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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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Journal ArticleDOI
TL;DR: Three new pyridoxine-glycosides were isolated from rice bran as colorless powder by various chromatographic techniques and were concluded to be 4'-O-(beta-D-glucosyl)-5'-O(beta-cellobiosyl)pyrid Oxine, and compound C to be 5'-O-beta- glucotriosyl-5'-o-(beta
Abstract: Three new pyridoxine-glycosides were isolated from rice bran (10kg) as colorless powder by various chromatographic techniques: compound A, 53mg; compound B, 7.8mg; compound C, 5.8mg. Compound A was shown to consist of pyridoxine and glucose in a 1:2 molar ratio by β-glucosidase hydrolysis, and by 1H-NMR and secondaryion mass spectrometry (SI-MS) data. On partial acid hydrolysis of the compound, cellobiose was liberated. Compound A showed the positive Gibbs color reaction, but the reaction was negative in the presence of boric acid. Thus, compound A was identified as 5'-O-(β-cellobiosyl)pyridoxine. The 13C-NMR spectral data were compatible with this structure. Compounds B and C were proven to be triglucosides of pyridoxine by enzymic hydrolysis and SI-MS data. From the results of the Gibbs color reaction and partial hydrolyses which yielded compound A, compound B was concluded to be 4'-O-(β-D-glucosyl)-5'-0-(β-cellobiosyl) pyridoxine, and compound C to be 5'-O-(β-glucotriosyl) pyridoxine in which a glucose molecule was bound to the cellobiosyl moiety of compound A through β-glycosidic linkage.

13 citations

Journal ArticleDOI
TL;DR: A simplified, rapid, and universal colorimetric platform based on the peroxidase-mimicking activity of I− for sensing applications is proposed and it is believed that the general platformbased on the H2O2 + TMB + I− reaction holds broader applications in other analytical systems.

13 citations

Journal ArticleDOI
Alaa S. Amin1
TL;DR: In this article, a cloud-point preconcentration process using micelle of the cationic surfactant cetyltrimethylammonium bromide to extract Pd(II) from aqueous solutions was investigated.

13 citations

Journal ArticleDOI
TL;DR: In this paper, the orange color complex formed by platinum(IV) with o-phenylenediamine at the p h range 3-4 forms the basis of sensitive colorimetric method for determination of the metal.

13 citations

Journal ArticleDOI
TL;DR: A simple and sensitive spectrophotometric method for the determination of trace amounts of hydrogen sulfide after fixation in a zinc acetate trapping solution is described in this paper, where the fixed sulfide was made to react with formaldehyde to form a hydrosulfide adduct which reacts with pararosaniline in an acid medium to form colored product.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20227
20214
20206
20198
20186
20175