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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
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INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 551 Documents
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Pemanfaatan Ekstrak Daun Sirih Hijau (Piper Betle Linn.) sebagai Capping Agent dalam Green Synthesis Spinel Ferit ZnFe2O4 untuk Remediasi Fenol dalam Air dan sebagai Anti Bakteri Rahmayeni, Rahmayeni; Yuliani, Putri; Putri, Yulia Eka; Stiadi, Yeni
Jurnal Riset Kimia Vol. 15 No. 1 (2024): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i1.685

Abstract

The spinel ferrite material ZnFe2O4 was synthesized using a green synthesis approach by the hydrothermal method. In the synthesis, 2M NaOH was used as a mineralizer and betel leaf extract with varying volumes of 1, 3, 5, and 7 mL as a capping agent, then continued with calcination at 500, 600, and 700°C. Several devices, such as XRD, FT-IR, SEM-EDX, DRS-UV-Vis, and VSM, were used to characterize the synthesized ZnFe2O4 material. The pattern of XRD indicated that the ZnFe2O4 material has a cubic structure, where the increase in crystal size was after calcination. The Fourier Transform Infra-Red (FT-IR) spectrum shows the Fe-O interaction at wave numbers 427-417 cm-1, which is located on the octahedral side, while the Zn-O interaction at wave numbers 534-510 cm-1, which is located on the tetrahedral side in spinel ferrite structure. From the DRS UV-Vis spectrum pattern and band gap values, it was found that the material absorbs light in the visible region. Scanning Electron Microscope (SEM) images show that the morphology of the synthesized material is circular. The Vibrating Sample Magnetometer (VSM) hysteresis curve shows that the synthesized ZnFe2O4 has paramagnetic properties. The synthesized ZnFe2O4 material has photocatalytic activity towards phenolic compounds with a degradation percentage reaching 62.2%, and this material is active as an antibacterial with an inhibition area of 14.4 for S. aereus bacteria.
Senyawa Isoflavonoid dari Akar Gitaan (Willughbeia coriacea Wall.) Aprenesya, Jamarlia; Ardiningsih, Puji; Rudiyansyah
Jurnal Riset Kimia Vol. 15 No. 1 (2024): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i1.686

Abstract

Gitaan (Willughbeia coriacea Wall.) is an endemic plant that grows wild in the forests of Kalimantan. Traditionally, parts of this plant have been applied for fork-lore medication in Dayak tribe. However, scarce information both for secondary metabolites and biological activities of this plant has been reported, especially for flavonoids. This research was conducted to determine structure of flavonoid from ethyl acetate fraction of gitaan roots by spectroscopy analysis. The ethyl acetate fraction was purified by several chromatography techiques in order to isolate compound 1. On the basis of NMR analysis including DART-HRMS data and comparison with literature, an isoflavonoid obtained from the ethyl acetate fraction of gitaan roots is formononetin.
Efek Pendoping Nd3+ Pada Senyawa BaBi2-xNdxNb2O9 Terhadap Struktur, Sifat Dielektrik Dan Optik Zulhadjri, Zulhadjri; Hermansyah, Tommy; Septiani, Upita
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.690

Abstract

The Aurivillius compound with formula BaBi2-xNdxNb2O9 (x = 0.05, 0.1, 0.2, and 0.4) has been successfully synthesized using the molten salt method, showing potential as a ferroelectric material. The impact of Nd3+ substitution on the structure, morphology, dielectric, and optical properties has been systematically analyzed. XRD data refinement confirms that BaBi2-xNdxNb2O9 (BBNN) exhibits an orthorhombic structure with an A21am space group. Anisotropic plate-like grains were observed across all samples, decreasing their size as Nd3+ content increases. The ferroelectric transition temperature (Tc) decreases due to structural distortion caused by the reduction of the lone pair 6s2 electron effect of Bi3+ when substituted with Nd3+. Moreover, this structural distortion also contributes to an increase in bandgap energy (Eg). The diffuse ferroelectric phase transition is characterized by a broadened Tc peak induced by Nd3+ substitution due to increased cationic disruption in the bismuth layers. The ferroelectric phase with a lower and broader Tc suggests that the x = 0.4 sample has the potential for electrocaloric applications.
Profile of a Composite Based on Bacterial Cellulose and Polyvinyl Alcohol as a Drug Release Matrix for Tetracycline Hydrochloride Sukmaningrum, Afif Dwi; Yuanita, Emmy; Dharmayani, Ni Komang Tri; Sudirman, Sudirman; Sudewianingsih, Ni Made; Ulfa, Maria
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.692

Abstract

Bacterial cellulose (BC) is a natural polymer with good mechanical properties and hydrophilicity. Polyvinyl alcohol (PVA) is a synthetic polymer widely used in medicine. Both have been researched for their potential in drug release and acceptance. This study aims to determine the role of BC and PVA as drug release matrices for tetracycline hydrochloride (TCH), with additional fillers such as graphite (G) and TiO2. The results showed that the composites with BC matrix had lower mechanical properties than those with PVA matrix, with tensile strength values of 6.4075 and 17.446 MPa, respectively. However, the BC matrix was superior in porosity and swelling ability. The drug release testing of TCH from the composites showed that the appropriate model to describe drug release in BC matrix composites was in zero order, while the PVA matrix was in first order. The antibacterial activity of the composites on both matrices was tested against Staphylococcus aureus. The results indicate that both composites have potential applications in promising biomedical fields.
Pengaruh Compatibilizer Polyvinyl Alcohol-graft-Maleic Anhydride (PVA-g-MAH) terhadap Karakteristik Plastik Degradable Berbasis Pati Sagu dan Pati Biji Nangka Dewi, Rozanna; Zulnazri, Zulnazri; Sylvia, Novi; Riza, Medyan
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.695

Abstract

Degradable plastics may be employed as a substitute for conventional plastics in various commercial applications. Plastics made from starch and PVA-g-MAH are biodegradable. This research uses sago and jackfruit starch, a maleic anhydride compatibilizer, and PVA to make degradable plastics stronger. The research method consists of several stages, making sago starch and jackfruit seed starch, preparing degradable plastic synthesis, and testing the resulting degradable plastic. The test of mechanical characteristics of degradable plastics carried out is the tensile strength test of 4.41 Mpa - 6.02 MPa on sago starch-based degradable plastic with PVA-g-MAH, while the tensile strength of 6.86 - 8.43 MPa on jackfruit seed starch-based degradable plastic with PVA-g-MAH. The test shows that the compound is hydrophilic, meaning it binds to water and is easily degraded by soil. The DSC thermogram shows that the plastic samples degrade when heated, both thermogram peaks occur which indicate physical changes. The swelling value obtained in sago starch degradable plastic with PVA-g-MAH is (28.14-72.17%) while in jackfruit seed starch degradable plastic, the swelling obtained ranges from (25.91-84.72%) showing a good result. Sago starch and jackfruit seed starch degradable plastics degraded in 6-18 days using PVA-g-MAH. Sago starch and jackfruit seed starch-based plastics using PVA-g-MA meet the ASTM 6400 standard for biodegradable plastics. The plastic should be able to biodegrade up to 60% within six months or 90% within one year.
Isolasi Senyawa Metabolit Sekunder Dari Ekstrak Heksana Batang Kelakai (Stenochlaena palustris): Pardede, Antoni; Wardhani, Rr. Ariessanty Alicia Kusuma
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.703

Abstract

Isolation is a method of obtaining pure secondary metabolite compounds from plant extracts, which provide benefits such as health, medicine, cosmetics, and agriculture. This research has been carried out and aims to isolate the secondary metabolite compound from the hexane extract of the kelakai stems (Stenochlaena palustris). Phytochemical screening of that extract resulted in a positive-containing steroid. The isolation method includes the separation of hexane extract with column chromatography using silica gel as the stationary phase and eluted successively with hexane, chloroform, and ethyl acetate (step gradient polarity). The column chromatography of the hexane extract resulted in five fractions (H1–H5). Furthermore, fraction H3 was purified to obtain a white needle crystal. The isolated compound spot is invisible in thin-layer chromatography (KLT) under an ultraviolet lamp at 254 nm and 365 nm wavelengths. The isolated compound structure was elucidated by proton and carbon nuclear magnetic resonance (NMR), and mass spectroscopy (MS), as well as comparisons with literature data. The isolated compound is a group of steroids identified as β-sitosterol with the molecular formula C29H50O.
Aktivitas Antirayap Kulit Batang dan Akar Tumbuhan Kokosan (Lansium domesticum cv Kokossan) Terhadap Rayap Tanah (Coptotermes curvignathus Holmgren) Fahma, Waninul; Alimuddin, Andi Hairil; Rudiyansyah, Rudiyansyah
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.705

Abstract

Kokosan (Lansium domesticum cv Kokossan) is one of the Meliaceae family plants known to produce various compounds with various activities. The Meliaceae family is known to have fruit seeds with a bitter taste that can be utilized as an antifeedant in insects. However, research on the bioactivity and content of secondary metabolites in the roots and bark of kokosan as termiticides against subterranean termites has never been reported. This study aims to determine the content of secondary metabolite compounds and test the anti-termite activity of extracts and fractions of kokosan root and stem bark against Coptotermes curvignathus Holmgren termites. Root and stem bark powder were macerated separately using methanol solvent and then fractionated to obtain n-hexane, dichloromethane, ethyl acetate, and methanol fractions (residue). Each extract and fraction was fed to termites through cellulose paper at a concentration of 5% for 3 days. Based on the results of phytochemical tests on extracts and fractions from the roots and bark of kokosan, it is known to contain alkaloid, flavonoid, terpenoid, and phenolic compound groups. The results of the anti-termite activity test are based on the percentage mortality value obtained by the methanol extract of the most active root with a value of 97.2% and paper weight loss of only 6.92%. In the ethyl acetate fraction of the roots, mortality was 84.4% and paper weight loss was 2.38%, and the n-hexane fraction of the stem bark showed mortality of 87.6% and paper weight loss of 2.20%. The kokosan root obtained has the most active activity against Coptotermes curvignathus Holmgren.
Potensi Aktivitas Antimalaria Residu Hidrodestilasi Kulit Kayu Manis (Cinnamomum Burmanii) Melalui Penghambatan Polimerisasi Heme Dona, Rahma; Almurdani , M; Rivan , M; Ibad, M Zainul; Syafitri, Ikke Juwita; Azizah, Wahyu; Nur, Siti Rahmatun; Lestari, Putri
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.711

Abstract

Cinnamon (Cinnamomum burmanii) is a herbal plant from Indonesia which is widely used in cooking, cosmetics and medicine. Cinnamon bark isolate is thought to contain compounds with the structure of isoquinoline which are known to be used as antimalarials. The aim of this study was to examine the potential antimalarial activity of extracts and fractions of cinnamon bark hydrodistillation residue based on the % inhibition and IC50 value. These results will also be compared with extracts and fractions of cinnamon bark without hydrodistillation as controls. The test method is carried out in vitro by heme polymerization inhibitor. The test results showed that the n-hexane fraction, DCM fraction did not have inhibitory activity, while the ethyl acetate fraction had better potential than other extracts and fractions, where the ethyl acetate fraction after hydrodistillation (residue) had an IC50 value of 71.84 µg/mL, while the ethyl acetate fraction without hydrodistillation (control) had an IC50 value of 120.05 µg/mL. This result is better than hydroxychloroquine as positive control which has an IC50 value of 184.98 µg/mL. These results indicate that the ethyl acetate fraction from the hydrodistillation residue of cinnamon bark can be utilized and has potential as an antimalarial.
Analysis of Total Phenolics, Flavonoids, and Antioxidant Activity of Cashew Leaf Extract (Anacardium occidentale L.) with Varying Ethanol Concentrations: Analisis Total Fenolik, Flavonoid, dan Aktivitas Antioksidan Ekstrak Daun Jambu Mete (Anacardium occidentale L.) dengan Variasi Konsentrasi Etanol Kurniasari, Risma; Suzery, Meiny; Cahyono, Bambang
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.735

Abstract

This study evaluated the effectiveness of various ethanol concentrations (50%, 70%, and 96%) in extracting bioactive compounds from cashew leaves (Anacardium occidentale). Parameters analyzed included total phenolics, total flavonoids, and antioxidant activity using the DPPH and H2O2 methods. The results showed that the 70% ethanol extract produced the highest total phenolic and flavonoid content as well as significant antioxidant activity compared to other ethanol concentrations. This study offers practical insights for pharmaceutical, cosmetic, and nutraceutical industries in selecting the optimal solvents for cashew leaf extraction. Additionally, the analysis showed that the 70% ethanol extract offered an optimal balance between extraction efficiency and antioxidant activity, making it the most efficient solvent for commercial use.
Isolation and Elucidation Structure of the Chemical Component from Ethyl Acetate Subfraction of Kelakai Stems (Stenochlaena palustris) Pardede, Antoni; Wardhani, Raden Roro Ariessanty Alicia Kusuma
Jurnal Riset Kimia Vol. 16 No. 1 (2025): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i1.706

Abstract

Kelakai (Stenochlaena palustris) belongs to the Blechnaceae family and offers numerous health benefits due to its chemical components. The isolation and structure elucidation of the chemical components from the ethyl acetate subfraction of the kelakai stems (Stenochlaena palustris) have been carried out. The isolation process began with the preadsorption of 241 mg of the E5.6 subfraction, which was then subjected to separation and purification using column chromatography. Three solvent combinations were used in the process: (chloroform 100%, chloroform: methanol (9:1), and chloroform: methanol (8:2)). The choice of solvent was based on the stain patterns observed in thin-layer chromatography (TLC). The chemical component was successfully isolated after chromatography, resulting in a white needle crystal weighing 15.2 mg and a single spot on the TLC, which was monitored using ultraviolet light at a wavelength of 254 nm. The structure of the chemical component was elucidated using 1H-NMR and 13C-NMR spectra, and comparison with literature data confirmed that the isolated compound from the ethyl acetate subfraction of the kelakai stems is succinic acid.

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