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Salmahaminati
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Department of ChemistryFaculty of Mathematics and Natural ScienceUniversitas Islam IndonesiaProf. Dr. H. Zanzawi Soejoeti Building, Kampus Terpadu UII Jl. Kaliurang Km.14,5 Sleman, Yogyakarta, 55584
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INDONESIA
IJCR (Indonesian Journal of Chemical Research)
Published by Universitas Islam Indonesia
ISSN : 23549610     EISSN : 26145081     DOI : 10.20885
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology
IJCR is intended to be the journal for publishing articles reporting the results of research on Chemistry field with related topics, as well as with their development through interdisciplinary and multidisciplinary approach. The types of articles published in this journal include research articles, review articles and short communication. This journal covers some topics include: Inorganic Chemistry Physical Chemistry Computational Chemistry Biochemistry Analytical Chemistry Organic Chemistry Food and Medicinal Chemistry Environmental Chemistry Material Chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 132 Documents
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Temperature Effects on Growth and Culture Stability of Chlorella sp. in Laboratory Cultivation Anggraini, Winda Trisna; Santoso, Ruth Suci Wadini; Saputri, Wulandari Prasetya; Prakoso, Nurcahyo Iman; Utami, Maisari; Sasongko, Setyo Yanus; Purwiandono, Gani
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art5

Abstract

The growth behavior of chlorella sp. was evaluated under different temperature conditions to examine how thermal variation influences microalgal biomass production and culture dynamics. Cultivation experiments were conducted at 28, 35, and 40°C under continuous illumination with aeration. Biomass accumulation was monitored through optical density measurements at 680 nm, while physicochemical parameters including pH and total dissolved solids (TDS) were recorded throughout cultivation. Stable biomass accumulation was observed at 28°C, whereas growth became less consistent at 35°C and declined at 40°C, indicating increasing thermal stress at higher temperatures. Variations in pH and TDS during cultivation supported the observed temperature-dependent metabolic response. The analytical workflow used to monitor microalgal growth was further evaluated using the AGREE metric based on the principles of Green Analytical Chemistry. The estimated AGREE score of approximately 0.76 indicates a moderately green analytical procedure. The results highlight the importance of temperature control in maintaining stable microalgal cultivation and demonstrate the potential of integrating environmental performance assessment into microalgal growth studies.
Binder Engineering of Leather Shaving Waste–Based Collagen Composite for Shoe Insole Application: Mechanical–Moisture Trade-Off Analysis Winata, Wahyu Fajar; Nurbalia, Elis; Rahmayani, Elyka; Dewi, Zahra Saadiya; Tiyastuti, Rini
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art6

Abstract

Leather shaving waste (LSW) generated from the tannery industry contains chromium-stabilized collagen fibers that are environmentally persistent and difficult to manage. This study investigates the valorization of LSW into leather board for shoe insole applications through binder system engineering. LSW was neutralized using alkaline treatment and compounded with polyester resin and polyvinyl acetate (PVAc), followed by press molding. Mechanical properties and water absorption were evaluated according to SNI 1294-2009 standards. The results show that binder composition significantly influences interfacial adhesion, mechanical strength, and moisture sensitivity. Formulation F3 exhibited superior tensile and tear strength due to enhanced fiber–matrix bonding, while formulation F4 demonstrated improved water resistance. An Engineering Performance Index (EPI) was introduced to integrate mechanical strength and moisture stability, revealing a clear trade-off between maximum mechanical performance and durability against water absorption. Formulation F6 presented a more balanced mechanical–moisture profile suitable for practical insole applications. These findings confirm that binder engineering governs the structure–property relationship of collagen-based composites and provides a sustainable pathway for circular utilization of tannery solid waste.
Isolasi Katekin dari Teh Hijau (Camellia sinensis) Menoreh Berbasis Gelombang Mikro serta Evaluasi Efektivitas Antibakterinya Marwanto, Ari Tri; Ma'mun, Sholeh; Mukti, Nur Indah Fajar
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art7

Abstract

Green tea (Camellia sinensis) is a rich source of bioactive compounds such as catechins, tannins, caffeine, and flavonoids, with catechins known for their antibacterial activity; however, their extraction yield remains relatively low, necessitating optimization. This study investigated the effects of temperature (40 – 60 °C) and extraction time (3 – 9 minutes) using Microwave-Assisted Extraction (MAE) on catechin yield, as well as the antibacterial activity against Staphylococcus aureus, Streptococcus mutans, and Pseudomonas aeruginosa. A total of 5 g of dried green tea powder was extracted with 50 g of 60% ethanol at a microwave power of 450 W, followed by solvent evaporation and catechin analysis using High Performance Liquid Chromatography (HPLC). The results showed that the yield increased with higher temperature and longer extraction time, reaching a maximum of 4.98% at 60 °C for 9 minutes. The disc diffusion assay revealed the largest inhibition zone against P. aeruginosa (19.67 mm), followed by S. aureus (17.50 mm) and S. mutans (12.50 mm). The Minimum Inhibitory Concentration (MIC) was 3.125% and the Minimum Bactericidal Concentration (MBC) was 6.25% (MBC/MIC ≤ 4), indicating bactericidal activity. These findings confirm that MAE optimization effectively enhances catechin yield while producing extracts with promising potential as natural antibacterial agents.
Photocatalytic and Greenes Analysis of Magnetic Biochar prepared from Banana (Musa acuminata) Peel Waste Tri Rizky, Indah; Nurlaela, Nunung; Kamari, Azlan; Sagadevan, Suresh; Fatimah, Prof. Dr. Is
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art8

Abstract

In this research, magnetic biochar was prepared from Kepok (Musa acuminata) banana peel. The prepared material was developed as photocatalyst for rhodamine B degradation in aqueous solution. The synthesis was performed via impregnation of iron precursor followed by pyrolysis at 600oC for 2h. Characterization of prepared material was performed using XRD, FTIR and VSM. The instrumental analysis revealed the formation of dispersed iron oxide in the carbonaceous structure of the biochar with magnetism of 1.91 emu g⁻¹. The material showed highly photoactive towards Rhodamine-B degradation with an optimum efficiency of 98.85%. Analysis of the greenness of material preparation was measured using GREEnness Metric (AGREE) and it is reported that a score of 0.73, indicating good compliance with the principles of green chemistry. These results prove that banana peel-based magnetic biochar has the potential as an environmentally friendly material for dye wastewater treatment.
Pra Analisis Forensic Microbial Profiling Melalui Isolasi Bakteri Endofit Khas Datura metel L. Husein, Saddam; Virginia, Diva Arsynta; Nofita
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art12

Abstract

This study aimed to isolate and characterize endophytic bacteria from young leaves of Datura metel L. as a preliminary step in forensic microbial profiling. Endophytic bacteria are non-pathogenic microorganisms that inhabit plant tissues and have the potential to produce bioactive compounds. This research employed a laboratory experimental method with a descriptive approach through isolation using Nutrient Agar (NA) medium, followed by purification using repeated streaking and macroscopic observation of colony morphology. Leaf samples were divided into leaf petiole (TD), leaf stem (BD), veined leaf (DT), and veinless leaf (D). The results showed that isolates I-TD and I-DT exhibited colony growth characterized by circular shape, white to yellowish-white color, smooth to slightly mucoid surface, and entire margins. In contrast, isolates I-BD and I-D showed no colony growth. Purification was successfully achieved in isolates I-TD and I-DT, while the others could not be purified. These findings indicate that the distribution of endophytic bacteria in Datura metel leaves is uneven, with leaf petioles and veined leaves having greater potential as sources of endophytic isolates.
Advanced Semiconductor–Biochar Engineering of TiO2/Biochar Photocatalysts for Efficient Tartrazine Dye Degradation: Mechanistic Insights and UV–Vis Spectrophotometric Evaluation Husein, Saddam; Puspita, Anindia; Tutik; Octonariz, Vito Zhafran
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art9

Abstract

This study aimed to evaluate the effectiveness of TiO₂/Biochar photocatalysts for tartrazine dye degradation using UV–Vis spectrophotometric analysis. The experiments were conducted using various catalyst dosages and treatment conditions including UV–Vis irradiation, UV-A irradiation, and dark adsorption. The results showed that the optimum catalyst dosage was 0.5 g with a degradation efficiency of 73%, while UV–Vis irradiation produced the highest degradation activity compared to other treatments. The kinetic study indicated that the degradation process tended to follow pseudo-first-order kinetics. These findings demonstrate that TiO₂/Biochar has strong potential as an effective photocatalyst for tartrazine degradation in wastewater treatment.
Pengaruh Penggunaan Mortar dan Alu Berbahan Porselen pada Preparasi Sampel Pengujian Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX) Sulistya, Ida Ayu Sulistya
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art10

Abstract

Porcelain mortars and pestles are basic sample preparation tools. Scratches on porcelain mortars and pestles cause the erosion of silicon dioxide (SiO2), which is hypothesized to be the source of silicon (Si) contamination during SEM-EDX testing. This study compared unground samples, samples ground with a new mortar, and samples ground with a used laboratory mortar (exhibiting visible scratches). The SEM-EDX elemental ranges for the hydrotalcite samples across the three preparation treatments were C: 5.07%–5.38%, O: 56.54%–60.72%, Zn: 10.99%–13.64%, Mg: 13.80%–14.53%, and Al: 10.36%–10.46%. Meanwhile, the EDX elemental ranges for the sodium chloride samples were Na: 53.31%–54.91% and Cl: 45.09%–46.69%. Notably, silicon (Si) was not detected in any of the preparation treatments for either hydrotalcite or sodium chloride. The absence of detected silicon indicates that the porcelain mortar and pestle do not contribute to silica contamination within the samples.
Characterization of Banana Peel Waste Fermented by Lactobacillus casei and Its Antibacterial Potential Hidayat, Habibi; Muhammad Ilham Linsukma; Romadhonsyah, Fitra; Purwaningsih, Tuti
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art13

Abstract

Humans need energy for various activities, especially economic, household, industrial, business and transportation activities. Most of the world's energy supply comes from fossil fuels which are non-renewable resources. World energy needs are expected to continue to increase, while oil and coal reserves are increasingly depleting. The calculation number of colonies carried out, it was obtained that it was 13,107 CFU/mL. The number of colonies produced shows that there are a large number of lactic acid bacteria present in the sample to produce a certain amount of electrical energy. Macroscopic observation the shape was round, irregular, yellowish white, convex, bacillus form with Gram positive bacteria. The pH tolerance of bacteria when compared with controls, includes pH 4 (not cloudy); 6 (cloudy); 7 (cloudy); 8 (less cloudy) and 10 (less cloudy). The larger the clear zone, the more effective the antibacterial is against certain bacteria. S. typhi has a clear zone of approximately 12 mm, indicating a high level of antibacterial activity against this bacterium. S. epidermidis: The clear zone decreases to about 10 mm, which means its antibacterial activity is lower than that of S. typhi. Meanwhile, K. pneumoniae, S. pyogenes: Both have almost the same clear zone at around 10 mm, which indicates moderate antibacterial activity. S. aureus showed a slight increase in the clear zone around 11 mm, indicating relatively stronger activity against the E. coli had a clear zone of about 10 mm, indicating that the sample had similar antibacterial effects to K. pneumoniae and S. epidermidis. Variation in antibacterial effectiveness of samples against different types of bacteria. This sample is most effective against S. typhi and less effective against S. epidermidis and E. coli. The redox reaction that occurs at each (Zn/Pb; Zn/Cu; Pb/Cu) electrode produces an average voltage for 60 minutes with a measurement variation every 5 minutes of (0.4; 0.8; 0.2 mV). At a wavelength of 3326.67 cm-1 the peak around this area usually indicates the presence of a hydroxyl group (-OH), such as in alcohols or carboxylic acids. It can also indicate amine groups (-NH) on proteins or nitrogen-containing polymers typically found in flavonoids, alkaloids, or phenolic compounds. -OH groups are generally found in compounds with antioxidant activity, such as flavonoids and phenols.
Evaluasi Komprehensif terhadap Pengaruh Pra-perlakuan Alkali Berbantuan Gelombang Mikro Menggunakan Amonia pada Limbah Bonggol Nanas Ningtyas, Vita Putri; Agisriani, Agferofita; Saima Perdani, Meka; Normayulisa Putri, Dwini
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art11

Abstract

This study aims to comprehensively investigate the effect of microwave-assisted alkali pretreatment on delignification and changes in composition, functional groups, morphology, and crystallinity structure of pineapple core waste biomass. Pretreatment was carried out using 0.03 M ammonia solution through microwave heating at 600 W power for 5 minutes. Delignification and composition were determined using biomass compositional analysis method from the National Renewable Energy Laboratory (NREL), functional groups were characterized by Fourier Transform Infrared Spectroscopy (FTIR), surface morphology was characterized using a Scanning Electron Microscope (SEM), and crystallinity was characterized by the X-Ray Diffraction (XRD) method. The results showed that the alkali pretreatment with microwaves was able to reduce the lignin content from 23.443% to 19.71%, increase the hemicellulose content from 39.903% to 45.967%, and maintain the cellulose content at 34.317% from 36.653%. FTIR analysis showed a weakening of the lignin aromatic band and changes in the hydroxyl group. SEM analysis showed visible morphological changes in the biomass structure which was initially dense and regular to become rougher, cracked, and containing cavities. XRD analysis showed a decrease in the crystallinity index which indicates the occurrence of partial disruption of the cellulose crystal structure. Based on overall results, microwaves-assisted alkali pretreatment using ammonia showed effectiveness in influencing the characteristics of pineapple core biomass, especially in the delignification process and changes in biomass structure. Keywords: pineapple core waste, lignocellulose, alkali pretreatment, microwave-assisted, characterization
Analysis of Chromium, Nickel, Zinc, and Manganese in Wastewater Matrices Using ICP-OES at PT Medialab Indonesia Fahrevi, Ganang Adha; Salmahaminati
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art16

Abstract

Industrial wastewater from metal-related industries commonly contains heavy metals such as chromium (Cr), manganese (Mn), nickel (Ni), and zinc (Zn), which pose significant risks to aquatic ecosystems and human health if discharged without adequate treatment. This study aimed to determine total metal concentrations in inlet (untreated) and outlet (treated) wastewater matrices using Inductively Coupled Plasma–Optical Emission Spectroscopy (ICP-OES) at PT Medialab Indonesia, Cikarang Barat, and to evaluate the efficiency of the wastewater treatment process in accordance with Peraturan Menteri Lingkungan Hidup No. 5 Tahun 2014, specifically Appendix 47. Wastewater samples were subjected to acid digestion using HNO₃ and HCl prior to ICP-OES analysis. Quality assurance and quality control (QA/QC) parameters including calibration linearity (R²), percent relative percent difference (%RPD), and percent recovery (%REC) were rigorously evaluated. All calibration curves exhibited excellent linearity with R² values of 0.9996–0.9998. Analytical precision was confirmed with %RPD values ranging from 0.66% to 6.42%, and matrix spike recoveries fell within the acceptable range of 87.91%–98.62%. Total metal concentrations in the inlet were 0.0218 mg/L (Cr), 0.1354 mg/L (Mn), 0.0486 mg/L (Ni), and 0.8233 mg/L (Zn). Following the treatment, removal efficiencies of 84.2% for Cr, 93.7% for Mn, and 87.2% for Zn were achieved. All outlet concentrations complied fully with applicable regulatory limits, confirming that the ICP-OES method supported by rigorous QA/QC procedures is reliable and effective for total metal monitoring in complex industrial wastewater matrices.

Page 13 of 14 | Total Record : 132

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