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Ajuk Sapar
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University Jl. Prof. Dr. Hadari Nawawi, Pontianak, Kalimantan Barat, Indonesia
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INDONESIA
Indonesian Journal of Pure and Applied Chemistry
Published by Universitas Tanjungpura
ISSN : 26208571     EISSN : 2620858X     DOI : -
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry
Indonesian Journal of Pure and Applied Chemistry (IJoPAC) was first established in 2018 as a scientific journal that accommodates researchers and education practitioners to publish scientific work and research results which are the results of experiments or literature studies in the field of chemistry. Publications are carried out periodically with three issues (January-April, May-August, September-December) in one volume per year. Published scientific work can be in the form of original articles, short communications and review results covering the fields of Physical chemistry, Organic chemistry, Analytical chemistry, Inorganic chemistry, Biochemistry / Biological Chemistry, Applied Chemistry. Focus and Scope of Indonesian Journal of Pure and Applied Chemistry covering the fields : Physical chemistry Organic chemistry Analytical chemistry Inorganic chemistry Biochemistry/Biological Chemistry Applied Chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 140 Documents
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UJI ANTIOKSIDAN DAN KUALITAS ORGANOLEPTIK SEDUHAN TEH Acanthus ilicifolius DAN Rhizophora apiculata Putri, Serina; Prayitno, Dwi Imam; Minsas, Sukal; Idiawati, Nora
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 1 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i1.99955

Abstract

The use of mangrove leaves in functional beverages is increasingly popular due to their bioactive compounds, which have potential as natural antioxidant sources. This study aimed to analyze the antioxidant activity and organoleptic quality of tea infusions prepared from Acanthus ilicifolius and Rhizophora apiculata leaves. Leaf samples were collected from the coastal area of Kubu Raya Regency, vacuum-dried, ground, and prepared as tea infusions. Antioxidant activity was determined using the DPPH method, while organoleptic quality (appearance, aroma, and taste) was evaluated through a hedonic test with 10 panelists. The results revealed that A. ilicifolius tea exhibited higher antioxidant activity, with an IC₅₀ of 9.48 ppm, compared to R. apiculata at 16.36 ppm. Both values fall into the very strong category (IC₅₀
INTERAKSI SENYAWA POTENSIAL TANDAN KOSONG KELAPA SAWIT (TKKS) DENGAN ION LOGAM Pb²⁺: KAJIAN TEORITIK KOMPUTASI Mahmudha, Siti; Nugraha, Fajar; Idris, Muhammad; Pangestika, Inten; Sani, Sulwiyatul Kamariyah
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 1 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i1.100734

Abstract

This study investigates the interactions between potential bioactive compounds in oil palm empty fruit bunches (OPEFB) and Pb²⁺ ions using computational methods. The identification of functional compounds was performed using Fourier Transform Infrared spectroscopy, which confirmed the presence of lignocellulosic components, predominantly lignin and cellulose, as the major constituents of OPEFB biomass. Molecular modeling was then performed using the semi-empirical PM3 method to obtain optimized structural parameters, including bond lengths and bond angles, both before and after interaction with Pb²⁺ ions. The calculated interaction energies for lignocellulose, cellulose monomer, and cellulose dimer complexes with Pb²⁺ were –56.22, –69.90, and –52.09 kcal/mol, respectively. The negative interaction energy values indicate spontaneous complex formation and thermodynamic stability. These results demonstrate that the chemical constituents of OPEFB exhibit strong potential as effective biosorbents for Pb²⁺ ions through molecular-level interactions.
KARAKTERISASI FISIKO-KIMIA SERAT SABUT KELAPA TERAKTIVASI SEBAGAI MATERIAL RINGAN Anugrah, Zhulfadillah; Wahyuni, Nelly; Rudiyansyah, Rudiyansyah
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.100799

Abstract

Coconut fiber is used as a catalyst carrier due to its low density, which allows it to float and maximize the catalyst's performance. Various activation treatments, including organosolv and bleaching, are required to prepare the carrier. Both treated fibers were physicochemically characterized. The physical analysis included tests for moisture content, ash content, density, morphology, and elemental composition using Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), alongside functional group analysis via Fourier Transform-Infra Red (FT-IR). Meanwhile, the chemical analysis determined the contents of hemicellulose, cellulose, and lignin. The density was 0.968 g/cm³ for the untreated fiber, 0.821 g/cm³ for the organosolv-treated fiber, and 0.225 g/cm³ for the bleached fiber. These results indicate that organosolv and bleaching treatments successfully reduce fiber density relative to the untreated sample, as corroborated by other physicochemical findings. Chemical analysis of the untreated, organosolv-treated, and bleached samples revealed hemicellulose contents of 20.149%, 16.396%, and 15.898%; cellulose contents of 42.871%, 47.631%, and 50.769%; and lignin contents of 29.639%, 29.464%, and 7.179%, respectively. Compared with the organosolv treatment, bleaching is the activation method that induces the most significant changes in physicochemical properties.
PENGARUH VARIASI KONSENTRASI KOH TERHADAP SINTESIS SILIKA DARI RED MUD SEBAGAI ADSORBEN ION Fe2+ Nurwanda, Aulya; Zaharah, Titin Anita; Rudiyansyah, Rudiyansyah
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.103166

Abstract

Red mud is alumina industry waste that poses environmental concerns. It has a high silica content, which offers potential for use as an adsorbent. This study aims to investigate the effect of varying KOH concentrations (2.5, 3.0, and 3.5 M) on the particle size of extracted silica and its ability to adsorb Fe2+ ions. Silica was synthesized using the sol-gel method followed by calcination at 500 °C for 2 hours. The Particle Size Analyzer (PSA) revealed that the smallest particle size was observed at 2.5 M KOH, measuring 450.8 nm with a PDI of 2.488. The optimum silica sample was further characterized using X-ray fluorescence (XRF), Gas Sorption Analyzer (GSA), Fourier Transform Infrared (FT-IR), and X-ray diffraction (XRD). XRF analysis showed an increase in SiO2 content from 37.218% to 60.132%. GSA analysis indicated a surface area of 105.772 m2/g, pore volume of 0.367 cc/g, and pore diameter of 6.73 nm, classifying it as a mesoporous material. FT-IR spectra confirmed the presence of silanol and siloxane groups, while XRD diffractogram demonstrated a crystalline silica structure, quartz phase. Adsorption tests on Fe2+ ions showed an average removal efficiency of 75.53% and a distribution coefficient of 0.62 L/g.
ULTRASOUND-ASSISTED EXTRACTION OF INULIN-TYPE CARBOHYDRATES FROM Musa acuminata Antari, Gladeva Yugi; Aini, Diah Miftahul; Malika, Riwayati
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.104278

Abstract

Bananas (Musa acuminata) are a plentiful and underutilized tropical resource that has the potential to serve as an alternative source of inulin-type carbohydrates. The main objective of this study was to assess the effectiveness of ultrasonication in improving the yield and quality of inulin-type carbohydrates extracted from banana biomass. The extracted products are used at 40 kHz and 50 W for 15 min at 70 °C. Then, the samples were characterized using Fourier Transform Infrared (FTIR) spectroscopy and carbohydrate content determination to confirm the presence of inulin-type structures. The results demonstrated that the ultrasonication extraction efficiency was 10.914% and 33.57% for moisture contents of 10.914% and 33.57%, respectively. Spectral analysis confirmed the presence of characteristic functional groups associated with fructan-based carbohydrates, indicating successful extraction. In conclusion, ultrasonic-assisted extraction is a promising technology for the efficient recovery of inulin-type carbohydrates from banana biomass. Prospects include process optimization at pilot scale, integration with microwave-assisted extraction, and evaluation of the functional and prebiotic properties of the extracted inulin for food and biomedical applications.
SINTESIS DAN KARAKTERISASI CARBON DOTS TERDOPING NITROGEN DARI DAUN JAMBU BIJI (Psidium guajava L.) UNTUK DETEKSI FE(III) Dzahaba, Fauza Vita Harira; Alauhdin, M
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.105105

Abstract

This study aimed to synthesize and characterize nitrogen-doped carbon dots (C-dots) derived from guava leaves (Psidium guajava L.) and evaluate their potential as a fluorescent sensor for Fe(III) detection. Nitrogen-doped C-dots were synthesized via pyrolysis at different temperatures using urea as the nitrogen dopant. The synthesized C-dots were characterized for their optical properties, surface functional groups, particle size distribution, and fluorescence under 365 nm UV irradiation. The results confirmed the successful formation of nanoscale C-dots bearing hydroxyl (–OH), carboxyl (–COOH), and amino (–NH) functional groups that contribute to their fluorescence properties. The synthesis temperature significantly affected the optical characteristics and fluorescence intensity of the C-dots, with the sample prepared at 250 °C exhibiting the highest fluorescence intensity and a strong blue emission. Fluorescence sensing experiments demonstrated that Fe(III) induced greater fluorescence quenching than the other tested metal ions, indicating good selectivity toward Fe(III). These findings demonstrate that nitrogen-doped guava leaf-derived C-dots are promising as a simple, environmentally friendly, and cost-effective fluorescent sensors for Fe(III) detection in aqueous samples.
ANALYSIS OF LEAD AND CADMIUM CONTENT IN JERUJU MANGROVE TEA LEAVES (Acanthus ilicifolius L.) WITH DIFFERENT DRYING TIMES Kelibay, Amirula; Sulfiana, Sulfiana; Sukmawati, Sukmawati; Hardianti A, Fatimah; Rumwokas, Muhamad Saleh
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.106646

Abstract

Jeruju mangrove (Acanthus ilicifolius L.) is a coastal plant with potential for development as a herbal tea due to its bioactive compounds. However, its ability to accumulate heavy metals raises concerns regarding food safety. This study aimed to determine the lead (Pb) and cadmium (Cd) contents of jeruju herbal tea subjected to different drying times and to evaluate the effect of drying time on heavy metal levels. The study employed a Completely Randomized Design (CRD) with a single factor, namely drying time at 100 °C, consisting of three treatments (70, 85, and 100 min), with three replicates for each treatment. Pb and Cd contents were determined using Graphite Furnace Atomic Absorption Spectrometry (GFAAS) in accordance with the applicable SNI standards. The Pb content ranged from 3.37 to 4.78 mg/kg, with the highest concentration observed at 85 min and the lowest at 70 min. Analysis of variance showed a significant effect of drying time on Pb content (p < 0.05). In contrast, Cd was not detected in any treatment, indicating that its concentration was below the analytical method's detection limit. The results demonstrate that drying time affected Pb concentrations, whereas no detectable Cd was observed under the conditions investigated. These findings highlight the potential of jeruju leaves as a raw material for herbal tea while emphasizing the need for continued monitoring of Pb contamination to ensure product safety.
ADSORPTION OF METHYLENE BLUE DYE USING HCl-ACTIVATED COAL FLY ASH Setyawan, Teguh; Muharmi, Melvi; Rizal B, Muh; Ardina, Vebria
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.103860

Abstract

Methylene blue (MB) is a synthetic dye widely used in the textile industry. Its discharge into water bodies via untreated textile wastewater can cause environmental pollution and degrade water quality. This study aimed to activate and characterize coal fly ash using HCl (CFA-HCl) and evaluate its potential for MB adsorption. The effects of adsorbent mass, pH, and adsorption time on the adsorption process were investigated. CFA was activated by refluxing in 6 M HCl at 90 °C for 4 h, while MB adsorption was performed by batch at room temperature and atmospheric pressure. Characterization results showed that the main crystalline phases of CFA-HCl were quartz (Q) and mullite (M). FTIR analysis indicated the presence of siloxane (Si–O–Si), silanol (Si–OH), and Si–O–Al groups. The optimum adsorbent mass for MB adsorption was 0.1 g. The optimum adsorption conditions were obtained at pH 9 and an adsorption time of 75 min.
APLIKASI SIMULTAN DARI TEKNOLOGI MICROBIAL FUEL CELL SISTEM SEL GANDA OKSIDATOR K2Cr2O7 DAN KMnO4 UNTUK MENGHASILKAN ENERGI LISTRIK DAN MENURUNKAN KADAR KONTAMINAN DARI AIR LINDI Al Gazali, Muhammad Hijir; Zaeni, Ahmad; Susilowati, Prima Endang
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.104632

Abstract

Research on the simultaneous application of microbial fuel cells (MFCs) for electricity generation and contaminant reduction in leachate has been conducted. A leachate sample collected from the Puuwatu Final Disposal Site was used as the substrate in an MFC system. The investigation included measuring the electrical power generated by the MFC and analyzing contaminant levels in the leachate. The MFC was designed in a dual-chamber configuration with two oxidizing agents, KMnO4 and K2Cr2O7. Six MFC cells were prepared for each treatment and evaluated based on the electrical power generated. During the first 3–5 days of incubation, both MFCs using KMnO4 and K2Cr2O7 showed a significant increase in electrical power. The MFC using KMnO4 reached a maximum electrical power of 556.52 μW on day 4, whereas the MFC using K2Cr2O7 reached a maximum of 385.40 μW on day 5. After 50 days of MFC operation, the leachate showed reductions in COD, BOD, C-organic, N-organic, C/N ratio, and TSS, accompanied by an increase in pH. The removal percentages for COD, BOD, C-organic, and N-organic were 51.7%, 93.1%, 69.5%, and 2.0%, respectively. Comparison with the applicable quality standards indicated that, despite a reduction in contaminant levels after MFC treatment, the leachate still required further treatment to meet the standards.
PENENTUAN PROTEIN KASAR PAKAN KUCING KOMERSIAL MENGGUNAKAN METODE KJELDAHL DAN EVALUASI KESESUAIAN INFORMASI LABEL Alhannawi, Miyadah; Rahmadhani, Zahra Putri; Ruwindya, Yorfan; Purbaningtias, Tri Esti
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.104783

Abstract

Protein is a vital nutrient in cat food, supporting growth, tissue maintenance, and physiological functions. This study aimed to determine nitrogen and crude protein contents in commercial cat foods and evaluate their conformity with label claims using the Kjeldahl method. Three dry cat foods representing economy (A), mid-range (B), and premium (C) categories were analyzed according to AOAC 2011.11 through digestion, distillation, and titration, followed by conversion of total nitrogen to crude protein. The average nitrogen contents (±SD) were 5.2887 ± 0.0021%, 5.2817 ± 0.0021%, and 6.1503 ± 0.0023% for samples A, B, and C, respectively, corresponding to crude protein contents of 33.05 ± 0.01%, 33.02 ± 0.02%, and 38.45 ± 0.01%. All measured values exceeded their respective label claims, with deviations of 3.05%, 3.02%, and 0.45% for samples A, B, and C. One-way ANOVA showed significant differences in protein content among samples (p < 0.05). At the same time, one-sample t-tests indicated significant differences between measured values and label claims (p < 0.05). The low %RSD (<0.05%) demonstrated good analytical precision. Overall, higher-priced cat food showed higher crude protein content, while all products exceeded their labeled protein levels and met minimum protein requirements for adult cats.

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