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INDONESIA
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)
Published by Universitas Sriwijaya
ISSN : 25409395     EISSN : 25409409     DOI : -
Core Subject : Science, Social,
Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science
Indonesian Journal of Fundamental and Applied Chemistry (IJFAC) is an international research journal and invites contributions of original research articles as well as review articles in several areas of chemistry. The journal aims to publish refereed, high-quality research papers with significant novelty and short communications in all branches of chemistry. Papers which describe novel theory and its application to practice are welcome, as are those which illustrate the transfer of techniques from other disciplines. IJFAC calls for papers that cover the following fields: Biochemistry Inorganic chemistry Physical chemistry Organic chemistry Analytical chemistry Applied Chemistry All papers are peer reviewed by at least two referees. Papers presented at conferences are peer reviewed and selected with the same standards as individually submitted papers. They therefore have the same archival value. Article should be submitted by the Online Submission Module at www.ijfac.unsri.ac.id or email to ijfac@unsri.ac.id
Arjuna Subject : -
Articles 196 Documents
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Harnessing Electrochemical Processes for Enhanced Struvite Crystallization: A Comprehensive Review Ariyanto, Eko; Yusmartini, Eka Sri; Gusmiatun, Gusmiatun; Fatimah, Fatimah; Purwoko, Mitayani
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

The recovery of nutrients from contaminated water and wastewater can effectively mitigate both the nutrient burden on water resources and the associated environmental issues affecting aquatic ecosystems. This approach presents a valuable solution towards achieving environmental and societal sustainability. Consequently, struvite crystallization technology has emerged as a promising method for nutrient recovery, as the resulting precipitate can be recycled as a natural fertilizer. This review aims to elucidate the characteristics of struvite and provide insight into the fundamental process of crystallization. Furthermore, it comprehensively discusses the various variables that influence struvite crystallization, with a special focus on its application in urine-contaminated water using electrochemical methods. The review also highlights the advantageous on environmental and economic aspects. In addition, the limitations of struvite crystallization technology are examined, and future research prospects are explored, particularly in the context of electrochemical techniques which offer innovative solutions for controlled nutrient extraction. Ultimately, this work serves as a foundational resource for the future utilization of struvite crystallization technology in nutrient recovery, in response to the escalating environmental challenges and depletion of natural resources.Keywords: Struvite formation, electrochemical process, magnesium anode, struvite crystallization, natural fertilizer
Antibacterial and Antibiofilm Activity Testing of Black Betel Leaves (Piper betle L. var. nigra) Ethanol Extract on Staphylococcus aureus and Pseudomonas aeruginosa Using Microdilution Method Adha, Tasya Hardina; Ikawati, Zullies; Pratiwi, Sylvia Utami Tunjung
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.59

Abstract

The use of antibiotics is key to treating infected wounds. However, its effectiveness has begun to decrease due to the high bacterial resistance, which is caused by the phenomenon of biofilm. Therefore, it’s necessary to discover new antibacterial and antibiofilm activity agents that can be used as alternative therapies. This study aims to test the antibacterial and antibiofilm activity of black betel leaves (Piper betle L. var. nigra) ethanol extract. Antibacterial and antibiofilm activity test was conducted using the microdilution method against Staphylococcus aureus and Pseudomonas aeruginosa with concentration variations 4; 2; 1; 0.5; 0.25; and 0.125 mg/mL, also used positive control kanamycin 10 mg/mL and negative control DMSO 1%. The results showed that the black betel leaves ethanol extract had low antibacterial activity with MIC50 > 4 mg/mL for both bacteria and vigorous antibiofilm activity with MBIC50 < 0.125 mg/mL for S. aureus and MBIC = 0.491 mg/mL for P. aeruginosa. The antibacterial activity of the black betel leaves ethanol extract was lower than it’s antibiofilm activity, the antibacterial and antibiofilm activities of the black betel leaves ethanol extract were higher against S. aureus than P. aeruginosa.Keywords: Antibacterial, Antibiofilm, Piper betle L. var. nigra
Comparison of Alum and Coal-Based Activated Carbon for the Treatment of Raw Water Subroto, Subroto; Said, Muhammad; Ibrahim, Eddy; Hariani, Poedji Loekitowati
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.23

Abstract

The availability of clean water is an essential element for supporting the life cycle and sustainable development. The efficiency of providing raw water sources is an important factor for adequate water quantity and quality. This study examines the effectiveness of alum compared with coal-based activated carbon in the removal of Fe, Mn, and turbidity in raw water from the Lematang River, Muara Enim Regency. Activated carbon in this study was produced using a KOH activator with varying activation temperatures (700 °C, 800 °C, and 900 °C). The research results showed that the quality of the third activated carbon met the active carbon quality standards (moisture, ash content, Methylene blue dye and iodine adsorption capacity), but the activated carbon with activation at a temperature of 800 °C had the largest surface area. Activated carbon was proven more effective in reducing Fe and Mn concentrations than alum, while alum was superior in reducing turbidity. After three cycles of activated carbon regeneration, the reduction in Fe and Mn remained below 5%. These results show that activated carbon is a cost-effective and eco-friendly option for raw water treatment.Keywords: Coal, activated carbon, alum, raw water, regeneration
Study of Mangan Peroxidase (Mnp) Enzymes from Pleurotus Ostreatus Produced using Coffee Grounds and Rice Bran as Substrates through Response Surface Methodology Jannah, Mifthahul; Hermansyah, Hermansyah; Hariani, Poedji Loekitowati
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.68

Abstract

This study aimed to optimize the production of Manganese Peroxidase (MnP) enzyme from Pleurotus ostreatus using agricultural waste substrates such as coffee grounds (CG) and rice bran (RB) through Response Surface Methodology (RSM) approach. Optimization was conducted using a Central Composite Design (CCD) with three main variables, namely MnSO₄ concentration (0.5-1.5) mM, incubation temperature (25-35) °C, and reaction time (20-30) min. The enzyme fractionation process was carried out by ammonium sulfate saturation (0-20%), (20-40%), (40-60%), followed by dialysis, and SDS-PAGE analysis. The results showed that the 0-20% fraction of CG:RB (50:50) substrate had the highest enzyme activity, which was 20.588 ± 0.141 U/mL, with the highest specific activity of 76.967 ± 0.325 U/mg. The highest protein content was found in CG:RB (0:100) substrate at 0.825 ± 0.016 mg/mL. However, the enzyme activity was lower due to the presence of non-enzymatic proteins and natural inhibitors. This study successfully demonstrated that the substrate combination of CG:RB (50:50) provided optimal results for MnP production. The Response Surface Methodology proved effective in optimizing process variables, providing great potential for biotechnology applications using agricultural waste as an environmentally friendly raw material.Keywords: Pleurotus ostreatus, Manganese Peroxidase, Coffee Dregs, Rice Bran, RSM, SDS-PAGE
The Effect of Oxidative Stress on Growth and Antioxidant Activity of Microalgae Oocystis sp Musifa, Eva; Warni, Mega; Talib, Ramanisa Muliani; Dharma, Abdi; Mardiah, Elida; Harvianti, Yuniar; Indah, Indah; Tania, Alinda
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.30

Abstract

This study was conducted to see the effect of growth and antioxidant activity of microalgae Oocystis sp before and after adding NaOCl to Growmore medium combined with urea. Antioxidant activity test was conducted by calculating IC50 spectrophotometrically with the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. Oocystis sp extract was obtained by sonication and maceration process with methanol solvent. The results showed the best growth curve for the growth of microalgae Oocystis sp in a mixture of Growmore medium 0.02% b/v and Urea 0.002% b/v. These results also showed a decrease in Oocystis sp growth in a mixture of Growmore medium 0.02% b/v and Urea 0.002% b/v with the lowest growth decrease in the addition of NaOCl with a concentration of 0.01%. The IC50 value of Oocystis sp extract in methanol solvent has high antioxidant activity in Growmore 0.02% b/v + Urea 0.002% b/v medium, which is 55.5862 mg/L. It can be concluded that NaOCl affects the growth and antioxidant activity of microalgae Oocystis sp, but at certain concentrations NaOCl experienced a negative effect.Keywords: Microalgae, Oocytis sp, Oxidative Stress, Growth, Antioxidant
Thermogravimetric Analysis of EFB and Palm Shells as Gasification Fuels: Kinetic and Activation Energy Study Komala, Ria; Rohendi, Dedi; Gulo, Fakhili; Faizal, Muhammad
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.37

Abstract

Solid waste from palm oil industry such as EFB and palm kernel shells pose environmental challenges if not properly managed. This study investigated the thermal characteristics and decomposition kinetics of EFB and palm kernel shells through proximate analysis and thermogravimetric analysis (TGA). The results indicate that palm kernel shells have a greater fixed carbon content (21.03–21.35%) than does EFB (19.60–20.06%), whereas EFB has a greater ash content (4.74–5.38%) than does palm kernel shells (1.25–1.31%). EFB showed a weight loss of 94.67% after 233.33 minutes of heating, whereas it was 99% for the palm kernel shells. The peak temperatures reached were 936.67 °C for the EFB and 930 °C for the palm kernel shells. At 600°C, EFB produced more syngas than palm kernel shells did. The calculated activation energies were 4482.19 J/mol for EFB and 4484.97 J/mol for palm kernel shells. This research enhances the understanding of the gasification efficiency of these materials, aiding in the optimization of eco-friendly energy production.Keywords: Empty fruit bunches, palm kernel shells, activation energy, thermogravimetric analysis, gasification
Synthesis and Characterization of Terephthalic Acid MOF as a Catalyst for Biodiesel Production from Waste Cooking Oil Haryana, Rista; Hidayati, Nurlisa; Hasanudin, Hasanudin
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Utilization of waste cooking oil as a raw material for biodiesel production is an effective solution to reduce environmental pollution and produce renewable energy. The high free fatty acid content in waste cooking oil is a major problem in the industry, so it requires an effective catalyst in the biodiesel production process. Zn terephthalate MOF has a large surface area, porous structure, and good thermal stability, making it very effective as a heterogeneous catalyst for the biodiesel esterification process. This study aims to synthesize and characterize Zn terephthalate MOF using a hydrothermal method with a Teflon autoclave, and evaluate its effectiveness as a catalyst. The analysis was carried out by testing the acidity of the Zn terephthalate MOF catalyst characterized by XRD, TGA, PSA, and the ability to convert waste cooking oil into biodiesel. The results showed that the obtained MOF-5 had an acidity of 4.33 mmol/g, the XRD results showed a 2 theta angle and the catalyst intensity was the same as JCPDS no. 96-432-6738. TGA results showed that the Zn terephthalate catalyst had thermal stability up to 300OC, and PSA results showed particles distributed at 8428.62 nm. This proves that the Zn terephthalate MOF catalyst can reduce the FFA value of waste cooking oil and convert it into biodiesel with a conversion rate of 94.18%, and the catalyst can be reused up to five times with relatively stable performance
Optimization of the cultural conditions to enhance lipase production by environmental bacteria Hameed, Zainab Qais; Alyousif, Nassir Abdullah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

The production of lipase enzymes has played an essential role in biotechnology since they are used in various environmental applications, including oil pollution treatment. The present study aims to increase the production of lipase enzymes by optimizing nutritional and environmental factors from bacteria isolated from the soil and water from different sites in Basrah province. Seven bacterial isolates out of the fifty that showed positive results in the primary screening exhibited the highest activity in the secondary screening. These isolates belong to the species including Bacillus subtilis strain QD517, Bacillus velezensis strain Bac104, Bacillus subtilis strain PK9, Bacillus cereus strain RB1, Enterobacter cloacae strain YY-2, Bacillus subtilis strain SPA N1, and Bacillus velezensis strain FJ23. The values of lipase enzyme activities of the seven isolates under normal cultivation conditions were 49 U/ml, 28 U/ml, 24 U/ml, 23 U/ml, 23 U/ml, 18 U/ml, and 18 U/ml, respectively. Nutritional and environmental factors including carbon sources, nitrogen sources, phosphorus sources, temperature, pH, and incubation period were examined in this study to increase lipase enzyme activity.  The optimal environmental and nutritional conditions were 37 °C, a pH of 7, sunflower oil as the best carbon source, peptone as the best nitrogen source, NH₄H₂PO₄ as the best phosphorus supply and four days as the optimum period of incubation. The maximum lipase activity values for the seven bacterial isolates under optimal conditions were 89 U/ml, 91 U/ml, 86 U/ml, 92 U/ml, 88 U/ml, 88 U/ml, and 89 U/ml, respectively for the bacterial isolates of Bacillus velezensis strain Bac104, Bacillus subtilis strain PK9, Bacillus cereus strain RB1, Bacillus subtilis strain QD517, Bacillus subtilis strain SPA N1, Bacillus velezensis strain FJ23, and Enterobacter cloacae strain YY-2.
Review of Carbon Capture Technology and Its Potential Application to Reduce Emissions In Heavy Equipment Exhausts Putri, Mutiara; Aisyah, Nyayu; Sugiyanto, Sugiyanto; Trisnaliani, Lety
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Carbon emissions from diesel engines, particularly those from heavy equipment, are a significant greenhouse gas emitter in industries such as construction, mining, and logistics. As global efforts toward decarbonization intensify, carbon capture technologies offer a solution to reduce global emissions. This paper conducts a literature review to explore current carbon capture technologies—including chemical sequestration, physical sequestration, and membrane separation—and evaluates their potential for integration with heavy equipment exhaust systems. Key considerations include system size, energy requirements, maintenance, and operational compatibility. Integration of exhaust heat recovery systems is also assessed as a complementary solution to address the high energy demands of carbon capture in the environment. Technical, economic, and regulatory challenges are discussed, along with potential innovations and use cases that could support future deployments. The findings indicate that although carbon capture is still in its infancy, targeted applications and modular designs supported by policy incentives could enable practical implementation in the near future. This review provides a foundation for future research, pilot projects, and system designs aimed at enabling sustainable operation of heavy equipment
The Influence of Hydrogen Flow Rate and Humidifier Temperature on Performance of a PEMFC with Ti-Co/C Catalyst Adhiyanti, Nurmalina; Rohendi, Dedi; Utama, Muhammad Prima; Syarif, Nirwan; Rachmat, Addy; Yulianti, Dwi Hawa; Normah, Normah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

This study explores the effect of hydrogen flow rate and humidifier temperature on the performance of the Membrane Electrode Assembly (MEA) using Ti-Co/C catalyst at the cathode and Pt/C at the anode in a single-cell Proton Exchange Membrane Fuel Cell (PEMFC). MEAs were fabricated by the spraying method and characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to determine their electrochemical surface area (ECSA) and conductivity. The results showed that the optimized ECSA value reached 8.38 cm2/g, and the electrical conductivity was 3.76 × 10-8 S/cm. The best performance was achieved at a hydrogen flow rate of 100 mL/min and room temperature humidification. Under the hydrogen flow rate test, the maximum power density reached 0.364 mW/cm2, while in the humidifier temperature variation, a maximum power density of 0.375 mW/cm2  was obtained at a current density 2.4 mA/cm2. These findings suggest that Ti-Co/C is a promising low-cost catalyst alternative to Pt and that operational conditions play a critical role in MEA performance

Page 18 of 20 | Total Record : 196

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