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All Journal Jurnal Ilmu Pertanian Indonesia ComEngApp : Computer Engineering and Applications Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI The Journal of Pure and Applied Chemistry Research Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Chimica et Natura Acta Indonesian Journal of Chemistry Herb-Medicine Journal Chemistry Indonesian Journal of Chemical Research Jurnal Jamu Indonesia Jurnal Pengabdian Kepada Masyarakat Abdi Putra Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Indonesian Journal of Jamu
Rudi Heryanto
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, IPB University, Jl. Tanjung Kampus IPB Dramaga, Bogor 16680, Indonesia; Advanced Research Laboratory, Institute Of Research And Community Services, IPB University, Jl. Palem Kampus
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Engineering Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Public Health Other

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Journal : JURNAL KIMIA SAINS DAN APLIKASI

 1 
Metabolite Profiling of Java Turmeric (Curcuma xanthoriza) Essential Oil with Different Harvest Times Mohamad Rafi; Dewi Anggraini Septaningsih; Rudi Heryanto
Jurnal Kimia Sains dan Aplikasi Vol 21, No 4 (2018): volume 21 Issue 4 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2511.972 KB) | DOI: 10.14710/jksa.21.4.237-241

Abstract

Java turmeric (Curcuma xanthoriza) is one of the native plants from Indonesia. Java turmeric is known as a medicinal plant with a high content of volatile oils. In this study, we investigated the chemical profile of java turmeric essential oil obtained by hydrodistillation associated with different harvesting times of the rhizome (7, 9, and 11 months). The constituent of the essential oil was determined by using gas chromatography-mass spectrometer. About 19, 20 and 34 compounds were identified in 7, 9, and 11-month old java turmeric. Fifteen compounds were found in all samples namely β-elemene, zingiberene, γ-elemene, β-farnesene, α-curcumene, benzofuran, α-cedrene, epicurzerenone, ar-curcumene, germacrone, aromadendrene, α–longipene, trans-caryophilene, curcuphenol, and xanthorrhizol. This study showed the level of all compound detected in 7, 9, and 11 months old of java turmeric is different.
Uric Acid Sensor Based on PEDOT:PSS Modified Screen-Printed Carbon Electrode Fabricated with a Simple Painting Technique Wulan Tri Wahyuni; Rudi Heryanto; Eti Rohaeti; Achmad Fauzi; Budi Riza Putra
Jurnal Kimia Sains dan Aplikasi Vol 24, No 2 (2021): Volume 24 Issue 2 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3442.057 KB) | DOI: 10.14710/jksa.24.2.43-50

Abstract

A screen-printed carbon electrode is a suitable electrode for electrochemical sensors due to its simplicity and portability. This study aimed to fabricate a screen-printed carbon electrode modified with poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (SPCE-PEDOT:PSS) to improve the electrochemical performance for uric acid detection. The SPCE was fabricated using a layer-by-layer painting process of conductive ink consisting of graphite as a conductive material, polystyrene as a polymeric binder, and dichloromethane solvent on a polyvinyl chloride paper substrate. The fabricated SPCE was then modified with PEDOT:PSS by a drop-casting method. The characterization of SPCE-PEDOT:PSS surface morphology was performed using the scanning electron microscopy technique. The SPCE-PEDOT:PSS provided an acceptable linearity (R2 = 0.9985, 0.9993, 0.9985), sensitivity (0.070, 0.015, 0.024 µA/µM), precision (%RSD = 2.70%, 2.89%, 2.40%), limit of detection (1.61 µM, 1.14 µM, 1.62 µM), and limit of quantitation (5.37 µM, 3.81 µM to 5.39 µM) in measurement of uric acid standard solution using cyclic voltammetry, amperometry, and differential pulse voltammetry techniques, respectively. The studies using SPCE-PEDOT:PSS indicated that the electrode could be applied in the electrochemical measurement of uric acid in the human urine sample.
Pembuatan Recycle Screen Printed Carbon Electrode dan Aplikasinya untuk Deteksi Asam Galat dengan Teknik Voltammetri Wulan Tri Wahyuni; Rany Zalvianita; Rudi Heryanto
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3056.934 KB) | DOI: 10.14710/jksa.22.5.164-172

Abstract

Gallic acid is phenolic compound found in tea and act as antiradical agent. This compound is electrochemically active and could be detected using voltammetric technique. This study aims to obtain recycle screen printed carbon electrode (rSPCE) and applied it for voltammetric detection of gallic acid. rSPCE was prepared by modification of used SPCE working electrode using a mixture of graphite:polystyrene at ratio of 95:5, 90:10, and 85:15 (w/w). Graphite:polystyrene was suspended in chloroform and deposited on SPCE by drop casting method. Phosphate buffer 0.1 M at pH of 2.5, 3.5, and 7 were used as electrolyte solution in voltammetric detection of gallic acid. The optimum condition of gallic acid detection was obtained when phosphate buffer 0,1 M at pH of 2.5 and rSPCE in composition of graphite:polystyrene (95:5) used as electrolyte and working electrode, respectively. Gallic acid has 2 oxidation peaks at potential of 0.26 V and 0.63 V vs Ag/AgCl, respectively. At concentration of 1 – 5 mM, gallic acid and oxidation currents provide linear regression with the coefficient determination of 0.9947 and 0.9864, consecutively for peak number 1 and 2. Measurement of gallic acid at rSPCE 95:5 shows good precision with %RSD < 5%. rSPCE was successfully applied for voltammetric detection of gallic acid in standard solution with accuracy > 96%, however further development is needed before its application for gallic acid measurement in real sample such as tea extract.
Co-Authors Aan Setiawati Achmad Fauzi Achmad Fauzi Amalia Yunita Aninda, Dea Aryo Tedjo Azizah, Norma Nur Budi Riza Putra Budi Riza Putra Cecep Abdurohman Putra Debby Rahmawaty Derry Permana Dewa Saepurrahman Dimas Noor Dudih Gustian Dyah Iswantini Elsa Ramadanti Ervizal AMZU Eti Rohaeti Eti Rohaeti Fadilah Fadilah Fadilah Fadilah, Fadilah Farit Mochamad Afendi Hafshah, Nurul Hanifullah Habibie Irma Herawati Suparto Jihad Hari Katrin Roosita Latifah K Darusman Latifah Kosim Darusman Latifah Kosim Darusman Latifah Kosim Darusman Latifah Kosim Darusman M. Rafi Mardiana, Eni Masriani . Megasari Putri Mohamad Rafi Mohamad Rafi Mohamad Rafi Muhamad Amar Norma Nur Azizah Novia Rahma Noviyanti, Yuthika Rizqi Nurmaida Nurmaida Pitri, Rosiana Putri, Silvi Agusri Ragil, Ragil Ramadhanti, Desi Rany Zalvianita Rico Sihotang Sailendra, Pingkan Ramadhan Septaningsih, Dewi Anggraini Silvi Agusri Putri Siti Sa’diah Sukowati, Siski Andini SUMINAR SETIATI ACHMADI Usman, Muhammad Syafiuddin Wisnu Ananta Kusuma Wulan Tri Wahyuni Yudi Nata Yuthika Rizqi Noviyanti