Improved Ferric Chloride Test for Phenols

Abstract

All colors (listed) represent distinct color changes when compared to the colors of the solutions of compounds in the appropriate solvents. In these cases the test is considered positive. In all other cases the test is considered negative and is indicated by Neg, An arrow indicates a change in color upon addition of more reagent.

Histochemical Localization of Phenols in Healthy and Diseased Banana Roots

“…However, a nninl)er of other types of phenols also gi\e a green color with this reagent |I9). The (tccnrren<(' of the reaction and the color produced when phenols react wilh I'"e{'J,i is often a function of (he solvent n.sfd (19). The green color is of vaUie.…”

Mode of action of GR69153, a novel catechol-substituted cephalosporin, and its interaction with the tonB-dependent iron transport system

“…1) is a novel broad-spectrum cephalosporin incorporating a catechol-substituted 7-aminothiazolyl-oxime and may mimic a catechol siderophore, binding iron and thereby using the iron transport system for entry into cells. The chelating activity of GR69153 to metal ions was measured by spectrophotometrically scanning the absorbance from 200 to 900 nm (19). A GR69153 solution became blue-green when FeCl3 was added, corresponding to an increase in optical density in the region 400 to 800 nm (Fig.…”

HISTOCHEMICAL INVESTIGATION OF TRICHOMES AND CHEMICAL COMPOSITION OF ESSENTIAL OIL FROM Euphrasia stricta D. Wolff ex J.F. Lehm. (OROBANCHACEAE)

“…Other fragments were embedded for 1 min in Nile Blue, which is used to examine neutral and acidic lipids [Jensen 1962]. Moreover, the plant fragments were treated with Ruthenium Red for 5 min to determine polysaccharides other than cellulose [Johansen 1940], 1% potassium dichromate for 10 min to detect tannins, and 2% ferric trichloride for 10 min to identify phenolic compounds [Johansen 1940, Soloway and Wilen 1952, Gabe 1968. Furthermore, a reaction with concentrated sulphuric acid was performed to detect sesquiterpenes [Cappelletti et al 1986].…”