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Schiff base, hydrazone, and oxime derivatives of curcumin showed enhanced biological activities.

A simple approach was utilized to synthesize graphene/chitosan-based hydrogel using glutaraldehyde as crosslinking agent in room temperature. The composite aerogel was used for removal of cationic and anionic dyes from aqueous solution. It showed high adsorption capacity towards Congo red as an anionic dye. Adsorption experiments were performed based on various parameters, such as initial Congo red concentration, solution pH and contact time. The kinetics data were analyzed using four different models and the pseudo-second-order model best described the adsorption of Congo red aerogel. The Equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm. The maximum dye adsorption capacity calculated from the Langmuir isotherm equation was 384.62 mg g À1. Moreover, the aerogel was stable and easily recovered, and adsorption capacity was about 100% of the initial saturation adsorption capacity after being used three times.

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Modification of carbon nanomaterials by hyperbranched polyglycerol improves their properties.

The reaction of 2-hydroxy-5-(pyridine-4-yldiazenyl)benzaldehyde with n-alkyl bromides generated five novel azo pyridinium salts in good to excellent yields. The 1 H and 13 C NMR and UV-Vis absorption spectra indicated several tautomers for the new compounds. The NMR, UV-Vis absorption spectra and quantum chemical calculations show that the azo pyridinium salts have a new resonant structure compared to the corresponding azo precursor. Antibacterial activity was studied by disc diffusion and MIC methods. Diphenylpicrylhydrazyl (DPPH) assay was used to determine the antioxidant properties. The effects of carbon chain length on antimicrobial activity were also investigated. The results showed that existence of alkyl groups is crucial for the antibacterial properties. The new compound with decyl group displayed the best antibacterial activity. prepared and purified according to the method reported in the literature. 19 Melting points were measured on an Electrothermal 9200 apparatus. Mass spectra were recorded on an Agilent MS Model 5973. FT-IR spectra were recorded on a Shimadzu 8400S spectrometer using KBr disc. The electronic absorption spectra were recorded with a Shimadzu 1650 spectrophotometer. 1 H and 13 C NMR spectra were recorded in DMSO-d 6 as the solvent on the Bruker DRX-300 MHz and 400 MHz Advance spectrometers.