1-Hy-droxy-4-prop-yloxy-9,10-anthra-quinone, C17H14O4, (I), and its acetyl derivative, 4-acet-yloxy-4-prop-yloxy-9,10-anthra-quinone, C19H16O5, (II), were synthesized from the commercially available dye quinizarin. In both compounds, the anthra-quinone frameworks are close to planarity. There is a large difference in the conformation of the prop-yloxy group; the mol-ecule of (I) adopts a gauche...

A simple and cost-effective optical sensing system based on quinizarin fluorescent dye (QZ) for the selective reversible of CH3COO? anions is reported. The anion binding affinity QZ towards different was monitored using electronic absorption fluorescence emission titration studies in DMSO. UV-visible spectrum showed a decrease intensity characteristic peaks at ? = 280, 323, 475 nm, while new pe...

l(8)-monoglucoside were non-mutagenic, as were the glucoside tetra-acetates of alizarin, chrysazin and quinizarin. When tested with the bacterial enzymes, all glucosides including the tetra-acetates were mutagenic for strain TA1537, apparently owing to formation of the free aglycones, alizarin, chrysazin, quinizarin and emodin, which are specific for strain TA11537. Emodin glucoside exhibited m...

The introduction of Registration, Evaluation and Authorisation of Chemicals (REACH), requires companies to register and risk assess all substances produced or imported in volumes of >1 tonne per year. Extrapolation methods which use existing data for estimating the effects of chemicals are attractive to industry, and comparative data are therefore increasingly in demand. Data on natural toxic c...