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All Journal Acta Aquatica: Aquatic Sciences Journal Agritrop : Jurnal Ilmu-Ilmu Pertanian (Journal of Agricultural Science) Jurnal Segara Jurnal Pengabdian Masyarakat: Darma Bakti Teuku Umar Hikmah Makara Journal of Science Global Komunika : Jurnal Ilmu Sosial dan Ilmu Politik Environmental and Materials Journal of Marine Studies JURNAL PENGABDIAN PEMBANGUNAN PERTANIAN DAN LINGKUNGAN (JP3L) JIKUM: Jurnal Ilmu Komputer
Munawar Khalil
Program Studi Budidaya Perairan, Fakultas Pertanian, Universitas Malikussaleh. Kampus Utama Reuleut Kabupaten Aceh Utara. Aceh.
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry 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 Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Makara Journal of Science

 1 
Hemoglobin-Modified Core–Shell Fe3O4@Au Nanostructures for the Electrochemical Detection of Acrylamide Saepudin, Endang; Yuliani, Tri; Nasution, Mochammad Arfin Fardiansyah; Khalil, Munawar; Hong, Jong Wook; Ivandini, Tribidasari Anggraningrum
Makara Journal of Science Vol. 25, No. 3
Publisher : UI Scholars Hub

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Abstract

In this study, electrochemical detection of acrylamide using hemoglobin (Hb)-modified core–shell Fe3O4@Au nanostructures was conducted. Fe3O4 nanoparticles (~4.9 nm) and core–shell Fe3O4@Au (5.0–6.4 nm) nanostructures were successfully synthesized by the thermal decomposition method. Electrochemical investigation revealed that the optimum amount of Hb of 2 mg/mL could be immobilized in 0.1 M acetate buffer solution (pH = 6). Moreover, the detection of acrylamide using Fe3O4@Au/Hb was evaluated by the cyclic voltammetry technique. A linear calibration curve (R2 = 0.98) in the concentration range of 0.1 to 1.0 µM could be achieved with an estimated limit of detection, limit of quantification, and sensitivity of 0.136 µM, 0.453 µM, and 0.4411 µA/µM, respectively. Furthermore, the developed biosensor exhibited high selectivity in the presence of ascorbic acid, melamine, and caffeine. The developed biosensor was applied to the detection of acrylamide in coffee samples and validated using the standard high-performance liquid chromatography (HPLC) method. The concentration of acrylamide in coffee samples was determined to be 37.450 and 35.377 ppm using electrochemical measurement and HPLC, respectively.
TiO2 Crystallization at Room Temperature and Preparation of Transparent Carbon Counter Electrode for Low-Cost Dye-Sensitized Solar Cells Syauqi, Muhammad Iqbal; Sanjaya, Afiten Rahmin; Madiabu, Mohammad Jihad; Khalil, Munawar; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 27, No. 2
Publisher : UI Scholars Hub

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We developed a low-cost dye-sensitized solar cell (DSSC) using TiO2 fabricated via rapid breakdown anodization (RBA) and ultrafast room-temperature crystallization (URTC). The prepared TiO2 was deposited on a self-made fluorine-doped tin oxide (FTO) conductive glass, and the FTO/TiO2 system was sensitized using curcumin dye. The DSSC was constructed by sandwiching the FTO/TiO2/curcumin electrode with an I−/I2 electrolyte and a transparent carbon counter electrode prepared using a liquid–liquid interface system. The characterization results showed that the TiO2 freshly prepared via URTC was transformed into an anatase crystalline phase, which exhibited a 3.10 eV band gap and a 10.08 nm average crystallite size, comparable to those of the TiO2 prepared via the conventional 450 °C annealing treatment (3.13 eV, 11.60 nm). The photocurrent activity of the URTC-prepared TiO2 under ultraviolet light (0.10 mA/cm2) was also comparable to that of the annealed TiO2 (0.12 mA/cm2). In addition, a transparent carbon electrode (FTO/Ct) was prepared successfully; it exhibited a ±58.26% transparency under visible light and comparable electrocatalytic activity to Pt-coated FTO. The DSSC based on FTO/TiO2-URTC/curcumin and FTO/Ct showed front and back illumination efficiencies of 0.47% and 0.26%, respectively. These results are only slightly lower than those of the conventional DSSC with FTO/annealed TiO2/curcumin//FTO/Pt, which exhibited front and back illumination efficiencies of 0.52% and 0.36%, respectively.
Co-Authors Agussabti Agussabti Andika, Maulana AYU LESTARI A’kla, Cut Meurah Nurul Baehaqi Ceria, Nada Amal Dewi Sri Jayanti Einaga, Yasuaki Endang Saepudin, Endang Erita Hayati Erlangga Erlangga Eva Ayuzar, Eva Fikrinda Fikrinda Habib EY, M. Handayani, Lusia Helmi Yanti, Helmi Hong, Jong Wook Ikhsan, Nur Ilyas Ilyas Indradewa, Rhian Ivandini Tribidasari Anggraningrum Ja'far, Ja'far Jarnuzi Gunlazuardi Juliaviani, Noratun Kafi, Siti Umayyah Khairul Anwar Kukuh Nirmala Lastri, Lastri Lestarini, Dian Tri Madiabu, Mohammad Jihad Mahdalena, Vina Muhammad Nasir Muhammad Yasar Muliani Muliani, Muliani Mulyadi Mulyadi Mustanir Mustanir Nasution, Mochammad Arfin Fardiansyah Nella Tri Agustini, Nella Tri Nurmadani, Sucia Nurwijayanti Pane, Andina Ramadhani Putri Prastika Krisma Jiwanti Raida Agustina Ramadhani, Ita Rasyad, Muhammad Ramzy RIDWAN AFFANDI Rika Anggraini Riri Ezraneti Riski, Muhammad Fariz Rusydi, Rachmawaty Ruzanna, Arina Saifullah Saifullah Sanjaya, Afiten Rahmin Siti Hafsah Subhan Subhan SYAHRIAL SYAHRIAL Syamsiar, Syamsiar Syauqi, Muhammad Iqbal Tri Yuliani, Tri Yessy, Lailan Try Yuliandri, Pratiwi Zainal Abidin Zainura, Zainura Zuraida Zuraida