Green synthesis of gold nanoparticles using Curcuma pseudomontana isolated curcumin: Its characterization, antimicrobial, antioxidant and anti- inflammatory activities

Green synthesis of gold nanoparticles (AuNPs) has garnered fervent interest due to their implicit biomedical applications. This study reveals the green synthesis of AuNPs and co-functionalization with Curcuma pseudomontana isolated curcumin (CUR). Synthesized curcumin capped nanoparticles (CUR-AuNPs) were stable and evaluated by SEM, HR-TEM, UV–vis and FT-IR spectroscopy and they were spherical in shape, homogenous with an average diameter of 20 nm along with long term stability. The CUR-AuNPs were tested for their antibacterial activity against Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtilis and Escherichia coli and displayed significant antibacterial activity. CUR-AuNPs showed maximum inhibition efficiency of 94% by the human red blood cell method. CUR-AuNPs also exhibited significant antioxidant and radical scavenging activities. This study sets a platform for novel synthetic AuNPs formed by utilizing reducing agents in form of isolated curcumin to effectively exploit the biomedical application of the particles

Solvation model for the oxidation of methionine by imidazolium fluorochromate in aqueous acetic acid medium

The oxidation of methionine by imidazolium fluorochromate (IFC) were studied, in the presence of chloroacetic acid, in water–acetic acid mixtures of varying molar compositions. The reaction is first order with respect to methionine, IFC and acid. The reaction rates were determined at different temperatures and the activation parameters were computed. The reaction rate increases with increasing mole fraction of acetic acid in the mixture and specific solvent–solvent–solute interactions were found to predominate (86 %). Asolvation model and a probable mechanism for the reaction are postulated

Kinetics and mechanism of the oxidation of methionine by quinolinium chlorochromate

The oxidation of methionine by quinolinium chlorochromate (QCC) has been studied, in the presence of chloroacetic acid, and in wateracetic acid mixtures of varying mole fractions. The reaction is first order with respect to methionine, QCC and acid. The reaction rates were determined at three different temperatures (25, 35 and 45 °C) and the activation parameters were computed. The reaction rate increased with increasing mole fraction of acetic acid in the mixture and specific solventsolventsolute interactions were found to predominate (81 %). A solvation model and a suitable mechanism for the reaction are postulated