◽

Vol 33 (3) ◽

pp. 381-384 ◽

Cited By ~ 8

Author(s):

E. M. Chamot ◽

D. S. Pratt ◽

H. W. Redfield

Keyword(s):

Acid Method

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Nucleotide Clusters in Deoxyribonucleic Acids. VIII. The Pyrimidine Oligonucleotides of Bacteriophage S13 Wild Type DNA

Canadian Journal of Biochemistry ◽

10.1139/o73-157 ◽

1973 ◽

Vol 51 (8) ◽

pp. 1206-1211 ◽

Cited By ~ 7

Author(s):

John H. Spencer ◽

Lynn Boshkov

Keyword(s):

Nitrous Acid ◽

Wild Type ◽

Amber Mutant ◽

Labelling Technique

A method for determination of the compositional assignment and comparison of the oligonucleotides in longer pyrimidine isostichs from closely related DNA's is described. The method is a dual 32P/33P labelling technique and has been used to investigate the pyrimidine oligonucleotide catalogue of bacteriophage S13 wild type DNA by comparison with the catalogue of the nitrous acid amber mutant S135suN15. The isomeric compositions of the dinucleotide CTp3 and trinucleotides CT2p4 and C2Tp4 from both DNA's were examined also. No cytosine (C) → thymine (T) transitions had occurred in the longer pyrimidine isostichs 7–11 inclusive, which constitute 10% of the catalogue of each of the two S13 DNA's, the catalogues of the two DNA's being indistinguishable.

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Simultaneous Spectroscopic Determination of Gaseous Nitrous Acid and Nitrogen Dioxide in Polluted Indoor and Outdoor Air Environments

Advances in Air Sampling ◽

10.1201/9781315149837-19 ◽

2017 ◽

pp. 265-289

Author(s):

Heinz W. Biermann ◽

James N. Pitts ◽

Arthur M. Winer

Keyword(s):

Nitrogen Dioxide ◽

Nitrous Acid ◽

Spectroscopic Determination ◽

Outdoor Air ◽

Indoor And Outdoor

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Determination of Tranid Residues in Fresh Fruits, Vegetables, and Cottonseed

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/49.2.403 ◽

1966 ◽

Vol 49 (2) ◽

pp. 403-406

Author(s):

D P Johnson ◽

H A Stansbury

Keyword(s):

Nitrous Acid ◽

Acid Catalyzed

Abstract Tranid, 3-exo-chloro-6-endo-cyano-2-norbornanone O-(methylcarbamoyl)oxime, is an acaricide effective against both resistant and nonresistant strains of red and citrvis mites. Residvies of Tranid are determined in fresh frviit and vegetables as well as cottonseed by a combination of base- and acid-catalyzed hydrolysis to form hydroxylamine. The latter is then oxidized to nitrous acid which is determined colorimetrically. The compound is extracted from the crop with benzene and cleaned up by liquid partitioning. The method is sensitive to abovit 0.03 ppm of Tranid, and recoveries from all crops tested averaged 91.5 ± 4.4% over the range 0.05–3 ppm.

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Determination of Serum and Urinary Phenylalanine by Gas Chromatography

Clinical Chemistry ◽

10.1093/clinchem/19.5.496 ◽

1973 ◽

Vol 19 (5) ◽

pp. 496-498 ◽

Cited By ~ 4

Author(s):

Z K Shihabi ◽

G K Summer

Keyword(s):

Gas Chromatography ◽

Quantitative Analysis ◽

Nitrous Acid ◽

Gas Chromatograph ◽

Phenyllactic Acid ◽

Mild Conditions ◽

Amino Acid Analyzer ◽

Urine Specimens ◽

Serum And Urine

Abstract Phenylalanine in serum and urine was determined by gas chromatography after it was converted, by action of nitrous acid, to the corresponding hydroxy acid, phenyllactic acid. After extraction with ether, the phenyllactic acid was derivatized with bis(trimethylsilyl)trifluoroacetamide under mild conditions, and the product was injected directly into the gas chromatograph. The precision of the method was verified by recovery studies and by comparison with the results of quantitative analysis of phenylalanine on an amino acid analyzer. Urine specimens from normal infants and children and from patients with phenylketonuria were analyzed by this method to show that the procedure is applicable to diagnosis of the disorder.

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