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I Wayan Sutapa
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INDONESIA
Chemistry Indonesian Journal of Chemical Research
  • Indonesian Journal of Chemical Research (Indones.
  • Website
Published by Universitas Pattimura
ISSN : 23385359     EISSN : 26142627     DOI : 10.30598//ijcr.2021.-irm
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science
Indo. J. Chem. Res. is a journal that regularly publishes primary articles covering all branches of chemistry and its sub-disciplines. Published articles consist of complete research, short communication, and review articles. The scope of published articles is not limited to inorganic chemistry, physical chemistry, organic chemistry, analytical chemistry, and biochemistry. Editors can invite articles review of authors that includes the latest developments in the field of interest of certain chemicals. A contribution is open to researchers from all countries.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 314 Documents
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In Vitro and In Silico Assessment of Methanol Extract from Moringa oleifera Seeds as α-Amylase Inhibitor Natsir, Hasnah; A Arfah, Rugaiyah; Arif, Abdur Rahman; Nadir, Muhammad; Anita, Anita; Sartika, Sartika; Rahmi, Nur; Karimah, Aulia
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-has

Abstract

Diabetes mellitus (DM) is a metabolic disorder characterized by hyperglycemia, posing a global health threat. Current diabetes treatments often rely on synthetic drugs with side effects, prompting the search for safer natural alternatives. This study investigated the secondary metabolic compounds in methanol extract from M. oleifera seeds and evaluated their antidiabetic activity. The α-amylase enzyme was analyzed to determine optimal incubation time, pH, and temperature. The antidiabetic activity was assessed via α-amylase inhibition using in vitro and in silico methods. Phytochemical screening revealed the presence of flavonoids, alkaloids, and tannins in the extract. Optimal enzyme conditions were 30 minutes of incubation, pH 6.9, and 25 °C. The extract showed the highest activity at 15% concentration with 67.94% inhibition and an IC50 of 15.38%, compared to acarbose with 41.76% inhibition and an IC50 of 17.89%. In silico analysis indicated that 9-octadecanoic acid (Z) methyl ester had a lower inhibition constant and binding energy (2.67 mM and -3.51 kcal/mol) than acarbose (15.72 mM and -2.46 kcal/mol), suggesting a higher enzyme affinity. These findings suggest that M. oleifera seeds contain compounds with potential as antidiabetic agents.
Characterization of HCl-activated Water Hyacinth (Eichhornia crassipes) Adsorbent in Removing Lead Ion (Pb2+) from Battery Industry Effluent Utami, Wasistianna; Sari, Dessy Agustina; Wahyuningtyas, Aulia
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-was

Abstract

This study utilizes the adsorption process to reduce the concentration of lead ions in battery industry wastewater by using adsorbents from water hyacinth (Eichhornia crassipes). This research aims to determine the ability of a bioadsorbent activated by a 0.1 M HCl solution to adsorb Pb2+ through FTIR and AAS characterization. The bioadsorbent was contacted into a standardized solution of Pb2+ with varying contact times (viz., 20, 30, 40, 50, 60, 70, 140, 210, and 280 to determine the maximum adsorption). The highest absorption of the Pb2+ in battery industry wastewater took place for 210 minutes. The absorption ability was 94.45%, with 8.1488 ppm as the initial concentration. Then, this study shows that this characterization before the activation of 0.1 M HCl has O-H, C-H, C=O, and C-O ether functional groups. All three identified the presence of cellulose. Post-activation, lignin, and hemicellulose disappeared due to the vibration of the C=O group. However, an increase in the intensity of the vibrational peak at the C-O group indicates the presence of carbon chain linking in cellulose. Finally, after contact with battery industry effluent, bending vibrations were lost because the H atoms in the functional groups had been substituted with Pb2+.
Bio-oil Quality Based on Coconut Carbon Biomass Using Pyrolisis Method Ratnasari, Rifa; Wardhani, Gladys Ayu Paramita Kusumah; Taufiq, Agus
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-rif

Abstract

Coconut shells are biomass composed of carbon, hydrogen, oxygen, nitrogen, and other components in small quantities. Biomass can be converted into bio-oil via the pyrolysis method. Bio-oil resulting from pyrolysis has poor quality because it contains oxygen, acid compound, ketone, and ester. To improve the quality of Bio-oil, the pyrolysis process is carried out through a catalytic esterification reaction using a sulfonated H2SO4 coconut shell charcoal catalyst. Bio-oil synthesis is carried out at a temperature of 300–500 ℃. Coconut shell acid catalyst preparation was carried out by activation using HCl and followed by sulfonation of H2SO4 at a temperature of 150℃ for 12 hours. The catalyst was characterized using XRD, FTIR, and SEM. The bio-oil obtained was tested for density, kinematic viscosity, water content, pH, ash content, acid value, Bio-oil composition using GCMS, and metal content using ICP-OES. The results of catalyst characterization show that the formed solid carbon-based catalyst from coconut shells has a graphite crystal structure with a densely porous surface and contains sulfonate functional groups. The yield of bio-oil produced was 6.4%.
Preparation and Characterization of Cellulose Acetate from Pandanus tectorius via Microwave Irradiation Rizkiana, Meta Fitri; Amrullah, Abdul Malik Karim; Elisah, Nor; Amini, Helda Wika; Palupi, Bekti; Rahmawati, Istiqomah; Fachri, Boy Arief
Indonesian Journal of Chemical Research Vol 12 No 1 (2024): Edition for May 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-riz

Abstract

This research focuses on extracting cellulose from thorn pandan and evaluating its potential as a raw material for cellulose acetate. Thorn pandan contains polysaccharides, especially cellulose. In its fabrication process, cellulose acetate is produced from cellulose acetylation reaction. Cellulose is extracted using the Microwave-assisted Extraction method with variations in NaOH concentration (1, 2, and 3%), H2O2 concentration (10, 20, and 30%), and time variables (20, 40, and 60 minutes). Extraction optimization was performed with Response Surface Methodology (RSM) model BBD (Box-Behken Design). Several characterizations were carried out to determine the characteristics of cellulose acetate, namely Degree of Acetylation, FT-IR spectroscopy and X-Ray Diffraction (XRD). The highest cellulose yield obtained in the extraction process was 50.7% with a variable of 3% NaOH, 30% H2O2 and 60 minutes. XRD analysis shows the angle value 2θ = 22.53798° of thorn pandan cellulose structure is almost similar to commercial cellulose. FTIR functional group identification of cellulose acetate showed the presence of carbonyl (C=O) and (C-O Acetyl) group, respectively seen at wave numbers 1734 cm-1 and 1256 cm-1. The acetyl content of cellulose acetate from thorn pandan produced is 35.475%. Therefore, thorn pandan biomass has the potential as a raw material for making cellulose acetate.
Analysis of Chemical Components and Antioxidant Activity in Nutmeg Shell Liquid Smoke Processed through Rotary Evaporator Purification Watuseke, Rommy David; Gugule, Sanusi; Lombok, Johny Z
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-rom

Abstract

This study aims to analyze liquid smoke's chemical content and antioxidant activity from pyrolysis of nutmeg (Myristica fragrans) shell with rotary evaporator purification. A rotary evaporator purified liquid smoke from the pyrolysis of nutmeg shells. Identification of the chemical components of liquid smoke from the pyrolysis of nutmeg shells was carried out by Gas Chromatography-Mass Spectroscopy (GC-MS), and Antioxidants were measured using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method with absorbance at a wavelength of λ 517 nm. The results of GC-MS analysis showed 14 peaks and 19 types of compounds detected with the 2-methylphenol compound component located at a retention time of 4.974 minutes, standing out with the largest contribution in terms of area, reaching 47.74%. The antioxidant test showed that the nutmeg shell has IC50 values before and after rotary evaporation of 0.40% and 0.07%, having strong antioxidant activity, and the results at a concentration of 3.2 mg/ml provided a level of free radical protection of more than 50%, namely 91.14%. The main compounds that play as antioxidants are phenol compounds and their derivatives, such as 2-methoxy-phenol and 2-methoxy-4-methyl-phenol.
Synthesis And Characterization Of Silver Nanoparticles Using Gandaria (Bouea macrophylla Griff.) Seed Extract As Bioreductor And Ouw Natural Clay (ONC) As Matrix Kiat, Jaleha; Bijang, Catherina M; Sutapa, Wayan; Sekewael, Serly J
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-jal

Abstract

The synthesis of silver nanoparticles (AgNP) was achieved by utilizing gandaria seed extract as a bioreductant and Ouw natural clay (ONC) as a matrix. An investigation was conducted on the volume of a silver nitrate solution with a concentration of 1 x 10-3 M, which served as a precursor. The silver nanoparticles were analyzed using UV-Vis spectroscopy to assess their surface plasmon resonance (SPR) and stability. The results indicate that the SPR of silver nanoparticles occurs at a wavelength range of 432-450 nm. X-ray diffraction (XRD) was also employed for characterization purposes to ascertain the existence of silver nanoparticles that were generated within the ONC matrix. The XRD characterization data indicate that the Ag/ONC nanocomposite achieved the maximum stability and nanoparticle content when a volume of 500 mL of AgNO3 0.1 M (S5) was added. The mean crystal size of the silver nanoparticles generated is 48.48 nm, with a crystal orientation of both BCC (Body-Centered Cubic) and FCC (Face-Centered Cubic).
The Fabrication of ZnO Nanoparticles-Modified Carbon Paste Electrode for the Analysis of Nicotine Content in E-Cigarette Liquids by Cyclic Voltammetry Fatihah, Vita Ayu; Setiarso, Pirim
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-vit

Abstract

ZnO nanoparticles were used as composites on carbon paste working electrodes to enhance electrode performance in the analysis of nicotine content in e-cigarette liquids by voltammetry cyclic. The optimum composition and condition (pH and scan rate) were determined to identify the conditions that gave the best response. ZnO nanoparticles were synthesized using the sol-gel method and characterized by FTIR, XRD, and SEM. The determination of optimum composition and conditions was studied using cyclic voltammetry. The determination of nicotine content in e-cigarette liquids was analyzed by cyclic voltammetry. The electrode composition that gave the best response was 3:5:2 (carbon: nanoparticles ZnO: paraffin). The optimum conditions for nicotine determination by cyclic voltammetry were at pH 8 and a scan rate of 90 mVs-1. The cyclic voltammetry’s limit detection (LoD) using a ZnO nanoparticles-modified carbon paste electrode is 0.00678 mg/mL, and the percent recovery is 100.35%.
Fabrication of Carbon Paste Electrode Modified with ZnO Nanoparticles and Nanobentonite for Analysis of Bisphenol A by Cyclic Voltammetric Febriyana, Andini; Setiarso, Pirim
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-and

Abstract

The Bisphenol A (BPA) is a 2,2-bis(4-hydroxyphenyl) propane compound that is produced on a large scale for industrial applications, particularly in polycarbonate plastics. BPA molecules can migrate from plastics into food if stored at high temperatures and for extended periods. Various methods have been developed for BPA analysis, including cyclic voltammetry. This study focuses on the fabrication and application of a carbon paste electrode (CPE) modified with ZnO nanoparticles and nanobentonite for the analysis of BPA in polycarbonate-based bottled drinking water using cyclic voltammetry. The results showed that the optimal electrode conditions were: electrode composition 3:4:1:2 (carbon: nanobentonite: ZnO nanoparticles: paraffin), and pH 7. The BPA content obtained by cyclic voltammetry for brands A, B, and C was 0.2102; 0.1752; and 0.2210 mM. These results demonstrate that cyclic voltammetry with a ZnO nanoparticle and nanobentonite modified carbon paste electrode can be used for BPA analysis.
Isolation of Na-alginate from Brown Seaweed (Padina sp.) and Synthesis of Na-alginate-chitosan Polyelectrolytecomplex (PEC) Film as Methylene Blue Adsorbent Rahayu, Rahayu; Bandjar, Adriani; Nurlete, Samsul; Sohilait, Mario Rowan; Baunsele, Anselmus Boy
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-rah

Abstract

Na-alginate has been isolated from brown seaweed (Padina sp.) and then used to make na-alginate-chitosan complex polyelectrolyte films as methylene blue adsorbent. Characteristics of na-alginate, chitosan, and PEC films before and after adsorption were carried out using an FT-IR spectrophotometer. Na-alginate-chitosan PEC film was made by mixing a 0.3% (w/v) Na-alginate solution with a 1% (w/v) chitosan solution with a chitosan-alginate volume ratio (1:3). The film formed was tested for its resistance in pH 3-11 for 7 days and showed that the film could survive in acidic or alkaline media. The adsorption study carried out resulted in maximum concentration data occurring at 75 mg/L with a capacity of 30.2768 mg/g.
Chemical Constituent and Antioxidant Activity of Clove (Syzygium aromaticum) Bud and Leaf Essential Oils from Bali Muderawan, I Wayan; Laksmi, Pande Putu Diah Suci; Mudianta, I Wayan; Martiningsih, Ni Wayan
Indonesian Journal of Chemical Research Vol 12 No 3 (2025): Edition for January 2025
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2025.12-mud

Abstract

Bali is one of clove (Syzygium aromaticum) producers in Indonesia. Clove essential oil is mainly produced from the leaves and flowers. Eugenol is the main component in the essential oil of clove. The objective of this research is to determine constituents and antioxidant activity of clove’s bud and leaf essential oils from Bali. The essential oils were isolated from clove’s bud and leaf samples by steam distillation with the yield of 12.90 and 2.63%. The constituents of the clove essential oils were analyzed by using gas chromatography-mass spectrometry (GC-MS). Thirty-six and twenty-nine constituents were identified based on GC-MS from the clove bud and leaf essential oils, respectively. Major classes of compounds are sesquiterpenes, phenyl propanoids, oxygenated sesquiterpenes, and esters. Different compositions in major constituents were found between both essential oils. Clove bud essential oil (CBEO) contained eugenol (65.29 %), trans-caryophyllene (20.06 %), and α-humulene (3.38 %). While, in clove’s leaf essential oil (CLEO), the composition was eugenol (64.47 %), trans-caryophyllene (27.19 %), and α-humulene (3.62 %). The clove essential oil and its main component show strong antioxidant activity. The antioxidant activity of CBEO, CLEO, and eugenol is 22.58, 29.19, and 17.53 μg/mL, respectively.

Page 27 of 32 | Total Record : 314

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