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Jurnal Kimia Unand
Published by Universitas Andalas
ISSN : 23033401     EISSN : 30262933     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal Kimia Unand has been registered with the number online ISSN: 3026-2933 and printed ISSN: 2303-3401. Jurnal Kimia Unand is a peer-reviewed journal published by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Sumatera Barat, Indonesia. This journal is devoted to publishing original contributions on chemistry, applied chemistry, chemical engineering, and materials science, both theoretical and experimental studies. Among the research areas of interest are inorganic and organic, especially in developing materials with novel and/or valuable properties. Initially, J. Kim. Unand published articles in 2012, Volume 1. Number 1. November 2012 with a printed ISSN;2303-3401. This journal publishes 4 issues in 1 year and does not yet have an online journal system in the publishing process. This journal aims to publish the articles of undergraduate students of the Chemistry Department, Faculty of Mathematics and Natural Sciences, Andalas University, as one of the graduation requirements. In 2022, J. Kim. Unand initiated using OJS with an online ISSN, and the publishing frequency is two issues per year, in May and October. The criteria of the submitted article cover the following types of articles as follows: Communications. Research articles. Review articles. The scope of this journal includes: Organic synthesis and natural product chemistry Materials synthesis and characterization Synthesis of organic and inorganic compounds Theoretical and computational chemistry Fabrication, development, and validation of analytical methods Food and medicinal chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 46 Documents
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Synthesis of Hydrophobic Coatings on Concrete Surface Using Organosilicone/TiO2 and Organosilicone/Carbon-Based Materials Wellia, Diana Vanda; Yanni, Rahma; Hidayat, Benny
Jurnal Kimia Unand Vol. 14 No. 2 (2025): November 2025
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.14.2.8-14.2025

Abstract

Surface coating methods provide protection for porous concrete surfaces against water diffusion, which can otherwise lead to structural damage and a reduction in concrete's service life. This study aims to assess the impact of varying quantities of biosynthesized TiO2 and coconut shell-derived carbon on concrete surface hydrophobicity and to compare their effectiveness in enhancing it. SEM analysis confirmed that the Organosilicone-based hydrophobic coating with 0,20 g of TiO2 and 0,20 g of carbon was uniformly distributed, covering micropores, and increasing concrete surface roughness. EDS analysis indicated a decrease in the Ca element peak and the absence of elements like Al, Fe, and K, validating the success of the concrete surface coating. FTIR analysis revealed the emergence of new absorption bands, such as 2963 cm-1 (aliphatic C-H bonds of Organosiliconee) and 477 cm-1 (Ti-O bonds), on the hydrophobic concrete surface. Contact angle measurements demonstrated hydrophobic behavior, with the B/Organosiliconee/TiO2 sample exhibiting an angle of up to 122,4º and the B/Organosiliconee/C sample up to 138,3º. Consequently, carbon derived from coconut shell waste emerges as a viable alternative for hydrophobic surface applications due to its superior hydrophobicity properties compared to TiO2.
Analisis Potensi Produksi Enzim Amilase oleh Beberapa Species Bacillus serta Penentuan Aktivitasnya secara Kualitatif dan Kuantitatif Geliz Luh Titisari; Nurul Haviza; Aken Putri Nandi Nanti; Syafrizayanti syafrizayanti; Prima Fitria Hillman
Jurnal Kimia Unand Vol. 15 No. 1 (2026): Mei 2026
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.15.1.1-7.2026

Abstract

This study aimed to analyze the potential of several Bacillus species—Bacillus subtilis, Bacillus thuringiensis, and Bacillus cereus—in producing amylase enzymes and to determine their enzymatic activity both qualitatively and quantitatively. Screening was conducted using starch agar medium, where the formation of clear hydrolysis zones indicated amylase activity. Growth curve analysis was used to determine the optimal harvesting period based on the bacterial growth phase. Enzyme production was carried out in a nutrient medium containing starch, and the crude enzyme extract was tested for activity using the Somogyi–Nelson method. The results showed that all Bacillus species tested exhibited amylolytic activity, with B. subtilis showing the highest amylolytic index (1.97). However, B. cereus demonstrated the greatest enzymatic performance, with an enzyme activity of 0.219 U/mL and a specific activity of 8.193 U/mg protein. These findings indicate that B. cereus possesses strong physiological and genetic potential to produce high levels of extracellular amylase compared to B. subtilis and B. thuringiensis. Therefore, B. cereus can be considered a promising candidate for industrial amylase production, and further optimization of fermentation conditions is suggested to enhance enzyme yield and catalytic efficiency.
Isolasi dan Karakterisasi Senyawa Metabolit Sekunder Fraksi Etil Asetat Daun Sungkai (Peronema canascane Jack.) Suryati; Aulia Liberty; Norman Ferdinal; Emil Salim
Jurnal Kimia Unand Vol. 15 No. 1 (2026): Mei 2026
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.15.1.8-13.2026

Abstract

Peronema canescens Jack, locally known as Sungkai, is a medicinal plant widely found in Indonesia and traditionally used as an antipyretic, anthelmintic, antimalarial, and mouthwash. Due to its diverse pharmacological potential, Sungkai leaves represent a promising subject for research. This study aimed to isolate and characterize secondary metabolites from the ethyl acetate fraction of Sungkai leaves collected from Agam Regency. The isolation process was carried out using column chromatography followed by purification through trituration, yielding 4.2 mg of white solid. Purity analysis by thin- layer chromatography (TLC) showed a single purple spot after spraying with Liebermann–Burchard reagent, with a melting point in the range of 251–253 °C. UV–Vis spectrophotometry exhibited a maximum absorption at 284 nm, indicating the presence of a limited conjugated system. FTIR spectrum confirmed the presence of aliphatic C–H stretching (2919 cm⁻¹), C=C stretching (1635.41 cm⁻¹), geminal dimethyl group (1450.30 cm⁻¹), and C–O stretching (1028.88 cm⁻¹). Based on these results, the isolated compound was identified as a member of the triterpenoid class.
Degradasi Residu Pestisida Klorpirifos pada Buncis Menggunakan Katalis TiO2/Zeolit secara Fotolisis Z. Zilfa; Tio Putra Wendari; Rahmadhani Khairul Baryah
Jurnal Kimia Unand Vol. 15 No. 1 (2026): Mei 2026
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.15.1.14-25.2026

Abstract

Pesticide residues such as chlorpyrifos in agricultural products are toxic to both human health and the environment. Titanium dioxide (TiO2) is a widely used photocatalyst for pollutant removal; however, its efficiency is limited due to its relatively low surface a-rea. To enhance its photocatalytic performance, natural zeolit was employed to improve the effectiveness of TiO2. Zeolit has a high surface area and strong adsorption capacity, and when combined with a photocatalyst, it can improve pollutant degradation efficiency through simultaneous adsorption and photocatalysis. This study aims to degrade chlorpyrifos pesticide residue on green beans using TiO2 supported by zeolit through a photolysis process. The TiO2/zeolit catalyst was synthesized through activation and saturation of zeolit, followed by combination with TiO2. Chlorpyrifos residues on green bean samples were analyzed using a UV-Vis spectrophotometer, while catalyst characterization was conducted using FTIR and XRD. The study also looked at the effects of photolysis time and catalyst dosage on degradation efficiency. The results showed that the degradation percentage of chlorpyrifos under UV light reached 72.88% with TiO2 and 30.17% with zeolit. The TiO2/zeolit composite exhibited a significant improvement in degradation efficiency, reaching 98.82%, indicating an effective synergy between photolysis and adsorption. In the absence of UV irradiation, degradation was only 44.45%, confirming the essential role of UV light in activating TiO2 as a photocatalyst and enhancing the degradation of chlorpyrifos. The degradation of chlorpyrifos using TiO2/zeolit followed first-order kinetics, where the reaction rate is directly proportional to the remaining chlorpyrifos concentration. FTIR analysis of the samples indicated successful degradation through the reduction of characteristic peak intensities. Furthermore, FTIR and XRD characterizations of the catalyst showed that the TiO2/zeolit catalyst maintained its structural stability after the degradation process, allowing for potential reuse. This study shows that TiO2/zeolit is effective for photocatalytic pesticide removal and may be applied in agricultural waste treatment.
Synergistic Inhibition of Mild Steel Corrosion in Hydrochloric Acid by Kecapi (Sandoricum koetjape ) Leaf Extract and Iodide Ions Emriadi; Sari Wahyuni; Suryati
Jurnal Kimia Unand Vol. 15 No. 1 (2026): Mei 2026
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.15.1.26-33.2026

Abstract

The corrosion inhibition performance of steel in hydrochloric acid solution using kecapi (Sandoricum koetjape (Burm.f.) Merr) leaf extract (KLE) and the synergistic effect of iodide ions was investigated using the weight loss method at temperatures ranging from 30 to 60 °C. The inhibition efficiency increased with increasing concentrations of both KLE and iodide ions, as well as with increasing temperature. A maximum inhibition efficiency of 86.61% was achieved at a KLE concentration of 6 g L⁻¹ in the absence of iodide ions, which further increased to 92.63% upon the addition of 0.5 g L⁻¹ iodide ions, indicating a pronounced synergistic effect. The adsorption behavior of KLE on the mild steel surface followed the Langmuir adsorption isotherm, suggesting monolayer adsorption. FTIR analysis revealed shifts in characteristic functional group bands, confirming interactions between extract constituents and the steel surface. SEM observations demonstrated significant improvement in surface morphology for mild steel specimens immersed in 1 N HCl containing KLE and iodide ions compared to the uninhibited solution. The synergistic effect between KLE and iodide ions was quantitatively evaluated using synergism parameters derived from inhibition efficiency values, confirming enhanced adsorption and corrosion protection.
Studi In Silico Interaksi Senyawa Bioaktif Curcuma xanthorrhiza Roxb. terhadap Protein mTOR sebagai Kandidat Terapi Antikanker Felaisya Fani Fatihah; Romy Dwipa Yamesa Away; Arif Juliari Kusnanda
Jurnal Kimia Unand Vol. 15 No. 1 (2026): Mei 2026
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.15.1.34-40.2026

Abstract

The mammalian target of rapamycin (mTOR) is a crucial regulator of cell growth and proliferation, making it a promising target for anticancer drug discovery. This study evaluated the potential of major bioactive compounds from Curcuma xanthorrhiza Roxb. as mTOR inhibitors using an in silico molecular docking approach. Drug-likeness was assessed based on Lipinski's Rule of Five, followed by molecular docking using Molecular Operating Environment (MOE) 2019 against mTOR (PDB ID: 4JT5), PP242 was employed as the native ligand for redocking validation and as the reference compound for molecular docking. The docking protocol was validated by redocking the native ligand, yielding an RMSD value of 1.2 Å, indicating a reliable docking procedure. Four compounds fulfilled Lipinski's Rule of Five, while xanthorrhizol exhibited a single violation related to its LogP value. Curcumin showed the strongest binding affinity with a docking score of −9,3485 kcal/mol, followed by demethoxycurcumin, bisdemethoxycurcumin, xanthorrhizol, and germacrone. Curcuminoids formed hydrogen bond and hydrophobic interactions with key active-site residues. The docking results indicate that curcumin demonstrated a favorable binding profile among the tested compounds, however, further experimental studies are required to confirm its biological activity.

Page 5 of 5 | Total Record : 46

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