Topic
Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: A new method for the analysis of ubiquinones in various samples was developed using an HPLC system with postcolumn derivatization because of its high selectivity for ubiquinone detection.
7 citations
TL;DR: A spectrophotometric study showed that the orange-red color of tlic cobalt-isonitrosodimedone complex in 50 % alcohol may be used for the colorimetric determination, of cobalt.
7 citations
TL;DR: In this article, the color reaction was carried out in 70% acetone solution in order to decrease the solubility of the pigment, which was applied successfully to the colloidal iron reaction of acid mucopolysaccharides.
Abstract: In the Prussian Blue method for the histochemical demonstration of iron, some parts of produced pigment are considerably washed away during the dyeing process, because the pigment is water soluble. Consequently decrease and diffusion of the pigment occur and staining of the surrounding tissues take place. The color reaction was carried out in 70% acetone solution in order to decrease the solubility of the pigment. Obtaining the sharp and clear demarcation, this method was applied successfully to the colloidal iron reaction of acid mucopolysaccharides and very strong and clear reaction was obtained.
7 citations
TL;DR: A flow injection method for the determination of formaldehyde was developed in this paper, based on its reaction with 3-methyl-2-benzthiazolinone hydrazone (MBTH) to yield a blue formazan anion.
Abstract: A flow injection method for the determination of formaldehyde was developed. It is based on its reaction with 3-methyl-2-benzthiazolinone hydrazone (MBTH) to yield a blue formazan anion. Typically 180 μl samples are injected into a buffered carrier stream with a frequency of 30 per hour. This sample line merges with the reagent stream containing MBTH, whereupon an azine is formed. After merging with a second stream containing an acidic solution of FeCl3 as reagent, MBTH is oxidized to an intermediate that attacks the azine yielding the formazan dye with an ɛmax at 635 nm. The method was applied to formaldehyde concentrations in the range from 0.15 mg/l to 15 mg/l. The relative standard deviation was 2.3% for 3 mg/l formaldehyde, and 5.1% for 0.3 mg/l, respectively. Strong reducing agents like nitrite interfere seriously. Out of the family of carbonyl compounds only acetaldehyde and propionaldehyde cause strong positive interference.
6 citations