Nanocomposites of anisaldehyde and salicylaldehyde carboxymethyl chitosan (CMC)-Schiff bases/silver nanoparticles have been prepared and characterized. Their antibacterial activities were evaluated against (Bacillus Subtilis, Staphylococcus aureus and Streptococcus faecalis) as Gram + ve bacteria and the Gram − ve bacteria (Escherichia coli, Neisseria gonorrhoeae and Pseudomonas aeruginosa). The prepared compounds were characterized using FTIR spectroscopy, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis. Determination of water uptake of both CMC-Schiff bases/silver nanoparticles was carried out. Minimum inhibitory concentrations (MIC) of the prepared nanocomposites were determined as well. Cytotoxic activity of the investigated nanocomposites were evaluated against liver carcinoma cell; HEPG2 and breast cell line; MCF7.

Poly(vinyl chloride)-pyrazolone; PVC-pz as a new modified form of PVC with high antibacterial and antifungal activities towards some Gram +ve bacteria S. Aureus, B. Subtilis and S. Faecalis) and Gram –ve bacteria (E. Coli, P. Aeruginosa and N. Gonorrhoeae) beside Candida albicans in addition to Aspragillus flavus as fungi has been synthesized in absence and in presence of silver-nanoparticles, AgNPs, in 3 and 5% by weight with respect to PVC. This was developed by a chemical reaction of PVC 1, and pyrazolone 2 in tetrahydrofuran, THF as solvent. PVC-pz derivative has been characterized by FTIR, ¹HNMR spectroscopic analyses, in addition to scanning and transmission electronic microscopy. Photostability of PVC-pz was evaluated by following the discoloration for UV- irradiated samples colorimetrically in accordance with degradation time. IR and ¹H-NMR analyses confirm that PVC-pz, 4 was formed indicating a substitution reaction of chlorine atoms of PVC chains to the hydrogen atom of active methylene and that attached to pyrazolone nitrogen at the same time. Antimicrobial activities of PVC-pz increased in the presence of AgNPs and with increasing its percentage.