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: The developed chlorine-o-tolidine method is relatively inexpensive and less laborious than the standard (Spectroquant) procedure, and insensitive to the common interferent, cyanate (CNO(-)).
31 citations
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TL;DR: It will be shown that the color produced when a mixture of sulfuric and acetic acids is heated with the deproteinized serum sample is also probably due to sialic acid.
Abstract: cal usefulness of a color reaction given by serum with the diphenylamine reagent of Dische. It has been shown that the purple color produced in this reaction is probably due to the presence of a deoxyhexose structure in the sialic acid molecule (5). Sialic acid, or a closely related substance, appears to be a common constituent of mucoproteins (glycoproteins) including orosomucoid of serum (6, 7). The color produced in the diphenylamine reaction reflects the concentration of the mucoproteins in the serum being tested. In our experience, and as reported by Anderson and Maclagan (8), the color developed with diphenylamine appears to be a specific reaction of mucoproteins. An elevation in the mucoproteins found in the alpha globulin fraction of serum is characteristic of many diseases (7). As pointed out in a previous report (4) a constant feature of the diphenylamine reaction was the concomitant rise in the color index of the "serum blank" associated with the increased color intensity of the serum samples tested. The "serum blank" in this instance was the combination of deproteinized serum with the sulfuric acetic acid mixture which did not contain diphenylamine. This report will consider the chemical and clinical aspects of the "serum blank" reaction. It will be shown that the color produced when a mixture of sulfuric and acetic acids is heated with the deproteinized serum sample is also probably due to sialic acid. The simplicity of the test suggests its usefulness as a new method for measuring the intensity of inflammation.
30 citations
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30 citations
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22 Dec 1994
TL;DR: In this paper, a thermochromic color-memory composition consisting of a homogeneous solubilized mixture of essential three components of an electrondonating color-developing organic compound, an electron-accepting compound, and a reaction medium for controlling a color reaction of the component with the component was presented.
Abstract: A thermochromic color-memory compositions exhibiting high color contrast between high color density in a colored state and sufficiently low color density in a decolored state with high freedom of selection of the reaction medium, and highly useful as a thermochromic material. The thermochromic color-memory composition comprises a homogeneous solubilized mixture of essential three components of (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium for controlling a color reaction of the component (a) with the component (b); the component (c) being selected from aliphatic ketones of 10 to 22 total carbons and aryl alkyl ketones of 12 to 24 total carbons; and the composition changing the color thereof with a large hysteresis width (ΔH) of from 8° C. to 80° C.
30 citations
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TL;DR: Two sensitive methods for the determination of phenothiazine derivatives based on the formation of coloured salts of these drugs formed with Brilliant Blue or Orange-II in the presence of 0.1 M HCl are described.
30 citations