Two compounds recognized as responsible for the insecticidal activity of extracts of Calceolaria andina L. (Scrophulariaceae) have been isolated and characterized as 2-(1, 1-dimethylprop-2-enyl)-3-hydroxy-1,4-naphthoquinone and the corresponding acetate, 2-acetoxy-3-(1,1-dimethylprop-2-enyl)-1, 4-naphthoquinone. Their activities against 29 pest species and 9 beneficial species of arthropod from...

In the present work, optimization of pectinase-assisted and tri-solvent-mediated extraction of lycopene from waste tomato peels was carried out. The optimized parameters for enzymatic pre-treatment were 2% pectinase concentration, pH 5.5, 4-h incubation, 45 °C and 150 rpm. Maximum recovery of lycopene from tomato peels using optimized tri-solvent extraction was achieved at 45 °C, 120-min incuba...

Oxidation of 1,8-dihydroxynaphthalene-3,6-disulphonic acid (CTA) and 1-amino-4-naphthalene sulphonic acid (ANS) by potassium peroxodisulphate leads to hydroxylation of these organic compounds. These oxidations may proceed through inner-sphere electron transfer as in case of ANS or by outer-sphere mechanism in case of CTA. The homolytic fission of S2O8 is the rate determining step in the oxidati...

A new series of fluorinated quinoline -1,4-dithiones 3(a-f) were obtained by the treatment 3-aryl-2-hydrazino-quinolines 1(a-f) with isobenzo furan-1,3-dithione 2 in presence p- toluene sulphonic acid (PTSA) solid state at room temperature as one pot. All products are monitored TLC and isolated GC furthermore confirmed spectral analysis.

Time-resolved visible and infrared absorption difference spectroscopy data at both 298 and 77 K were obtained using cyanobacterial menB (-) mutant photosystem I particles with several non-native quinones incorporated into the A1 binding site. Data was obtained for photosystem I particles with phylloquinone (2-methyl-3-phytyl-1,4-naphthoquinone), 2-bromo-1,4-naphthoquinone, 2-chloro-1,4-naphthoq...

15 We use a particle-tracking method to simulate several one-dimensional bi16 molecular reactive transport experiments. In our numerical scheme, the 17 reactants are represented by particles: advection and dispersion dominate 18 the flow, and molecular diffusion dictates, in large part, the reactions. The 19 particle/particle reactions are determined by a combination of two proba20 bilities dic...

Naphthalene cataract is probably due to peroxide production through naphthoquinone (NQ) redox cycling and/or glutathione conjugation. Both mechanisms yield losses of essential SH-groups in cristallins and are thus probably involved in protein modification finally visible as lens opacity. 1,2-Naphthoquinone produces H2O2 in the presence of either ascorbate, glutathione, NADH or--to a lesser exte...