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INDONESIA
VALENSI
Published by Universitas Islam Negeri Syarif Hidayatullah Jakarta
ISSN : 24606065     EISSN : 25483013     DOI : 10.15408/jkv
Core Subject : Science,
Chemistry
Jurnal Kimia Valensi is a biannual and peer-reviewed open access journal published by Department of Chemistry, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta. This journal covering all aspect of chemistry.
Arjuna Subject : Umum - Umum
Articles 425 Documents
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Determination of Iron (Fe) and Calcium (Ca) in NIST SRM 1566b (Oyster tissue) using Flame Atomic Absorption Spectrometry (F-AAS) by Standard Addition Method Fitri Dara; Y Susanto Ridwan
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.2, Mei 2011
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (118.179 KB) | DOI: 10.15408/jkv.v2i2.205

Abstract

NIST Standard Reference Material (SRM 1566b) was employed for the determination of Iron (Fe) andCalcium (Ca) as nutrients in food matrix using Flame Atomic Absorption Spectrometry (F-AAS). Thecertified value of SRM 1566b for Fe and Ca are 205.8 ± 6.8 mg/kg and 0.0838 ± 0.0020 (%) or 838 ±20 mg/kg, respectively. This certified values are based on results obtained by single primary method(Isotope Dilution Inductively Couple Plasma Mass Spectrometry) at NIST with confirmation by othermethods at National Metrology Institute of P.R. China. This paper proposed a method fordetermination of Fe and Ca in food matrix as recommended by AOAC official with a littlemodification. The method was commenced from the destruction of all organic matter by dry oxidationbefore analysis by standard addition. Under optimum condition, the results of the determination of Feand Ca in SRM 1566b were agreed well with the certificate value. This method would be useful forroutine analysis in food testing laboratories.
Kajian Termodinamika Adsorpsi Hibrida Merkapto-Silika dari Abu Sekam Padi Terhadap Ion Co(II) Dwi Rasy Mujiyanti; Noer Komari; Ningtyas Indah Sari
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.2, November 2013
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (341.2 KB) | DOI: 10.15408/jkv.v3i2.500

Abstract

AbstrakTelah dilakukan penelitian tentang kajian termodinamika adsorpsi hibrida merkapto-silika dari abu sekam padi terhadap ion Co(II). Penelitian ini bertujuan untuk menentukan kapasitas dan energi adsorpsi hibrida merkapto-silika (HMS) dan silika gel (SG) terhadap ion Co(II). Pada penelitian ini, silika gel dibuat menggunakan natrium silikat dari abu sekam padi. Selanjutnya, senyawa organik 3-(trimetoksisilil)-1-propantiol diimobilisasi pada SG menghasilkan HMS. Adsorben dikarakterisasi menggunakan difraktometer sinar-X dan spektrofotometer FTIR. Larutan Co(II) kemudian dikontakkan dengan SG dan HMS pada variasi pH, waktu, dan konsentrasi awal. Hasil penelitian kapasitas adsorpsi yang diperoleh HMS hampir tiga kali lebih besar dibandingkan dengan SG, dengan besarnya kapasitas adsorpsi masing-masing yaitu 250,00 mg/g dan 90,91 mg/g. Sedangkan energi adsorpsi yang diperoleh adalah 51,69 KJ/mol untuk SG, dan 23,65 KJ/mol untuk HMS.Kata kunci : sekam padi, hibrida merkapto-silika, adsorpsi, ion Co(II)AbstractA research on the study of the thermodynamics of adsorption mercapto-silica hybrid from rice husk ash to the ions Co (II) has been done. This study aims to determine capacity and energy adsorption of hybrid mercapto-silica (HMS) and silica gel (SG) to the ions Co (II) . In this study, silica gel was made using sodium silicate from rice husk ash. Furthermore, the organic compound 3-(trimethoxysilil )-1-prophantiol immobilized on SG to HMS produced. Adsorbents were characterized using X-ray diffraction and FTIR spectrophotometer. Solution of Co (II) is then contacted with the SG and HMS at the variation of pH, time , and initial concentration. The results obtained by HMS adsorption capacity is almost three times larger than the SG, the magnitude of adsorption capacity of each is 250.00 mg / g and 90.91 mg / g . While the adsorption energy obtained is 51.69 KJ / mol for SG , and 23.65 KJ / mol for HMS.Keywords : rice husk, mercapto-silica hybrid , adsorption , ion Co(II)
Sintesis N-Oktilsinamamid dan Aktivitasnya terhadap Sitotoksik Sel Kanker Leukemia P388 Teni Ernawati; Neneng Nurhalimah; Minarti Minarti
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 3, No. 2, November 2017
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (730.546 KB) | DOI: 10.15408/jkv.v0i0.5843

Abstract

Sintesis senyawa N-Oktilsinnamamid yang diturunkan dari senyawa metil trans-sinamat dengan menggunakan katalis basa telah dilakukan. Senyawa metil sinamat terlebih dahulu dikonversi menjadi asam sinamat melalui reaksi hidrolisis dengan basa menghasilkan asam sinamat. Selanjutnya asam sinamat diamidasi dengan menggunakan oktilamin dan 1,3 disikloheksilkarboodiimide (DCC) dan 4-dimetilaminopiridin (DMAP) sebagai katalis. Dari penelitian ini diperoleh rendemen hasil sintesis asam sinamat, sintesis N-Oktilsinnamami yang cukup baik. Hasil reaksi diidentifikasi dengan menggunakan 1H-NMR, 13C-NMR dan LC-MS. Uji sitotoksik senyawa N-Oktilsinamamid terhadap sel leukemia P388 diperoleh nilai IC50=6.71 µg/mL. Synthesis of N-Octylcinnamamide compound derived from methyl trans-cinnamate using abase catalyst has been done. First, The compound of methyl trans-cinnamate was converted into cinnamic acid by hydrolysis reaction with an alkaline condition. Furthermore cinnamic acid was amidated by using octylamine and 1,3 dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) as a catalyst. The results of this study were obtained synthesis of cinnamic and synthesis of N-Octylcinnamamide are good enough. Identification of this product was using by 1H-NMR, 13C-NMR and LC-MS.  Cytotoxic test of N-Octylcinnamamide against P388 leukemia cell was obtained IC50=6.71µg/mL.
Uji Karakteristik Biodiesel yang dihasilkan dari Minyak Goreng Bekas Menggunakan Katalis Zeolit Alam (H-Zeolit) dan KOH Isalmi Aziz; Siti Nurbayti; Arif Rahman Hakim
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.5, November 2012
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.687 KB) | DOI: 10.15408/jkv.v2i5.296

Abstract

Penelitian ini bertujuan untuk mengetahui karaketristik biodiesel yang dihasilkan dari minyak goreng bekas menggunakan katalis H-Zeolit dan KOH. Biodiesel dibuat dengan mereaksikan minyak goreng bekas dan metanol dalam perbandingan 4:1 (volum) dan suhu 60 oC. Biodiesel yang dihasilkan dengan menggunakan katalis KOH mempunyai densitas 0,85 g/mL dan viskositas 3,09 cSt. Senyawa kimia yang dominan dalam biodiesel adalah metil heksadekanoat (29.90% area), 9-octadecenoic acid (Z)-metil ester (55.80% area). Sedangkan biodiesel yang menggunakan katalis H-zeolit mempunyai densitas 0,78 g/mL dan viskositas 0,35 cSt. Senyawa kimianya adalah metil heksadekanoat (10,85% area) dan 9-octanoic acid (Z)-metil ester (11,97% area). Biodiesel menggunakan katalis KOH memenuhi syarat kualitas biodiesel menurut SNI.
Delignification of Sawdust White Teak (Gmelina arborea Roxb.) by Fungi Phanerochaete chrysosporium Irradiated Gamma Ray Nurhasni Nurhasni; Tri Retno Dyah Larasati; Afinanisa Iksan
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 2, November 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2669.083 KB) | DOI: 10.15408/jkv.v2i2.3079

Abstract

Abstrak Biomassa lignoselulosa yang merupakan limbah pemanenan kayu harus dilakukan proses untuk memisahkan selulosa, hemiselulosa dan lignin sehingga dapat termanfaatkan. Penelitian ini bertujuan untuk mengetahui efektivitas inokulan fungi Phanerochaete chrysosporium iradiasi gamma dan pretreatment kimia terhadap percepatan delignifikasi serbuk kayu jati putih (Gmelina arborea Roxb.) sehingga dapat dimanfaatkan dalam proses pulping. Pada penelitian ini dilakukan pretreatment substrat kayu jati putih (Gmelina arborea Roxb.) menggunakan larutan NaOH 1% dan H2SO4 1% serta iradiasi gamma Co-60, yang mempunyai daya ionisasi kecil, daya tembus yang tinggi serta Co-60 dapat memancarkan sinar gamma dengan waktu paruh pendek. Penelitian ini dilakukan dalam dua tahap, tahap pertama penentuan dosis optimum iradiasi gamma terhadap fungi Phanerochaete chrysosporium (0 Gy, 200 Gy, 400 Gy, 600 Gy, 800 Gy, dan 1000 Gy) dan tahap kedua analisis karakteristik substrat kayu jati putih yang telah di pretreatment dengan metode Solid State Fermentation (SSF) selama 21 hari. Hasil penelitian menunjukkan bahwa dosis optimum pemberian iradiasi gamma pada fungi Phanerochaete chrysosporium yaitu pada dosis 600 Gy yang dapat meningkatkan aktivitas enzim lignin peroksidase (LiP) sebesar 22.18 U/mL. Proses pretreatment kimia dengan menggunakan H2SO4 1% dapat mempercepat proses biodelignifikasi yang menghasilkan efisiensi degradasi lignin tertinggi yaitu sebesar 25.65%.   Kata kunci: Lignoselulosa, delignifikasi, Solid State Fermentation (SSF), Phanerochaete chrysosporium,iradiasi gamma.   Abstract   Lignocellulose biomass is waste wood harvesting should be a process for separating cellulose, hemicellulose and lignin that can be utilized. This study aims to determine the effectiveness of the inoculant fungi Phanerochaete chrysosphorium gamma irradiation and chemical pretreatment to accelerate delignification powder white teak (Gmelina arborea Roxb.). In this research, pretreatment of substrate wood white teak (Gmelina arborea Roxb.) Using a solution of NaOH 1% and H2SO4 1% and gamma-ray irradiation Co-60, have the power of ionization is small, high penetrating power, and Co-60 which can emit gamma rays a short half-life time. This research was conducted in two stages, the first stage of determining the optimum dose gamma irradiation for fungi Phanerochaete chrysosphorium (0 Gy, 200 Gy, 400 Gy, 600 Gy, 800 Gy, and 1000 Gy) and the second stage of the analysis of the characteristics of the substrate wood white teak has been in pretreatment by methode Solid State Fermentation (SSF) for 21 days. The results showed that the optimum dose administration of gamma irradiation on fungi Phanerochaete chrysosphorium is a dose of 600 Gy which can increase the activity of enzymes lignin peroxidase (LiP) amounted to 22.18 U / mL. Chemical pretreatment process using H2SO4 1% biodelignification can accelerate the process of lignin degradation that produces the highest efficiency of 25.65%.   Keywords: Lignocellulose, delignification, Solid State Fermentation (SSF), Phanerochaete chrysosporium, gamma irradiation. DOI: http://dx.doi.org/10.15408/jkv.v0i0.3079
A Computational Study on the Effects of Molecular Structures of Di-n-butyldithiophosphate and of its Derivatives on the Stability of Their Complex Compounds with Rare-Earth Elements Nurdeni Nurdeni; Atje Setiawan Abdullah; Budi Nurani Ruchjana; Hardianto A; Anggraeni A; Muthalib A; Husein H Bahti
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (403.572 KB) | DOI: 10.15408/jkv.v5i2.10652

Abstract

The stability of complex compounds  formed from the ligand di-n-butyldithiophosphate (DBDTP) and its derivatives, with ions of rare-earth elements (REEs), such as gadolinium ion (Gd3+), is an important factor in the separation and purification processes of the elements using solvent extraction method. The complex stability is dependent, one of which, on the partial charge of the donor atom (S atom in this case) in the molecule of DBDTP or its derivatives. The more negative the partial charge of the donor atom, the more stable is the complex compound formed. The purpose of this study is to explore the effect of electron donating, and of electron withdrawing groups, as well as the effect of the structure of the butyl group in the molecules of  DBDTP and or its derivatives on the partial charge of the donor atom. The method used was the semi empirical quantum mechanical calculations, i.e. the Austin Model 1 (AM1). The results of the study showed that the electron withdrawing group of -CN had resulted in the most positive charge on the donor atom, if it is on the second carbon atom of the butyl group in the DBDTP and or its derivatives. Conversely, in the same carbon atom position, the donating electron group of -CH=CH2 had generated the most negative partial charge on the donor atom. Furthermore, the results of this study also revealed that the sec-butyl isomer produced the most negative partial charge on the donor atom, among other isomers.
Karakterisasi Senyawa Aktif Antibakteri Ekstrak Air Bunga Kecombrang (Etlingera elatior) Sebagai Bahan Pangan Fungsional Dede Sukandar; Nani Radiastuti; Ira Jayanegara; Adeng Hudaya
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.1, November 2010
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (596.662 KB) | DOI: 10.15408/jkv.v2i1.232

Abstract

Telah dilaporkan penelitian mengenai aktivitas antimikroba ekstrak air bunga kecombrang(Etlingera elatior). Penelitian ini bertujuan memberikan bukti ilmiah keunggulan tanamankecombrang sebagai bahan pangan fungsional.. Pengujian aktivitas antibakteri dilakukanmenggunakan metode difusi cakram dan analisa komponen kimia dengan kromatografi GCMS.Ekstrak air bunga kecombrang bersifat antibakteri terhadap E. Coli (zona hambat 4,8mm/konsentrasi 60%) dan S. Aureus (zona hambat 6,87 mm, konsentrasi 20%). Ekstrak air bungakecombrang memiliki komponen utama1-dodekanol (tR=11,60, area=11,73, kemiripan 95 %), 3-metil-1-okso-2-buten 1-(21,41, 51-trihidroksi fenil) (tR=13,02, area=3,17 kemiripan 57 %) dan 1-tetradekena (tR= 13,26, area=6,03, kemiripan 98 %.
Ekstraksi Emas dari Limbah Papan Sirkuit Telepon Genggam Menggunakan Teknik Membran Cair Emulsi Imam Santoso; Silvana Tatian; Irna Ratna Kartika; Tritiyatma H
Jurnal Kimia Valensi Jurnal Valensi Volume 4, No.1, Mei 2014
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (102.326 KB) | DOI: 10.15408/jkv.v4i1.1076

Abstract

Abstrak Penelitian ini bertujuan untuk menentukan persen ekstraksi emas dari limbah papan sirkuit telepon genggam dengan teknik  membran cair emulsi menggunakan MIBK sebagai carrier. Reaksinya terjadi secara simultan di permukaan membran, antara senyawa yang akan dipisahkan pada fasa umpan dengan senyawa pembawa pada fasa organik. Logam emas hasil reaksi akan terdifusi ke fasa membran yang pada akhirnya hasil ekstraksi terkumpul dan terkonsentrasi di fasa penerima. Sebelum diaplikasikan ke limbah telepon , terlebih dahulu dipelajari beberapa parameter yang berpengaruh  terhadap perolehan persen ekstraksi. Pada penelitian ini kondisi optimum untuk parameter pembuatan fasa emulsi yaitu 1:1, pengaruh kecepatan pembuatan emulsi pada yaitu 1000 rpm.Pengaruh konsentrasi carrier terhadap persen ekstraksi emas dengan konsentrasi MIBK sebesar 3%, pengaruh kecepatan kontak terhadap persen ekstraksi emas adalah pada 1000 rpm. Penerapan kondisi optimum pada limbah papan sirkuit telepon genggam memberikan persen ekstraksi Au sebesar 83.24%. Kata Kunci: limbah papan sirkuit telepon genggam, MIBK, teknik membran cair emulsi. Abstrack This research aim is to determine extraction percentage of gold from cellular phone circuit board waste using emulsion liquid membrane technique with Methyl Isobutyl Ketone (MIBK) as carrier. The reaction occur simultaneously on the membrane surface, between compound going to be separate in feed phase with carrier compound in organic phase. Gold from reaction will diffuse into membrane phase which finally will be collected and concentrated in receiving phase. Before it applied to phone waste, there are several parameters studied which influence the extraction percentage result. In this research the optimum condition for building emulsion phase parameter is 1:1, effect on building emulsion rate is 1000 rpm. Carrier concentration effect to extraction percentage of gold is at 3% MIBK and contact rate effect is at 1000 rpm. Optimum condition application to cellular phone circuit board waste give Au extraction percentage of 83.24%. Keywords: cellular phone circuit board waste, MIBK, emulsion liquid membrane technique.
Interkalasi Ion Mefenamat pada Host Mg/Al Hidrotalsit sebagai Rancangan Obat Lepas Lambat Fajar Indah Puspita Sari
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (831.864 KB) | DOI: 10.15408/jkv.v4i2.7600

Abstract

The aim of this study was to intercalate mefenamic ions in the interlayer structure of Mg/Al hydrotalcite and to test the release of mefenamic ion from host hydrotalcite interlays to determine its potential as a slow release drug design. Intercalation of mefenamic ions into interlayer structure of Mg/Al hydrotalcite by ion exchange has been studied. This success intercalation was confirmed by XRD data, diffractogram before and after intercalation showed a shift of d003, d006 and d009. The change of d003 from 8.717 Å to 22.017 Å indicates that the mefenamic ion has entered the interlayers of hydrotalcite. The FTIR analysis confirms that the nitrate ion was successfully replaced by mefenamic ions in the hydrotalcite interlayer. FTIR data indicate the absorption of symmetry and asymmetry of carboxylic groups in 1381 and 1612 cm-1 of the mefenamic ion. Have studied ion exchange kinetics and release of mefenamic ions from hydrotalcite hosts to determine their potential as a slow-release drug design. The result show mefenamic ion can be released from the hydrotalcite host for 6 hours. So that Mg / Al hydrotalcite has the potential to be used in slow release drug design.  
Pembuatan produk biodiesel dari Minyak Goreng Bekas dengan Cara Esterifikasi dan Transesterifikasi Isalmi Aziz; Siti Nurbayti; Badrul Ulum
Jurnal Kimia Valensi JURNAL Valensi Volume 2, No. 3, November 2011
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.482 KB) | DOI: 10.15408/jkv.v2i3.115

Abstract

Biodiesel merupakan bahan yang sangat potensial untuk menggantikan bahan bakar solar. Bahan bakunya dapat diperbaharui dan bersifat ramah lingkungan. Minyak goreng bekas dapat digunakan sebagai bahan baku pembuatan biodiesel. Kadar asam lemak bebas yang tinggi dalam minyak goreng bekas memerlukan pretreatment (esterifikasi) dalam proses pembuatan biodiesel. Sehingga dalam penelitian ini dilakukan dua tahap reaksi yaitu esterifikasi dan dilanjutkan dengan tahap transesterifikasi. Pada tahap esterifikasi asam lemak bebas dapat diturunkan kadarnya dari 2,5 % menjadi 1,1%. Tahap transesterifikasi didapatkan yield biodiesel sebesar 88%. Karakteristik biodiesel yang dihasilkan yaitu: viskositas dan densitas pada suhu 40oC sebesar 3,2 cSt dan 0,85 g/mL, kadar air 0,002%, indeks setana 51, titik nyala 176oC, dan titik tuang 9oC. Kata kunci: Biodiesel, minyak goreng bekas, esterifikasi, transesterifikasi

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