Science and Technology Indonesia
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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<![CDATA[Isolation and Molecular Identification of Direct Red 80 Synthetic Dye Degradation Bacteria from Palembang Indonesia Jumputan Cloth Industrial Waste ]]>
<![CDATA[Muharni]]>;
<![CDATA[Elisa Nurnawati]]>;
<![CDATA[Heni Yohandini]]>;
<![CDATA[Hary Widjajanti]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.429-435
<![CDATA[Industrial waste from Jumputan cloth production pose a significant risk to environmental safety due to their toxic synthetic dye content. Several studies have shown that the presence of bacteria in these materials plays a very important role in decolorization process of the constituent dye. Therefore, this study aims to isolate bacteria with the ability to decolorize direct red 80 from Jumputan cloth industrial waste. Characterization of isolates was carried out macroscopically, microscopically, and biochemically, followed by molecular identification using the 16S rRNA gene. Decolorization effects of the samples on red dye 80 were then assessed using a spectrophotometer at a maximum wavelength of 528 nm. The results showed that 6 bacteria isolates can degrade dye, with decolorizing power ranging from 26.33±0.94 - 73.67±0.47. The highest potential for decolorizing waste synthetic dye is seen in isolate BD 05. Phylogenetic analysis showed that there were 3 genera of bacteria among the samples obtained, namely Bacillus, Aeromonas, and Pseudomonas. These bacteria were closely related to Bacillus tropicus, Areomonas jandaei, and Pseudomonas stutzeri. Pseudomonas stutzeri (BD 05) has the highest potential in handling jumputan industrial waste.]]>
<![CDATA[The Subclasses of Analytic Functions of Complex Order with Application of q-Derivative Operators ]]>
<![CDATA[Aini Janteng]]>;
<![CDATA[Desmond Lee Ching Yiing]]>;
<![CDATA[Yong Enn Lun]]>;
<![CDATA[Jaludin Janteng]]>;
<![CDATA[Lee See Keong]]>;
<![CDATA[Rashidah Omar]]>;
<![CDATA[Andy Liew Pik Hern]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.436-442
<![CDATA[In this article, we represent A as the of analytic functions in the open unit disk. Further, new subclasses of analytic functions of complex order utilising q-derivative operator are generated. The subclasses are symbolised by Hq,b(ϕ) and Iq,b(ϕ). Additionally, we discover that these function classes are implicated with the Fekete-Szegö inequalities.]]>
<![CDATA[Uncovering Obstacles to Household Waste Recycling in Seremban, Malaysia through Decision-Making Trial and Evaluation Laboratory (DEMATEL) Analysis. ]]>
<![CDATA[Zahari Md Rodzi]]>;
<![CDATA[Ashiera Nadiha Hazri]]>;
<![CDATA[Nurul Ain Syahirah Mohd Azri]]>;
<![CDATA[Nurul Dania Farisha Sharul Rhmdan]]>;
<![CDATA[Zati Aqmar Zaharudin]]>;
<![CDATA[Saladin Uttunggadewa]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.422-428
<![CDATA[This study investigates the barriers to household waste recycling in Seremban, Malaysia, using the Decision-Making Trial and Evaluation Laboratory (DEMATEL) analysis. The research questions aimed to identify and rank the most significant barriers to recycling and understand the causal relationships between them. The study found that limited access to recycling facilities and services and lack of motivation or incentive to recycle were the most significant causes of household waste recycling barriers in Seremban. Onthe other hand, lack of motivation or incentive to recycle and negative attitudes towards recycling, were identified as the most significant effects. The study’s findings have theoretical implications for waste management and sustainable development and offer practical implications for policymakers and waste management practitioners in developing effective waste management strategies and policies that can address these barriers. Furthermore, the study’s insights into the most significant barriers to household waste recycling can inform the design of recycling campaigns and educational programs to increase awareness and promote household waste recycling in Seremban. Overall, this study provides a valuable contribution to the field of waste management and sustainable development and offers insights into the challenges of promoting household waste recycling in urban areas.]]>
<![CDATA[On Distance Vertex Irregular Total k-Labeling ]]>
<![CDATA[Dian Eka Wijayanti]]>;
<![CDATA[Noor Hidayat]]>;
<![CDATA[Diari Indriati]]>;
<![CDATA[Abdul Rouf Alghofari]]>;
<![CDATA[Slamin]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.479-485
<![CDATA[Let H= (T,S), be a finite simple graph, T(H)= T and S(H)= S, respectively, are the sets of vertices and edges on H. Let σ:T∪S→1,2,· · · ,k, be a total k-labeling on H and wσ(x), be a weight of x∈T while using σ labeling, which is evaluated based on the total number of all vertices labels in the neighborhood x and its incident edges. If every x∈T has a different weight, then σ is a distance vertex irregular total k-labeling (DVITL). Total distance vertex irregularity strength of H (tdis(H) is defined as the least k for which H has a DVITL. Our research investigates the DVITL of the path (Pr) and cycle (Cr) graphs. We establish a lower bound and then calculate the precise value of tdis(Pr) and tdis(Cr).]]>
<![CDATA[Development and Validation GC/MS Method for Methamphetamine Analysis in Urine by Miniaturization QuEChERS ]]>
<![CDATA[Soraya Aulia]]>;
<![CDATA[Riesta Primaharinastiti]]>;
<![CDATA[Djoko Agus Purwanto]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.451-460
<![CDATA[This paper explains the development of a quick and easy gas chromatography (GC) approach to identify methamphetamine in urine. This research used gas chromatography with mass spectroscopy and a capillary column TG-5SILMS (5% phenyl methyl siloxane, 30 m x 0.32 x 25 m). The carrier gas flow rate was set at 1.0 mL/minute, the temperature inlet and detector had been set at 300°C, and the oven temperature was programmed to initiate at 50°C and held for 1.5 minutes before being raised to 300°C at a rate 40°C/minute and held for 3 minutes. Sample pre-treatment by modification of the QuEChERS method includes using a relatively large amount of inorganic salt, extraction volume and extraction cycle. The optimal conditions for processing a 400 uL urine sample were 160 mg magnesium sulphate, 40 mg sodium chloride, and 400 uL acetonitrile for organic solvent. According to the validation test, the detection limit for methamphetamine was 0.36 ug/mL; the quantitation limit was 1.09 ug/mL, and the calibration curve followed the regression line. y=1.0489x-3.7914, coefficient (r) was 0.9973. The recovery of the analyte spiked into urine at 5, 7 and 9 ug/mL on average was 100.5±2.33% for intraday dan 93.3±7.21% for interday. The precision was excellent, with an average coefficient of variation of 2.31%. The procedure was applied to four urine samples from drug users and the first abuser (25.51 ug/mL), the second abuser (15.05 ug/mL), the third abuser (17.72 ug/mL) and the last abuser (3.08 ug/mL) were all satisfactorily quantitated.]]>
<![CDATA[Bismuth Silicate/Silica-Titania Synthesis from In Situ Decomposition of Oil Palm Leaves as Silica Source ]]>
<![CDATA[Salprima Yudha S]]>;
<![CDATA[Morina Adfa]]>;
<![CDATA[Swadexi Istiqphara]]>;
<![CDATA[Muhamad Alvin Reagen]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.397-402
<![CDATA[In this work, bismuth silicate-titania has been synthesized in two stages by utilizing bismuth oxynitrate as an elemental source of bismuth, oil palm leaves (OPL) as a source of silica and titanium tetraisopropoxide (TTIP) as source of titania (TiO2). In the first stage,bismuth silicate/silica (Bi4Si3O12/SiO2) was formed, which occurs due to the in-situ decomposition of palm leaves and reacts directly with the bismuth precursor at high temperatures (900oC). The reaction could possibly occur through a solid-state reaction mechanism between bismuth oxide and silica or through a more complex mechanism within the reaction mixture. The resulting product then reacts with TTIP, which is added and heated at the same temperature to form Bi4Si3O12/SiO2-TiO2 (bismuth silicate/silica-titania). Characterization of the as-prepared product using X-ray diffraction showed the dominance of bismuth silicate and small amount of titania (TiO2). As a result, TiO2 could not be detected in the diffractogram. Nevertheless, an analysis using energy-dispersive X-rays showed the presence of titanium elements in the resulting composite. The results of this study can be used to develop ternary metal oxides based on natural resources and agricultural wastes, such as oil palm leaves.]]>
<![CDATA[Dynamics of Extreme Rainfall and Its Impact on Forest and Land Fires in the Eastern Coast of Sumatra ]]>
<![CDATA[Hamdi Akhsan]]>;
<![CDATA[Muhammad Irfan]]>;
<![CDATA[Supari]]>;
<![CDATA[Iskhaq Iskandar]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.403-413
<![CDATA[This article examines the extreme climate events on the Eastern Coast of Sumatra over four decades (1981-2019) based on the extreme rainfall index defined using the Expert Team on Climate Change Detection and Indices (ETCCDI). The indices used include Consecutive Dry Day (CDD and the total rainfall per year (PRCPTOT). Theses indices were calculated and are based on the daily observation data from eight quality-controlled weather stations. While overall trends in extreme rainfall indices are not significant, there is a noticeable trend towards drought, with CDD rising by 1.23 days per decade and PRCPTOT decreased by 3.16 mm/year. The correlation between the Dipole Mode Index (DMI) and extreme rainfall indices in the August-September-October-November (ASON) period was positive, with CDD increasing with the more positive DMI value. On the other hand, the PRCPTOT index showed a decrease as the DMI more positive. The ENSO index and CDD are positively correlated during the dry season, while ENSO index negatively correlates with PRCPTOT. The duration of CDD during El Niño/positive Indian Ocean Dipole (IOD) events in 1997, 2015, and 2019 had significant impact on the forest and land fires on the Eastern Coast of Sumatra. The results are useful for policymakers in preventing forest and land fires on the Eastern Coast of Sumatra.]]>
<![CDATA[Preparation of Al2O3 /PVA Nanocomposite Thin Films by a Plasma Jet Method ]]>
<![CDATA[Saba Jawad Kadhem]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.471-478
<![CDATA[Alumina thin films have significant applications in the areas of optoelectronics, optics, electrical insulators, sensors and tribology. The novel aspect of this work is that the homogeneous alumina thin films were prepared in several stages to generate a plasma jet. In this paper, aluminium nanoparticles suspended in vinyl alcohol were prepared using exploding wire plasma. TEM analysis was used to determine the size and shape of particles in aluminium and vinyl alcohol suspensions; the TEM images showed that the particle size is 17.2 nm. Aluminium/poly vinyl alcohol (Al/PVA) thin films were prepared using this suspension on quartz substrate by plasma jet technique at room temperature with an argon gas flow rate of 1 L/min. The Al/PVA thin films were thermally converted to alumina films, where they were annealed at different temperatures (700, 800, or 900°C). X-ray diffraction (XRD), atomic force microscopy (AFM), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) techniques were used to characterise these thin films before and after annealing process. The diffraction patterns of the prepared thin films before subjecting them to the annealing process indicated the presence of peaks belonging to aluminium and PVA; however, the diffraction patterns and FTIR spectra obtained for these films after the annealing process showed peaks indicating the formation of alumina films of different phases. AFM and SEM investigations proved that the formed particles for all prepared films before and after the annealing process were similar in size and almost spherical; the diameter of the particles was on the order of a few nanometres. To control the properties of prepared thin films, the plasma which was used to produce thin films is diagnosed spectrophotometrically. The generated plasma was diagnosed using optical emission spectroscopy to estimate the electron temperature Te; the electron temperature was 1.925 eV.]]>
<![CDATA[Gastroprotective Effects of Dendropthoe pentandra Leaf Ethanol Extract on Peptic Ulcer Animal Models ]]>
<![CDATA[Fitrya Fitrya]]>;
<![CDATA[Annisa Amriani]]>;
<![CDATA[Rennie Puspa Novita]]>;
<![CDATA[Fadila Kurnia]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.382-387
<![CDATA[Dendrophthoe pentandra (Loranthaceae) is a semi-parasitic plant with several diverse metabolites and biological activities and is widely used in traditional medicine. This study aims to evaluate the gastroprotective effectiveness of the ethanol extract of D. pentandra leaves in animals induced by an acute peptic ulcer with absolute ethanol. The gastroprotective effect of the extract (100, 250 and 500 mg/kg doses) was evaluated through ulcer index parameters, physicochemical properties of gastric fluid, and histopathological analysis. The study results of the study showed that the ethanol extract of D. pentandra leaves at a dose of 500 mg/kg could provide a protective effect equivalent to omeprazole. Histopathological analysis proved the improvement of the mucous membrane structure in the animals pre-treated with the extract. Based on these findings, it can be concluded that the ethanol extract of D. pentandra leaves is effective as an anti-ulcer drug, so it is feasible to be developed as a gastroprotective from herbal.]]>
<![CDATA[Hydroxyapatite-ZnO Biomimetic Toothpaste Formulation from Rice Snail Shell Waste ]]>
<![CDATA[Wisaeni Intannia]]>;
<![CDATA[Charlena Charlena]]>;
<![CDATA[Irma Herawati Suparto]]>
<![CDATA[ Science and Technology Indonesia Vol. 8 No. 3 (2023): July ]]>
Publisher : <![CDATA[Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya ]]>
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DOI: 10.26554/sti.2023.8.3.486-493
<![CDATA[Toothpaste is a preparation for dental treatment to clean, beautify, and replace minerals that decay from the surface of the teeth. Prevention of damage to the mineral layer of the teeth, the addition of remineralizing agents to toothpaste preparations in the form of hydroxyapatite-ZnO composites is carried out. This study aims to synthesize and characterize hydroxyapatite-ZnO, as well as to formulate hydroxyapatite-ZnO toothpaste from rice field conch shell waste. Hydroxyapatite-ZnO composites have been successfully synthesized using the sol-gel method and characterized using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX). The XRD result obtained a crystal size of 59.90 nm with a crystallinity percentage of 68.85%. The absorption band at a wave number of 452 cm−1 is an indication that the ZnO compound has been successfully combined with hydroxyapatite. SEM-EDX analysis showed that the morphology of the compound was granular with a rough surface, uneven size, and shape. The results of the hydroxyapatite-ZnO toothpaste formulation in the 45% formula had good physical stability compared to other formulas. The antibacterial properties of hydroxyapatite-ZnO toothpaste preparations showed a very strong inhibitory effect on Streptococcus mutans bacteria. The results of the hydroxyapatite-ZnO toothpaste formulation in the 45% formula had good physical stability compared to other formulas. The antibacterial properties of hydroxyapatite-ZnO toothpaste preparations showed a very strong inhibitory effect on Streptococcus mutans bacteria. The results of the hydroxyapatite-ZnO toothpaste formulation in the 45% formula had good physical stability compared to other formulas. The antibacterial properties of hydroxyapatite-ZnO toothpaste preparations showed a very strong inhibitory effect on Streptococcus mutans bacteria.]]>
