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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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A Simple Photometer and Chemometrics Analysis for Quality Control of Sambiloto (Andrographis paniculata) Raw Material Rudi Heryanto; Derry Permana; Aryo Tedjo; Eti Rohaeti; Mohamad Rafi; Latifah Kosim Darusman
The Journal of Pure and Applied Chemistry Research Vol 6, No 3 (2017): Edition of September - December 2017
Publisher : Chemistry Department, The University of Brawijaya

In this paper, we described the use of a light emitting diode (LED)-based photometer and chemometric analysis for quality control of king of bitter or sambiloto (Andrographis paniculata) raw material. The quality of medicinal plants is determined by their chemical composition. The quantities of chemical components in medicinal plants can be assessed using spectroscopic technique. We used an “in house” photometer to generate spectra of sambiloto. The spectra were analyzed by chemometric methods, i.e. principal component analysis (PCA) and partial least square discriminant analysis (PLS-DA), with the aim of herbal quality classification based on the harvesting time. From the results obtained, based on thin layer chromatography analysis, sambiloto with different collection times (1, 2, and 3 months) contained different amounts of active compounds. Evaluation of sambiloto, using its spectra and chemometric analysis has successfully differentiated its quality based on harvesting time. PCA with the first two PC’s (PC-1 = 60% and PC-2 = 35%) was able to differentiate according to the harvesting time of sambiloto. Three models were obtained by PLS-DA and could be used to predict unknown sample of sambiloto according to the harvesting time

Scaling Up of the Pyrolysis Process to Produce Silica from Rice Husk Casnan Casnan; Erliza Noor; Hartrisari Hadjomidjojo; Irzaman Irzaman; Eti Rohaeti
Journal of Engineering and Technological Sciences Vol. 51 No. 6 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.6.1

Rice husk is a potential alternative source of silica and silicon. The mechanism of heating (pyrolysis) for the decomposition of rice husk is an important factor in obtaining silica of high purity. Medium-scale pyrolysis to produce silica from rice husk serves as a bridge to connect laboratory-scale production to industrial-scale production. The purpose of this study was to model and scale up the pyrolysis process as a guidance for industrial-scale production. The research method used was experimentally based. An experimental investigation was undertaken in five stages. 1) Analyzing rice husk mass conversion using thermogravimetry analysis (TGA); 2) pyrolysis modeling based on a laboratory investigation using COMSOL Multiphysics version 5.3; 3) medium-scale experiments according to the modeling results; 4) validation of the modeling results by carrying out a medium-scale experiment; 5) silica purity analysis using SEM-EDX. The medium-scale pyrolysis simulation of silica manufacture from rice husk obtained a heating rate of 1.5 °C/min. There was an increase in the heating rate of 1 °C/min when compared to the laboratory-scale process. The pyrolysis of rice husk for the production of silica affects the mass conversion and selectivity of the resulting silica product. The mass conversion produced was 13.33% to 17.87% and the purity of silica produced was 63.99% to 82.74%.

Sintesis Dan Karakterisasi Natrium Silikat (Na2SiO3) Dari Sekam Padi Linda Trivana; Sri Sugiarti; Eti Rohaeti
Jurnal Sains & Teknologi Lingkungan Vol. 7 No. 2 (2015): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol7.iss2.art1

Abu sekam padi umumnya mengandung silika (SiO2) sebesar 86,90-97,30% dan sejumlah kecil alkali dan logam pengotor. Kandungan silika yang tinggi pada abu sekam padi dapat digunakan sebagai alternatif sumber silika yang potensial dalam sintesis natrium silikat. Natrium silikat murni disintesis melalui dua tahap, yaitu isolasi silika dari sekam padi dan sintesis natrium silikat. Isolasi silika terdiri atas proses pengarangan, pengabuan arang sekam pada suhu 600°C, selama 2 jam dan pemurnian silika dengan HCl 3%. Natrium silikat disintesis dengan cara destruksi dengan NaOH yang diikuti dengan peleburan. Natrium silikat yang diperoleh akan dikarakterisasi dengan teknik FTIR untuk analisis gugus fungsional dan EDS untuk analisis komposisi serta kadar unsur yang terkandung dalam sampel. Analisa FTIR sampel natrium silikat membuktikan terjadinya pembentukan SiO2. Pola serapan silika yang muncul umumnya adalah gugus silanol (≡Si-OH) dan siloksan (≡Si-O-Si≡). Pita serapan di 2800-3750 cm-1 menunjukkan gugus –OH silanol dan H2O yang diserap. Bilangan gelombang 682,8 cm-1 menunjukkan ikatan Si-O-Si dan vibrasi ulur Si-O pada silanol (≡Si-OH) pada bilangan gelombang 972,12 cm-1. Hasil EDS menunjukkan bahwa unsur-unsur yang terdapat dalam natrium silikat sintetis, yaitu oksigen 71,89%, natrium 22,63%, dan silikon 5,39%.

Evaluasi Pemberian Unsur Hara Besi pada Kandungan Asam Amino dan Mineral dalam Biji Jagung Deden Saprudin; Citra Ajeng Palupi; Eti Rohaeti
Jurnal Kimia Riset Vol. 4 No. 1 (2019): Juni
Publisher : Universitas Airlangga

Evaluasi pemberian pupuk nanomagnetit (Fe3O4) 25 ppm dan pupuk komersial Fe-kelat 250 ppm terhadap kandungan nutrisi dalam biji jagung seperti kandungan proksimat, asam amino, serta mineral telah dilakukan. Asam amino ditentukan menggunakan kromatografi cair kinerja tinggi (KCKT) dan mineral ditentukan menggunakan spektrofotometri serapan atom (SSA). Pengolahan data melalui uji anova satu arah untuk membandingkan kedua jenis perlakuan. Perlakuan Fe-kelat 250 ppm dapat meningkatkan kandungan total asam amino 32% dan total mineral 86%. Begitupun perlakuan nanomagnetit 25 ppm juga terbukti meningkatkan kandungan total asam amino sebesar 18% dan total mineral 29% pada biji jagung secara signifikan jika dibandingkan dengan kontrol berdasarkan uji anova.

KARAKTERISTIK KARBON AKTIF DARI KULIT BUAH MALAPARI (Pongamia pinnata L. Pierre) Ibrahim Ibrahim; Djeni Hendra; Nur Adi Saputra; Eti Rohaeti
Jurnal Penelitian Hasil Hutan Vol 40, No 1 (2022): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2022.40.1.1-6

Pengolahan minyak nabati buah malapari (Pongamia pinnata L. Pierre) menyisakan limbah kulit buah yang belum dimanfaatkan. Salah satu pemanfaatan kulit buah malapari adalah bahan baku karbon aktif. Penelitian ini bertujuan untuk memanfaatkan limbah kulit buah malapari sebagai bahan baku arang aktif yang menggunakan cara kimia dan fisika. Kondisi optimum pembuatan arang aktif dihasilkan dari bahan baku yang dikarbonisasi pada suhu 400°C, diaktivasi dengan asam fosfat 2% dan pemanasan pada suhu 750°C sambil dialiri uap air selama 60 menit. Proses tersebut merupakan kondisi optimum yang menghasilkan rendemen arang aktif sebesar 54%, kadar air 8,6%, zat terbang 11,85%, abu 24,73%, karbon terikat 63,42%, daya jerap benzena 10,15%, daya jerap biru metilena 93,89 mg/g, dan daya jerap iod 648,62 mg/g serta luas permukaan spesifik 348,11 m2/g. Arang aktif studi ini masih di bawah standar Indonesia, yang dipengaruhi oleh waktu retensi aktivasi yang belum optimal.

PENJERAPAN KROM LIMBAH CAIR PROSES PENYAMAKAN KULIT OLEH ZEOLIT ALAM Eti Rohaeti
Purifikasi Vol 7 No 1 (2006): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Chromium removal and recovery carried out by using precipitation process was reported to become costly at lower cation concentration. Therefore, the use of natural zeolit, as one of mineral abundance in Indonesia, becomes an important ion exchanger and adsorbent for this cation at low concentration. In this research, chromium’s tanning wastewater was first reacted with a precipitating agent, sodium hydroxide 1,5 M. The remaining, chromium in the filtrate, was passed through columns packed with zeolit . Tanning wastewaters are originated from two tanneries, namely Gunung Putri and Citeureup in Kabupaten Bogor. The zeolite used is originated from Cikalong, Cikembar and Lampung. The first two are mordenite type with purity grade 79% and 84% respectively. The zeolite originated from Lampung was clinoptilolite type with 94% purity grade. The capacity of cation exchange of Cikalong zeolite, Lampung and Cikembar were 94,14, 89,62 and 79,70 respectively. The capacity of chromium adsorption of Cikalong zeolit, Lampung and Cikembar under chromium synthetic solution with batch operation were 1710, 1629 and 1150 mg/kg respectively. The capacity of chromium adsorption of Cikalong zeolit Lampung, and Cikembar under chromium synthetic solution with fixed-bed operation were 1350, 1507 and 399 mg/kg respectively. Under spent tanning solution with fixed-bad method the capacity of chromium adsorption of these three zeolit were 82, 160, and 82 mg/kg respectively.

ADSORPSI DAN DESORPSI ION KROMIUM (VI) PADA HDTMA-BENTONIT Eti Rohaeti
Purifikasi Vol 12 No 3 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Bentonite is naturally negatively charged, and therefore has a high adsorption capacity towards cations such as mirrored by the cation exchange capacity (CEC) is high. This study aims to bentonite also has a high adsorption ability of anions of chromium (VI), as Cr2O72-, through activation by using hexadecyltrimethylammonium cation (HDTMA +). Bentonite origin Leuwiliang-Bogor, reacted with HDTMA + with an equivalent number of 25%, 50% and 100% CEC bentonite. HDTMA-bentonite produced and tested its ability to adsorps and desorps Cr (VI) anion. Optimum conditions of adsorption of Cr (VI) by HDTMA-bentonite carried out at pH, contact time and concentration of Cr (VI) are different. The analysis showed that the bentonite CEC Leuwiliang me/100g decreased from 54.3 to about 20.7 to 45.1 g me/100 after activated by HDTMA +. The acidity of bentonite also decreased from 4.95 me / g in natural bentonite to about 0.60 to 3.62 me / g after activated. Optimum conditions of adsorption of Cr (VI) by bentonite and HDTMA-bentonite occurs in the pH range of 2 to 5, the contact time of 3 to 4 hours and the concentration of Cr (VI) 200 to 500 ppm. Activation of bentonite with HDTMA + increases the adsorption capacity of bentonite to Cr (VI) of 4.44 mg / g to 11.96 to 22.09 mg / g. Desorption of Cr (VI) of HDTMA-bentonite by distilled water, 0.1 N HCl and 1 M CaCl 2 was relatively small, ranging from 0.89-4.15%, which indicates that Cr (VI) strongly bound in the HDTMA-bentonite.

Structural and Electrical Properties of Silica Materials from Rice Husks Casnan; Purnawan; Erliza Noor; Hartrisari Hardjomidjojo; Irzaman; Eti Rohaeti; Aditya Kurniawan
ASEAN Journal on Science and Technology for Development Vol. 38 No. 2 (2021): Repurpose & Redefine
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.697

This study aimed to analyze the structural and electrical properties of silica from rice husks recovered by the process of ashing on a medium-scale furnace with a capacity of 15 kg. Rice husks were burned at a heating rate of 1.5°C/min to a temperature of 900°C, where the temperature was retained for 1 hour each at 400°C and 900°C. The methodology of this research was conducted through the process of ashing, extraction of silica, and characterization of its structural electrical properties. The silica extracted from rice husk ash had a relatively low water content by the low absorption intensity of the group –OH at 3610 cm-1. The silica was dominated more by the siloxane group (Si-O-Si) compared with the silanol group (Si-OH). Based on XRD analysis, the silica structure was confirmed as tetragonal. The silica also had a decreased resistance, impedance, and inductance as the frequency increased. These results indicate that the obstacles contained in silica content decrease with an increase in frequency. The decreasing of dielectric constants was caused by the frequency affecting the capacitance; i.e., increased frequency caused more waves to be transmitted each second. The electric current was turned before the capacitor plate was fully charged, which caused quick charge drainage in the capacitor plate and therefore reduced the ability of a material to store the electric charge.

Analisis Sidik Jari Kromatografi Lapis Tipis Rimpang Temu Mangga (Curcuma mangga) Makmum Syafi’i; Eti Rohaeti; Wulan Tri Wahyuni; Mohamad Rafi; Dewi Anggraini Septaningsih
Jurnal Jamu Indonesia Vol. 3 No. 3 (2018): Jurnal Jamu Indonesia
Publisher : Tropical Biopharmaca Research Center, IPB University

Profil sidik jari kromatografi lapis tipis (KLT) dapat dimanfaatkan untuk kendali mutu bahan baku maupun produk tumbuhan obat. Penelitian ini bertujuan mengembangkan metode analisis sidik jari rimpang temu mangga (Curcuma mangga) untuk kendali mutunya. Rimpang kering temu mangga diekstraksi menggunakan metanol dan dianalisis sidik jari KLT. Kloroform:etil asetat (8.5:1.5) merupakan fase gerak optimum yang memisahkan 11 pita dari rimpang temu mangga dengan keterpisahan yang baik dan memiliki pita khas biru tua (Rf 0.36). Demetoksikurkumin terdeteksi pada rimpang temu mangga dengan warna jingga kecoklatan pada UV 366 nm (Rf 0.48) setelah diderivatisasi dengan pereaksi asam sulfat 10%. Pengujian spesifitas terhadap rimpang lain dalam satu genus, rimpang temu mangga menunjukan pola yang berbeda. Validasi metode analisis sidik jari KLT memenuhi kriteria keberterimaan, sehingga metode ini dapat digunakan untuk kendali mutu rimpang temu mangga.

Synthesis of Zeolite and Composite of Zeolite/TiO2 from Kaolin and Its Application to Adsorption-Photodegradation of Methylene Blue Linda Trivana; Sri Sugiarti; Eti Rohaeti
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.722.147-162

In this study, zeolite was synthesized from kaolin which was founded from Bangka Belitung as the starting material. Meanwhile, sodium silicate was used as silica source. Zeolite is material with many benefits, such as become an adsorbent. Kaolin has been used as starting material due to high content of silica and alumina, i.e 35 - 50 %. Zeolite was prepared by hydrothermal synthesis process, by mixing the metakaolin which was produced by calcination of kaolin at 700 °C for 6 hours, with sodium silicate and NaOH. The NaOH was used to activate the major components of Si and Al in the kaolin.The hydrothermal process was conducted at 100 °C for 24 hours with various concentrations of NaOH, i.e 1.5 N and 2.5 N. The NaOH concentration might determine the type of zeolite obtained. To improve the nature as adsorbent, zeolites modified into zeolit/TiO2. The addition of TiO2into the prepared zeolit aimed to produce a material with capability as adsorbent-photocatalyst. The result of research found that the addition of NaOH 1.5 N produced zeolite NaP1. Meanwhile, the addition of NaOH 2.5 N produced the NaP1 zeolite, zeolite X, and faujasite. The composite of zeolit/TiO2has ability on adsorption-photocatalytic as it was proven by methylene blue degradation under ultraviolet light.

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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