The paper describes the synthesis and characterization of polyaniline (PANI)/CrO3 composites. Samples of PANI/CrO3 composites were synthesized by chemical oxidative polymerization of aniline added with various weight % of CrO3 in the presence of ammonium persulphate as an oxidant. The samples were characterized by Fourier Transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM...

The molecular structures, oxidation states, and reactivity of 3 and 6% CrO3/ZrO2 catalysts prepared by incipient wetness impregnation were examined under different conditions. The in situ Raman spectroscopic studies under dehydrated conditions reveal that the 3 and 6% CrO3/ZrO2 catalysts possess equal amounts of monochromate and polychromate species. Consequently, monolayer coverage on this ZrO...

This study was conducted to investigate the modulating effects of green tea polyphenols on genotoxic damage and apoptotic activity induced by hexavalent chromium [Cr (VI)] in CD-1 mice. Animals were divided into the following groups: (i) injected with vehicle; (ii) treated with green tea polyphenols (30 mg/kg) via gavage; (iii) injected with CrO3 (20 mg/kg) intraperitoneally; (iv) treated with ...

Blastogenic and cytotoxic effects of hexavalent chromium were evaluated by direct, 2 and 20 min oxidation of lymphocytes by 10.0 to 0.0005 mM CrO3 at 0 degrees C. Oxidized cells exhibited concentration-dependent cytotoxicity and the inhibition of tritiated thymidine incorporation rates. When lymphocytes were oxidized first by 1.0 mM periodic acid (H5IO6) and thereafter by 1.0 mM CrO3, the viabi...

Cation size effects were examined in the mixed A-site perovskites La0.5 Sm0.5 CrO3 and La0.5 Tb0.5 CrO3 prepared through both hydrothermal and solid-state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation-radius variance in La0.5 Tb0.5 CrO3 results in reg...

Hexavalent chromium trioxide is known to cause diseases like cancer and specific biological effects on the respiratory system. It induces oxidative stress and lead to formation of stable Cr-DNA adducts that contribute to its cytotoxic and genotoxic effects. In the present study, the antigenotoxic effects of Indian spices viz. Syzygium aromaticum (L.) Merr. & Perry and Cinnamomum tamala Nees & E...

Several epidemiological studies have reported the relation between chromium exposure (used in different industrial processes) and cancer risk. Evidence indicates that the hexavalent form is mutagenic and carcinogenic. Chemoprevention has emerged as a good strategy for reducing the risk from exposure to heavy metals. There is evidence that some tetrapyrrols such as protoporphyrin IX (PP-IX), a p...

Hexavalent chromium compounds exhibit higher toxicity than its trivalent compounds since chromium ions in the +6 oxidation state easily cross biological membranes. It has recently been proposed that substances reducing chromium ions from the +6 to the less toxic +3 oxidation state can be beneficial in management of acute chromium poisoning. In vitro studies also demonstrated quercetin-5 '-sulfo...

The post larvae (PL) of Macrobrachium rosenbergii (2.5 cm and 0.15g) were subjected to static renewal type acute toxicity tests against cadmium chloride (CdCl2), chromium trioxide (CrO3) and lead nitrate (Pb(NO3)2). The 96 h LC50 values were calculated to be 58.93 μg/L, 2.08 mg/L and 25.97 mg/L for CdCl2, CrO3 and Pb(NO3)2 respectively. PL were exposed to the 96 h LC50 concentrations of these h...