In this article, a synthesis of N’-(benzylidene)-2-(6-methyl-1H-pyrazolo[3,4-b]quinolin-1-yl)acetohydrazides and their structural interpretation by NMR experiments is described in an attempt to explain the duplication of some peaks in their ¹H- and ¹³C-NMR spectra. Twenty new 6-methyl-1H-pyrazolo[3,4-b]quinoline substituted N-acylhydrazones 6(a–t) were synthesized from 2-chloro-6-methylquinoline-3-carbaldehyde (1) in four steps. 2-Chloro-6-methylquinoline-3-carbaldehyde (1) afforded 6-methyl-1H-pyrazolo[3,4-b]quinoline (2), which upon N-alkylation yielded 2-(6-methyl-1H-pyrazolo[3,4-b]quinolin-1-yl)acetate (3). The hydrazinolysis of 3 followed by the condensation of resulting 2-(6-methyl-1H-pyrazolo[3,4-b]quinolin-1-yl)acetohydrazide (4) with aromatic aldehydes gave N-acylhydrazones 6(a–t). Structures of the synthesized compounds were established by readily available techniques such as FT-IR, NMR and mass spectral studies. The stereochemical behavior of 6(a–t) was studied in dimethyl sulfoxide-d₆ solvent by means of ¹H NMR and ¹³C NMR techniques at room temperature. NMR spectra revealed the presence of N’-(benzylidene)-2-(6-methyl-1H-pyrazolo[3,4-b]quinolin-1-yl)acetohydrazides as a mixture of two conformers, i.e., E_(C=N)(N-N) synperiplanar and E_(C=N)(N-N)antiperiplanar at room temperature in DMSO-d₆. The ratio of both conformers was also calculated and E_{(C=N) (N-N)} syn-periplanar conformer was established to be in higher percentage in equilibrium with the E_{(C=N) (N-N)}anti-periplanar form.

1. The aim of my study was to find the effect of co-administrating orange juice and hesperidin on the bioavailability of metoprolol tartrate in rabbits. 2. Metoprolol tartrate (10mg/kg) was given orally to rabbits with hesperidin (10mg/Kg) and with orange juice (6ml/Kg) separately. 3. The plasma concentrations of metoprolol tartrate was determined using Reverse Phase-High Performance Liquid Chromatography at 1.5, 1, 2, 4 and 6 hours and the pharmacokinetic parameters were studied. 4. In comparison to the control group, the AUC of metoprolol tartrate was increased significantly by 68.32% with hesperidin while orange juice substantially reduced the AUC by 37.08% .However no significant change was observed in T_max K_el and Vd in both groups. The relative bioavailability of metoprolol tartrate with hesperidin was 168.3% as compared to orange juice i-e 62.9%. 5. The present study revealed that the concurrent intake of hesperidin with metoprolol tartrate increased its bioavailability while orange juice administration suppressed its bioavailability. The change in bioavailability of metoprolol tartrate might be due to alterations in the activity of cytochrome P450 enzymes involved in the metabolism of metoprolol tartrate. However, the exact mechanism is still not known. These interactions may be of clinical significance.

This study uses an environmentally friendly approach to explore a new synthetic pathway for Schiff bases and their metal complexes. A new Schiff base ligand (C) was synthesized by reacting 7-aminodeacetoxycephalosporanic acid with benzaldehyde. The resulting Schiff base was then reacted with three transition metal (Zn, Fe, and Mn) nanoparticles facilitated by ethanolic extracts from three different plant leaves (Moringa oleifera, Azadirachta indica, and Trigonella foenum-graecum) to formulate environmentally friendly nanometal complexes (C1 to C9), which were subsequently evaluated for their anti-bacterial and antioxidant activities. These complexes exhibited crystallite sizes in the range of 7.24-64.24 nm. Structural, compositional, and elemental analysis of the Schiff base ligand and its metal complexes was carried out using FTIR, 1H-NMR, 13C-NMR, XRD, and SEM-EDX, which confirmed the integration of metal moieties within non-uniform sheet-like nanostructures. The thermal properties of all synthesized samples were quantified via TGA, which provides a comprehensive understanding of the thermal properties and decomposition mechanisms of Schiff bases and their metal complexes. Assessment of the antibacterial activity of the Schiff bases and their complexes revealed strong action against both gram-positive (Staphylococcus aureus and Stenotrophomonas maltophilia) and gram-negative (Pseudomonas aeruginosa and Xanthomonas campestris) strains. The prepared samples showed antioxidant activity in the following order: C4 > C5 > C6 > C1 > C2 > C3 > C7 > C8 > C9. Most of the samples, particularly the Zn-complex derived from Moringa, exhibit promising potential for pharmaceutical applications.

The present study was carried out to estimate the residual level of preservatives and active whitening agents from personal care products (PCPs) wastewater