Transition metal(ii) complexes of halogenated derivatives of (E)-4-(2-(pyridin-2-ylmethylene)hydrazinyl)quinazoline: structure, antioxidant activity, DNA-binding DNA photocleavage, interaction with albumin and in silico studies

Six transition metal(ii) complexes with halogenated quinazoline derivatives as ligands were characterized and evaluated for interaction with calf-thymus DNA, photocleavage of plasmid-DNA, affinity for bovine serum albumin, and antioxidant activity.

Anti-proliferative effect of Fe(III) complexed with 1-(2-hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone in HepG2 cells

We previously developed a chelating ligand, 1-(2-hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone (HMB-ASH), which can chelate Fe(III) to form a complex. The HMB-ASH-Fe(III) complex exhibits a dose-dependent anti-proliferative effect in HepG2 cells, whereas the ligand, HMB-ASH, and Fe(III) alone had no considerable effect. The HMB-ASH-Fe(III) complex was composed of Fe(III):HMB-ASH (1:2), as determined by high-performance liquid chromatography with high-resolution mass spectrometry. The IC50 value was approximately 20 μM, which was comparable to those of the anti-cancer drugs oxaliplatin (OXP) and etoposide (ETP) under the same conditions. Similar to OXP and ETP, HMB-ASH-Fe(III) induced apoptosis in HepG2 cells, as revealed by terminal deoxynucleotidyl transferase fluorescein-12-dUTP nick end labeling assay.

Development of a fluorescent chelating ligand for scandium ion having a Schiff base moiety

A fluorescent ligand, 1-(2-hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone (HMB-ASH), was newly designed and synthesized, and its fluorescence characteristics for metal ions were investigated in the pH range 3.0-10.5 (at a difference of 0.5 for each metal). After testing 31 different metal ions, it was found that HMB-ASH was able to emit fluorescence intensely at 512 nm with an excitation wavelength of 353 nm in the presence of Sc(3+), one of the rare earth metals, at pH values around 3.5 and 8.0. The other metal ions hardly showed fluorescence with HMB-ASH. The fluorescence was more intense at pH 8.0, and the detection limit of Sc(3+) in a buffer solution (pH 8.0) was approximately 18.8 nmol L(-1) (0.85 ppb).