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INDONESIA
Science and Technology Indonesia
Published by Universitas Sriwijaya
ISSN : 25804405     EISSN : 25804391     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics
An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016
Arjuna Subject : -
Articles 551 Documents
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The Utilization of Chitosan from Maggot (Hermetia illucens) Exuvia as Edible Coating for Tomatoes (Lycopersicon esculentum) and Edible Film with the Addition of Honey as an Antibacterial Agent Daniel; Sitorus, Saibun; Pasaribu, Subur P.; Marliana, Eva; Hairani, Rita; Ruga, Ritbey; Purba, Ritson; Saleh, Chairul; Pratiwi, Djihan Ryn; Magdaleni, Agustina Rahayu; Masmur, Indra; Masmur, Hestina
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1232-1241

Abstract

The use of chitosan from maggot (Hermetia illucens) exuvia as an edible coating for tomatoes (Lycopersicon esculentum) and an edible film with honey added as an antibacterial agent was investigated. This study aimed to determine the yield of chitosan from black soldier fly (BSF, Hermetia illucens) maggot exuviae as an edible coating. The chitosan was produced from chitin by deacetylation, and its effect on the weight loss and vitamin C levels of tomatoes for 7 days after treatment was investigated. The chitosan coating was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy. The antibacterial activity was evaluated using a disk diffusion method. The result showed that by deacetylation, conversion of chitin produced chitosan with a yield of 72% and a deacetylation degree of 75.05%. The chitosan coating significantly affected the weight loss of tomatoes, with the best concentration being 2%. However, the treatment did not significantly affect the decrease in vitamin C levels. The edible chitosan film from BSF maggot exuviae with added honey had a thickness, water content, and water vapor transmission rate of 0.156 mm, 16.9913%, and 30.45 g/m2/24 hours, respectively. SEM characterization showed a relatively dense surface structure, which was slightly smooth and porous. Regarding antibacterial activity, the edible chitosan film inhibited Staphylococcus aureus with an inhibition zone of 10.37 mm; however, Escherichia coli was not inhibited. These results suggest that chitosan from BSF maggot exuviae has potential as an effective edible coating for reducing weight loss in tomatoes despite showing limited antibacterial properties.
Synthesis, Characterization, Anticancer, and Molecular Docking Investigations of Benzothiazole Metal Complexes Periyasamy, Kavitha; Nainamalai, Vijayakumari
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1120-1129

Abstract

The synthesized 2-aminobenzothiazoles based ligand reacted with various transition metal salts were smoothly converted to square planner complexes. The synthesized transition metal complexes are analyzed by using various characterization techniques. Anticancer activity of Schiff base ligand and synthesized metal complexes are examined against human prostate cancer cell line (DU145) MTTassay at different concentration (1, 2, 4, 8, 16, 32, 64, 128, 256, and 512 ug/mL). The IC50 values of metal complexes and free ligand were 16.21 (SBI-Co), 75.98 (SBI-Ni), 25.53 (SBI-Cu), 81.71 (SBI-Zn), and 29.6 (free ligand) ug/mL respectively. Cohasmorepotent against human prostate cancer cell line (DU145). In contrast, the molecular docking study shows, Cu (II) complex has significant inhibition against human 2W3L protein.
Investigation of Mixed MeOH:EtOH Ratio and Air Supply on MEA Performance in Direct Alcohol Fuel Cell (DAFC) Yulianti, Dwi Hawa; Rohendi, Dedi; Majlan, Edy Herianto; Rachmat, Addy; Sya’baniah, Nyimas Febrika
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1012-1019

Abstract

Methanol (MeOH) and ethanol (EtOH) are commonly used fuels in Direct Alcohol Fuel Cells (DAFC). The advantages of these two fuels are influenced by electrochemical reactions centered around the Membrane Electrode Assembly (MEA). In this study, Pt/C catalyst was used on the cathode and Pt-Ru/C on the anode, with catalyst loadings of 2, 4, 6, 8, and 10 mg/cm2. The anode and cathode were characterized using Cyclic Voltammetry (CV), while the conductivity properties were evaluated through Electrochemical Impedance Spectroscopy (EIS). The Open Circuit Voltage (OCV) of the MEA in a single DAFC cell reached 0.65 V, with the highest value observed at a MeOH:EtOH volume ratio of 70:30 at concentrations of 3 M for MeOH and 2 M for EtOH. In addition to oxidation at the anode, oxygen reduction plays a significant role in the MEA performance on the cathode side. The oxygen supply to the cathode increased the power density by 52.17% at the optimal blower voltage of 5 V.
High Concentration of Barium Sulfate for Scattering Strength Improvement to Achieve Better Color Uniformity of a WLED Dung, Nguyen Van; Le, Anh-Tuan
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1225-1231

Abstract

This simulation study provides a comprehensive investigation into the influence of varying concentrations of barium sulfate (BaSO4) on the optical characteristics of white light-emitting diodes (WLEDs). The research is conducted through MATLAB-based simulations that employ Mie-scattering theory to accurately model light–particle interactions. BaSO4 is chosen as a scattering medium due to its well-documented advantages, including chemical stability, non-toxicity, cost-effectiveness, and exceptionally high reflectivity across the visible spectrum. These properties make it a promising candidate for improving both the efficiency and the optical quality of WLEDs. In this study, BaSO4 particles are introduced into the WLED structure with the goal of enhancing two key performance metrics: color uniformity and luminous output. Through systematic modeling, scattering efficiencies are calculated at a range of BaSO4 concentrations to evaluate how particle density influences light propagation and distribution within the device. The results demonstrate a clear correlation between increasing BaSO4 concentration and improved scattering efficiency, leading to higher lumen output. However, the findings also indicate that performance gains reach an optimum at specific concentration levels, beyond which excessive scattering may reduce efficiency by causing unwanted light losses. Beyond luminous efficiency, the integration of BaSO4 also contributes positively to the color rendering capability of the WLED, minimizing color deviation and producing a more uniform and natural white emission. This highlights BaSO4’s dual role in enhancing both brightness and optical quality. Collectively, the outcomes of this simulation study emphasize the potential of BaSO4 as a functional scattering additive that can significantly improve WLED design. The insights gained offer valuable guidance for the development of next-generation solid-state lighting devices with superior optical performance, energy efficiency, and color stability.
Wear Characteristics of LAM-Processed Hybrid eSiC-GO Coated Ti-Alloy Maleque, Md Abdul; Naping, Rosmia; Sarifuddin, Norshahida; Rahman, Md Mustafizur; Wahidah Zulkifli, Nurin
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1198-1208

Abstract

This study concentrates on the wear characteristics of Ti-alloy coated with environmentally friendly silicon carbide-graphene oxide (eSiC-GO) using the liquid additive manufacturing (LAM) technique. Waste rice husk was utilized to extract eSiC material. The hybrid coating of eSiC-GO on Ti-6Al4V alloy was synthesized via LAM technique. Nine wear test samples were obtained from the Taguchi design of experiments variety of process parameters including current (70 , 80, and 90 A), voltage (20, 25, and 30 V), gas flow rate (15, 20, and 25 L/min), eSiC-GO composition (95-5, 90-10, and 85-15 wt%), and a fixed traverse speed (1 mm/s). An analysis of variance (ANOVA) was performed using design software to ascertain the optimal parameter levels for the LAM technique. Optimal hardness, friction, and wear were achieved in experimental run 8, as evidenced by the experimental results. The findings conclude eSiC-GO coated LAM-processed significantly enhanced friction and wear properties. LAM integrates sustainable materials with additive manufacturing advantages to develop hybrid coatings that augment friction and wear resistance. Consequently, aerospace, automotive, and energy can make tangible and measurable contributions to the United Nations’ Sustainable Development Goals.
Assessing Thermic Degradation for Yttrium–aluminum Precursive Agents Applied to YAG Phosphor Samples Nguyen Thi Phuong Loan; Nguyen Doan Quoc Anh; Phan Thi Minh Man; Hsiao-Yi Lee
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1209-1214

Abstract

Several forms of precursive agents were made via the soggy chemical approach, beginning with yttrium–europium–aluminum nitrate (YEAN) compoundaswell as disparate precipitants, comprising urea, oxalic acid, as well as ammonium carbonate. The precursive agents were heat-treated within nitrogen aerosphere for acquiring Y3Al5O12:Eu3+ featuring garnet formation YAG:Eu. Procedures employed for thermic degradation as well as constitution for precursive agents were validated via thermic assessment as well as FTIR spectroscopic assessment. Relationship among thermic degradation stages, as well as gaseous constitution developed throughout thermic procedure was identified via the merger between thermic assessment as well as FTIR. Ultimately, the disparate constitution for precursive agents signifies the luminescent attributes for matching phosphor samples. Urea as well as ammonium carbonate generate YAG samples featuring garnet formation as well as certain red discharge. Regarding oxalic acid, the precipitant yields an ununiform sample featuring yttrium oxide in the form non-pure stage. Said sample would be a merger between Y2O3:Eu3+,Y4Al2O9:Eu3+, as well as Y3Al5O12:Eu3+, yielding greater discharge intenseness. When used in tandem with YAEN, AlAs was investigated for its particle size’s effect on optical properties, such as scattering coefficient, YAG:Ce concentration, correlated color temperature (CCT), chroma aberration, lumen, and color rendition. It was found out 19 wt.% would be the most optimal particle size when all of these properties are taken into account.
Sustainable Cement Development Using Palm Oil Boiler Ash: Mechanical and Microstructural Evaluation Suraedi, Daral; Sjah, Jessica; Handika, Nuraziz; Jonbi; Ashari, Ahmad
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1188-1197

Abstract

The cement industry significantly contributes to CO2 emissions, releasing approximately 1 ton of CO2 for every ton of cement produced, which accounts for up to 40% of total global industrial emissions. This study aims to mitigate these emissions by utilizing Palm Oil Boiler Ash (POBA) as a clinker substitute, creating POBA Cement with substitution levels ranging from 10% to 30%. The POBA was sourced from the Cikasungka Palm Oil Plantation in Bogor, Indonesia and underwent analysis using X Ray Fluorescence (XRF) andScanningElectron Microscopy (SEM) to assess its chemical properties and microstructure. The findings revealed a decrease in compressive strength with increased POBA substitution levels; however, it maintained a pozzolanic effect that supported the crystallization process, albeit with a longer setting time compared to Ordinary Portland Cement (OPC). Notably, the addition of 1% nano-silica was found to enhance compressive strength more effectively than 3%. This research underscores the potential of POBA as an environmentally friendly clinker substitute for sustainable cement production.
Dynamic Modeling of Energy Data: World Crude Oil and Coal Prices 2017-2023 (A State-Space Model Analysis of Multivariate Time Series) Russel, Edwin; Wamiliana; Usman, Mustofa; Elfaki, Faiz AM; Adnan, Arisman; Lindrianasari
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1301-1311

Abstract

The analysis of global crude oil and coal prices has attracted considerable research interest, as these prices significantly affect both society and industry, making the topic highly relevant for governments and policy makers. This study examines the correlation between global coal and crude oil prices from 2017 to 2023. It analyzes the behavior of these price series using a unit root test and develops an optimal model for conducting a Granger-causality analysis. To forecast crude oil and coal prices for the next 30 periods, a state-space modeling approach is applied. The unit root test results reveal that these prices are non-stationary, suggesting that any shocks to prices will have persistent effects. The best-fitting model for the association between coal and crude oil prices is a vector autoregressive model of order two (VAR(2)). The Granger-causality results reveal that current crude oil prices are influenced by both their own past values and previous coal prices, and vice versa. Forecasts using the state-space model suggest a modest upward trend for crude oil prices over the next 30 periods, while coal prices are projected to rise more strongly.
A Multidimensional Assessment of Spouted-bed Roasted Almonds for Mitigating Acrylamide Formation While Enhancing Sensory and Functional Attributes Puspantari, Widya; Yohanes, Heryoki; Astin, Eko Pratama; Hartono, Lusiana Kresnawati; Alfa, Mohamad Nafila; Komariyah, Kokom; Atmaji, Gigih; Pramono, Edi Priyo; Widodo, Wahju Eko; Setianto, Wahyu Bahari
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1109-1119

Abstract

Almonds (Prunus dulcis) are widely valued for their nutritional composition and sensory properties, and roasting is commonly applied to enhance their flavor and extend their shelf life. However, thermal processing can degrade bioactive compounds and promote acrylamide formation. This study examined the effects of spouted-bed fluidization roasting at temperatures ranging from 150 to 180 °C for 5 to 7 min on acrylamide levels, antioxidant activity, physicochemical characteristics, and sensory profiles of almonds. The analytical methods included texture analysis, ultra-performance liquid chromatography (UPLC), colorimetry, Fourier-transform infrared spectroscopy (FTIR), and descriptive sensory evaluation. Acrylamide concentrations ranged from undetectable levels (<40 ppb) at 150 °C for 5 min to 1,672 ppb at 180 °C for 7 min. Total phenolic content increased at higher roasting temperatures (170–180 °C), reaching up to 0.90mg GAE/g, while antioxidant activity decreased from 0.51MBHA/g in raw almonds to 0.15–0.37MBHA/g in roasted samples. Roasting also reduced the moisture content (from 5.38% to 1.09%) and fracturability (from 102.39N to 71.81N), increased the browning intensity (BI: 42.13 to 30.77), and altered the FTIR spectra, indicating the formation of esters and carboxylic acids via Maillard reactions. Sensory evaluation showed that higher temperatures enhanced crispiness and aroma, but also increased bitterness and burnt characteristics. Overall, spouted-bed roasting at 160–170°C for 5–7 min minimized acrylamide formation while maintaining favorable sensory quality and preserving phenolic compounds. These results provide a basis for optimizing almond roasting parameters to improve safety and nutritional retention.
Significant Reduction in Lattice Thermal Conductivity of (PbTe)0.95 - (PbS)0.05 Thermoelectric Materials Through Liquid Silicon Quenching Ginting, Dianta; Nurlela, Ai; Nanto, Dwi; Mashadi; Sudiro, Toto; Kristiantoro, Tony; Rhye, Jong-Soo
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1087-1095

Abstract

Thermoelectric materials are game-changers, that have the ability to transform waste heat into electrical energy, making them a potential renewable energy solution to reduce reliance on fossil fuels. The standard metric for evaluating thermoelectric materials is the dimensionless figure of merit, ZT, which is markedly influenced by lattice thermal conductivity (ĸl ). Higher thermal transport through the lattice lowers the ZT value, reducing the material’s efficiency. Therefore, finding ways to decrease ????l is critical for boosting thermoelectric performance. In our research, we explored an innovative approach by applying a quenching technique using liquid silicon to reduce thermal conductivity (ĸT ) due to lattice vibrations. We compared the lattice conductivity (ĸl ) of materials with and without this liquid silicon quenching process. The results were striking: at 300 K, quenching lowers the lattice thermal conductivity by about 40.1 %, and at 800 K, it is still reduced by roughly 24.7%compared with pristine PbTe. Even more impressive, when compared to non-quenched (PbTe)0.95 − (PbS)0.05 alloys, at 300 K, the silicon-quenched sample attains an additional ĸl reduction of roughly 16.1 %, while at 800 K the extra decrease is about 13.0%. These findings highlight that liquid silicon quenching is a highly effective method for lowering ĸl of PbTe thermoelectric materials. This approach paves the way for developing next-generation thermoelectric materials that are more efficient, particularly for eco-friendly waste heat recovery applications. Our work opens new possibilities for sustainable energy innovation.

Page 51 of 56 | Total Record : 551

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