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All Journal HAYATI Journal of Biosciences Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Industri Pertanian VALENSI BERKALA FISIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Penelitian Hasil Hutan The Journal of Pure and Applied Chemistry Research Journal of Engineering and Technological Sciences Jurnal Sains Dan Teknologi Lingkungan Majalah Obat Tradisional Jurnal Sains & Teknologi Lingkungan Jurnal Kimia Riset Jurnal Hasil Penelitian Industri INDONESIAN JOURNAL OF ESSENTIAL OIL Al-Kimia ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Biosaintifika: Journal of Biology & Biology Education Jurnal Purifikasi Chemistry Indonesian Journal of Chemical Research Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat ASEAN Journal on Science and Technology for Development Jurnal Jamu Indonesia Hisbah: Jurnal Bimbingan Konseling dan Dakwah Islam Jurnal Ilmiah Kebidanan Indonesia (Indonesian Midwifery Scientific Journal) Jurnal Penelitian Hasil Hutan Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Milang Journal of Mathematics and Its Applications Analit: Analytical and Environmental Chemistry LIMNOTEK Indonesian Journal of Jamu Jurnal Penelitian Hasil Hutan MILANG Journal of Mathematics and Its Applications Analit: Analytical And Environmental Chemistry

Eti Rohaeti

Department Of Chemistry, Faculty Of Mathematics And Natural Science, IPB University, Bogor|IPB University|Indonesia;Tropical Biopharmaca Research Center, IPB University,Bogor|IPB University|Indonesia

Author-ID : 2663480

Religion Agriculture, Biological Sciences & Forestry Arts Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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CARBON PASTE ELECTRODE HEXADECYLTRIMETHYLAMMONIUM BROMIDE MODIFIED NATURAL ZEOLITE FOR CHROMIUM(VI) DETECTION Budi Riza Putra; Latifah K Darusman; Eti Rohaeti
Indonesian Journal of Chemistry Vol 13, No 2 (2013)
Publisher : Universitas Gadjah Mada

A simple voltammetric technique for quantification of chromium(VI) is presented in this work. The technique is based on linear sweep voltammetric reduction Cr(VI) on hexadecyltrimethylammonium bromide (HDTMABr) modified Lampung zeolite carbon paste electrode. Selected HDTMABr concentration for natural zeolite modification is obtained 200 mM. Working electrode for chromium(VI) detection is made by graphite, paraffin oil and HDTMABr modified Lampung zeolite. The effect of supporting electrolyte matrix, pH and also scan rate is also investigated. The calibration curve for chromium(VI) detection using the proposed method shows linearity from 0.2 to 1.0 mM with sensitivity, detection and quantification limit, and precision was 0.4294 mM, 3.63 x 10-4 mM, 1.197 x 10-3 mM, 4.49%, respectively.

Differentiation of Curcuma longa, Curcuma xanthorrhiza and Zingiber cassumunar by Thin Layer Chromatography Fingerprint Analysis Mohamad Rafi; Eti Rohaeti; Ali Miftahudin; Latifah K. Darusman
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Turmeric (Curcuma longa), java turmeric (Curcuma xanthorrhiza) and cassumunar ginger (Zingiber cassumunar) are widely used in traditional Indonesian medicine. These three herbs have relatively similar rhizomes colour so it is difficult to be differentiated especially if they are in powder form. A rapid and reliable method, thin layer chromatography (TLC) fingerprint, has been developed in order to identify, authenticate and differentiate these three herbs through fingerprint profile of chemical compounds. TLC fingerprints of the three herbs were obtained by visualization of separate zones with visible and UV (254 and 366 nm) light. The TLC fingerprint pattern is different each other and showed a specific marker zones respectively. Therefore, TLC fingerprint can be utilized for identification, authentication and differentiation method in quality control of the three herbs tested.

Optical Sensor for the Determination of Lead(II) Based On Immobilization of Dithizone onto Chitosan-Silica Membrane Yuspian Nur; Eti Rohaeti; Latifah Kosim Darusman
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

Optical sensor based on incorporation of dithizone and chitosan-silica for the determination of lead (II) ion has been conducted. The optical sensor was made by composite of chitosan and silica in the ratio 2:1. Sol gel technique was chosen to make the membrane because it has some advantages such as its low temperature and chemical reactivity. The sensor has a good selectivity at pH 5 with response times at ± 180 s. Linearity responses was obtained with concentration range from 0.2 to 1.1 ppm with r2 = 0.9921. Average of %RSD on precision and accuracy (%PK) test were 1.46 and 100.96%, respectively. Limit of detection (LOD) and limit of quantification (LOQ) were 0.11 ppm and 0.37 ppm, respectively

Fast Analytical Method for Authentication of Chili Powder from Synthetic Dyes Using UV-Vis Spectroscopy in Combination with Chemometrics Eti Rohaeti; Khoirotul Muzayanah; Dewi Anggraeni Septaningsih; Mohamad Rafi
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Chili is widely used in many food products, especially in Indonesia food. Sometimes a synthetic dye, i.e., rhodamine B or red textile dye were found in commercial chili powder. A fast, precise and accurate analytical method is necessary to authenticate chili powders from the two synthetics dye as they can cause a health problem. A combination of UV-Vis spectroscopy and chemometrics (multivariate analysis) were used in this study to detect rhodamine B and red textile dye present in chili powder samples. Authentication of chili powder from the two dyes by principal component analysis (PCA) with absorbance data from the UV-Vis spectra of samples was not able to classify all of the samples into each group (pure and adulterated chili powder). Fortunately, by using principal component analysis-discriminant analysis (PCA-DA), approximately 89 and 86% of chili samples mixed with rhodamine B and commercial red textile dye were successfully classified into their corresponding group respectively. The combination of UV-Vis spectroscopy with PCA-DA could be used for fast authentication of chili powder from rhodamine B and textile dye used in this study.

FTIR-based Fingerprinting and Chemometrics for Rapid Investigation of Antioxidant Activity from Syzygium polyanthum Extracts Eti Rohaeti; Fadila Karunina; Mohamad Rafi
Indonesian Journal of Chemistry Vol 21, No 1 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.54577

Syzygium polyanthum, known as salam in Indonesia, which is rich in phenolics compounds with high antioxidant activity. In this study, we performed the determination of total phenolics and characterization of the antioxidant activity of S. polyanthum leaves extracts using the FTIR-based fingerprinting technique. The extracts of S. polyanthum in water, ethanol, and ethanol-water (30, 50, and 70%) were measured for their antioxidant activity, total phenolics, and FTIR spectra. The antioxidant activity of S. polyanthum extract with different solvent extraction showed the highest antioxidant activity and total phenolic content is 70% and 50% ethanolic extract, respectively. The FTIR spectrum of each extract showed identical FTIR spectra patterns. According to their different solvent extraction, S. polyanthum extract could be grouped based on FTIR spectra using principal component analysis. Correlation between the functional group in the FTIR spectra with IC50 from S. polyanthum extract was analyzed using partial least square (PLS). The PLS analysis results showed that O–H, C–H sp3, C=O, C=C, C-O, and C–H aromatic are the main functional groups contributed to the antioxidant activity of S. polyanthum extract. FTIR-based fingerprinting combined with chemometrics could be used to classify different extracts of S. polyanthum and predicted functional groups having a significant contribution to antioxidant activity.

Data Fusion of UV-Vis and FTIR Spectra Combined with Principal Component Analysis for Distinguishing of Andrographis paniculata Extracts Based on Cultivation Ages and Solvent Extraction Antonio Kautsar; Wulan Tri Wahyuni; Utami Dyah Syafitri; Syifa Muflihah; Nursifa Mawadah; Eti Rohaeti; Zulhan Arif; Bambang Prajogo; Muhammad Bachri Amran; Abdul Rohman; Mohamad Rafi
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.60321

Andrographis paniculata is one of the medicinal plants used for the treatment of antidiabetic. Cultivation ages and solvent extraction affected metabolites' composition and concentration that directly cause the plant's efficacies. This research aimed to distinguish A. paniculata based on cultivation ages and solvent extraction using data fusion of UV-Vis and FTIR spectra combined with principal component analysis (PCA). A. paniculata with 2, 3, and 4 months post-planting were extracted by water, 50% ethanol, 70% ethanol, and ethanol. In each extract, we measured UV-Vis and FTIR spectra. Then, we used the data fusion from both spectra. We used UV-Vis and FTIR absorbance from 200–400 nm and 1800–400 cm–1, respectively. Each extract gives a similar pattern of UV-Vis and FTIR spectra, only differ in their intensities. PCA score plot in two and three-dimensional showed A. paniculata extracts could be distinguished based on cultivation ages and solvent extraction with a total variance of 86 and 92%, respectively. Furthermore, this study confirms the data fusion of UV-Vis and FTIR spectra could distinguished A. paniculata extracts combined with chemometrics based on cultivation ages and solvent extraction.

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

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.

Antibacterial Activity of Jojoba Seed residue and Its Possible Active Compound Irmanida Batubara; Arnold Patogi Siahaan; Eti Rohaeti; Ali Mahmoud Muddathir
Jurnal Kimia Sains dan Aplikasi Vol 25, No 6 (2022): Volume 25 Issue 6 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Jojoba (Simmondsia chinensis) (Link) C.K. is a shrub plant widely used in cosmetics, especially jojoba oil. The residue will remain when producing jojoba oil and become waste. This study aimed to determine the antibacterial activity of Jojoba seed residue (JSR) and its possible active antibacterial compounds. JSR was collected from Sudan and extracted by maceration with n-hexane, ethyl acetate, and 70% ethanol. The antibacterial activity was determined with the microdilution method against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). The 70% ethanol extract showed the value of MIC and MBC against E. coli, which was 7.8 mg/ml; meanwhile, against S. aureus was 3.9 mg/mL and 7.8 mg/mL, respectively. Fractionation of 70% ethanol extract using silica gel column chromatography with gradient elution produced ten fractions. Fraction 3 showed the MIC and MBC values in E. coli which were 3.1 mg/mL and 12 mg/ml, and in S. aureus, which were 3.1 mg/mL and 6.2 mg/mL. The fractionation continued to Fraction 3 using preparative thin layer chromatography to collect subfraction 3.2 at an Rf value of 0.76, actively based on contact autobiography against E. coli and S. aureus. Embelin was detected in Subfraction 3.2 using liquid chromatography-mass spectrometry (UHPLC-Q-Orbitrap HRMS) and suggested as the active antibacterial component in JSR.

BUSINESS MODEL ANALYSIS OF AGRO-INDUSTRIAL DEVELOPMENT OF RICE HUSKS-BASED SILICA BY BUSINESS MODEL CANVAS APPROACH Casnan Casnan; Purnawan Purnawan; Erliza Noor; Hartrisari Hardjomidjojo; Irzaman Irzaman; Eti Rohaeti; Aditya Kurniawan
Jurnal Teknologi Industri Pertanian Vol. 32 No. 2 (2022): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24961/j.tek.ind.pert.2022.32.2.156

Penelitian ini bertujuan untuk mengembangkan bisnis model agroindustri silika dari sekam padi dengan pendekatan Bisnis Model Kanvas. Sekam padi diproses menjadi silika dilakukan melalui proses pembakaran dengan suhu tinggi. Arang sekam padi mengandung sekitar 72,1% silikon oksida dan meningkat menjadi 94,95% setelah dibakar pada 700 oC selama 6 jam, sedangkan abu sekam kering mengandung silikon oksida sekitar 80% - 90%. Arang dan abu sekam padi dapat digunakan sebagai alternatif sumber silika dan silikon. Hasil penelitian ini memiliki prospek untuk mengembangkan agroindustri silika berbasis sekam padi sebagai alternatif bahan baku terbarukan. Metode yang digunakan untuk membangun model bisnis adalah Business Model Canvas (BMC). Business Model Canvas adalah metode visual menggambarkan bagaimana suatu perusahaan membuat dan melakukan bisnis. Visualisasi dengan kanvas lebih komunikatif, hal ini akan mendeskripsikan model bisnis secarasederhana untuk dimengerti. BMC diuraikan dalam sembilan komponen yaitu Customer Segment, CustomerRelationship, Customer Channel, Revenue Stream, Value Proposition, Key Activities, Key Resource, Cost Structure, dan Key Partners. BMC perlu dilakukan sebagai acuan untuk mengisi kanvas model bisnis pengembangan agroindustri silika, tidak hanya berkaitan dengan manfaat atau keuntungan tetapi juga cara organisasi menciptakan, menyampaikan, dan menangkap nilai secara rasional. Silika yang dihasilkan dari proses pirolisis dalam skala medium memiliki kemurnian yang tinggi. Proses produksi silika berbahan dasar sekam padi memiliki potensi yang baik untuk dikembangkan menjadi agroindustri silika sebagai bahan baku alternatif terbarukan.Kata kunci: business model canvas (BMC), rice husks-based silica

PENGGUNAAN METODE HOMOTOPI PADE’ UNTUK MENYELESAIKAN MASALAH LOTKA-VOLTERRA E. ROHAETI; J. JAHARUDDIN; A. KUSNANTO
MILANG Journal of Mathematics and Its Applications Vol. 11 No. 1 (2012): Journal of Mathematics and Its Applications
Publisher : Dept. of Mathematics, IPB University

Model Lotka- Volterra merupakan model interaksi antar spesies mangsa dan spesies pemangsa pada sebuah lingkungan dan dinyatakan dalam bentuk persamaan taklinear. Persamaan Lotka-Volterra diselesaikan dengan metode homotopi Pade'. Metode hemotopi Pade' merupakan pengembangan dari metode homotopi. Dalam hal ini, penyelesaian dengan menggunakan metode homotopi Pade' diperoleh dengan menggunakan penyelesaian dengan menggunakan metode homotopi. Metode homotopi Pade’ lebih cepat mencapai kekonvergenan dibandingkan dengan metode homotopi. Dengan metode homotopi Pade' diberikan suatu interpretasi fisis untuk kasus mangsa lebih banyak dari pemangsa.

Co-Authors A. KUSNANTO Abdul Rohman Achmad Fauzi Achmad Fauzi Ade Heri Mulyati, Ade Heri Aditya Kurniawan Aditya Kurniawan Agustina, Rofiqoh Inayati Aini, Nazwa Aisyah Akhmad Aghzath, Ananjaya Ali Mahmoud Muddathir Ali Mahmoud Muddathir Ali Miftahudin Anak Agung Gede Sugianthara Antonio Kautsar Arinana Arinana Arnold Patogi Siahaan Arnold Patogi Siahaan Aryo Tedjo Asih Gayatri Astrid Novita, Astrid Bambang Prajogo Eko Wardoyo Budi Riza Putra Budi Riza Putra Budi Riza Putra Budi Santoso, Arianto Casnan Casnan Casnan, Casnan Citra Ajeng Palupi Dea Nurafifah Dea Nurafifah Deden Saprudin Derry Permana Dewi Anggraeni Septaningsih Diposani, Diva Putri Djeni Hendra Djeni Hendra Djoko Santoso Dodi Nandika Dudy Imanuddin Effendi Dyah Iswantini Eni Sumarni Erliza Noor Erniati Fadila Karunina Febriani, Elsa Fendy Folkes Laumal Gunawan, Fransisca Hadjomidjojo, Hartrisari Hafshah, Nurul Hartrisari Hadjomidjojo Hartrisari Hardjomidjojo Herry Suhardiyanto Ibrahim Ibrahim Ibrahim Ida Ayu Putu Sri Widnyani Irene, Angelina Irma Isnafia Arief Irmanida Batubara Irzaman, Irzaman Jaharuddin Jaharuddin, Jaharuddin Karomah, Alfi Hudatul Khoirotul Muzayanah KUSNANTO, A. Latifah K Darusman Latifah K Darusman Latifah K. Darusman Latifah K. Darusman Latifah Kosim Darusman Latifah Kosim Darusman Lina Karlinasari Linda Trivana Linda Trivana Linda Trivana, Linda Lucia Dhiantika Witasari, Lucia Dhiantika M. Rafi Madya, Muhammad Miftahul Makmum Syafi’i Manggar Arum Aristri Mardiana, Eni Moh Arif Rohman Nur Hakim Moh Nur Hakim Mohamad Rafi Mohamad Solahudin Muddathir, Ali Mahmoud Muhammad Bachri Amran Munandar, Rafly N. G. Pamungkas Novia Rahma Nur Adi Saputra Nur Adi Saputra Nurdiani Nurdiani, Nurdiani Nurhajawarsi Nurhajawarsi Nursifa Mawadah Purnawan Purnawan Purnawan Purnawan Putri, Silvi Agusri Rachmayanti, Yanti Rahadyanoto Trimulia Rahmawati, Heni Rahmawati, Wahyu Riski Ramadhanti, Desi Reni Febriani Reni Febriani, Reni Rinaldi Idroes Rudi Heryanto Santoso, Arianto Budi Satriah, Lilis - Septaningsih, Dewi Anggraini Shadila Fira Asoka Siahaan, Arnold Patogi Silvia, Riva Siti Aisyah Slamet Widodo Sri Sugiarti Supriyanto Syafi’i, Makmum Syifa Muflihah Tamida Elinda Taopik Ridwan Trisni Untari Dewi Ummu Salma Al Azizah Uswatun Hasanah Utami Dyah Syafitri Wulan Tri Wahyuni Yudiwanti Yuspian Nur Zaenal Abidin

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