Georg J.N., German physician and pharmaceutical chemist, 1836-1898. See: Dragendorff test, Dragendorff reagent.
References in periodicals archive ?
2010]), Dragendorff reagent (specific to alkaloids [Sherma 2000]), and Kedde reagent (indicating the presence of the g-lactone-[alpha],b-unsaturated subunit present in acetogenins [Caloprisco et al.
The analysis using Dragendorff reagent revealed orange spots at the base of the analytical plate, indicating the presence of polar alkaloids in this fraction, and absorption occurred at 365 nm after visualization using UV light (confirming the presence of compounds with a high conjugation of n bonds, observed in the alkaloids).
53 Plant fractions Post-derivatization Dragendorff KOH Visible Rf Visible 366 nm Rf Cissus populnea (Chloroform) Yellow 0 Cissus 0.
S3, Dragendorff reagent, prepared as in Clarke [11]
S6, iodinated Dragendorff reagent: 5 g of potassium iodide, 2 g of iodine, and 0.
3, blue fluorescent band under 365 nm, red after treatment with Dragendorff s reagent) (yield - 140 mg).
Primary screening was carried out using Dragendorff s and Mayer's reactions, and strain reselection was made by thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC) to identify the fermentation products of the selected strain.
The bioactive fraction contains two major spots of alkaloids, sprayed with Dragendorff s reagent, with several minor components on a thin-layer chromatography (TLC) (silica gel 60GF, chloroform/methanol 9:1).
The exclusion of alkaloids and nitric compounds was confirmed by Dragendorff staining, and matrine and oxymatrine, the two major alkaloids of S.
2]O (4:1:1), and was detected by iodine vapor and Dragendorff regent.
The phytochemical screening of AEx revealed the following constituents: a saponin [foam (-)]; an alkaloid [Bouchardat (-), Mayer (-), Dragendorff (-), tungstosilicic acid (-)]; steroids (+); tannins [gelatin (+), Fe[Cl.
Folin-Ciocalteu and Dragendorffs reagent was purchased from Merck, Germany.