Spot Test Detection and Colorimetric Determination of Aromatic Amines and Imino Heteroaromatic Compounds with 3-Methyl-2benzothiazolone Hydrazone

1961 ◽  
Vol 33 (6) ◽  
pp. 722-725 ◽  
Author(s):  
I. R. Cohen ◽  
A. P. Altschuller
Keyword(s):  
Aromatic Amines ◽  
Spot Test ◽  
Colorimetric Determination ◽  
Heteroaromatic Compounds

A Spot Test for Estimating Ureides in Soyabean Petioles

1986 ◽  
Vol 22 (4) ◽  
pp. 405-416 ◽  
Author(s):  
Richard A. Glenister ◽  
Thomas A. LaRue
Keyword(s):  
Nitrogen Fixation ◽  
Spot Test ◽  
Acetylene Reduction Activity ◽  
Colorimetric Determination ◽  
Reduction Activity ◽  
Nitrogen Fixation Activity ◽  
Bright Pink ◽  
Low Nitrogen ◽  
Petiole Segment

SUMMARYThe ureides allantoic acid and allantoin form a bright pink compound with acidic p-dimethylamino cinnamaldehyde. It is possible to estimate the ureide content of a soyabean petiole segment by crushing it on filter paper and developing the colour with this reagent. There is a strong correlation between the spot test and estimates from colorimetric determination of ureides. In field grown soyabeans, there was a positive correlation between the petiole ureide content during pod fill and the integrated seasonal acetylene reduction activity. The spot test can be used to identify plants with low nitrogen fixation activity.

Spot test and colorimetric determination of amines with trinitrobenzene

1983 ◽  
Vol 81 (5-6) ◽  
pp. 301-306 ◽  
Author(s):  
J. A. Vinson ◽  
J. F. Evans ◽  
H. E. Holets
Keyword(s):  
Spot Test ◽  
Colorimetric Determination

Titrimetric Determination of N,N′-Disubstituted p-Phenylenediamines

1962 ◽  
Vol 35 (3) ◽  
pp. 676-683 ◽  
Author(s):  
Otto Lorenz ◽  
C. R. Parks
Keyword(s):  
Rapid Detection ◽  
Spot Test ◽  
Nonaqueous Solvents ◽  
Oxidation Products ◽  
Colorimetric Determination ◽  
Titration Curves ◽  
Rubber Compounds ◽  
Titrimetric Determination

Abstract Three types of p-phenylenediamine derivatives used extensively as antioxidants and antiozonants in rubber compounds are N,N′-di-sec-alkyl-, N-sec-alkyl-N′-aryl-, and N,N′-diaryl-p-phenylenediamines. Available methods for these compounds are based mainly on a colorimetric determination of their colored oxidation products, the Wurster's salts or the p-quinonediimines. The deep coloration of the Wurster's salts was used as the basis of a spot test for the rapid detection of these diamines in rubber compounds. This test permits one to differentiate the three types of p-phenylenediamines. An investigation of the neutralization of p-phenylenediamines in nonaqueous solvents showed that N,N′-di-sec-alkyl- and N-sec-alkyl-N′-aryl-p-phenylenediamines could be determined readily in this way. The N,N′-diaryl derivatives did not give satisfactory titration curves because of their low basicity. By the addition of chloranil, however, diaryl-p-phenylenediamines were oxidized to the Wurster's salts with the formation of one equivalent of base which could be neutralized by acid. A similar procedure was applicable to the determination of N,N′-diaryl-p-quinonediimines, or mixtures of these diamines and diimines.

A Method for the Colorimetric Determination of β-Glucuronidase in Urine, Serum, Tissue; Assay of Enzymatic Activity in Health and Disease

1959 ◽  
Vol 36 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Julius A. Goldbarg ◽  
Esteban P. Pineda ◽  
Benjamin M. Banks ◽  
Alexander M. Rutenburg
Keyword(s):  
Enzymatic Activity ◽  
Colorimetric Determination ◽  
Health And Disease ◽  
Urine Serum
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