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All Journal VALENSI BERKALA FISIKA Jurnal Penelitian Hasil Hutan The Journal of Pure and Applied Chemistry Research Journal of Engineering and Technological Sciences Jurnal Sains Dan Teknologi Lingkungan 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 ASEAN Journal on Science and Technology for Development Jurnal Jamu Indonesia Jurnal Penelitian Hasil Hutan Milang Journal of Mathematics and Its Applications Analit: Analytical and Environmental Chemistry

Eti Rohaeti

Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor, Indonesia

Author-ID : 2663480

Agriculture, Biological Sciences & Forestry 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 Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Other

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

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Abu sekam padi umumnya mengandung silika (SiO2) sebesar 86,90-97,30% dan sejumlah kecil alkali dan logampengotor. Kandungan silika yang tinggi pada abu sekam padi dapat digunakan sebagai alternatif sumber silika yangpotensial dalam sintesis natrium silikat. Natrium silikat murni disintesis melalui dua tahap, yaitu isolasi silika darisekam padi dan sintesis natrium silikat. Isolasi silika terdiri atas proses pengarangan, pengabuan arang sekam padasuhu 600Â°C, selama 2 jam dan pemurnian silika dengan HCl 3%. Natrium silikat disintesis dengan cara destruksidengan NaOH yang diikuti dengan peleburan. Natrium silikat yang diperoleh akan dikarakterisasi dengan teknik FTIRuntuk 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 munculumumnya adalah gugus silanol (â¡Si-OH) dan siloksan (â¡Si-O-Siâ¡). Pita serapan di 2800-3750 cm-1 menunjukkangugus âOH silanol dan H2O yang diserap. Bilangan gelombang 682,8 cm-1 menunjukkan ikatan Si-O-Si dan vibrasiulur Si-O pada silanol (â¡Si-OH) pada bilangan gelombang 972,12 cm-1. Hasil EDS menunjukkan bahwa unsur-unsuryang terdapat dalam natrium silikat sintetis, yaitu oksigen 71,89%, natrium 22,63%, dan silikon 5,39%.Kata Kunci : sekam padi, silikat, natrium silika, FTIR, EDX

SINTESIS ADSORBEN ZEOLIT@AuNPs@MET MENGGUNAKAN EKSTRAK DAUN BINAHONG (Anredera cordifolia) SEBAGAI BIOREDUKTOR PREKURSOR Au DAN KARAKTERISASINYA (Synthesis Zeolite@AuNPs@MET Adsorbent by Binahong (Anredera cordifolia) Leaf Extract as Au Precursor Bioreduc Nurdiani, Nurdiani; Darusman, Latifah K.; Rohaeti, Eti
Jurnal Hasil Penelitian Industri Vol 28, No 1 (2015)
Publisher : Baristand Industri Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (23.353 KB)

Modifying zeolite with Au nanoparticles and mercaptoethanol ligand(zeolite@AuNPs@MET) has been developed as an adsorbent of heavy metal ions. The preparation ofzeolite@AuNPs@MET composite material was done in three steps. Firstly, incorporating gold precursorin to zeolite cavity. Secondly, reduction of gold nanoparticles by binahong leaf extract. Thirdly, modifyingzeolite@AuNPs with mercaptoethanol ligand. Binahong was used as bioreductor agent in the synthesis ofAu nanoparticles since it has large contents of flavonoids, saponins, tannins, and steroids which containreducing functional group. The zeolite@AuNPs@MET composite material was characterized by XRD,EDX, PSA, TEM, FTIR and UV Visible Spectrophotometer. EDX measurements showed Au content of0.88%, TEM and PSA measurement showed Au nanoparticle size in the range of 7.12 nm to 14.45 nmwith an average size distribution of 110.6 nm while gold nanoparticles immobilized in the pores ofzeolites have sizes ranging from 4.98 nm to 9.50 nm with an average size distribution of 279 nm. UVVisible absorption spectrum revealed a new formed peak at 537 nm, indicating formation of AuNPs. The characteristic peaks (at 526 nm and 532 nm) were also found in the UV-Vis absorption spectrum ofAuNPs immobilized in the zeolite pores and AuNPs in the zeolite@AuNPs@MET composite, respectively.FTIR measurements of mercaptoethanol ligand showed the presence of a peak at 2550 cm-1 regionindicating SH functional groups, which disappeared after modification of zeolite@Au with MET ligand,indicated the âSH bond was broken and the remained âS was attached to AuNPs. All of thecharacterization revealed the success of the composite material preparation, which is an interestingmaterial expected to have highly potential as a heavy metal ion adsorbent.

Kajian Efisiensi Energi Proses Penyulingan Dan Sifat Fisik Hasil Penyulingan Minyak Serai Dapur Menggunakan Tungku Sekam Dan Heating Mantel Rohaeti, E.; Pamungkas, N. G.; Irzaman, Irzaman
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Essential oil distillation has been carried out from the lemongrass material using two heaters there are rice husk and heating mantel. In comparison ingredients (lemongrass: water = 0.125 kg: 0.5 liters) distillation with rice husk heater requires energy 6022.5 kcal, 3660 second distillation time, costs Rp 912.5 with an average rendemen of oil produced 0.0635 %. Distillation with the same material amount using heating mantel requires the energy 832.143 Kcal, distillation time 6990 seconds, the cost Rp 608.6 and producing the rendemen 0.114%. Distillate debit is influenced by the heat generated which produced by the rice husk and heating mantel. The quality of lemongrass oil which produced by the rice husk heating is better than the heating mantel in term of the lemongrass oil color and oil refractive index. Lemongrass oil which is produced by the pale brown of heating rice husk and refractive index values were in the range of 1.4830 to 1.4890. Keywords: rice husk, heating mantel, distillation, lemongrass oil, energy.

SCALING UP OF THE PYROLYSIS PROCESS TO PRODUCE SILICA FROM RICE HUSK Casnan, Casnan; Noor, Erliza; Hadjomidjojo, Hartrisari; Irzaman, Irzaman; Rohaeti, Eti
Journal of Engineering and Technological Sciences Vol 51, No 6 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

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%.

Antioxidant Activity of Jojoba (Simmondsia chinensis) Seed Residue Extract Siahaan, Arnold Patogi; Rohaeti, Eti; Muddathir, Ali Mahmoud; Batubara, Irmanida
Biosaintifika: Journal of Biology & Biology Education Vol 12, No 3 (2020): December 2020
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v12i3.23323

Jojoba (Simmondsia chinensis (Link)) is a shrub plant that widely used as cosmetic ingredients especially jojoba oil. When making jojoba oil, the residue still reminds and become waste. This study aimed to determine the antioxidant activity of jojoba seed residue (JSR). Jojoba seed residue was collected from Sudan. The JSR extracted by maceration with n-hexane, ethyl acetate, and 70% ethanol solvent. The antioxidant activity was determined using DPPH (2,2-diphenyl-1-picrylhydrazyl) assay. The result showed that 70% ethanol extract of JSR had the highest antioxidant activity with 50% Inhibition Concentration (IC50) value of 219.42 mg/L. The 70% ethanol extract was fractionated by using silica gel column chromatography with gradient elution produced 10 fractions. All fractions showed antioxidant activity (IC50106-447 mg/L). Fraction 3 had the highest antioxidant activity with IC50 value of 106.26 mg/L. Therefore, JSR has a great potential for use as a raw material in cosmetic and pharmaceutical products industry, or as a source of bioactive compounds.

Deteksi Simultan Kuersetin dan Rutin Menggunakan Screen-Printed Carbon Electrode Termodifikasi Grafena Tamida Elinda; Wulan Tri Wahyuni; Eti Rohaeti
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 1, May 2019
Publisher : Syarif Hidayatullah State Islamic University

Kuersetin dan rutin merupakan senyawa antioksidan alami yang termasuk golongan flavonoid. Senyawa ini dapat dideteksi dengan beberapa teknik analisis, salah satunya dengan teknik elektrokimia. Pada penelitian ini, deteksi simultan kuersetin dan rutin dilakukan dengan teknik voltametri siklik menggunakan screen printed carbon electrode (SPCE) termodifikasi grafena. Elektrode disiapkan melalui modifikasi elektrode kerja SPCE dengan campuran grafena:natrium poliakrilat (1:1). Larutan etanol 70%:bufer fosfat pH 7 (6:4) digunakan sebagai elektrolit dalam pengukuran kuersetin dan rutin. Hasil penelitian menunjukkan puncak oksidasi kuersetin dan rutin terdeteksi pada potensial 0.179 V dan 0.310 V vs Ag/AgCl. SPCE termodifikasi grafena menghasilkan intensitas arus oksidasi dan sensitivitas yang lebih tinggi pada pengukuran kuersetin dan rutin. Deteksi simultan kuersetin dan rutin menggunakan SPCE termodifikasi grafena menunjukkan linearitas dengan R2 = 0.9905 dan R2 = 0.9816, masing-masing untuk kuersetin dan rutin. Limit deteksi pengukuran kuersetin dan rutin masing-masing sebesar 0.5369 mM dan 0.7495 mM serta limit kuantitasi sebesar 1.7898 mM dan 2.4985 mM. Presisi pengukuran kuersetin dan rutin memiliki nilai simpangan baku relatif (%SBR) sebesar 2.14% dan 2.44%, berturut-turut untuk kuersetin dan rutin. Hal ini menunjukkan bahwa SPCE termodifikasi grafena cukup potensial untuk deteksi simultan kuersetin dan rutin secara elektrokimia. Kata kunci: Grafena, kuersetin, rutin, screen printed carbon electrode, voltametri siklik. Quercetin and rutin are natural antioxidant from flavonoid group. The compounds can be detected using several analytical technique, including electrochemical technique due to its redox activity. In this study, simultaneous detection of quercetin and rutin was performed at graphene-modified screen printed carbon electrode (SPCE) using cyclic voltammetry technique. Graphene-modified SPCE was prepared from mixture of graphene:sodium polyacrylate (1:1) via drop casting method. Ethanol 70%:phosphate bufer pH 7 (6:4) was used as electrolyte solution for quercetin and rutin measurement. The result shows that oxidation peak of quercetin and rutin was detected at potential of 0.179 V and 0.310 V vs Ag/AgCl, respectively. Graphene-modified SPCE produce higher intensity of oxidation current and higher sensitivity for quercetin and rutin measurement. Simultaneous detection of quercetin and rutin at graphene modified SPCE provide linearity with R2 = 0.9905 and R2 = 0.9816, respectively for quercetin and rutin. Detection limits of quercetin and rutin respectively was 0.5369 mM and 0.7495 mM while limit quantitation was 1.7898 mM dan 2.4985 mM. Precision of quercetin and rutin measurement was moderate with percent relative standard deviation (%RSD) of 2.14% and 2.44%, consecutively for quercetin and rutin. This suggests that graphene-modified SPCE is potential for simultaneous electrochemical detection of quercetin and rutin. Keywords: Cyclic voltammetry, graphene, quercetin, rutin, screen printed carbon electrode.

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.

Hubungan Lama Distilasi, Kandungan Senyawa, dan Bioautografi Antioksidan Minyak Atsiri Bangle (Zingiber purpureum) Irmanida Batubara; Rahadyanoto Trimulia; Eti Rohaeti; Latifah K Darusman
INDONESIAN JOURNAL OF ESSENTIAL OIL Vol 3, No 1 (2018)
Publisher : Institut Atsiri Universitas Brawijaya

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Bangle (Zingiber purpureum) merupakan salah satu tanaman obat yang mengandung minyak atsiri. Untuk mengambil minyak atsiri dari rimpang bangle dapat dilakukan distilasi dengan perbedaan lama distilasi. Tujuan penelitian ini adalah menentukan kadar minyak atsiri dari rimpang bangle dan membandingkan kandungan senyawanya berdasarkan waktu distilasi yang berbeda. Minyak atsiri bangle didistilasi dengan perbedaan rentang waktu, yaitu 0-3 jam, 3-6 jam, dan 6-9 jam. Rendemen minyak atsiri yang diperoleh berbeda walaupun selang waktu yang digunakan sama. Kadar senyawa minyak atsiri berbeda bergantung pada lama waktu distilasi. Perbedaan tersebut ditentukan melalui kromatografi gas-spektrometri massa. Kandungan senyawa sabinena optimum pada waktu distilasi 0-3 jam, osimena pada rentang waktu 3-6 jam, dan naftalena pada rentang waktu 6-9 jam. Profil kromatografi lapis tipis dan bioautografi antioksidan terhadap DPPH untuk ketiga minyak juga ditentukan.

Gum Benzoin (Styrax benzoin) as Antibacterial against Staphylococcus aureus Asih Gayatri; Eti Rohaeti; Irmanida Batubara
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Gum benzoin (Styrax benzoin) is one of nontimber forest product classified into the resin group. The aim of the study was to determine the component from gum benzoin as an antibacterial against Staphylococcus aureus. Indonesian gum benzoin was obtained from North Sumatra and has antibacterial activity against S. aureus with the MIC (minimum inhibitory concentration) and MBC (minimum bactericidal concentrationo) values of its ethyl acetic extract of 1.00 mg/mL and 2.00 mg/mL, respectively. Thin layer chromatography (TLC) was used in purification of ethyl acetate extract of the gum benzoin. The active component was detected by TLC contact bioautography. The bands with Rf of 0.21, 0.77, and 0.87 had growth inhibition activity to the S. aureus. The active antibacterial band with Rf of 0.21 was isolated and it could be an alkaloid component.

L-Histidine-Modified Silica from Rice Husk and Optimization of Adsorption Condition for Extractive Concentration of Pb(II) Nurhajawarsi Nurhajawarsi; Mohamad Rafi; Utami Dyah Syafitri; Eti Rohaeti
The Journal of Pure and Applied Chemistry Research Vol 7, No 2 (2018): Edition May-August 2018
Publisher : Chemistry Department, The University of Brawijaya

A new chelating agent, L-histidine-modified silica from rice husk (LHSRH), was prepared to increase the adsorption capacity and selectivity for Pb(II). LHSRH was synthesized by immobilizing L-histidine on silica from rice husk (RH) modified with 3-aminopropyltrimethoxysilane (APTMS). Silica from rice husk (SRH) was synthesized via precipitation process by adding hydrochloric acid solution to rice husk ash (RHA). The RHA was subsequently destructed with sodium hydroxide and heated to obtain sodium silicate (Na2SiO3). SRH was characterized by Fourier transform infrared spectroscopy and x-ray diffraction. The LHSRH was used further to adsorp Pb(II) metal ion. The pH range, amount of adsorbent, and adsorption time were optimized by response surface methodology. The optimum condition for the adsorption of Pb(II) was pH 5, an amount of adsorbent 0.1 g; and adsorption time 15 minutes. The adsorption capacity for Pb(II) ion was found to be 62.5 mg/g. The adsorption behavior of the matrix followed the Langmuir’s model.

Co-Authors A. KUSNANTO Achmad Fauzi Aditya Kurniawan Ali Miftahudin Anak Agung Gede Sugianthara Aryo Tedjo Asih Gayatri Budi Riza Putra Budi Riza Putra Budi Riza Putra Casnan, Casnan Citra Ajeng Palupi Deden Saprudin Derry Permana Desi Ramadhanti Djeni Hendra Erliza Noor Hadjomidjojo, Hartrisari Hartrisari Hadjomidjojo Hartrisari Hardjomidjojo Ibrahim Ibrahim Irmanida Batubara Irzaman, Irzaman J. JAHARUDDIN Latifah K Darusman Latifah K Darusman Latifah K. Darusman Latifah K. Darusman Latifah Kosim Darusman Linda Trivana Linda Trivana Linda Trivana, Linda Makmum Syafi’i Manggar Arum Aristri Moh Arif Rohman Nur Hakim Mohamad Rafi Muddathir, Ali Mahmoud N. G. Pamungkas Nur Adi Saputra Nurdiani Nurdiani, Nurdiani Nurhajawarsi Nurhajawarsi Purnawan Purnawan Rahadyanoto Trimulia Reni Febriani Rudi Heryanto Septaningsih, Dewi Anggraini Siahaan, Arnold Patogi Silvi Agusri Putri Sri Sugiarti Tamida Elinda Utami Dyah Syafitri Wulan Tri Wahyuni

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