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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
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Articles 30 Documents
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Search results for , issue "Vol. 10 No. 2 (2025): April" : 30 Documents clear
Augmenting Chroma Performance for WLED Employing Sr8ZnSc(PO4 )7:Eu2+@SiO2 as a Scattering-Enhancing Substance Cong, Pham Hong; Anh, Nguyen Doan Quoc
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.2025.10.2.467-472

Abstract

Featuring the B-Ca3(PO4)2 phosphor system, Sr8ZnSc(PO4)7:Eu2+ (SZSPOE) phosphor can be used as an alternative to YAG:Ce3+ yellow phosphor for the advancement of the white light-emitting diode (WLED). Its potentials are demonstrated in this paper, including the expected emission power and wavelength based on the previous studies and its impacts on WLED illumination properties employing Mie-theory-based scattering simulation and calculation and MATLAB software. SZSPOE phosphor can display a wide yellow discharge peaking at 511 and 571 nm and a redshift upon the increase in doped Eu2+ dosage. A phosphor layer comprised of SZSPOE phosphor, SiO2 particles, and silicone gel is simulated for making a WLED. The WLED performance is observed with varying SiO2 amount. Changes in simulation results of the WLED’s lighting properties can be attributed to the scattering within the phosphor layer in response to different SiO2 concentrations. Results demonstrate that increasing SiO2 amount can lead to the better spatial color distribution uniformity and luminous output of the WLED. Meanwhile, the lower color rendering index is observed owing to the insufficient red light power. However, the improvement in color uniformity and luminosity alongside the emission tunability of the SZSPO host, SZSPOE phosphor can be a promising candidate for substituting the original YAG:Ce3+ for advanced WLEDs.
Preparation and Characterization of ZnO-Fe2O3 Nanocomposite Using Green Synthesis Method and Its Application in Powder Pyrotechnics Lestariana, Evie; Supriyatno, Heru; Sitompul, Hamonangan Rekso Diputro; Restasari, Afni; Yulizar, Yoki
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.2025.10.2.493-503

Abstract

Nanocomposites are often used as a catalyst in the pyrolysis of Al/Mg/KNO3 rocket igniter charge. Because the synthesis of the nanocomposites has a negative impact on the environment, in this study, the nanocomposite of ZnO-Fe2O3 was synthesized using a green synthesis method based on the aqueous fraction of Syzygium polyanthum (Wight) Walp. leaf extract. The secondary metabolites contained in the extract were tested. ZnO-Fe2O3 nanocomposite was characterized using Ultra-Violet-Visible Diffuse Reflectance Spectroscopy (UV Vis-DRS), Fourier Transform Infra-Red Spectroscopy (FT-IR), X-ray Diffraction (XRD), Particle Size Analyzer (PSA), Scanning Electron Microscope-Energy Dispersive X-Ray Spectroscopy (SEM-EDS), and Transmission Electron Microscope (TEM).The thermal decomposition process of Al/Mg/KNO3 with and without ZnO-Fe2O3 nanocomposite was analyzed using Differential Thermal Analysis (DTA) and Thermogravimetry Analysis (TGA). As a result, ZnO-Fe2O3 nanocomposite is successfully synthesized, proven by UV-Vis DRS, FT-IR, XRD, and SEM-EDS analysis. It highlights the effectiveness of aqueous leaves extract of Syzygium polyanthum (Wight) Walp. as a capping agent because of the secondary metabolites. Based on PSA and TEM characterization, the particle size is 17.37 nm. The TGA curves demonstrate that the addition of ZnO-Fe2O3 nanocomposite lowers the activation energy for decomposition of Al/Mg/KNO3, from 58.71 kJ/mol to 52.07 kJ/mol, as well as reduces the stage in the decomposition process. A particular reason lies on the role of ZnO-Fe2O3 nanocomposite in reducing the activation energy of the thermal decomposition ofKNO3.
Molten Salt Synthesis of SrTi0.95Fe0.05O3: The Effect of Chloride Salt Type Study Pertiwi, Ulvi Dwi; Anwari, Nelly Safitri; Safitri, Widiya Nur; Pramono, Edi; Prasetyo, Anton
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.2025.10.2.519-527

Abstract

Strontium titanate (SrTiO3) refers to a perovskite structure compound reported to have photocatalyst properties. It is well-known that modifying the particle morphology is found to be capable of enhancing the photocatalytic activity as it can increase the reaction sites on the solid surface. Molten salt synthesis is one of the compound synthesis methods to produce the homogeneous particle size as well as the unique morphology. One of the parameters determining the product compound obtained using the molten salt method is the type of salt used. In this study, the SrTi0.95Fe0.05O3 was synthesized by the molten salt method using NaCl, KCl, and NaCl/KCl salt. It also studied the effects of chloride salt type to structure, vibration mode, morphology particle, band gap energy, and thermal stability of product samples. The diffractograms showed that SrTi0.95Fe0.05O3 were successfully synthesized; however, the sample obtained using molten KCl salt had the impurities of TiO2, and SrCO3 (residual of precursors) indicating that the KCl flux was insufficient to make a complete reaction. The characteristic of infrared vibration modes of the SrTiO3 compound were found in all samples. The image of scanning electron microscopy showed that all particle morphology was in the quadrate-particle shape, and the SrTi0.95Fe0.05O3-KCl sample had the smallest particles for having the largest surface area. The Kubelka-Munk equation calculation results showed that all samples’ band gap energy was approximately at ∼3 eV. The DSC curve showed a relatively similar pattern; therefore, the thermal stability properties of all samples were similar.
Sonochemical Synthesis of Rutile Phase Copper-Doped Titanium Dioxide Coating on Fabric and Its Application in Antibacterial Testing of Staphylococcus aureus Chew, Yi Bin; Ling, Chui Min; Koh, Pei Wen; Chew, Chee Seng; Lee, Siew Ling
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.2025.10.2.605-613

Abstract

In recent years, the utilization of copper-doped titanium dioxide (Cu-TiO2) photocatalysts in antimicrobial activity has received intensive attention from researchers, especially during the COVID 19 pandemic. However, the common synthesis method of Cu-TiO2 such as the sol-gel method would not be applicable in the industrial processes because of the low production yield of the photocatalysts. Besides, anatase TiO2 is always arguable due to its high cost and less stable after a long synthesis process. Therefore, in this study, the sonochemical method was utilized to produce the Cu-TiO2 photocatalysts using TiO2 rutile as a precursor. The physicochemical properties of the synthesized photocatalysts were examined via several instrumental techniques. As evidenced by the X-ray diffraction (XRD) analysis, all the Cu-TiO2 samples were formed in the rutile phase. Diffuse reflectance ultraviolet-visible (DRUV-Vis) analysis results indicated the wavelength extension to the visible region upon Cu loading. The antibacterial properties of Cu-TiO2 photocatalysts were assessed via antibacterial testing using the Gram-positive bacteria, Staphylococcus aureus. The results indicated that the 5 mol% Cu-TiO2 achieved the highest antibacterial efficiency of 75.8% under visible light irradiation for 1 hour. The current findings suggest that the Cu-TiO2 photocatalysts could be produced via a straightforward and cost-effective synthesis method, which may continue with large-scale production and for application as an antimicrobial agent.
Potential of Bitter Melon (Momordica charantia L.) Extract for Chronic Kidney Disease Based on In Vitro Study via TGF/SMADs Signaling, Antioxidant, Antiinflammation, Apoptosis Inducer Activities Prahastuti, Sijani; Rahardja, Fanny; Wargasetia, Teresa Liliana; Zahiroh, Fadhilah Haifa; Sabrina, Adilah Hafizha Nur; Kusuma, Hanna Sari Widya; Azis, Rizal; Hadiprasetyo, Dhanar Septyawan; Ningrum, Siti Ratu Rahayu; Widowati, Wahyu; Sarwono, Sylvie
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.2025.10.2.538-551

Abstract

Chronic kidney disease (CKD) is a physiological abnormality in the kidneys whose prevalence is expected to continue to increase. On the other hand, Bitter melon (Momordica charantia L.) is known to have the potential to manage CKD. This study explores the compound content of M. charantia ethanol extract (MCEE) and its potential for CKD based on in vitro assays. To model chronic kidney disease (CKD), SV40 MES-13 (mouse glomerular mesangial) cells were exposed for 3 days to 20 mM glucose. After glucose induction, the cells were subjected with different concentrations of MCEE (Momordica charantia L. ethanolic extract). The chemical profile of MCEE was analyzed using LC/MS-MS. Cell viability was examined through the WST assay, while intracellular ROS and apoptosis levels were measured by flowcytometry. Colorimetry was used to analyze SOD, MDA, and CAT levels. ELISA was used to analyze inflammatory proteins (TGF-β 1, IL-6, TNF-α, IL-1β ) levels. Meanwhile, the relative gene expression of SMAD-2, SMAD-3, SMAD-4, SMAD-7 was examined through qRT-PCR. The results exhibited that MCEE contains cucurbitane p-coumaric, ferulic acid, caffeic acid, gallic acid, chlorogenic acid, and epicatechin. MCEE was also known to be non-toxic to SV40 MES-13 cells. In addition, MCEE reduced intracellular ROS levels, MDA, necrosis levels, and inflammatory proteins, while also regulating SMAD-2, SMAD-3, and SMAD-4 gene expression. MCEE increased levels of CAT, and SOD, and regulated SMAD-7 gene expression in the CKD cells model. The most effective MCEE is MCEE 50 μg/mL. MCEE demonstrated potential as a CKD treatment based on in vitro studies through TGF/SMADs signaling activity, antioxidant, anti-inflammatory, and apoptosis inducer.
Avicennia officinalis L. - A Promising Source for The Creation of Medicines for Hepatoprotective and Antioxidant Activities in HepG2 Cell Line and Mice Duong, Tuyet-Ngan; Nguyen, Ngoc-Van Thi; Nguyen, Ngoc-Anh; Do, Hong-Tuoi Thi; Le, Kim-Anh Thi; Dai, Xuan-Trang Thi; Duong, Cao-Duy; Thang, Truc-Ly Thi; Le, Huynh-Duc; Huynh, Mai-Tram Thi
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.2025.10.2.432-442

Abstract

Avicennia officinalis L. (AOL), a mangrove plant, is extensively used as an anti-inflammatory, anti-cancer, and antioxidant which has traditionally utilized this plant as herbal in Vietnam. In preliminary phytochemical screening, the methanol and aqueous leaf extracts showed high levels of bioactive compounds including glycosides, saponins, flavonoids, tannins, and triterpenes. To identify the major compounds in five extracts of AOL (leaves, flowers, fruits, roots, and bark), the quantitative HPLC/PDA technique was utilized. It was discovered that the total flavonoid content and total phenolic content were 52.55±0.070 and 16.59±0.030 mg/g extract, respectively. The result of antioxidant activity in vitro was shown leave and bark extract with the strongest activity (citric acid aqueous leave with EC50 =43.52 µg/mL in DPPH assay and tartaric acid aqueous bark extract with 30.69% of inhibition in TBRAS assay). Citric acid aqueous leaf extract (CALE) demonstrated 17.08% of the protective activity against CCl4-induced hepatoxicity in HepG2 cells (p < 0.05). CALE was standardized in order to assess its potential hepatoprotective effects against a mouse model of paracetamol-induced liver injury. The extract was administered orally to the animals at two different dosage levels (200 and 400 mg/kg b.wt.). For a duration of one week, the dosage was administered once daily. By improving the blood levels of biochemical, AOL demonstrated a notable dose-dependent hepatoprotective effect. The action of the standardized AOL was found to be similar to that of silymarin. AOL collected in Vietnam has a lot of potential to become a traditional medicine source.
Antibacterial Properties of Taro: Extraction, Antibacterial Testing Method, Modification and Application Atina; Royani, Idha; Assa'idah; Arsyad, Fitri Suryani
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.2025.10.2.374-401

Abstract

Taro plants (Colocasia esculenta) contain secondary metabolites identified as antibacterial, antioxidant, anti-inflammatory and anticancer such as alkaloids, glucosides, terpenoids, resins, flavonoids, saponins, phenols, tannins, amino acids. This article discusses various sources related to the potential of taro as an antibacterial, the discussion includes the content of secondary metabolites along with their properties and characteristics, medicinal plant extraction methods, antibacterial testing, applications and future challenges. This review research used data in the form of articles from Scopus, PubMed and Web of Science indexed sources, published between 2015-2024. Data were analyzed descriptively to summarize trends in antibacterial activity and variability across studies. Ethanol extract of taro was screened for secondary metabolite content, antibacterial activity was tested by Kirby Bauer method. Synthesis of antibacterial medicinal plant-based nanoparticles were successfully synthesized with size range between 10-120 nm, with inhibition zones between 11.9-37 mm against pathogens such as S. aureus, E. coli, and L. monocytogenes. Antibacterial nanofibers were synthesized by electrospinning, self-assembly, phase separation, template synthesis, coaxial electrospinning,electrospraying. Characterization used UV-Vis Spectroscopy, FTIR, TEM, XRD, SEM-EDX, HPLC to separate, identify, and quantify bioactive compounds. Common antibacterial mechanisms include inhibition of protein and nucleic acid synthesis, cell membrane damage, and cell structure modification. The application of taro as antibacterial is investigated in pharmaceutical field, industrial field, food field, waste treatment, dentistry field, biomedical field. The development of taro as an antibacterial has great prospects in the pharmaceutical industry, especially as a safe and effective alternative to conventional antibiotics.
The Partition Dimension of Daisy Graphs and Its Barbell Asmiati; Rachmawati, Aulia Ajie; Nurvazly, Dina Eka; Hamzah, Nur
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.2025.10.2.313-319

Abstract

The partition dimension of a graph is determined by minimum number of vertex partitions such that every vertex has different distances to the ordered partitions. A complete graph is very easy to determine its partition dimension because each vertex has the same distance to other vertices. However, what are the partition dimension if a complete graph is modified so that it becomes a daisy graph. In this paper, we discuss the partition dimension of daisy graphs. Next, we will also provide barbell graph operations on daisy graphs.
Synthesis and Characterization of Co3O4 and ZnO Nanoparticles Based on Schiff Base Complexes as a Precursor to the Photocatalytic Photodegradation of Congo Red Dye Raji, Shahad Qasim; Bader, Ali Taleb
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.2025.10.2.420-431

Abstract

The synthesis of [Co(HBZAP)(OAC)2]2H2O and [Zn(HBZAP)(OAC)2] H2O complexes was successfully performed through reflux in connection with the Schiff bases synthesized with metal salt acetate hydrate. Identification of the synthesized complexes was performed by Fourier transform infrared FTIR, UV-Vis, magnetic moment,1H, and 13C-NMR spectroscopy and X-Ray diffraction XRD. These studies show the Schiff base ligand as bidentate due to oxygen from the phenolic group and nitrogen from the azomethane group for complexation with Co(II) and Zn(II), resulting in a tetrahedral configuration of the complexes around the metal ions. Conductivity measurements in DMSO demonstrated that none of the complexes would permit the conduction of electricity. Co3O4 and ZnO nanoparticles were synthesized from these Co(II) and Ni(II) complexes. FTIR and UV-Vis spectra, as well as FE-SEM images, were used to identify the synthesized nanostructures. These results show that the Co3O4 and ZnO nanoparticles have cubic and hexagonal systems, respectively. The average crystallite sizes of Co3O4 and ZnO are 36.5 and 31.9 nm, respectively. These nanoparticles show excellent photocatalytic activity when used under UV light to degrade Congo red dye in aqueous media for 120 minutes of 91.4% and 60.6%.
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.

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