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All Journal EKSAKTA: Journal of Sciences and Data Analysis SMARTek Foristek CHEMISTRY PROGRESS IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Dinamika Pengabdian (JDP) Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Gema Ngabdi ARIKA Molluca Journal of Chemistry Education (MJoCE) BIOEDUPAT: Pattimura Journal of Biology and Learning Jurnal Ilmiah Berkala Sains dan Terapan Kimia Makara Journal of Science Molekul: Jurnal Ilmiah Kimia BAKIRA: Jurnal Pengabdian Kepada Masyarakat Innovation for Community Service Journal Jurnal Abdimas Multidisiplin Jurnal Analis Kesehatan Kendari International Journal of Acta Material
I W. Sutapa
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kendari, Indonesia.
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences Other

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Isolation of Secondary Metabolite Compounds from the Soft Coral Isis sp., Antimicrobial Testing and Molecular Docking Studies Imran; Fajri Fitra Amalia; Sahidin; Agung Wibawa Mahatva Yodha; Nohong; I Wayan Sutapa; Thamrin Azis
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.10830

Abstract

Soft coral Isis sp. is a type of soft coral that contains many chemical compounds with various benefits that have not been widely studied. This study aims to identify and isolate secondary metabolite compounds contained in the ethyl acetate extract fraction of Isis sp. soft coral, determine of antimicrobial activity, and molecular docking study. Compound separation was carried out by maceration followed by fractionation using Liquid Vacuum Chromatography (LVC). The fractions obtained were identified by Liquid Chromatography Tandem-Mass Spectrometry (LC-MS/MS) technique. Four compounds were successfully identified through LC-MS/MS analysis namely Deoxyadenosine (C10H13N5O3), Spinasterol (C29H48O), Pseudoionone (C11H16O) and Isosalsoline (C11H15NO2). Antimicrobial activity test was conducted against Staphylococcus aureus, and Escherichia coli. The results of the antimicrobial activity test showed strong activity against S.aureus bacteria and E. coli bacteria with the same MIC value of 2 µg/mL. Based on molecular docking analysis can be predicted that compounds isolated from soft coral Isis sp., namely pseudoinone compounds have a role as anti-bacterial S. aureus (PDB: 6KVS). This compound also shows a strong ability as an anti- gram positive bacteria than gram negative. Isosalsoline compounds have a role as anti-bacterial E. coli (PDB: 5BNM). This compound also shows a strong ability as an anti-gram negative bacteria rather than gram positive.
Extraction of Tannin Compounds from Samanea saman (Jacq.) Merr Leaves and Their Application as Corrosion Inhibitor in ST 37 Steel S. Kasim; S. Fauziah; R. Ananda; I. W. Sutapa; A. Kamari
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.3

Abstract

Research has been conducted on extracting tannin compounds from Samanea saman (Jacq) Merr leaves and their potential application as corrosion inhibitors for ST 37 steel. The purpose of this study was to evaluate the impact of adding Samanea saman (Jacq) Merr leaf extract on the corrosion rate and inhibition efficiency of ST 37 steel when exposed to 25% acetic acid. The immersion process was carried out with different concentrations: 0%, 5%, 10%, 20%, and 30%, and with immersion time intervals of 2, 4, 6, and 8 days. The concentration and optimum immersion time results were then further tested at temperatures of 20ºC, 30ºC, and 40ºC. The test results indicate that corrosion occurs uniformly on the surface of the steel. The corrosion rate was determined using the weight loss method, and it was observed that the weight reduction of the steel without inhibitor was higher compared to that of the steel treated with Samanea saman (Jacq) Merr leaf extract inhibitor. Based on the study findings, the highest inhibition efficiency was achieved with a concentration of 20% and an immersion time of 6 days, resulting in an efficiency of 87.3464% and a corrosion rate of 1.9143 mpy. Regarding temperature variations, the highest inhibition efficiency was observed at 20ºC, with an efficiency of 66.6908% and a corrosion rate of 2.8435 mpy.
Effect of Activation Time on the Quality of Microwave-Activated Sago Trunk Charcoal Briquettes (Metroxylon Sagu Rottb) L. Lestari; I. N. Sudiana; S. Raharjo; L. O. M. Salam; I. W. Sutapa
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.9

Abstract

Research has been conducted on the effect of activation time on the quality of sago stem charcoal briquettes (Metroxylon Sago Rottb) activated by microwave. This experimental study aimed to determine the impact of activation time on various parameters of sagu stem charcoal briquettes, including density, moisture content, ash content, volatile matter content, fixed carbon content, calorific value, and combustion characteristics such as ignition time and flame rate. The research involved several stages, including raw material collection, carbonization, grinding and sieving, adhesive mixing, printing and bulking, drying, and quality assessment of the briquettes. Sago stem charcoal briquettes were produced using sago as an adhesive at a ratio of 9:1. The charcoal powder was sieved using an 80-mesh sieve. The samples were printed and compacted at a pressure of 100 kg/cm2 and activated using a 150-watt microwave for durations of 5, 6, and 7 minutes. The results demonstrated that the density ranged from 0.3601 to 0.4892 g/cm3, moisture content ranged from 2.103% to 3.369%, ash content ranged from 4.6422% to 6.4706%, volatile matter content ranged from 80.306% to 84.740%, fixed carbon content ranged from 7.222% to 11.1205%, calorific value ranged from 5467.5 cal/g to 5805.5 cal/g. The briquettes activated by microwave, under a pressure of 100 kg/cm2, exhibited the highest quality, with a combustion rate ranging from 0.0137 g/min to 0.0183 g/min, maximum temperature ranging from 519 oC to 538 oC, and a briquette flame duration ranging from 29 minutes to 35 minutes.
Analysis of Water Quality in Sea Waters After The Sea Snot Occurrence in Bima Bay West Nusa Tenggara S. Kasim; N. A. Pratiwi; H. Natsir; S. Liong; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.12

Abstract

The incident that occurred in April 2022 in Bima Bay was a phenomenon that shocked the residents of Bima City and outside the Bima area. Based on previous laboratory tests, the cause is Sea Snot which is accompanied by an explosion in the number and metabolism of algae. The entry of organic and inorganic pollutants into water bodies can cause water quality to experience degradation in biological function. This research aims to analyze water quality in marine waters with the parameters BOD, COD, DO, determine the Nitrate and Phosphate content and characterize total coliform and E. coli bacteria in marine waters. This research uses electrometric, photometric and membrane filtrate methods. pH ranged from 7.85 - 8.22; DO levels 5.97 - 6.15 mg / L, BOD 1.3, and 5 ranged from 5.52 - 9.06 mg / L. COD levels 15.62 - 21.44 mg / L. Nitrate ranges from 0.124 - 0.204 mg/L. Phosphate ranges from 0.27 - 0.41. Total coliform bacteria ranges from 706 - 1,266 colonies/100 mL and E. coli 0.75 - 1.75 colonies/100 mL. The water quality in the sea waters of Bima Bay has mostly met the sea water quality standards for the parameters BOD, DO, total coliform, E. coli , while the COD parameter is not included in the mandatory parameters which are one of the indicators of sea water pollution. The content of Nitrate and Phosphate in the waters of Bima Bay shows that its value has exceeded the sea water quality standards.
Mesoporous Silica (MCM-48) as an Adsorbent for Methylene Blue Dye P. Taba; Nariskawati; A. H. Kasim; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.14

Abstract

Research on the synthesis of mesoporous silica (MCM-48) has been conducted, with the material being utilized as an adsorbent for methylene blue (MB) dyes. The synthesis of MCM-48 was performed via a hydrothermal method, employing Ludox HS40 as the silica source and a mixture of CTAB and Triton X-100 as the templating agents. The surfactants were subsequently removed through washing with HCl-ethanol. Characterization of the synthesized material was achieved using techniques such as X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transform Infra-Red (FTIR) spectroscopy, and the Barrett-Joyner-Halenda (BJH) method. The MCM-48 materials utilized for MB adsorption included MCM-48 without prior washing (MCM-48-TC) and MCM-48 subjected to a single wash with HCl-ethanol (MCM-48-C1). Adsorption experiments for MB were conducted while varying the contact time to identify optimal conditions at neutral pH (6), and the adsorption capacity was assessed by performing adsorption at different concentrations under these optimal conditions. Isothermal adsorption was evaluated using the Langmuir and Freundlich isothermal models. The concentration of Methylene Blue post-adsorption was determined using a UV-Vis spectrophotometer at a wavelength of 660 nm. The results indicated that MCM-48 is an effective adsorbent for MB dye; the optimal adsorption time for MCM-48-TC was found to be 75 minutes, whereas for MCM-48-C1, it was 90 minutes. Adsorption by both MCM-48-TC and MCM-48-C1 conformed to the Freundlich isothermal model, with adsorption capacities of 1.4447 mg/g and 2.3900 mg/g, respectively.
Transesterification Reaction on Biodiesel Production from Bintaro Oil (Cerbera mangas L.) from Moluccas Island I W. Sutapa; A. Bandjar; H. Tehubijuluw; I. S. Ely; A. Kamari; C. Baskar; I N. Sudiana; L. O. Kadidae
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.15

Abstract

Research on the conversion of bintaro seed oil (Cerbera manghas L.) into biodiesel has been conducted utilizing a KOH catalyst. The biodiesel synthesis involved two reaction stages: esterification and transesterification. The esterification process was executed with a 1.25% H2SO4 (1 M) catalyst, utilizing a methanol-to-oil ratio of 1:9, at a temperature range of 60-65°C for a duration of 2 hours. Following the separation of methanol and triglycerides, transesterification proceeded with a methanol ratio of 1:12, which had previously reacted with KOH catalyst at varying weight percentages of 0.2%, 0.3%, 0.5%, 1%, and 1.5%. The transesterification reaction was conducted over a period of 2 hours at a temperature of 60-65°C. The optimal weight percentage of KOH catalyst identified for the transesterification reaction in the synthesis of biodiesel from bintaro seed oil was determined to be 0.3% KOH catalyst. The resultant biodiesel was subsequently characterized using Fourier Transform Infrared Spectroscopy (FT-IR) and Gas Chromatography-Mass Spectrometry (GC-MS). Physical property tests of the biodiesel fuel, conducted in accordance with ASTM methods, yielded a specific density of 0.8878 g/cm³, a kinematic viscosity of 6 mm²/s, a flash point of 132.5°C, and a pour point of 9°C.
The Latest Green Synthesis of Silver Nanoparticles Using Cocoa Fruit Peel Extract (Theobroma cacao L.) as a Bioreductant S. Kasim; W. Riskiyani; A.N. Zahra; I W. Sutapa; A. Kamari; C. Baskar
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.17

Abstract

Cocoa fruit peel contains a variety of phytochemicals, including tannins, flavonoids, alkaloids, terpenoids, and saponins, which are anticipated to act as reducing agents. The green synthesis method employs methanol as a solvent to extract organic compounds from cocoa fruit peel, which serve as bio-reductants. This study aims to synthesize silver nanoparticles utilizing cocoa fruit peel extract as a bio-reductant. It involved the preparation of silver nitrate (AgNO₃) solutions at varying concentrations of 0.5 mM, 1 mM, and 1.5 mM. Characterization of the nanoparticles was conducted using a UV-Vis spectrophotometer and a Particle Size Analyzer (PSA). The study observed the formation of silver nanoparticle colloids after 30 minutes of stirring, as evidenced by a color change in the colloid to brown. UV-Vis spectrophotometer analysis revealed a maximum wavelength of 461 nm with an absorbance value of 2.032. Notably, as the concentration of silver nitrate (AgNO₃) increased, the absorbance value correspondingly increased. The PSA results indicated that the silver nanoparticles had an average size of 96.08 nm.
Unveiling Non-Covalent Molecular Interactions: A Comprehensive Review Integrating DFT and Crystallographic Insights W. O. N. Haryanti; I W. Sutapa; Sahidin; L. Ahmad; L. O. A. N. Ramadhan
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.18

Abstract

Non-covalent interactions (NCIs) are crucial in elucidating molecular recognition, supramolecular architecture, and material properties. This review synthesizes findings from 20 recent studies (2013–2025), with a focus on key interaction types: hydrogen bonding, π–π stacking, Van der Waals forces, and less prevalent modes such as chalcogen bonding and excited-state interactions. Computational methodologies, particularly dispersion-corrected density functional theory (DFT), benchmark datasets (e.g., S22, HB300SPX), and emerging machine learning (ML) corrections, have markedly enhanced the accuracy of NCI modeling. Experimental techniques, including X-ray diffraction and infrared/Raman spectroscopy, continue to substantiate theoretical predictions. Hydrogen bonds are predominant in influencing structural stability and crystal packing, while π–π interactions play a vital role in stabilizing aromatic systems. Van der Waals interactions are particularly significant in layered materials and adsorption phenomena. Recent advancements, such as neural network potentials (NNPs) and non-empirical functionals (e.g., r²SCAN+MBD@HF), provide accurate predictions even in complex environments. This review underscores the interplay between theoretical and experimental approaches and highlights prospective directions in modeling weak interactions across a range of chemical systems.
Optimisation of Asphalt Extraction from Asbuton Using Microwave-Assisted Extraction (MAE) Method Hikmayani; I W. Sutapa; Sahidin; L. O. Ahmad
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.19

Abstract

Buton natural asphalt (Asbuton) is a strategic non petroleum bitumen resource with promising potential in road construction. However, conventional extraction methods such as Soxhlet and reflux suffer from long processing times, high energy demand, and excessive solvent use. This review evaluates Microwave-Assisted Extraction (MAE) as a green and efficient alternative for extracting bitumen from Asbuton. MAE employs rapid dielectric heating, enabling selective bitumen release while minimizing solvent consumption. Key process variables, including solvent polarity, solid-to-solvent ratio, temperature, extraction time, microwave power, and system pressure are critically reviewed. Comparative data show that MAE significantly improves extraction yield and operational efficiency. In addition, Response Surface Methodology (RSM) is discussed as a modeling tool to optimize variable interactions and identify ideal extraction conditions. Visual aids such as flow diagrams and comparative tables are used to clarify performance metrics and technical constraints. The review also outlines major challenges in MAE implementation, including microwave penetration in low-dielectric matrices and the need for scalable reactor designs. Overall, this paper provides a comprehensive perspective on MAE-based extraction for Asbuton, offering insight into its advantages, limitations, and directions for future research and industrial application.
Development of Eco-friendly Antimicrobial Bricks Using Nickel Slag Waste Enriched with TiO2 to Counteract E. coli Contamination L. Agusu; W. O. Nurtia; M. Z. Muzakkar; I W. Sutapa; Y. Ishikawa; Y. Fujii; T. Asano; S. Mitsudo; Y. Tatematsu
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.20

Abstract

This study investigates the use of nickel slag waste, enriched with TiO2, as a sustainable material for producing antimicrobial bricks. The research focuses on evaluating the impact of variations in firing time and the addition of nickel slag on the mechanical properties of the bricks, as well as their antibacterial effectiveness against E. coli bacteria. The bricks were produced using an electric furnace with different composition ratios of clay, nickel slag, and TiO2. Results demonstrate that the optimal compressive strength of the bricks is 21.673 × 10⁵ N/m², achieved with a clay:slag:TiO2 ratio of 90:5:5 at a firing temperature of 1000°C for 12 hours. The water absorption rate for this composition was found to be 16.98%. Antimicrobial tests, using the scatter method, revealed that TiO2-enriched bricks significantly inhibited E. coli growth, with only two colonies present compared to 77 colonies on bricks without TiO2. X-ray diffraction (XRD) analysis confirmed the presence of key oxides such as SiO2, TiO2, and CaCO3. These findings suggest that nickel slag, when combined with TiO2, can be an effective additive in clay-based bricks to inhibit E. coli growth, offering potential for applications in water purification and environmental sustainability. Furthermore, the use of advanced heating techniques such as microwaves or gyrotrons may enhance the bricks’ structural integrity and antimicrobial performance in future applications.
Co-Authors . Mohtar A Netty Siahaya A. A. Jalil A. A. W. Aqdi A. Bandjar A. H. Kasim A. Kamari A. Kamari A. Kamari A. Okto A.N. Zahra Abdul Wahid Wahab Adelin, La Adriani Bandjar Alwahab Alwahab Angga Febrian Astawa, Ida Nyoman Bandjar, A. Bandjar, Adriani Bijang, Catherina Manukpadang C. Baskar C. Baskar Catherina M. Bijang Chaterina Bijang D. Sri Dahlan Desy Kamanasa Dewi, Nyoman Diah Utari Dominggus Male E. C. Mandasar E. K. Huliselan Fajri Fitra Amalia Fensia Analda Souhoka Fransina, Eirene G. Gaspersz, Nelson H. Natsir H. Tehubijuluw H. Tehubijuluw Harniati P Rego Hasanela, Nurani Hasria Hehanussa, Susan Hellna Tehubijuluw Hellna Tehubijuluw Hikmayani I Nyoman Sudiana I. S. Ely Imran Imran Jolantje Latupeirissa Kamanasa, Desy Kapelle, Imanuel B. D. Karna Wijaya Karna Wijaya L. Agusu L. Ahmad L. Harimu L. Lestari L. O. A. N. Ramadhan L. O. Ahmad L. O. Kadidae L. O. M. Salam La Agusu Latupeirissa, Jolantje M. Z. Muzakkar Maahury, Mirella Fonda Mahulau, Nurlina Maryantho Masarrang Matheis F.J.D.P. Tanasale Mealan Lethulur Mirella Fonda Maahury Muhamad Jamal Mutmainnah N. A. Pratiwi N.F. Jaafar Nariskawati Nasution, Annio Indah Lestari Nohong Nohong Nursiah La Nafie P. Taba Pattiasina, Priska Marisa Paulina Taba Polansky Patty Priska Marisa Pattiasina Priska Marissa Pattiasina Pusung, Yulian A. D. R, Irwan R. Ananda R. E. Nugraha R. Subagyo Rahayu Rahayu Ranglalin, Olivia M. Ria Armunanto Ria Armunanto Rosmawaty Harahap Rosmawaty Rosmawaty Ruslin Hadanu S. Fauziah S. Kasim S. Liong S. Mitsudo S. Raharjo Sahidin Sahidin Sahidin Salim Idris Samual, Ismah Sapulete, Sisca Madona Semuel Simra Pada Sherly J. Sekewael Siahay, Victor P.D. Sohilait, Mario Rowan Sriyanti, Gusti Ayu Komang Syahrir T. Asano Thamrin Azis THAMRIN AZIS Topurtawy, Ronald R. W. O. Mulyana W. O. N. Haryanti W. O. Nurtia W. Riskiyani Wiyasa, I Ketut Y. Fujii Y. Ishikawa Y. Tatematsu Yodha, Agung Wibawa Mahatva Yuli Asmi Rahman Yusthinus T. Male Yusthinus Thobias Male Zainal Syam Arifin