Malaria remains an endemic disease in tropical regions, urgently needed the search for effective antimalarial agents due to resistance against existing drugs. This study investigated the potential antimalarial activity of pyridine-based chalcone derivatives against P. falciparum 3D7 and FCR3 strains. The chalcones were synthesized through a one-pot method using various pyridine carbaldehyde, resulting in yields ranging from 53.74 to 86.37%, and all products were characterized using FTIR, GC-MS, and NMR spectroscopies. Among the six chalcones tested, chalcone A [1-(2-methoxyphenyl)-3-(pyridin-2-yl)prop-2-en-1-one] displayed the highest antimalarial activity with IC₅₀ values of 0.48 and 0.31 μg/mL against P. falciparum 3D7 and FCR3 strains, respectively, and a resistance index of 0.65. Molecular docking studies highlighted the interaction of the carbonyl group of all chalcones with Asn108 amino acid residue in the PfDHFR-TS active site via hydrogen bonding, demonstrating their potential as the antimalarial agent. Notably, the positioning of methoxy and pyridine substituents significantly influenced the antimalarial activity of the chalcones.

This investigation aimed to synthesize and evaluate the anticancer potential of thiophene-based N-phenyl pyrazoline derivatives containing methoxy groups using both in vitro and in silico assays. The N-phenyl pyrazolines were synthesized by reacting phenylhydrazine with chalcone derivatives. Using the 3-(4,5-dimethyl thiazole-2-yl)- 2,5-diphenyltetrazolium bromide (MTT) assay, we assessed the anticancer activity of the compounds that were synthesized in vitro against four human cancer cell lines (4T1 and T47D for breast cancer, HeLa for cervical cancer, and WiDr for colorectal cancer), as well as a normal cell line (Vero). The in silico evaluation was carried out through molecular docking and absorption, distribution, metabolism, and excretion (ADME) prediction. Among the synthesized pyrazolines, pyrazoline 2 was revealed as the most active anticancer against 4T1, HeLa, and WiDr cancer cell lines, with IC50 values of 9.09, 9.27, and 0.25 μg/ml, respectively. Furthermore, pyrazoline 2 showed high selectivity with selectivity index values of more than 6 toward all tested cancer cell lines. In silico evaluation via molecular docking against epidermal growth factor receptor revealed that pyrazoline 2 had the lowest binding energy with a value of 8.8 kcal/mol, which was consistent with experimental data. The ADME study using the pkCSM webtool indicated that the N-phenyl pyrazoline derivatives had good pharmacokinetic properties. Therefore, the results of this study suggest that thiophene-based N-phenyl pyrazoline derivatives containing methoxy groups, especially pyrazoline 2, could be potential anticancer agents.

The stability of natural dyes to the changes of pH is really necessary when the natural dyes are applied either on fabric or food. This research aimed to increase the stability of brazilein, a compound contained within the secang wood extract, to the changes of pH. The methylation process was done by reacting Dimethyl Carbonate (DMC) with the brazilein on the secang wood extract. DMC acts as a substance that substitute hydroxyl group on brazilein. The methylation reaction of brazilein on secang wood extract was operated on a three-necked round-bottomed flask fitted with mercury-sealed stirrer and reflux condenser under 80°C temperature and 250 rpm stirring speed. There were two variables observed in this research; the DMC amount ratio to the amount of secang wood extract and the time of the methylation process. The research showed that at the 1:10 the DMC amount ratio to the amount of wood extract and 8 hours of the methylation process give the better stability of color of the secang wood extract than the variation of the other variables.

Nonionic surfactant of dialkanolamide derivates was synthesized and characterized from castor oil (Ricinus comunnis). Ricinoleic acid was isolated from castor oil by hydrolysis in alkaline (KOH) condition at 65 °C. Oxidation of ricinoleic acid by dilute potassium permanganate (KMnO₄) in alkaline condition at 75-90 °C gave dicarboxylic acid which was then reacted with ethanolamine at 140-160 °C for 6 hours. The product was recrystallized with isopropanol, and the structure elucidation was performed by FTIR, ¹HNMR spectrometer, and GC-MS with silylation method. Characterization of surfactants was carried out by surface tension measurement (capillary rise method), Critical Micelle Concentration (CMC) based on turbidity method and calculation of Hydrophilic-Lipophilic Balance (HLB) value with Griffin method and Bancroft rule. The result showed that ricinoleic acid in castor oil is 86.19 % and it is oxidation give an azelaic acid and octanedioic acid in 53.25 %. Amidation of a dicarboxylic acid and ethanolamine at 140-160 °C for 6 hours yielded of N¹,N⁹-bis(2-hydroxyethyl)nona diamide in 49.35 %. Surfactant characterization indicates that dialkanolamide derivates can be used as a surfactant due to its ability to reduce the surface tension of ethanol with CMC at 1.2 g/L, HLB value is 5.58 and can be used as emulsifier water in oil (W/O).

Synthesis of 1,4-Dioxaspiro[4.4] and 1,4-Dioxaspiro[4.5] Novel Compounds from Oleic Acid as Potential Biolubricant