Fikriya, Sakti Hidayati
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Study of Antioxidant Activity of the Derivatives of Quinoline-4-carboxylic Acids by the Modification of Isatin via Pfitzinger Reaction Fikriya, Sakti Hidayati; Cahyana, Antonius Herry
Makara Journal of Science Vol. 27, No. 2
Publisher : UI Scholars Hub

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Abstract

In this study, a quinoline-4-carboxylic acid derivative was synthesized through Pfitzinger reaction. In this reaction, isatin is modified via its reaction with ketone and refluxed for 24 h to obtain quinoline-4-carboxylic acid. The presence of a carboxylic group was identified by Fourier Transform Infrared (FTIR) spectroscopy and ultraviolet–visible (UV-Vis) spectrophotometry. The results showed that the absorption peaks of C=O and O–H stretching’s were detected in the range of 1724–1708 and 3436–3242 cm−1, respectively. In the UV-vis spectrum, a shift in the absorption peak was observed toward a larger wavelength, which is referred as a bathochromic shift. The formation of quinoline-4-carboxylic acid derivative was also characterized using the mass spectrometry method. The modification of isatin aims to increase antioxidant activity to obtain quinoline-4-carboxylic acid, which has a better inhibition percentage than isatin. Antioxidant tests were conducted using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The antioxidant activity is measured based on the ability of quinoline-4-carboxylic acid derivative to donate hydrogen radicals, which revealed that the product had a relatively better inhibitory effect than isatin. At a concentration of 5 mg/L, isatin did not show antioxidant activity with the DPPH method. By contrast, the inhibition percentages of 2-methylquinoline-4-carboxylic acid and 2-(4-methylphenyl)quinoline-4-carboxylic acid were approximately 30.25% and 40.43%, respectively. Furthermore, the presence of an aromatic ring makes the antioxidant activity.
Screening Virtual Senyawa Turunan Azo-Asetohidrazida sebagai Inhibitor Potensial Alfa-Glukosidase Zulqurnain, Muhammad; Fikriya, Sakti Hidayati; Suharman, Andi; Dienna, Annisha Noor; Wati, First Ambar
Acta Chimica Asiana Vol. 8 No. 2 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i2.263

Abstract

Type 2 diabetes mellitus is a progressive metabolic disorder marked by persistent hyperglycemia resulting from insulin resistance, insufficient insulin secretion, or a combination of both conditions. A potential therapeutic target for treating this illness is the suppression of the alpha-glucosidase enzyme, which is a key regulator of postprandial glucose absorption and carbohydrate metabolism. This work conducted a thorough in silico analysis to evaluate the efficacy of three synthesised azo-acetohydrazide derivatives (designated compounds C, D, and E) as alpha-glucosidase inhibitors. Pharmacokinetic properties and drug-likeness characteristics were evaluated using the SwissADME platform, while molecular docking simulations were conducted with AutoDockTools against the alpha-glucosidase enzyme structure sourced from the Protein Data Bank (PDB ID: 3W37), utilising acarbose as a reference inhibitor. All three compounds adhered to essential drug-likeness criteria, including those established by Lipinski, Veber, and Ghose, and exhibited advantageous physicochemical characteristics, such as appropriate molecular weight, lipophilicity, topological polar surface area, and aqueous solubility. The compounds were anticipated to have significant gastrointestinal absorption and had no ability to penetrate the blood-brain barrier, suggesting a minimal risk of central nervous system damage. Compound E demonstrated the highest binding affinity among the compounds, with a docking score of –7.80 kcal/mol, and formed multiple stabilising interactions within the enzyme's active region, such as hydrogen bonds, hydrophobic contacts, and electrostatic interactions. This study's novelty is the computational discovery of azo-acetohydrazide scaffolds as inadequately investigated chemical entities with potential antidiabetic properties. These findings establish a theoretical basis for continued development and substantiate future endeavours in the synthesis and experimental validation of these molecules. This study validates the efficacy of structure-based drug design in discovering novel alpha glucosidase inhibitors and identifies compound E as a good candidate for further in vitro and in vivo research in type 2 diabetes treatment.