The colorimetric reaction between vitamin A2 aldehyde and antimony trichloride.

A Study of the Antimony Trichloride Color Reaction for Vitamin A. Ii. the Dilution Curve of Cod Liver Oil with Antimony

In a previous paper of this series (1) we have shown that while the dilution curve for cod liver oil with antimony trichloride is not a linear function, a comparison can be made between the colorimetric assay of vitamin A in certain fish oils, with a chloroform solution of antimony trichloride, and the biological assay upon the same oils, when certain precautions are taken. In a second paper (2...

An Efficient Synthesis of 3,4-Dihydropyrimidin-2-(1H)-one Derivatives Promoted by Antimony Trichloride under Thermal and Solvent-free Conditions

An efficient and simple one-pot approach for the synthesis of 3,4-dihydropyrimidin-2-(1H)-one derivatives using antimony trichloride (SbCl3) as a mild catalyst by means of three-component Biginelli reaction between β-keto esters, aldehyde derivatives and urea/thiourea under thermal and solvent-free conditions with excellent yields and short reaction times is reported. This m...

Cxxviii. Spectrophotometric Investi- Gations of the New Vitamin a Colour Test. by Eugene Rosenthal And

COLORIMETRIC determination of vitamin A has frequently been based upon the Carr-Price reaction, namely the production of a blue colour when vitamin A is added to a saturated solution of antimony trichloride in chloroform, which shows two absorption maxima at 606 m,u and at 572 m,u, respectively. This reaction has the following drawbacks: (1) the blue colour is not specific for vitamin A, being ...

Spectrophotometric Study of a New Colorimetric Reaction of Vitamin A* by Albert E. Sobel

This paper deals with a new calorimetric reaction of vitamin A with glycerol 1,3-dichlorohydrin (which we henceforth will refer to as GDH) that appears to be suitable for the quantitative estimation of this vitamin. The estimation of vitamin A in vitro has been the subject of many reviews in recent years (l-6). The two widely used methods at present are the ultraviolet absorption at 325 to 328 ...

Ccxl. Spectrographic Studies on the Antimony Trichloride Reaction for Vitamin A. I. the Relation between Tintometer Readings and Spectral Absorption of the Blue