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All Journal Jurnal Kedokteran Brawijaya Alchemy : Journal of Chemistry Jurnal Ilmu Kimia Universitas Brawijaya Natural B The Journal of Pure and Applied Chemistry Research EduChemia: Jurnal Kimia dan Pendidikan Science and Technology Indonesia Indonesian Journal of Chemistry Jurnal Fish Protech JKPK (Jurnal Kimia dan Pendidikan Kimia) Rengganis Jurnal Pengabdian Masyarakat Jurnal Sains dan Teknologi Makara Journal of Science International Journal of Renewable Energy Development al Kimiya : Jurnal Ilmu Kimia dan Terapan
Akhmad Sabarudin
Laboratory of Analytical Chemistry, Chemistry Department, Brawijaya University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Phosphate Accumulation Using MgO-Fe3O4/Agarose/Oxalic Acid Gel as a Diffusive Gradient in Thin Films (DGT) Binding Layer Dinira, Layta; Rafif, Sullahudin Ahmad; Ulayya, Salwa; Rumhayati, Barlah; Darjito, Darjito; Sabarudin, Akhmad
EduChemia: Jurnal Kimia dan Pendidikan Vol 10, No 1 (2025)
Publisher : Department of Chemistr Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v10i1.29113

Abstract

Monitoring phosphate concentration in waters is critical because excessive phosphate can lead to the death of aquatic organisms. Phosphate can be monitored via a passive sampler called Diffusion Gradient in Thin Films (DGT). This study combines MgO and Fe3O4 impregnated in agarose crosslinked with oxalic acid to accumulate phosphate from the solution as a DGT binding gel. The parameters observed in this study were MgO/Fe3O4 mass ratio (1:3, 1:1, 3:1), accumulation time (20, 40, 60, 120, 240, and 1440 min), phosphate concentration (0.2, 0.4, 0.6, 0.8, and 1 mg/L) and pH (4, 5, 6, 7, and 8) on phosphate accumulation. XRD pattern confirmed that the adsorbents used were MgO and Fe3O4. SEM analysis showed that the gel had an average pore size of 31.78 μm, and the adsorbents were evenly distributed. Gel with MgO/Fe3O4 mass ratio 3:1 can adsorb phosphate up to 97.19 ± 0.36%. The phosphate accumulation reached optimum after a minimum adsorption time of 4 hours and when the phosphate concentration in the solution was 0.4 mg/L. The solution's pH had no significant effect on phosphate accumulation. This study shows that MgO-Fe3O4/agarose/oxalic acid gel is an excellent binding gel to accumulate phosphate from water.
Effect of Ethanol-water Concentration as Extraction Solvent on Antioxidant Activity of Acalypha indica Fadhila, Salma Iza; Hayati, Elok Kamilah; Rafi, Mohamad; Sabarudin, Akhmad
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 10 No. 2 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i2.30081

Abstract

Acalypha indica is an abundant and obtainable wild weed plant in Indonesia. This is a possible opportunity to enhance its utility. The effect of free radicals is one of the factors that contribute to oxidative stress in the body, which can lead to cell damage and trigger various diseases. Plants rich in antioxidants can inhibit free radical reactions and protect the body from oxidative stress. In this study, we conducted the identification of major metabolite compounds using UHPLC-Q-Orbitrap HRMS from 70% ethanol extracts of Acalypha indica. We also performed phytochemical and antioxidant activity tests with various concentrations of ethanol-water solvents including water, 30%, 50%, 70% ethanol, and absolute ethanol to determine the optimal extraction conditions and the influence of solvent concentration on the antioxidant activity of Acalypha indica extract. The results of UHPLC-Q-Orbitrap HRMS identification showed that the 70% ethanol extract of Acalypha indica contains 10 major compounds suspected to correlate with its antioxidant activity. These include five flavonoids compounds (palasitrin, vitexin 2"-o-p-coumarate, isorhamnetin 3- (3",6"-di-p-coumarylglucoside), peucenin, and sulfuretin), two amino acid compounds (2-amino-3-carboxymuconic acid semialdehyde and N-Acetyl-L-phenylalanine), two carboxylic acid compound (citric acid and traumatic acid), and one phenolic compound (quinic acid). Phytochemical tests show positive results for flavonoids, tannins, alkaloids, and triterpenoids in each of water, 30%, 50%, 70% ethanol, and absolute ethanol extracts. The best antioxidant activity was obtained from the 70% ethanol extract with an IC50 value of 47.064 ppm, categorizing it as an extremely strong antioxidant.
Urine Glucose Detection Via Gold Nanoparticle Formation Using 3D-Connector Microfluidic Paper Based Analytical Devices Putri, Krista Firdaus Suwarno; Sulistyarti, Hermin; Sabarudin, Akhmad
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 11 No. 1 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i1.35245

Abstract

A metabolic disorders that have experienced a significant increase in the world are diabetes mellitus. Diabetes is caused by two main factors: the first is damage to pancreatic beta cells, which prevents insulin from being produced, and the second is impaired insulin secretion and function. Chronic diabetes, if not treated properly, can lead to acute complications including eye, kidney, lung, nerve, and even death. Diabetes can be diagnosed through blood and urine. In general, glucose detection is carried out using invasive methods that use blood samples, which can cause pain and discomfort for users. Current research is developing non-invasive glucose detection using urine samples. This research aims to develop non-invasive glucose detection technology using 3D-connector μPADs (Microfluidic Paper Based Analytical Devices) which have the advantages of being safe, easy, and simple. The three-dimensional connector on the device functions as a connector to facilitate the coordination of fluid flow in the sample zone and detection zone. The glucose detection method uses gold (III) chloride as a gold nanoparticle (AuNPs) precursor, an aqueous extract of Acalypha indica Linn as a stabilizing agent, sodium hydroxide (NaOH) as a catalyst, and glucose in artificial urine as a sample. Method validation results using imageJ software indicated linearity with a coefficient of determination value (R2) of 0.9714, precision with a %RSD value (Relative Standard Deviation) of 2.69, and an accuracy level ranging from 92.22-99.23%.
Penyaring Air Keran untuk Pemenuhan Air Bersih di Desa Talangsuko, Kecamatan Turen, Kabupaten Malang Layta Dinira; Mulyasuryani, Ani; Rumhayati, Barlah; Sabarudin, Akhmad
Rengganis Jurnal Pengabdian Masyarakat Vol. 5 No. 2 (2025): November 2025
Publisher : Pendidikan Matematika, FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/rengganis.v5i2.877

Abstract

Desa Talangsuko, Kecamatan Turen, Kabupaten Malang is classified as an area with moderate risk of perilaku hidup bersih dan sehat (PHBS), indicating that PHBS management is not yet optimal. This community service aimed to improve household water management in Desa Talangsuko by implementing filtration and adsorption technology through tap water filters. The activities included water sampling, tap water filter design, education on clean water through counseling and hands-on demonstrations, and installation of tap water filters. The results showed an improvement in household water quality after the use of the tap water filters, as indicated by the reduction of chemical contaminants such as fluoride, nitrate, and water hardness. The counseling and hands-on demonstrations increased community awareness about clean water and the importance of regularly replacing water filter materials. These results suggest that this program demonstrated a positive impact on household water management in Desa Talangsuko.
Modifikasi Elektroda Karbon Screen-Printed dengan Magnetit-Silika-Polimer Cetak Ion untuk Sensor Pb(II) Secara Square Wave Voltammetry (SWV) Nugraha, Hedhi Setya; Mulyasuryani, Ani; Sabarudin, Akhmad; Dinira, Layta; Fardiyah, Qonitah
ALCHEMY:Journal of Chemistry Vol 13, No 2 (2025): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v13i2.36777

Abstract

Elektroda karbon cetak layar (SPCE) telah dimodifikasi dengan Fe₃O₄@SiO₂-ion imprinted polymer (IIP) untuk meningkatkan selektivitas terhadap ion Pb²⁺. Hasil voltametri siklik menunjukkan peningkatan signifikan pada kinetika transfer elektron, dengan koefisien difusi masing-masing 1,79 × 10⁻⁵ cm²/s untuk [Fe(CN)₆]³⁻/⁴⁻ dan 0,0314 cm²/s untuk Pb(II), dibandingkan SPCE tanpa modifikasi (5,76 × 10⁻⁶ cm²/s dan 0,00093 cm²/s). Optimasi parameter square wave voltammetry (SWV) menghasilkan kondisi optimum pada amplitudo 0,01 V dan frekuensi 10 Hz, dengan batas deteksi (LOD) 0,219 ppb serta linearitas sangat baik (Ip = 0,207C; R² = 0,998) pada rentang konsentrasi 1–10 ppb. Temuan ini menunjukkan bahwa SPCE termodifikasi Fe₃O₄@SiO₂-IIP berpotensi sebagai sensor yang selektif dan sensitif untuk deteksi Pb²⁺ dalam aplikasi keamanan pangan dan pemantauan lingkungan.
Optimization and Stability Assessment of Chitosan/PVA Smart Sensor Films Incorporated with Roselle Anthocyanins for Real-Time Visual Monitoring of Chicken and Shrimp Freshness under Different Storage Conditions Hidayaty, Alfianita Nuril; Fiddaroini, Saidun; Fahmi, Ahmad Luthfi; Fardiyah, Qonitah; Sabarudin, Akhmad
Science and Technology Indonesia Vol. 11 No. 1 (2026): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.1.217-234

Abstract

The development of intelligent packaging systems has become a promising approach to ensure food safety and quality by enabling real-time freshness monitoring. In this study, chitosan/polyvinyl alcohol (Cs/PVA)-based smart sensor films incorporated with roselle (Hibiscus sabdariffa L.) anthocyanins were fabricated and optimized for the visual detection of chicken and shrimp spoilage under variations storage. Anthocyanins were extracted from fresh roselle petals through different maceration periods (R1–R5) to investigate their influence on film properties. Physicochemical characterization revealed that extended maceration enhanced anthocyanin loading, leading to increased film thickness, higher color saturation, and improved optical responsiveness. FESEM micrographs demonstrated homogeneous polymer matrices at lower anthocyanin concentrations, while higher loadings induced micro-aggregates that enhanced volatile adsorption and sensing sensitivity. The fabricated films exhibited clear and progressive color transitions aligned with the spoilage process: red–purple at fresh conditions (pH 5–6), brown–green at intermediate spoilage (pH 7–9), and yellow–brown at advanced spoilage (pH ≥10), consistent with anthocyanin structural transformations. Storage trials with chicken and shrimp confirmed that the Cs/PVA–R5 film displayed the intense coloration and strong response to volatile amines such as ammonia, trimethylamine, and dimethylamine, enabling reliable freshness monitoring. Importantly, the films provided a visual indication when the pH exceeded the edibility threshold of 7.0–7.5, beyond which the samples were deemed unsuitable for consumption. Overall, this work demonstrates the potential of Cs/PVA–roselle anthocyanin films as eco-friendly, low-cost, and effective smart indicators for meat and seafood freshness, offering a practical platform for intelligent food packaging applications.
Immobilized L-arginine on methacrylate polymer as reusable heterogeneous catalyst for crude palm oil transesterification Erwanto, Erwanto; Warsito, Warsito; Sabarudin, Akhmad; Mardiana, Diah; Iftitah, Elvina Dhiaul
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61761

Abstract

The development of enviromentally friendly and reusable heterogenous catalyst has attracted significant attention for sustainable biodiesel production from low-cost feedstocks such as crude palm oil (CPO). This study aims to synthesize and evaluate an L-arginine immobilized methacrylate-based porous polymer as an efficient and reusable heterogenous base catalyst for CPO transesterification. In this study, a porous polymer synthesized from glycidyl methacrylate (GM) and ethylene glycol dimethacrylate (EGD), denoted as poly(GM-co-EGD), was employed as a support matrix for L-arginine immobilization to develop an efficient heterogeneous base catalyst for the transesterification of CPO. The catalyst was prepared via free radical polymerization followed by covalent immobilization of L-arginine onto the porous polymer framework. FESEM analysis revealed a well-developed interconnected porous morphology, which was further supported by textural characterization showing a high BET surface area of 650 m² g⁻¹ and a total pore volume of 2.07 cm³ g⁻¹. FTIR spectra confirmed the successful chemical bonding between L-arginine and the polymer matrix. Thermogravimetric analysis indicated good thermal stability of the polymeric catalyst up to 120 °C, suitable for transesterification conditions. The basic strength evaluated using Hammett indicators showed moderate-to-strong basicity (9.9 < H_ < 12), while quantitative back titration with benzoic acid revealed that the catalyst with a poly(GM-co-EGD):L-arginine ratio of 1:2 exhibited the highest total basicity of 1.01 mmol g⁻¹. Process optimization using Response Surface Methodology with a Box–Behnken design produced a highly accurate quadratic model (R² = 0.9992). Under optimal conditions, a biodiesel yield of 82.34 ± 1.08% was achieved, consistent with model predictions. The catalyst maintained stable performance over five consecutive cycles, demonstrating its potential as a green and sustainable catalyst for biodiesel production from CPO.
Co-Authors 'Aisy, Kamila Rohadatul Abdan, Ahmad Multazam Ani Mulyasuryani Arie Srihardyastutie Athiyah, Izzatul Aulanni’am Baiq Octaviana Dwi Anggraeny Barlah Rumhayati Darjito Darjito Diah Mardiana Edi Widjajanto Eka Ratri Noor Wulandari Elok Kamilah Hayati Elvina Dhiaul Iftitah Erwanto Erwin Sulistyo Fadhila, Salma Iza Fahmi, Ahmad Luthfi Fiddaroini, Saidun Hani Susanti, Hani Hermin Sulistyarti Hidayaty, Alfianita Nuril Hikmanita Lisan Nashukha Ibrahim, Moh. Nuh Iftitah, Elvina D. Ika Oktavia Wulandari Ikhsan, Aqshal Nur Kasanah, Izza Lailatul Khanifah, Nurul Layta Dinira Layta Dinira Lukman Hakim M. Rafi Madaniyah, Luailik Moh. Farid Rahman Mohamad Nur Ibrahim Mohamed Abousa Gaza Mufidah Sari, Puspita Nalle, Ferry Chrismiadi Nugraha, Hedhi Setya Nur Permatasari Nur Samsu Okky Anggraito Pratikno, Mochammad Yosi Putri, Krista Firdaus Suwarno Putri, Lani Artana Qonitah Fardiyah Raeni, Septi F. Rafif, Sullahudin Ahmad Rahayu, Lale Budi Hutami Roja’i, Abdul Munir Salsabila, Isadora Evani Santjojo, Djoko Harry Setyawan Purnomo Sakti Silvi Avianti Indriana Ulayya, Salwa Vita Tria Mardila Warsito Warsito Yudha Ikoma Istanti