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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 10 Documents

Search results for , issue "Jurnal Kimia VALENSI Volume 1, No. 2, November 2015" : 10 Documents clear

Aktivitas Antioksidan dan Kandungan Komponen Bioaktif Sari Buah Namnam Adawiah Adawiah; Dede Sukandar; Anna Muawanah
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Antioxidant is a compoud inhibit that have an important role in protecting health due to it can absorb free radical molecules and inhibit oxidative reaction which cause anykinds of diseases. This study aims to determine the chemical compositition and antioxidant activity of namnam juice, characteristic of namnam. In this experimental, proximat analysis, TPC, TFC, Vitamin C, antioxidant activity were evaluated. Namnam juice contains 996.03 mg/L of phenolics, 421.09 mg/Lof flavonoids, 121.44 mg/100mL of vitamin C and high antioxidant activity with IC50 5µL/mL.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3155.

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

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

Kinerja Biosensor Konduktometri Berbasis (Screen Printed Carbon Electrode) SPCE––Kitosan untuk Deteksi Diazinon, Malation, Klorpirifos dan Profenofos Nuzulul Kurniawan Isvani; Ani Mulyasuryani; Sasangka Prasetyawan
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

The performance of biosensor is based on the hydrolysis reaction of organophosphorus compounds catalyzed by organophosphate hydrolase (OPH), produce H+ and the other ionic species that increase conductance on the surface of electrode. In this research, OPH was immobilized by crosslinking on chitosan–glutaraldehyde membrane on the (Screen Printed Carbon Electrode) SPCE surface. Measurements were carried out at the range concentration 0 to 3.0 ppm of organophosphate, the range of pH 7.0 to 9.0 and 5–25 mL of enzyme. The result showed that optimum performances were obtained at 25 mL of OPH, pH 8.5, with the sensitivity for dizinon, malathion, chlorpirifos and profenofos is 1.353 mS/ppm, 1.270 mS/ppm, 1.230 mS/ppm dan 1.77 mS/ppm respectively and 0.97; 1.03; 0.98; 0.97 of LOD. DOI :http://dx.doi.org/10.15408/jkv.v0i0.3156.

Penentuan Hidrokuinon dalam Sampel Krim Pemutih Wajah secara Voltammetri Menggunakan Screen Printed Carbon Electrode (SPCE) Ani Mulyasuryani; Alfita Savitri
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Hydroquinone in whitening face cream has been banned since 2008, but is still found facial bleaching creams containing hydroquinone. Therefore, in this study have been developed voltammetric method for the determination hydroquinone in face whitening cream. This study has been carried out optimization of pH and measurement conditions. Optimizationof pH has been done in cyclic voltammetry, while the optimization of measurement carried out by differential pulse voltammetry. In this study, using a screen printed carbon electrode with a three electrode system. The results showed that the increase in pH causes a decrease in the anodic peak potential (Epa) of hydroquinone. The optimum conditions resulted at pH 2 in which the anodic current (Ipa) is the highest. The optimum condition resulted at high pulse 200 mV and scan rate at 15 mV/sec. The linear regression concentration is 1-100 μM, limit of detection is 0.015 μM and sensitivity is 0.0652 μM/µA. The results showed that the concentration of hydroquinone in the face whitening cream samples ranged from 0 to 0.02%DOI :http://dx.doi.org/10.15408/jkv.v0i0.3145.

Preparation and Characterization Of Co3O4 Nano Powder Pepi Helza Yanti; Akmal Mukhtar; . Astarina
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Synthesis of Co3O4 has been done using Co(NH3)4.6H2O and KOH as precursors with molar ratio 1:1 M with precipitation method. Several of calcination temperature were done to learn type of mineral phase and crystalinity of Co3O4 synthesized. The XRD analysis revealed that calcination temperature influence crystalinity and mineral phase of Co3O4 prepared and calcination temperature at 700 oC has highest intensity and crystalinity that others. Analysis of particle size was examined using Schererr equation, and the results showed that particle size decrease with calcination temperature. The particle size at 700 oC was = 32.387 nm. Analysis morphology of Co3O4 was examined using SEM technique, and the result revelaed Co3O4 have nearly spherical.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3176.

Karakterisasi Karbon Aktif Asal Tumbuhan dan Tulang Hewan Menggunakan FTIR dan Analisis Kemometrika Yusraini Dian Inayati Siregar; Rudy Heryanto; Nur Lela; Tri Heny Lestari
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Activated carbon is widely used as an adsorbent in gas purification, refining pulp, and also for the purification of food products, among others, oil purification, refining cane sugar, beet sugar, corn sugar, eliminate the taste and odor of drinking water. Carbon active can be derived from plant and animal bone. This study aims to analyze the differences in spectral profile of activated carbon from plants and animal bones by using FTIR. The data combined with the results of FTIR analysis chemometrics to classify and categorize the data, so it is clear where the activated carbon from plants and animal bones. FTIR analysis methods combined with chemometrics analysis through modeling PCA (Principal Component Analysis) and PLS-DA (Partial Least Squares-Discriminant Analysis) is able to distinguish between activated carbon derived from plants (coconut shell) and animal bones (beef and pork). PCA with total diversity of 89% were able to classify the samples of activated carbon plant and animal bones. PLSDA models successfully predicted the test sample is based on a sample group of activated carbon raw material. Manufacture of activated carbon predictive models with PLS calibration generates R2, R2 predictions, RMSEC, and RMSEP respectively by 0.9787389, 0.9662152, 0.0687364 and 0.0928362. The results showed that FTIR spectra and can be used to distinguish chemometrics activated carbon derived from plant and animal bonesDOI :http://dx.doi.org/10.15408/jkv.v0i0.3146.

Sintesis dan Karakterisasi Polianilina Doping Asam Klorida dengan Metode Interfasial Iman Rahayu; Annisa Wijayati; Sahrul Hidayat
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

The growing interest in nanostructured conducting polymers is caused by expanding area of their practical application. Conducting polymers can be used in new electronic devices (transistors, displays, sensors, energy storage and memory cells), materials for shielding electromagnetic irradiation, inhibition of corrosion, membrane constructing, catalysis and medicine. The studies of polyaniline (PANI) and other conducting polymers have shown that they possess semiconducting properties. Due to its high stability and unique complex of properties, PANI was the first among conducting polymers to be used in practice as an electrode material for batteries, as a corrosion inhibitor and detecting material for sensors. PANI without dopant material possesses controlled conductivity 10-10 S∙cm-1. PANI was synthesized by the interfacial method by oxidation of aniline with ammonium peroxydisulfate (APS) as an oxidant in an immiscible organic/aqueous biphasic system, with hydrochloric acid as dopant. An organic phase contained aniline dissolved in toluene, while the oxidant was dissolved in acid. The produced PANIs have conductivities in the range 0.03-0.07 S.cm−1. Their nanofiber morphology was confirmed by scanning electron microscopy (SEM). Molecular structure of synthesized PANIs was investigated by FTIR Spectroscopy. DOI :http://dx.doi.org/10.15408/jkv.v0i0.3143

Peningkatan Mutu Briket dari Sampah Organik dengan Penambahan Minyak Jelantah dan Plastik High Density Polyethylene (HDPE) Silvia Septhiani; Eka Septiani
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 | DOI: 10.15408/jkv.v0i0.3567

The objective of this research was to looking for the alternative fuel to overcome the limitations of natural resources by using organic garbage and to investigate the improvement quality of biobriket after HDPE and cooking oil addition. Making biobriket with carbonitation organic garbage was a method that is used. The result of the research suggests that the quality of biobriket increased after HDPE and cooking oil addition. The analysis of water biobriket showed that HDPE was decreased from 13.99% to 13.88% and biobriket of cooking oil is 9.39%. More over the decreasing also happened to the content of the ash, from 25% to 23% biobriket HDPE and 20% to biobriket of cooking oil. Calorific biobriket 4703.27 cal/g, the increasing of HDPE biobriket was 5009.16 cal/g and biobriket of cooking oil 6245.66 cal/g. DOI :http://dx.doi.org/10.15408/jkv.v0i0.3567.

Penggunaan Parameter Geokimia Isoprenoid untuk Menentukan Tingkat Kematangan Minyak Bumi (Crude Oil) Sumur Minyak Langgak Riau Emrizal Mahidin Tamboesai
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 | DOI: 10.15408/jkv.v0i0.3142

In this study, crude oil samples from Distric Langgak, Riau were tested and characterized with isoprenoid parameters. Determination of thermal maturity level aims to determine the feasibility of petroleum wells to be exploited because there are many new wells of petroleum unexploited in the Riau area. Determination of maturity crude oil performed by analysis saturated fractions. Saturated fraction of the wells Langgak used to determine the maturity of crude oil based on parameters isoprenoid, n-alkane and carbon preference index were analyzed using gas chromatography-flame ionize detector (GC-FID). Based on the value Pr / Ph, Pr / n-C17, Ph / n-C18 and its CPI, the maturity level of petroleum from oil wells, Langgak levels of maturity and quality of the oil is indicated by the value of Pr / Ph (2.27), the value of Pr / n-C17 (0.57), the value of Ph / n-C18 (0.22) and the CPI (1.087) respectively.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3142

Sintesis Nanomaterial Mangan Oksida dengan Metode Bebas Pelarut Nanda Saridewi; Syukri Arif; Admin Alif
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 | DOI: 10.15408/jkv.v0i0.3147

Manganese dioxide (MnO2) known as manganese oxide which has a variety polimorfi crystal structure, such as β-, α-, δ- and γ- MnO2. Each of manganese oxide material comprises a tunnel structure. With the structure of the tunnel which is owned by manganese oxide material is widely used as selective catalysts, ion exchange, and the exchange of molecules. Manganese oxide is synthesized using free methods solvent. Synthesis process is performed with a temperature variation of 90, 120, and 150 °C. The results was characterized by XRD and SEM. XRD diffraction patterns produced showed that the manganese oxide that is formed is a β-MnO2 (pyrolusite) with an optimum temperature of 120 °C. The resulting material also has a range of nanoparticles that reach 14:08 nm crystal size. Mangan shaped morphology produced oxide can degrade dye rhodamine B.DOI: http://dx.doi.org/10.15408/jkv.v0i0.3147.

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Dr. Sandra Hermanto, M.Si

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Program Studi Kimia, Fakultas Sains dan Teknologi, UIN Syarif Hidayatullah Jakarta

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Dr. Sandra Hermanto, M.Si

Contact Email hermantokimia@uinjkt.ac.id

Phone +6285220042401

Journal Mail Official kimia@uinjkt.ac.id

Editorial Address Program Studi Kimia, Fakultas Sains dan Teknologi, UIN Syarif Hidayatullah Jakarta

Location Kota tangerang selatan, Banten INDONESIA

Abstract

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Abstract

Contact Name
Dr. Sandra Hermanto, M.Si

Contact Email
hermantokimia@uinjkt.ac.id

Phone
+6285220042401

Journal Mail Official
kimia@uinjkt.ac.id

Editorial Address
Program Studi Kimia, Fakultas Sains dan Teknologi, UIN Syarif Hidayatullah Jakarta

Location
Kota tangerang selatan,

Banten

INDONESIA