cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Ivandini Tribidasari A.
Contact Email
ivandini.tri@sci.ui.ac.id
Phone
+622129120943
Journal Mail Official
editor_mss@ui.ac.id
Editorial Address
Directorate of Research and Community Engagement UNIVERSITAS INDONESIA UI Campus, Depok 16424 Indonesia
Location
Kota depok,
Jawa barat
INDONESIA
Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss
Core Subject :
Makara Journal of Science publishes original research or theoretical papers, notes, and minireviews on new knowledge and research or research applications on current issues in basic sciences, namely: Material Sciences (including: physics, biology, and chemistry); Biochemistry, Genetics, and Molecular Biology (including: microbiology, physiology, ecology, taxonomy and evolution); and Biotechnology.
Arjuna Subject : -
Articles 15 Documents
 1   2 
Search results for , issue "Vol. 29, No. 2" : 15 Documents clear
Production and Characterization of Biodiesel from Malapari Seed Oil (Pongamia pinnata L.): Evaluation of Quality Parameters Based on the Indonesian National Standard (SNI) 04-7182-2015 Taebenu, Desi Adriyanti Nina; Arpiwi, Ni Luh; Astarini, Ida Ayu
Makara Journal of Science Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study produced biodiesel from Malapari seed oil (Pongamia pinnata L.) by optimizing the esterification and transesterification processes. The objectives of this study were to determine the sulfuric acid (H2SO4) catalyst concentration in the esterification reaction that can reduc the free fatty acid (FFA) content of the seed oil to ≤2%, analyze the oil to methanol molar ratio (i.e.,1:6, 1:9, and 1:12) and KOH concentration (i.e.,2%, 4%, and 6%) that will produce the highest biodiesel yield, and evaluate the quality of the produced biodiesel according to the Indonesian National Standar (SNI) 04-7182-2015. The research was conducted from October to December 2023 at the Plant Physiology Laboratory and the Physical Chemistry Laboratory, FMIPA, UNUD. The research applied Completely randomized design. Quantitative biodiesel data were analyzed using Analysis of Variance. If significant differences (α < 0.05) were detected, then the quantitative biodiesel data were further analyzed using Duncan's Post Hoc Test. Results showed that an H2SO4 concentration of 7% reduced the FFA content to 1.915%. A molar ratio of 1:12 with a 2% KOH catalyst produced the highest biodiesel yield of 65.35%. The produced met the SNI for the saponification number (i.e., 52.82–133.69 mg-KOH/g), iodine number (i.e.,7.19–22.42 g_I2/100_g), and cetane number (i.e., 86.48–132.68). However, the water content (i.e., 0.721%–2.407%), viscosity (i.e., 1.73–6.18 mm²/s), acid number (i.e., 0.224–4.685 mg_KOH/g), density (i.e., 874–917 kg/m³), FFA content (i.e., 0.116 -% to 2.229%), and methyl ester content (48,13% to–132.12%_mass) partially did not meet the standards. This study highlights the potential of Malapari seed oil as a biodiesel feedstock, with further required needed to meet all quality standards.
Effect of Mercury Dose Variation on Growth and Nitrate Reductase Activity in Aquarius palifolius (Nees & Mart.) Christenh. & Byng Nurhanifah, Tsurayya; Siswanti, Dwi Umi
Makara Journal of Science Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mercury, a byproduct of mining, can harm the environment. One method to reduce this impact is through phytoremediation. This study used the Mexican sword (Aquarius palifolius), a plant with the potential to absorb and accumulate mercury. The aim of this study was to examine the effect of mercury stress on nitrate reductase activity, which plays a role in plant productivity, and to assess its impact on growth parameters, including plant height growth rate, leaf length, and number of leaves. Three-month-old A. palifolius plants obtained from rice fields in Sleman were treated with mercury at doses of 0, 14, 16, 18, and 20 ppm. The experiment was conducted in triplicate. Nitrate reductase activity was measured using a spectrophotometer, and growth rate was observed over 15 days. Data were analyzed using One-way analysis of variance (ANOVA) and evaluated using Duncan’s Multiple Range Test (DMRT). Mercury exposure led to adaptations, including a 9.5%–13.5% change in nitrate reductase activity and a 50%–65% reduction in the number of leaves. Growth rates of plant height and number of leaves showed no significant differences, even under mercury stress. These results indicate that A. palifolius can tolerate mercury concentrations of 14–20 ppm and has the potential to functions as a phytoremediation agent.
Characterization and Drug Release Evaluation of Chlorhexidine-Encapsulated Silica Nanoparticles for Potential Root Canal Disinfection Rakhmawati, Widya; Harmaji, Andrie; Djati, Fanni Kusuma; Sunendar, Bambang
Makara Journal of Science Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The failure of root canal treatments is often attributed to bacterial invasion of the dentinal tubules, where pathogens can persist and complicate healing. Chlorhexidine digluconate, a potent antimicrobial agent, has been widely utilized for its broad-spectrum antibacterial effects. However, challenges remain in achieving efficient distribution and sustained release within the root canal system. This study investigates the encapsulation of chlorhexidine digluconate within silica nanoparticles as a novel drug delivery system that is aimed at improving root canal treatment outcomes. Silica nanoparticles were synthesized using the sol-gel method and subsequently immersed in a 2% chlorhexidine digluconate solution for 15 to 30 minutes to achieve encapsulation. The resulting materials were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and ultraviolet–visible (UV–Vis) spectroscopy. SEM analysis revealed particle sizes in the range of 80–150 nm for nanoparticles aged for 15 minutes and in the range of 250–350 nm for those aged for 30 minutes. FTIR spectroscopy confirmed the presence of functional groups characteristic of silica, chitosan, and sodium alginate, indicating successful encapsulation. The UV–Vis spectrophotometry demonstrated that silica nanoparticles aged for 30 minutes exhibited a more stable and controlled release of chlorhexidine digluconate (0.08 ppm) over a 60-minute period. This study presents a novel approach for enhancing root canal treatment, in which silica nanoparticles are utilized for controlled drug delivery. Additionally, the study shows that longer aging times may offer improved stability and efficacy in sustained antimicrobial action. The findings suggest that the use of silica-encapsulated chlorhexidine nanoparticles is a promising strategy for more effective endodontic treatment because it addresses bacterial invasion and supports long-term therapeutic effects.
Studying the Effect of the Addition of SiC Molecules as a Nanocomposite on the Optical Properties of a PMMA-PS Blend Azeez, Hussein Mejbel; Hussein, Marwan Hadi; Abbood, Hussein Abosaooda; Rabee, Bahaa Hussein
Makara Journal of Science Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In this study, a nanocomposite was prepared using a solution casting technique. The polymer electrolyte blend was formed by combining 0.6 mg of polymethyl methacrylate (PMMA) and 0.4 mg of polystyrene (PS). Subsequently, silicon carbide (SiC) nanoparticles were incorporated into the polymer matrix at varying and precisely measured concentrations. The composite was thoroughly mixed to ensure homogeneity, and Fourier transform infrared spectroscopy spectral analysis confirmed the absence of chemical interactions between the SiC nanoparticles and the polymer components, indicating a physically stable mixture. The above can be reflected in the synthesized compound with new properties, such as semiconductors or semi-insulators. This study aimed to investigate the effect of nanoparticle concentrations on the structure and optical properties of the synthesized samples. To achieve this objective, various techniques were used to characterize the prepared sample, including optical microscopy with a power of 10× and UV-VIS spectroscopy. The absorptivity at the wavelength (200–1100 nm) was also recorded, and the absorption coefficient (a), transmittance (T), real and imaginary dielectric constant (e1 and e2), energy gap of the indirect permissible and forbidden transitions (Eg), extinction coefficient (k0), and refractive index (n) were determined. Based on calculations of previously determined quantities and properties, it was found that the overlap and diffusion of nanoparticles within polymer structures (PS-PMMA) enhanced the optical properties of these nanoparticles as their concentrations increased
Effect of Sorbitol Plasticizer on Bioplastics Properties Based on Oil Palm Empty Fruit Bunches (OPEFB) and Jackfruit Seed Starch Sasria, Nia; Afifah, Vita Nur; Nur Tajalla, Gusti Umindya
Makara Journal of Science Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In bioplastics, natural materials that are easily decomposed are used to minimize plastic waste. In this research, the compositions used were cellulose from oil palm empty fruit bunches (OPEFB), jackfruit seed starch, and carboxymethyl cellulose (CMC) as a filler with sorbitol as a plasticizer. This study aimed to analyze the effect of a sorbitol plasticizer on bioplastic properties. The study began by extracting jackfruit seed starch and OPEFB cellulose. Subsequently, bioplastics were prepared by varying sorbitol, namely 0 (S – 0), 0.5 mL (S – 0.5), 1 mL (S – 1), and 1.5 ml (S – 1.5), with CMC 20%. As a result, the S – 0 variation showed the highest water resistance at 43.44%. The highest biodegradation test was in the S – 1.5 variation of 48.54% for 6 days in the soil media. The SEM test found voids in the S – 1.5 sample. Next, the best tensile strength test in the S – 0 variation was 5.44 MPa, while the S – 1.5 variation had the optimum elongation value at 13.54%. Overall, the nature of resistance to water and tensile strength were directly proportional. However, these two samples were inversely proportional to biodegradation and elongation. Meanwhile, the characteristics of biodegradation and elongation were directly compared.

Page 2 of 2 | Total Record : 15

 1   2 

Filter by Year

2025 2025


Reset
Filter By Issues
All Issue Vol. 29, No. 3 Vol. 29, No. 2 Vol. 29, No. 1 Vol. 28, No. 4 Vol. 28, No. 3 Vol. 28, No. 2 Vol. 28, No. 1 Vol. 27, No. 4 Vol. 27, No. 3 Vol. 27, No. 2 Vol. 27, No. 1 Vol. 9, No. 1 Vol. 26, No. 4 Vol. 26, No. 3 Vol. 26, No. 2 Vol. 26, No. 1 Vol. 25, No. 4 Vol. 25, No. 3 Vol. 25, No. 2 Vol. 25, No. 1 Vol. 24, No. 4 Vol. 24, No. 3 Vol. 24, No. 2 Vol. 24, No. 1 Vol. 23, No. 4 Vol. 23, No. 3 Vol. 23, No. 2 Vol. 23, No. 1 Vol. 22, No. 4 Vol. 22, No. 3 Vol. 22, No. 2 Vol. 22, No. 1 Vol. 12, No. 1 Vol. 21, No. 4 Vol. 21, No. 3 Vol. 21, No. 2 Vol. 21, No. 1 Vol. 20, No. 4 Vol. 20, No. 3 Vol. 20, No. 2 Vol. 20, No. 1 Vol. 19, No. 4 Vol. 19, No. 3 Vol. 19, No. 2 Vol. 19, No. 1 Vol. 18, No. 4 Vol. 18, No. 3 Vol. 18, No. 2 Vol. 18, No. 1 Vol. 17, No. 3 Vol. 17, No. 2 Vol. 17, No. 1 Vol. 16, No. 3 Vol. 16, No. 2 Vol. 16, No. 1 Vol. 15, No. 2 Vol. 15, No. 1 Vol. 14, No. 2 Vol. 14, No. 1 Vol. 13, No. 2 Vol. 13, No. 1 Vol. 12, No. 2 Vol. 11, No. 2 Vol. 11, No. 1 Vol. 10, No. 2 Vol. 10, No. 1 Vol. 9, No. 2 Vol. 8, No. 3 Vol. 8, No. 2 Vol. 8, No. 1 Vol. 7, No. 3 Vol. 7, No. 2 Vol. 7, No. 1 Vol. 6, No. 3 Vol. 6, No. 2 Vol. 6, No. 1 More Issue