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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
 3   4   5   6   7 
Kinetika Reaksi Transesterifikasi Minyak Goreng Bekas Isalmi Aziz
Jurnal Kimia Valensi Jurnal Valensi VOLUME 1, NO.1, NOVEMBER 2007
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1716.881 KB) | DOI: 10.15408/jkv.v1i1.209

Abstract

Biodiesel (metil ester) yang dihasilkan dari reaksi transesterifikasi minyak jelantahmerupakan bahan yang sangat potensial untuk menggantikan bahan bakar diesel. Biodieselini diproduksi secara sinambung dalam reaktor alir tangki berpengaduk (RATB). Pereaksiyang digunakan adalah metanol dan katalis KOH. Proses dilakukan dengan kecepatanpengadukan konstan sebesar 800 rpm, perbandingan ekivalen metanol dan minyak tetap1,54 kali stokiometri, dan waktu tinggal 60 menit. Sedangkan suhu dan konsentrasi katalisdivariasikan. Nilai konstanta kecepatan reaksi di tinjau pada kondisi unsteady state RATB.Korelasi konstanta kecepatan reaksi dengan suhu adalah k = 2(107) e-6312,2/Tml/mgrek/menit dan konstanta kecepatan reaksi dengan konsentrasi katalis k =3(10-4) e5,8742.Ckat ml/mgrek/menit. Kondisi proses yang optimal adalah 333 K dankonsentrasi katalis 1 %.
Steroid dan Lignan dari Kayu Batang Durio oxleyanus (Malvaceae) Rudiyansyah Rudiyansyah
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.1, Mei 2013
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (302.303 KB) | DOI: 10.15408/jkv.v3i1.330

Abstract

Pencarian senyawa metabolit sekunder dari ekstrak aseton kayu batang tumbuhan Durio oxleyanus Griff telah menghasilkan senyawa steroid androst-1,4-dien-3,7-dion (1) beserta dua senyawa lignan yaitu boehmenan (2) dan boehmenan X (3) dan fraksidin (4). Struktur kimia senyawa hasil isolasi tersebut dielusidasi berdasarkan data spektroskopi dan perbandingan dengan data spektrum yang telah dilaporkan sebelumnya. Kata Kunci: Durio, steroid, lignan, kumarin
A New Antiplasmodial Compound from the Papuan Marine Sponge Xestospongia sp. Murtihapsari Murtihapsari; Amir M Suruwaky; Kadarusman Kadarusman; Dikdik Kurnia; Tati Herlina; Unang Supratman
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 1, Mei 2018
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.864 KB) | DOI: 10.15408/jkv.v4i1.6735

Abstract

A new antiplasmodial compound, 2-(3H-diazirine-3-yl)benzaldehyde (1), has been isolated from the Papuan marine sponge Xestospongia sp. The structure elucidation of compound 1 was determined by spectroscopic evidences including UV, IR, MS, 1D and 2D-NMR analysis. Compound 1 showed moderate antiplasmodial activity against Plasmodium falciparum with IC50 value of 1.08 x 10-6 mM. DOI:http://dx.doi.org/10.15408/jkv.v4i1.6735
Produksi Gas hidrogen dari Limbah Alumunium dan Uji Daya Listrik dengan Fuel Cell Yusraini DIS
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 (329.403 KB) | DOI: 10.15408/jkv.v2i5.300

Abstract

Teknologi Fuel Cell adalah teknologi masa depan yang ramah lingkungan. Bahan baku untuk fuel cell adalah hidrogen. Produksi hidrogen dari limbah alumunium dan storage telah dilakukan. Penelitian ini bertujuan untuk memanfaatkan limbah alumunium (alumunium foil dan kaleng minuman) yang direaksikan dengan larutan beralkalin untuk menghasilkan hidrogen. Hidrogen yang dihasilkan sebanding dengan tekanan yang terukur yang diukur dengan CASSY LAB Version 1.41. Hasilnya adalah: a. Semakin tinggi konsentrasi NaOH (5 %, 10 % dan 15 %) semakin cepat reaksi produksi hidrogen berlangsung. b. Jumlah limbah alumunium yang berbeda (0,01 g, 0,05 g dan 0,10 g) kurang berpengaruh terhadap waktu reaksi jika konsentrasi NaOHnya sama. c. Temperatur yang dihasilkan berkisar antara 27 oC - 33,7 oC, semakin banyak jumlah alumunium yang direaksikan semakin tinggi temperatur yang dihasilkan. d. Daya listrik yang dihasilkan dari 0,10 gram alumunium foil adalah sebesar 45-51 watt dengan daya rata-rata 0,08 watt per detik. e. Daya listrik yang dihasilkan dengan kaleng Coca Cola adalah sebesar 12,13 watt dengan daya rata-rata 0,009 watt per detik.
Hasil In Silico Senyawa Z12501572, Z00321025, SCB5631028 dan SCB13970547 dibandingkan Turunan Zerumbon terhadap Human Liver Glycogen Phosphorylase (1l5Q) sebagai Antidiabetes Fitri Kusvila Aziz; Cantika Nukitasari; Fauziyah Ardli Oktavianingrum; Lita Windy Aryati; Broto Santoso
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 (843.026 KB) | DOI: 10.15408/jkv.v2i2.4170

Abstract

Abstrak Human Liver Glycogen Phosphorylase (HLGP), suatu katalis glikogen yang mengontrol pelepasan glukosa-1-fosfat glikogen dari hati. Enzim ini mempunyai peran sentral dalam luaran glukosa hati sehingga menjadi target obat antidiabetik. Kajian docking dilakukan pada komputer dengan prosesor Intel Pentium, RAM 1 GB dan Windows 7. Ligan yang digunakan adalah senyawa obat (Z12501572, Z00321025, SCB5631028 dan SCB13970547), dataset pembanding aktif glycogen phosphorylase outer dimer site (PYGL-out) dan decoysdari www.dekois.com dan turunan zerumbon. Protein dipisahkan dari ligan nativ dan semua ligan beserta protein dikonversi menggunakan PyRx. Visualisasi interaksi ligan-protein dihasilkan dengan program Protein-Ligand Interaction Profiler (PLIP) dan PyMOL. Senyawa ZER11 memiliki binding energy terbaik, yaitu -7.11 kkal/mol (untuk metode LGA dan GA) dan -4.08 kkal/mol untuk metode SA. Nilai binding energy tersebut lebih rendah dari pada nilai untuk ligan native dan satu dari keempat senyawa obat, terlebih jika dibandingkan dengan bindingaffinity dari dataset dan decoys. Interaksi ligan-protein pada ketiga metode tersebut ditemukan sangat bervariasi. Hal berbeda terjadi untuk metode Vina, bindingenergy ZER11 (-9.9 kkal/mol) lebih baik dibandingkan dengan ligan native dan keempat senyawa obat. Senyawa ZER11 memiliki residu interaksi yang sama dengan ligan native pada TRP67 dan LYS191 untuk metode Vina. Kata kunci: PDBID-1L5Q, AutoDock, docking molekuler, vina, antidiabetes   Abstract Human Liver Glycogen Phosphorylase (HLGP) can catalyze glycogen and control the release of glucose-1-phosphate of glycogen from the liver. This enzyme has a central role in output rule of liver glucose as it can be used as an antidiabetic drug targets. Docking studies were carried out on PC with Intel Pentium, 1 GB RAM, in environment of Windows 7. Ligands used are drug compounds (Z12501572, Z00321025, SCB5631028 and SCB13970547), the active dataset comparator wasglycogenphosphorylase outer dimer site (PYGL-out) and decoys from www.dekois.com andzerumbonederivates. Protein was separated from its native ligand and all ligands including the protein were converted to pdbqt using PyRx. The interaction of protein-ligand was visualized using software of PLIP and PyMOL. Compound of ZER11 had the best binding energy were -7.11 kcal/mol (LGA and GA) and -4.08 kcal/mol (SA). The binding energy value was lower than the ligand native and one of the four drug compounds, especially compared with the binding affinity of dataset and decoys. Vice versa, for Vina method, the value of ligand binding protein for ZER11 (-9.9 kcal/mol) was better than the ligand native and all of the fourth drugcompounds. Vina result showed that ZER11 had the same residual interaction as the ligand native, which are TRP67 and LYS191. Keyword: PDBID-1L5Q, AutoDock, molecular docking, vina, antidiabetic DOI: http://dx.doi.org/10.15408/jkv.v0i0.4170
Produksi Gas Hidrogen Dari Limbah Alumunium Yusraini Dian Inayati Siregar
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 (563.697 KB) | DOI: 10.15408/jkv.v2i1.236

Abstract

Penelitian mengenai produksi gas hidrogen dari limbah alumunium telah dilakukan. Fokuspenelitian ini adalah untuk memanfaatkan limbah alumunium yang belum termafaatkan secaraoptimal menjadi gas hidrogen yang dibutuhkan sebagai sumber fuel cell, sumber energi yangramah lingkungan. Penelitian ini diawali dengan mencari katalis (H2SO4, NaOH, KOH dan NaCl),yang optimal untuk produksi gas hidrogen dari limbah alumunium foil. Tahap selanjutnya adalahmempelajari pengaruh konsentrasi katalis dan jumlah limbah alumunium foil dan limbahalumunium dari kaleng minuman untuk produksi gas hidrogen. Hasil penelitian menunjukkahbahwa gas hidrogen dapat diproduksi dengan menggunakan limbah alumunium foil dan limbahalumunium dari kaleng minuman pada suasana basa (NaOH). Semakin tinggi konsentrasi NaOH,semakin cepat waktu reaksi tetapi produksi gas hidrogennya cenderung tetap.Semakin besar massa limbah alumunium foil semakin cepat waktu reaksi dan produksi gashidrogennya juga semakin besar. Semakin besar massa limbah alumunium kaleng minumansemakin lambat waktu reaksi dan produksi gas hidrogennya semakin besar. Kesimpulannya adalahdari 0,05 gram limbah alumunium (alumunium foil) dihasilkan 0,006 gram hidrogen.
Pengaruh Ion Na+, Ion Hg2+ dan Ion Cr3+ Terhadap Kinerja Sensor Potensiometri Ion Timbal (II) Tipe Kawat Terlapis Berbasis Pirofilit Qanitah Fardiyah; Barlah Berlianti; Ika Rosemiyani
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (883.065 KB) | DOI: 10.15408/jkv.v0i0.3144

Abstract

Generally ionophores  (active materials) in a potentiometric is derived from organic compounds. In this research used ionophores derived from ainorganic compounds that pyrophyllite. Potentiometric sensors lead (II) ions based on pyrophyllite as ionofor has been developed. The electrode had  polyvinilchloride (PVC) as polymer matrix and dioctylpthalate (DOP) as plasticizer. It showed a good Nernstian slope of 29.33 mV/decade, a lead linear range concentration between 10-1- 10-5 M, and detection limit of 8.054 x10-6 M  (equal with 1.669 ppm of lead). By using the electrode, the objectives of this research were to investigate the effect of interfering ions  Na+, ion Hg2+ and ion Cr3+ to the performance of the potentiometric sensors lead(II) ion based pyrophyllite coated wire type. The selective coefficients (kij) were determined using the mix solution methode  at  10-3 M of interfering ion. The result showed that the potentiometric sensors lead(II) ions based  on pyrophyllite coated wire type could be used optimally at  pH 5. The potentiometric sensors lead(II) ion based pyrophyllite coated wire type showed a good selectivity for interfering ions (Na+, Hg2+, dan Cr3+) and showed no interference to the performance of the potentiometric sensors lead (II) ion based pyrophyllite coated wire type with selectivity order of Pb2+> Hg2+> Cr3+> Na+. DOI :http://dx.doi.org/10.15408/jkv.v0i0.3144
Identifikasi Komposisi Kimia dan Uji Aktivitas Antioksidan dari Biji Kurma (Phoenix dactylifera) Yusraini Dian Inayati Siregar; Tarso Rudiana; Windi Riyadi
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 (533.978 KB) | DOI: 10.15408/jkv.v4i2.8818

Abstract

Dates are a component of dates that have 6.10-11.47% of all dates. In some countries, dates are a major problem in the processing industry because the seeds currently only become waste. This research was conducted to determine the solvent that produces the largest yield using the soxhletation method and determine its antioxidant activity. Dates are disoxletasion with a variety of solvents n-hexane, diethyl ether, and ethanol. Also carried out the variation of extraction time for 1.5; 2; and 2.5 hours. Based on the results of the study showed that the results of the largest date seed extract were obtained using ethanol of 4.93% for 2.5 hours. Antioxidant activity of date palm seed extract (IC50) using DPPH ethanol extract method has IC50 of 2.27 ppm; n-hexane extract 8396.56 ppm; and diethyl ether extract 9826.88 ppm. Inhibition of date palm seed extract using the TBA method derived from ethanol extract of 98.22% at a concentration of 250 ppm. The results of the analysis using LC-MS showed that ethanol extract was thought to contain 13-hydroxyabscisic acid compound, 1-ethylidene-4-methylidene-2oxo-7-(propan-2-il)-tocahydro-1H-indent-5-il- 3-methylpent-2-enoate, 12-hydroxy-acid (8,10,14) -eicosatrienoic and 1-hydroxy-3- (pentadecanoiloxy) propan-2-il (5,8,11,14) -icosa-5, 8,11,14-tetraenoate. The results of the analysis using GC-MS on n-hexane extract showed 2,4-di-tert-butylphenol and 9-octadecenoic acid. Diethyl ether extract contains 9-octadecenoic acid and mono (2-ethylhexyl) benzocarboxylic acid.  
Senyawa Bufadienolida yang bersifat Insektisida, Daigremontianin dari daun Cocor Bebek (Kalanchoe daigremontiana) Tri Mayanti; Desi Harneti Putri Huspa; Nurlelasari Nurlelasari; Agus Safari; Unang Supratman
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 (184.131 KB) | DOI: 10.15408/jkv.v2i2.200

Abstract

Dalam penelitian berkelanjutan untuk pencarian senyawa-senyawa yang bersifat insektisida daritanaman Kalanchoe (Cocor bebek) Indonesia, diperoleh hasil bahwa ekstrak metanol daun Cocorbebek (Kalanchoe daigremontiana) memberikan aktivitas insektisida yang kuat terhadap instar ke tigalarva ulat sutera (Bombyx mori). Ekstrak metanol yang diperoleh selanjutnya dipisahkan senyawasenyawanyamenggunakan partisi dengan pelarut organik dan kombinasi kolom kromatografi padasilika gel dan ODS sehingga dihasilkan satu senyawa aktif insektisida. Struktur kimia senyawa yangbersifat insektisida tersebut ditentukan dengan metoda spektroskopi dan perbandingan data spektrasenyawa analog yang telah diperoleh dari penelitian sebelumnya sehingga senyawa aktif insektisidatersebut diidentifikasikan sebagai senyawa turunan bufadienolida, daigremontianin. Daegremontianinmenunjukkan aktivitas insektisidal yang kuat terhadap instar ke tiga ulat sutera (Bombyx mori) denganLD50 0,9 μg/g diet.
Sintesis dan Karakterisasi Grafena dengan Metode Reduksi Grafit Oksida Menggunakan Pereduksi Zn Yudha Taufantri; Irdhawati Irdhawati; Ida Ayu Raka Astiti Asih
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.348 KB) | DOI: 10.15408/jkv.v2i1.2233

Abstract

Graphene is a thin material, has a hexagonal two-dimentional lattice and is considered as an interesting material for adsorption process. Nowadays, graphene has been known as a potential material for diverse application, such as adsorbent. In this study graphene was synthesized from graphite. Furthermore, graphene was applied for adsorption of dichloro diphenyl trichloroethane (DDT). Graphene was synthesized by Hummer’s method using hydrothermal and reduced by Zn. The samples were characterized by Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) methods. The results of the XRD showed graphene structure in the 2θ, appeared at 23.9369 with interlayer spacing was about 3.71763 Å, compared with graphite oxide structure in the 2θ appeared at 11.2055 with interlayer spacing was about 7.89649 Å. The results of SEM analysis showed graphene has one layer with planar hexagonal structure and seems transparent whose single layer and multi layers. The graphene adsorption was analyzed by using the UV-Visible spectrophotometer. The results indicated the surface area of graphene was shown as 46.8563 m2/g. The amount of DDT adsorbed by graphene during 15 minutes was 7.5859 mg/g. This adsorption mechanism of DDT and graphene might be due to π-π and hydrogen interactions.   Keywords: Adsorption, dichloro diphenyl trichloroethane (DDT), graphena. DOI: http://dx.doi.org/10.15408/jkv.v2i1.2233

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