Chromogenic Reaction of 1,1-Dimethylhydrazine with Aryltetrazolium Salts

A novel application of carbon nanotubes (CNTs) in the field of chromogenic reactions for recognizing aminophenol isomers was described. Among the three of aminophenol isomers, only p-aminophenol could form the chromogenic system. Comparative experiments proved that the absorption of the complex increased by 23.9% in the presence of CNTs due to the presence of the intact conjugated system. A selective determination of p-aminophenol was obtained

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Specificity of the chromogenic reaction of steroids with sulfuric acid

Chromatographia ◽

10.1007/bf02285017 ◽

1971 ◽

Vol 4 (6) ◽

pp. 266-266 ◽

Cited By ~ 1

Author(s):

I. Belič ◽

H. Sočič

Keyword(s):

Sulfuric Acid ◽

Chromogenic Reaction

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Synthesis of N-o-Methylphenyl-N′-(sodium p-aminobenzene-sulfonate) thiourea and Its Chromogenic Reaction with Palladium(II)

Analytical Sciences ◽

10.2116/analsci.22.989 ◽

2006 ◽

Vol 22 (7) ◽

pp. 989-992

Author(s):

Lei ZHANG ◽

Donglan MA ◽

Jianping LI ◽

Yulu WANG

Keyword(s):

Chromogenic Reaction

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Chromogenic reaction between p-dimethylaminobenzaldehyde and hydrogen peroxide

Analytical Chemistry ◽

10.1021/ac60288a005 ◽

1970 ◽

Vol 42 (6) ◽

pp. 659-670 ◽

Cited By ~ 1

Author(s):

Bibhuti R. DasGupta

Keyword(s):

Hydrogen Peroxide ◽

Chromogenic Reaction

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Determination of total free amino acids in Sipunculus nudus by UV spectrophotometry

E3S Web of Conferences ◽

10.1051/e3sconf/202018902013 ◽

2020 ◽

Vol 189 ◽

pp. 02013

Author(s):

Hongli Ye ◽

Youqiong Cai ◽

Longfei Zhang ◽

Wei Yu ◽

Yongfu Shi ◽

...

Keyword(s):

Amino Acids ◽

Free Amino Acids ◽

Free Amino ◽

Limit Of Detection ◽

Uv Spectrophotometry ◽

Aquatic Products ◽

Chromogenic Reaction ◽

Sipunculus Nudus ◽

Relative Standard ◽

Pretreatment Conditions

Here we developed a new, facile method to detect free amino acids (TFAA) in Sipunculus nudus by UV spectrophotometry. The pretreatment conditions of the approach were optimized, such as chromogenic reaction temperature and time, the measurement time after chromogenic reaction, the extraction agent and its concentration, the extraction time. The established method showed a good linearity in the TFAA range 0.0 ~ 40.0 cg/mL (R2= 0.9958) with the limit of detection (LOD) 1.96 g /mL and the precision of 6.14 % (relative standard deviation, RSD). The addition standard recoveries were 95.1 % ~108.6 %. Finally, the method was successfully applied in detection of TFAA in Sipunculus nudus and other aquatic products. The results showed that the content of TFAA in Sipunculus nudus was higher than that in the other aquatic products collected in our paper, and as high as 138.14 g/kg.

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