The mechanisms of electrochemical capture of CO2 via redox cycle of 1,4-naphthoquinone (1,4-NQ), 2,3-dichloro-1,4-naphthoquinone (DCNQ) and 2-chloro-1,4-naphthoquinone (CNQ) in 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) have been investigated by cyclic voltammetry (CV) and in-situ F...

The rapid interaction between 2,3-dichloro-1,4-naphthoquinone (DClNQ) and n-butylamine results in the formation of 2N(n-butylamino)-3-chloro-1,4-naphthoquinone as the final product. The reaction is found to proceed through the initial formation of charge-transfer (CT) complex as an intermediate....

Reactions of 2,3-dichloro-1,4-naphthoquinone with o/m and p-aminophenols are studied. It was shown that reaction with 2-aminophenol results in 6-chloro-12a-methoxy-7H-benzo[c]phenozaxine-5(12aH)-one (1a) as the major product along with (6-chloro-12a-hydroxy-7H-benzo[c]phenoxazine-5(12aH)-one) (1...

Both endogenous and synthetic (e.g. drugs) quinones are essential functional moieties in various biological systems and their activity is mainly governed by their electrochemical properties. In recent years they are also more readily applied in novel energy storage devices, such as batteries and...

Dietary administration of the dyestuff intermediate 2-aminoanthraquinone (AAQ) at a 2% level for periods of 2, 4, 8 or 12 weeks decreased the total liver vitamin A significantly (P

Feeding of the carcinogen 2-aminoanthraquinone (2-AAQ) to female Fischer 344 rats increased the content of liver cytochrome P-450, cytochrome b5, and increased the activity of NADPH-cytochrome c reductase as early as 2 weeks. Benzo[a]pyrene hydroxylase, epoxide hydrolase, and α-naphthol-O-glucu...

Unusual reactivity of 1-aminoanthraquinone with a number of isatins and aryl alkynes in a copper catalyzed multicomponent reaction afforded a novel, highly conjugated, and separable regioisomers of 3-spiroheterocyclic 2-oxindoles in excellent combined yield. Both the regioisomers exhibited consi...

A series of novel, monobenzyl substituted, 1-aminoanthraquinones, monobenzyl substituted 2-aminoanthraquinones and bisbenzyl substituted 2-aminoanthraquinones were synthesized via the benzylation of 1-/2-aminoanthraquinone, respectively. The benzyl substituted aminoanthraquinone derivatives were...

The adsorption state of anthraquinone-2-carboxylic acid (AQ-2-COOH) deposited from acetone solutions (0.01–1.00 mg/ml) on native oxide surfaces of Al films was characterized by inelastic electron tunneling spectroscopy, infrared reflection absorption spectroscopy, and X-ray photoelectron spectr...

The physicochemical properties of 9,10-anthraquinone-2- carboxylic acid (AQCA) were investigated by thermal analysis, powder X-ray diffraction pattern, solubility, and partition coefficient. The chemical structure of AQCA was confirmed by the data from UV, Fourier transform IR (FTIR), and NMR an...

Islandicin, a mould metabolite, can be synthesised in a few, robust, high yielding steps. This procedure can be further elaborated to give a variety of hydroxy-9,10-anthraquinone-2-carboxylic acids.

Horseradish peroxidase (HRP)-modified electrodes are among the most frequently used detectors for measuring the amount of H2O2 as well as organic hydroperoxides. The major requirement for the construction of HRP-modified electrodes is to establish a fast and efficient electron transfer contact b...

We developed an efficient method for the generation of hydrogen peroxide by aerobic photooxidation of 2-propanol using anthraquinone-2-carboxylic acid and molecular oxygen in air and visible light from fluorescent lamps. One-pot epoxidation of α,β-unsaturated ketones using the generated hydrog...

A convenient metal-free oxidation protocol of various cyclic acetals with molecular oxygen and anthraquinone-2-carboxylic acid under visible light irradiation by a fluorescent lamp afforded their corresponding hydroxyalkyl esters.

We developed the aerobic photooxidative bromination of aromatic compounds using carbon tetrabromide in the presence of anthraquinone-2-carboxylic acid under visible light irradiation.

In this study, in situ surface-enhanced Raman scattering (SERS) spectroelectrochemistry and angle-resolved X-ray photoelectron spectroscopy (AR-XPS) are used to investigate the redox reaction and adsorption behavior of anthraquinone-2-carboxylic acid (AQ-2-COOH) on an Ag electrode at different p...

The fluorescence and phosphorescence spectra and quantum yields of 2-amino-, 2-hydroxy- and 2-amino-3-hydroxyanthraquinones have been recorded in a variety of solvents and these data have been linked to studies on the light stabilities of the compounds in man-made polymers. Strong fluorescence i...

A high-performance liquid chromatographic (HPLC) method with ultraviolet detection for the determination of quinine in rat biological fluids is described. Due to its selectivity and sensitivity, the proposed method can be used in the case of such rat biological fluids as cerebrospinal fluid (CSF...

Quinine intoxication causes a well-described syndrome that includes tinnitus, sensorineural hearing loss and vertigo. The pathophysiology of quinine’s effects on hearing is unknown, but may include a peripheral component. The cochlear outer hair cell is known to be motile and to contribute forc...

The aim of this study was to find out the effect of low-level laser therapy (LLLT) on salicylate-induced tinnitus in the rat model. Fourteen Sprague-Dawley rats (8 weeks; 240–280 gm) were divided into 2 groups (study group, control group). Rats of both groups were treated with 400 mg/kg/day of ...