cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kab. ogan ilir,
Sumatera selatan
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
 43   44   45   46   47 
Synthesis and Characterization of Composite Materials Based on Bacterial Cellulose and Fly Ash Yuliah, Maya; Sutanto, Teja Dwi; Maryanti, Evi; Angasa, Eka; Gustian, Irfan
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.552-561

Abstract

The synthesis of composite materials based on bacterial cellulose with fly ash (FA) has been carried out based on the mass ratio between bacterial cellulose and fly ash, namely 0.005:4.995; 0.01:4.99; 0.015:4.985, and 0.02:4.98. Bacterial cellulose was obtained from the fermentation of coconut water and fly ash was treated after being obtained from the Steam Power Plant (PLTU) of Bengkulu Electric Power Plant Pulau Baai. The characterization of the composite material that had been formed was analyzed using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Raman Spectroscopy, and Scanning Electron Microscope (SEM), the results can be validated that the bacterial cellulose composite has been formed with fly ash. The FTIR results also support the XRD results that have been obtained, Raman spectroscopy shows a Raman shift at 1352 cm-1 as an indication of the bending of C-C-H, CH2, and C-OH the highest conductivity was obtained in the variation of 0.02:4.98 which is 2.45×10-3 S/cm. The methanol permeability test obtained was higher along with the addition of fly ash to bacterial cellulose occurred in the composite material variation of 0.02:4.98, which is 3.66×10-9 mol/cm.s. The highest water absorption occurred in the composite material variation of 0.01:4.98 reaching 718% and the results of SEM micrographs with a magnification of 10000× produced a morphology in the form of fibers with fly ash components interwoven by bacterial cellulose fibers.
A Small Amount of Sn Addition Effect to Cu-15Zn Alloy on Structure, Microstructure, Hardness, Corrosion Resistance, and Antibacterial Activity Basori, Imam; Sari, Yunita; Prasetya, Dendy Wardhana; Susetyo, Ferry Budhi; Alias, Juliawati; Budi, Setia; Yudanto, Sigit Dwi; Hasbi, Muhammad Yunan; Situmorang, Evi Ulina Margareta; Edbert, Daniel
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.443-451

Abstract

Cu-15Zn alloy is widely used as a heat exchanger pipe. CuZn alloy was also used for cardiovascular implant applications. Several problems have been found in that alloy, such as less corrosion resistance. Therefore, various Sn (0.2, 0.7, 1, and 2 wt.%) were added to Cu-15Zn alloy in the present research to enhance corrosion resistance. Afterwards, the alloy was homogenized at 800 °C for 2 hours. Several investigations were conducted, such as structure, microstructure, hardness, corrosion resistance, and bacterial activity, using XRD, Optical microscope, Vickers hardness, Potentiostat equipment, and Digital camera. More Sn content leads to an increase in volume and a decrease in hardness. Presenting Sn in the alloy does not influence the phase in the alloy microstructure. The highest Sn content in the alloy promoted a more positive value of the alloy, indicating that the sample is more cathodic, probably due to the protective layer on the surface. A concentration of 1 wt.% Sn exhibits the most effective antibacterial effect probably due to the small crystallite size.
Effect of Edible Coating Material Composition Based on Chitosan-Gelatin-CaCl2 and Cinnamon (Cinnamomum verum) Essential Oil on the Protection of Cocoa Beans (Theobroma cacao L.) During Storage Putri, Aufy Nuraini; Soesantyo, Adi Kurnia; Iftitah, Elvina Dhiaul
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.528-537

Abstract

Chocolate, a highly demanded commodity, is derived from cocoa beans which undergo fermentation and drying to achieve a safe moisture content of up to 7.5% for storage. Storage conditions significantly impact cocoa bean quality. While edible coatings are commonly used to preserve food quality during storage, their application to cocoa beans using composite polymers and essential oils remains underexplored. This study aimed to evaluate the effectiveness of composite edible coatings, specifically chitosan-gelatinCaCl2 with cinnamon essential oil, in preserving cocoa bean quality over a 28-day storage period. Six variations of coating solutions were applied to peeled cocoa beans: K1= chitosan:gelatin 1:2 + CaCl2 1%, K2= chitosan:gelatin 1:2 + CaCl2 1% + 0.1% essential oil, K3=chitosan:gelatin 1:2 + CaCl2 1% + 0.3% essential oil, K4= chitosan:gelatin 2:1 + CaCl2 1%, K5= chitosan:gelatin 2:1 + CaCl2 1% + 0.1% essential oil, and K6= chitosan:gelatin 2:1 + CaCl2 1% + 0.3% essential oil, and K0 serving as a control without treatment. Quality parameters such as water content, fat content, and pH were analysed using ANOVA (α = 0.05). The results indicated that edible coatings significantly protected against changes in fat content but did not significantly affect water content or pH. The most effective treatment was K6, composed of chitosan:gelatin with the ratio of 2:1 + 1% CaCl2 + 0.3% cinnamon essential oil, providing optimal protection during storage.
Edible Coating of Cherry Tomatoes (Solanum lycopersicum) Based on Chitosan Nanoparticles (NPCh) and Mint (Mentha piperita) Essentials Oil with Addition of Aloe Vera Gel Iftitah, Elvina Dhiaul; Putri, Aufy Nuraini; Soesantyo, Adi Kurnia
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.336-349

Abstract

Cherry tomatoes, as climacteric fruits, continue ripening after harvest, making them susceptible to Xanthomonas campestris bacteria. One method that has been developed to prevent this from happening is applying edible coating with polysaccharides such as chitosan. However, the particles tend to be large and antibacterial activity is not optimal. Therefore, an edible coating was developed using nanochitosan (NPCh) and mint essential oil (EO), enhanced with aloe vera. NPCh was synthesized via ionic gelation with chitosan: STPP ratios of 2:1, 3:1, and 5:1, and mint EO added at 0.2, 0.4, and 0.6 mL. Coatings were applied by dipping, and quality was assessed over 11 days using weight loss, color, Lycopene, Vitamin C parameters, and data result was analyzed with ANOVA (Sig. 0.05). Texture organoleptic tests were evaluated by 10 panelist. Antibacterial activity against Xanthomonas campestris was analyzed in silico. Results showed the smallest NPCh particle size (197 nm) with a 5:1 ratio, and TEM confirmed spherical shapes. Tomatoes without coating (K-) had significantly lower quality compared to coated samples (K+, K1-K6). Samples with EO (K3-K5) preserved physical (weight, color) and nutritional quality (Vitamin C, Lycopene) better, with K5 (0.6 mL EO) showing optimal results. However, there are no significant differences were observed between K5 and K6 (adding aloe vera gel) in maintaining tomato quality. Texture analysis also identified K5 as the most preferred. In silico studies demonstrated strong antibacterial potential for mint EO and aloe vera compounds, with binding affinities (-3.97 to -5.76 kcal/mol) surpassing native ligand and positive control.
Model of Improved Set Covering Location Problem in Determining The LRT Musi Emas Feeder Stops: Route LRT DJKA Station - Plaju Terminal Octarina, Sisca; Puspita, Fitri Maya; Yuliza, Evi; Indrawati; Tasiah, Mawar
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.320-335

Abstract

This study aims to determine the optimal location of the LRT Musi Emas Feeder stops Corridor 5 in conjunction with the LRT DJKA Station-Plaju Terminal route. Light Rail Transit (LRT) is a rapid transit system that employs an integrated rail crossing model. At present, the LRT remains a primary mode of daily transportation for the residents of Palembang. One of the initiatives undertaken by the government to facilitate the utilization of LRT transportation is the provision of passenger transportation (feeder services). The positioning of the feeder stops remains suboptimal and needs more integration with existing public facilities. The distance between the stop locations is highly variable, with some nearby and others at considerable distances. This issue is addressed through the formulation of the Set Covering Problem (SCP) model, which encompasses the Set Covering Location Problem (SCLP) and Maximal Covering Location Problem (MCLP) models, as well as the development of the Improved SCLP model. The SCP model yields four optimal stop locations, which are significantly distant from the actual conditions at the site. In contrast, the Improved SCLP model identifies 48 optimal feeder stops mapped using Geographic Information System (GIS) software. This map of feeder stops could inform the Palembang City Transportation Agency’s efforts to develop an integrated transportation management system.
Cholesterol-Lowering Effects of Turmeric Effervescent Dosage in Preventing Atherosclerosis Pomalango, Zulkifli B.; Paneo, Mohamad Aprianto; Pakaya, Nasrun; Aman, La Ode; Hutuba, Ariani H.
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.482-492

Abstract

This study aims to evaluate the cholesterol-lowering effects of turmeric (Curcuma domestica) in an effervescent powder drink formulation to prevent atherosclerosis. The effervescent preparation was produced using standard effervescent techniques, with organoleptic tests revealing an orange color, the characteristic aroma of turmeric, and a slightly sweet taste. The formulation’s pH was approximately 5.9, with a flowability test result of 14 seconds, a powder angle of repose of 30°, and a dissolution time of  4 minutes and 20 seconds. Curcumin shows potential as an anticholesterol as a preventive measure of atherosclerosis disease  through molecular docking testing using autodock-vina. Qualitative test on turmeric effervescent with Sprektrofotometer UV-VIS, Scanning Electon Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). Cholesterol testing was conducted on mice induced with cholesterol using margarine over a one-week period, resulting in increased cholesterol levels of maximum 290 mg/dL. Following administration of the converted turmeric dosage, cholesterol levels significantly maximum decreased in the first week to  165 mg/dL. By the second week, further reductions were observed, with cholesterol levels maximum dropping to 143 mg/dL. These results suggest that turmeric effervescent formulation exhibits promising cholesterol-lowering properties and may contribute to the prevention of atherosclerosis
Economical and Mathematical Impact on Planning Balanced and Nutritious Diet for Paralympic (Autistic) Athlete (100M Sprinter) Using Linear and Integer Programming Approach Mohd Zailani, Natasha Amira; Howe, Lee Kah; Sufahani, Suliadi Firdaus
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.588-597

Abstract

Every athlete should maintain a balanced diet to ensure proper physical preparation before participating in any competition, as well as for recovery afterward. Dietary planning is essential for ensuring adequate nutrient intake and avoiding food allergens, which can help improve the condition of individuals with autistic (100M sprinter) athletes while also strengthening the immune system. Human dietary planning involves the use of strategies to select suitable food items that are healthy for the body and then integrate them into meals This paper seeks to use Linear programming and Integer programming to develop diet plans for autistic 100M sprinters aged 20-30years. Linear and Integer Programming are the two scientific approaches that can be useful in reducing the costs and considering some additional constraints such as the necessary amounts of certain nutrients, as well as the allergenic products that must not beused.
Ferulic Acid-Nicotinamide Cocrystal: Synthesis, Experimental, and Computation Study Pujiono, Fery Eko; Ekowati, Juni; Amrillah, Tahta; Setyawan, Dwi
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.402-410

Abstract

Ferulic acid-nicotinamide cocrystals have been successfully synthesized using the solvent evaporation method. In this case, nicotinamide which acts as a coformer is mixed with ferulic acid with a 1:1 molar ratio via dissolving process in ethanol. The obtained cocrystals were characterized through Differential Scanning Calorimetric (DSC), Powder X-Ray Diffraction (PXRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and computational analyses. The DSC characterization revealed distinct endothermic peaks at 99.5°C and 128.5°C with a W-shaped profile. This result is different from the thermal behavior of pure ferulic acid which indicates that the ferulic acid-nicotinamide cocrystal is successfully formed. This result is also supported by the PXRD result which reveals distinct peaks at 5.24°, 16.31°, and 34.69° belong to crystal deformation of ferulic acid cocrystal due to the coexistence of nicotinamide coformer. The FTIR data also further indicate the formation of cocrystals marked by the disappearance of the NH(v) functional group at 3400 cm−1 and the emergence of a fuse-like peak at around 1600 cm−1 corresponding to the C-O(v) and NH() functional groups. SEM analysis also demonstrated morphological differences between the obtained cocrystal with pure ferulic acid crystals. The pure ferulic acid crystals exhibit a rectangular shape, whereas the cocrystals display a sword-like morphology. The phenomenon of cocrystal formation was also studied using computational studies through Density Functional Theory (DFT) and Quantum Theory of Atoms in Molecules (QTAIM) which confirmed that the cocrystals were stabilized through intermolecular hydrogen bonding.
Clitoria ternatea Flower Extract Mediated Synthesis of Ni-Doped Hydroxyapatite as Photocatalyst, Antibacterial, and Drug Delivery Agent for Anticancer Drug Fatimah, Is; Nurlaela, Nunung; Fauziyyah, Anas Zahra; Sagadevan, Suresh; Hidayat, Habibi; Haneef, Mehru Nisha Muhamad; Daud, Muhammad Fauzi; Kamari, Azlan; Oh, Won-Chun
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.360-373

Abstract

In the present study, green synthesis of nickel-doped hydroxyapatite using Clitoria ternatea flower extract, and activity testing as photocatalyst, antibacterial agent and drug delivery agent were performed. Synthesis was conducted by hydrothermal treatment of co-precipitated precursors previously mediated with the extract. As drug delivery agent, immobilization of 5-fluorouracil (5FU) onto the prepared sample was performed by spray-drying method. Physicochemical characterization techniques of X-ray diffraction, UV-Visible Diffuse Reflectance Spectrophotometry, transmission electron microscopy, Raman and Fourier-Transform Infra-red spectroscopy were performed to determine the structural and surface properties of material. Photocatalytic activity evaluation for tetracycline removal showed that material has capability to reduce concentration by photocatalytic degradation and photocatalytic oxidation. The degradation efficiency of material was 83.78%. The prepared material exhibited a significant activity against Staphylococcus aureus and Escherichia coli bacteria. The material also expressed the potency as a drug-delivery agent of 5-fluorouracil as shown by the reduced CT26 cell viability of more than 85% during 48 hours.
Effect of Solution Concentration, Fly Ash Ratio, and Aging Time on the Quality of Nano-Silica Setiawati, Mira; Saggaff, Anis; Saloma; Ngian, Shek Poi
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
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.2025.10.2.622-627

Abstract

Fly ash, a byproduct of coal combustion, has gained significant attention due to its high silica content, and this silica-rich waste can be effectively converted into nano-silica. Factors such as the molarity of the solution, liquid-to-solid ratio, and the aging time play an essential role in determining the characteristics of silica nano produced, including particle size, morphology, and purity. This research aimed to determine the optimal conditions of solution molarity and the liquid-to-solid ratio to produce high-purity nano silica, examine the effect of aging time on the morphology and size of silica nanoparticles, and evaluating the effectiveness of the sol-gel method in producing nano-silica. This research uses nitric acid (HNO3 3 M) as the solution because it has not been widely explored and is more effective than other acidic solutions. In addition, the liquid-to-solid ratio varied from 1:5, 1:10, and 1:15, and combined with an aging time of 9 and 12 days, this study became the focus. The sample tested included XRD, XRF, FTIR, and SEM to confirm the nano-silica characteristics. It shows XRD is in the range of 2θ of about 20-22◦, which indicates the presence of amorphous silica, and FTIR shows results that support XRD data. SiO2 composition ranges from 97.47% to 98.57%, a very high amount of pure silica. It may concluded that silica nanoparticles have a particle size that varies from 151.2 nm to 295.4 nm, with a smooth morphology and relatively well distributed.

Page 45 of 56 | Total Record : 551

 43   44   45   46   47 

Filter by Year

2016 2026


Reset
Filter By Issues
All Issue Vol. 11 No. 1 (2026): January Vol. 10 No. 4 (2025): October Vol. 10 No. 3 (2025): July Vol. 10 No. 2 (2025): April Vol. 10 No. 1 (2025): January Vol. 9 No. 4 (2024): October Vol. 9 No. 3 (2024): July Vol. 9 No. 2 (2024): April Vol. 9 No. 1 (2024): January Vol. 8 No. 4 (2023): October Vol. 8 No. 3 (2023): July Vol. 8 No. 2 (2023): April Vol. 8 No. 1 (2023): January Vol. 7 No. 4 (2022): October Vol. 7 No. 3 (2022): July Vol. 7 No. 2 (2022): April Vol. 7 No. 1 (2022): January Vol. 6 No. 2 (2021): April 2021 Vol. 6 No. 4 (2021): October Vol. 6 No. 3 (2021): July Vol. 6 No. 1 (2021): January Vol. 5 No. 4 (2020): October Vol. 5 No. 3 (2020): July Vol. 5 No. 2 (2020): April Vol. 5 No. 1 (2020): January Vol. 4 No. 4 (2019): October Vol 4 No 3 (2019): July Vol 4 No 2 (2019): April Vol. 4 No. 2 (2019): April Vol. 4 No. 1 (2019): January Vol. 3 No. 4 (2018): October Vol. 3 No. 3 (2018): July Vol. 3 No. 2 (2018): April Vol. 3 No. 1 (2018): January Vol. 2 No. 4 (2017): October Vol. 2 No. 3 (2017): July Vol. 2 No. 2 (2017): April Vol. 2 No. 1 (2017): January Vol. 1 No. 1 (2016): October More Issue