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Jurnal Ilmu Kimia Universitas Brawijaya
Published by Universitas Brawijaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Arjuna Subject : -
Articles 214 Documents
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STUDI PENGARUH KONSENTRASI HCl DAN WAKTU AGING (PEMATANGAN GEL) TERHADAP SINTESIS SILIKA XEROGEL BERBAHAN DASAR PASIR KUARSA BANGKA Meirawati, Dian; Wardhani, Sri; Tjahjanto, Rachmat Triandi
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Synthesis and characterization of silica-based xerogel Bangka quartz sand has been done through the sol-gel method. Synthesis is done with the first is the manufacture of sodium silicate precursor and then the addition of HCl to pH 1 and the addition of 1M NaOH to pH 7 for sol formation, Aging then performed gel (gel aging) as a polymerization reaction completion. HCl concentration and aging time are used respectively - were 0.5, 1 and 2 M then 12, 18 and 24 hours. Gel that had formed was washed with distilled water and printed in the syringe then dried in an oven for 18 hours at a temperature of 80 0C. Based on the test results the surface area of ​​the methylene blue is the optimum condition in 0.5 M HCl and aging time of 12 hours. The surface area of ​​the silica xerogel is  9.060 m2g-1. Characterization by FTIR showed wide uptake in wave numbers 3468.84 cm-1 is the OH groups of Si-OH and Si-O of Si-O-Si in the wave number 1080.06 cm-1. XRD results produce is amorphous silica xerogel.   Keywords: Sol-gel, Sodium silicate, xerogel.
PENGARUH VARIASI TEMPERATUR TERHADAP SINTESIS SENYAWA ORGANONITROGEN BERBASIS α-PINENA DARI HASIL ISOLASI MINYAK TERPENTIN Meiliyanto, Rendra Yudantara; Rahman, Mohammad Farid; Utomo, Edi Priyo
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Telah dilakukan sintesis senyawa organonitrogen dari bahan dasar α-pinena hasil isolasi dari minyak terpentin. Sintesis dilakukan  dengan variasi temperatur  yaitu (-15) – (-10) °C, 27 °C dan 90 °C. Pemilihan temperatur tersebut bertujuan untuk membandingkan senyawa produk organonitrogen yang terbentuk. α-Pinena diisolasi dari minyak terpentin dengan metode distilasi fraksinasi menggunakan pengurangan tekanan, diperoleh kadar kemurnian sebesar 88,46 %. Reaksi Ritter ini menghasilkan senyawa yang beragam, akibat adanya penataan ulang posisi karbokation pada struktur α-pinena. Produk utama yang dihasilkan berupa N-(1,7,7-trimetilbisiklo[2.2.1]heptan-2-il)asetamida; N-(2-(4-metilsikloheks-3-enil)propan-2-il)asetamida dan N-(2,6,6-trimetil bisiklo[3.1.1]heptan-2-il)asetamida. Secara umum, semakin bertambahnya temperatur maka akan meningkatkan energi molekul untuk melakukan reaksi. Akan tetapi senyawa yang terbentuk juga dipengaruhi oleh kestabilan strukturnya.
PENGARUH pH DAN TEMPERATUR TERHADAP KINERJA ELEKTRODA SELEKTIF ION Cd(II) TIPE KAWAT TERLAPIS BERBASIS D2EHPA Maulidyawati, Titin; Atikah, Atikah; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Pengaruh pH dan temperatur terhadap kinerja elektroda selektif ion (ESI) Cd(II) tipe kawat terlapis berbasis D2EHPA telah dipelajari. ESI Cd(II) tipe kawat terlapis dibuat dari kawat platina (Pt) dilapisi membran yang tersusun atas D2EHPA sebagai ionofor, berpendukung campuran polimer PVC dan pemlastis DBP dengan perbandingan % b/b = (16:28:56) yang dilarutkan dalam pelarut tetrahidrofuran (THF) (1:3 b/v). ESI Cd(II) tipe kawat terlapis berbasis D2EHPA menunjukkan sifat Nersntian dengan harga faktor Nernst 27,70 mV/dekade konsentrasi, rentang konsentrasi linier 1x10-5 – 1x10-1 M, limit deteksi 6,6x10-6 M atau setara dengan 0,316 ppm, waktu respon 40 detik serta usia pemakaian 42 hari. Penentuan pengaruh pH dilakukan dengan mengukur potensial larutan CdCl2 dengan konsentrasi 1x10-5 – 1x10-1 M pada pH 3, 4, 5, 6 dan 7 menggunakan bufer asetat. Pengaruh temperatur dipelajari dengan mengukur potensial larutan CdCl2 dengan rentang konsentrasi 1x10-5 – 1x10-1 M pada variasi temperatur (20, 25, 30, 35, 40, 45, 50, 55 dan 60)°C. Hasil penelitian menunjukkan bahwa ESI Cd(II) tipe kawat terlapis dapat digunakan pada rentang pH 4 – 6 dan temperatur 20 – 50°C. Kata kunci: D2EHPA, ESI tipe kawat terlapis, kadmium, membran, potensiometri
PENGARUH ION ASING TERHADAP KINERJA ELEKTRODA SELEKTIF ION (ESI) Cd(II) TIPE KAWAT TERLAPIS BERBASIS D2EHPA SERTA APLIKASINYA PADA PENENTUAN KADAR KADMIUM DALAM AIR SUNGAI Wijanarko, Aris; Atikah, Atikah; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Elektroda Selektif Ion (ESI) Cd(II) tipe kawat terlapis dibuat menggunakan bahan aktif D2EHPA, campuran polivinilklorida (PVC) sebagai bahan pendukung, Dibutylphthalate (DBP) sebagai bahan pemlastis, dengan perbandingan D2EHPA : PVC : DBP = 16 : 28 : 56 dalam pelarut tetrahidrofuran (THF) (1:3 b/v). ESI Cd(II) tipe kawat terlapis berbasis D2EHPA menunjukkan harga faktor Nernst 27,26 mV/dekade konsentrasi Cd(II) pada rentang konsentrasi 1x10-5 – 1x10-1 M, limit deteksi 6,61x10-6 M atau setara dengan 0,317 ppm kadmium dengan waktu respon 40 detik dan usia pemakaian 42 hari. Penelitian ini bertujuan untuk mempelajari pengaruh ion asing terhadap kinerja ESI Cd(II) tipe kawat terlapis berbasis D2EHPA serta diaplikasikan pada penentuan kadar kadmium dalam air sungai. Pengaruh ion asing dilakukan dengan menentukan koefisien selektivitas (Ki,j) menggunakan metode larutan tercampur. Larutan yang diukur mengandung ion utama Cd2+dengan rentang konsentrasi 1x10-5 – 1x10-1 M dan ion asing Hg2+dan Cu2+dengan konsentrasi tetap 1x10-3 M. Aplikasi pada penentuan kadar kadmium secara potensiometri menggunakan ESI Cd(II) tipe kawat terlapis berbasis D2EHPA hasilnya dibandingkan dengan metode standar Spektrofotometer Serapan Atom (SSA)  menggunakan uji t. Hasil penelitian menunjukkan keberadaan ion asing Hg2+ dan Cu2+ tidak mempengaruhi kinerja ESI Cd(II). Urutan selektivitas ESI Cd(II) tipe kawat terlapis berbasis D2EHPA yaitu Cd2+ > Hg2+ > Cu2+, Berdasarkan hasil uji t pengukuran Cd(II) menggunakan metode potensiometri dengan ESI Cd(II)tipe kawat terlapis berbasis D2EHPA tidak berbeda secara bermakna dengan hasil pengukuran menggunakan metoda SSA sehingga dapat digunakan sebagai metoda alternatif untuk  pengukuran kadar kadmium dalam air sungai. Kata kunci: D2EHPA, elektroda selektif ion tipe kawat terlapis, membran, potensiometri, sensor potensiometri kadmium.
PEMBUATAN ELEKTRODA SELEKTIF ION KADMIUM TIPE KAWAT TERLAPIS BERMEMBRAN D2EHPA Putra, Dedi Arta; Atikah, Atikah; Sulisyarti, Hermin
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABStract Preparation  of coated wire cadmium(II) ion selective electrodes Cd(II) CWE) membranous Di (2-Ethyl Hexyl) Phosporic Acid (D2EHPA) has been done to obtain the optimum membrane composition ratio and optimum soaking time that produce cadmium(II) CWE have Nerntstian character. Preparation  of cadmium(II) CWE was conducted by three kinds of membrane composition comprising an active ingredient D2EHPA, matrix material consist of polyvinylchloride (PVC) polymer and plasticizer dibutylphtalate (DBP) dissolved in tetrahydrofuran (THF) solvent with a ratio of 1:3 by weight/volume. Potential measurements made​​ in the CdCl2test solution in the concentration range10-8-10-1M at pH 5. Optimization of time soaking in a solution of CdCl2 0.1M performed at optimum membrane composition in the time range of 0-80 minutes with 10 minutes intervals. The results showed that the optimum composition of the membrane is a membrane with the composition ratio  of D2EHPA : PVC : DBP = 16 : 28 : 56 produces Nernstian properties with prices Nernst factor of 27.26mV/decade of concentration needed optimum soaking time in a solution of CdCl2 0.1M for 20 minutes.   Key words: cadmium CWE, D2EHPA, membrane, potentiometry
KARAKTERISASI ELEKTRODA SELEKTIF ION (ESI) KADMIUM TIPE KAWAT TERLAPIS BERMEMBRAN D2EHPA Kusrini, Endah; Atikah, Atikah; Sulisyarti, Hermin
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABStract Determination of the basic characters of coated wire cadmium ion selective electrode (Cd CWE) which have performed include Nernst factor, linear concentration range, limit of detection, response time and life time. Potensial measurements were performed using optimum membrane composition comprising active ingredients of Di(2-Ethyl Hexyl)Phosporic Acid (D2EHPA) : Polyvinylchloride (PVC) : Di-butyl Pthalate (DBP) with % w/w ratio 16:28:56 dissolved in tetrahydrofuran (THF) at ratio of 1:3 (w / v) in the test solution of CdCl2 1x10-8 - 1x10-1 M at pH 5 and optimum soaking time of 20 minutes. The result showed that Cd(II) CWE is being made demonstrated Nernstian with Nernts factor of 27.7±0.267  mV / decade of cadmium(II) at linear concentration range from 1x10-5 to 1x10-1 M or 1.46 to 14600 ppm, detection limit of 6.607 x10-6 M or 0.317 ppm, response time of 40 seconds and life time of 42 days. Reproducibility production of 3 Cd(II) CWE is well shown by the price of a standard deviation (SD) and coefficient of variation (CV) were respectively 0.264 and 0.953%.   Key words: characterization, D2EHPA, ESI cadmium, membrane coated wire
ISOLASI DAN KARAKTERISASI KOMPONEN MINYAK MINT DARI DAUN Mentha arvensis Linn. HASIL DISTILASI AIR Hidayat, Fahmi; Retnowati, Rurini; Soebiantoro, Soebiantoro
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Tanaman Mentha termasuk dalam keluarga Labiatae, yang banyak dimanfaatkan minyak atsirinya berdasarkan penggunaan dalam berbagai bidang industri, kandungan bahan aktif dan aroma. Pada penelitian ini bertujuan untuk mengisolasi minyak mint dari daun Mentha arvensis segar yang berasal dari Pujon, Batu, Indonesia dengan metode distilasi air, mengkarakterisasi sifat fisik dan menganalisa komponen penyusun minyak mint. Isolasi minyak mint dengan metode distilasi air dari daun M. arvensis diperoleh minyak mint dengan rendemen sebesar 0,09 %, berwarna kuning, berbau menyengat, beraroma khas daun mint, indeks bias 1,468 (25 0C) dan berat jenis 0,899 (25 0C). Hasil analisis minyak mint dengan KG-SM menunjukkan adanya 28 senyawa penyusun minyak mint dengan 5 komponen utama penyusunnya adalah karvon (40,58 %), limonena (19,55 %), β-mirsena (4,10 %), tran-karveol (3,39 %) dan dihidrokarvon (3,01 %). Komponen penyusun minyak mint pada penelitian ini berbeda dengan komponen minyak mint yang berasal dari Patiala, India. Kata kunci: Distilasi air, Mentha arvensis, minyak mint, KG-SM. ABStract Mentha plant has been determined as Labiatae family. The essential oil isolated from this plant has been widely used in various industrial application taking the advantages of its biologically active compounds and fragrances. This study is aimed to isolate mint oil from Mentha arvensis leaves freshly collected from Pujon, Batu, Indonesia, through water-distillation method, characterize its physical properties and analyze its compounds. Mint oil in this reseacrh was obtained in 0.09 % yield, yellow in color, has strong and characteristic odour as typical mint leaves, refractive index of 1.468 (25 oC) and specific gravity of 0.899 (25 oC). Analysis by GC-MS of this mint oil has shown that it consists of 28 compounds with the 5 major compounds are carvone (40.58 %), limonene (19.55 %), β-myrcene (4.10 %), trans-carveol (3.39 %) and dihydrocarvone (3.01 %). The composing components of mint oil in this research is found to be different with that of isolated from Patiala, India. Key words: Water distillation , Mentha arvensis, mint oil, GC-MS.
ISOLASI DAN KARAKTERISASI TERHADAP MINYAK MINT DARI DAUN MENTHA ARVENSIS SEGAR HASIL DISTILASI UAP-AIR Toepak, Erwin Prasetya; Retnowati, Rurini; Masruri, Masruri
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Minyak mint yang berasal dari Mentha arvensis banyak digunakan sebagai bahan baku dalam industri makanan, kosmetik, dan farmasi. Penelitian ini bertujuan untuk mengisolasi dan mengkarakterisasi minyak mint dari daun segar Mentha arvensis. Isolasi minyak mint dilakukan dengan metode distilasi uap air selama 4 jam, sedangkan karakterisasi sifat fisik ditentukan berdasarkan  warna, bau, indeks bias, dan massa jenis. Komponen penyusun minyak mint dianalisis menggunakan Kromatografi Gas-Spektroskopi Massa (KG-SM). Hasil penelitian menunjukkan bahwa minyak mint yang diperoleh berwarna kuning muda dengan bau yang menyengat,  rendemen 0,06 %, memiliki indeks bias 1,463 (20 oC), dan massa jenis sebesar 1,126 g/mL  (25 oC). Hasil analisis dengan KG-SM menunjukkan adanya 25 komponen penyusun minyak mint, dengan komponen terbesar yaitu karvon (52,46 %). Letak geografis tumbuhnya M. arvensis diduga mempengaruhi senyawa penyusun minyak mint.   Kata kunci : disitlasi uap-air, KG-SM, Mentha arvensis , minyak mint. ABStract Mint oil from Mentha arvenis many uses as raw material in food, cosmetic, and pharmaceutical indsutries. This research were aims to isolate and to characterize the mint oil from fresh leaf of Mentha arvensis. Isolation of mint oil was carried out using water-steam distillation for 4 hours, while the physical properties characterization determined based on colour, odour, the refractive index and density. The chemical component of mint oil was analyzed using Gas Chromatography-Mass Spectroscopy (GC-MS). The experiment result showed that mint oil is light yellow liquid with strong odour and the yield of mint oil is 0.06% , refractive index value is 1.463 (20 oC), and density is 1.126 g/mL (25 oC). The results of GC-MS analyzing showed that mint oil contain 25 chemical components, with the major components are carvone (52.46 %). Geographical location of M. arvensis growing might be predicted can affect the compounds of mint oil. Key words: GC-MS, mint oil, Mentha arvensis , steam-water distillation.
ISOLASI DAN KARAKTERISASI TERHADAP MINYAK MINT DARI DAUN MINT SEGAR HASIL DISTILASI UAP Aziza, Siti Alfisyah Nur; Retnowati, Rurini; Suratmo, Suratmo
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Minyak mint dapat digunakan sebagai bahan baku industri makanan, minuman, dan farmasi. Penelitian ini bertujuan untuk mengisolasi minyak mint dari daun mint (Mentha arvensis Linn) segar dilakukan dengan metode distilasi uap selama 1 jam, mengkarakterisasi sifat fisik, dan menganalisis komponen penyusun minyak mint menggunakan Kromatografi Gas-Spektroskopi Massa (KG-SM). Minyak mint yang dihasilkan berwarna kuning muda dengan rendemen 0,03 %, indeks bias 1,4701 (25 oC), dan massa jenis 1,1363 g/mL (25 oC). Hasil analisis komponen penyusun minyak mint menggunakan KG-SM menunjukkan bahwa terdapat 37 komponen, dan terdapat 3 komponen utama dalam minyak mint yaitu karvon (30,89 %), piperitenon oksida (14,58 %), dan bornilen (12,75 %). Kata kunci: distilasi uap, Kromatografi Gas-Spektroskopi Massa, Mentha arvensis Linn, minyak mint ABSTRACT Mint oil can be used as raw material for food, beverage, and pharmaceutical industries. The aims of this research is to isolate mint oil from fresh mint (Mentha arvensis Linn) leaves using steam distillation method for 1 hours, to characterize the mint oil is based on its physical properties, and to analyze its chemical compounds using Gas Chromatography-Mass Spectroscopy (GC-MS). The isolation result showed that mint oil is yellow with pungent odour and the yield of mint oil is 0.03 %, refractive index value is 1.4701 (25 oC), and density 1.1363 g/mL (25 oC). GC-MS analysis result showed that the oil contained of 37 components and the 3 main components is carvone (30.89 %), piperitenone oxide (14.58 %), and bornylene (12.75 %).   Keywords: Gas Chromatography-Mass Spectroscopy, Mentha arvensis Linn, mint oil, steam distillation
Labelling Antibodi Anti-TPO Menggunakan Alkaline Phosphatase (AP) Untuk Deteksi Autoantibodi TPO Pada Serum Pasien Autoimmune Thyroiditis Disease (AITD) Menggunakan Dot-Blot Nurmahdi, Hilman; Aulanni'am, Aulanni'am; Mahdi, Chanif
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Autoimmune thyroiditis disease (AITD) is an organ specific autoimmune disorder which commonly found in the world. Presence of Thyroid Peroxidase (TPO) enzyme in AITD patient is often used as biomarker in AITD diseases. The aims of this research is done by labelling a polyclonal antibody against autoantibody TPO using Alkaline Phosphatase that used to detect autoantibody TPO in AITD patient using direct Dot Blot method. The protein of Autoantibody TPO is isolated from human AITD sera and has molecular weight of 51.1 kDa. This has been confirmed by western blot using monoclonal antibody standard for TPO. Autoantibody TPO is used as an antigen to produce polyclonal antibody against autoantibody TPO in rabbbit (Oryctolagus cuniculus).  The result of this research shown that autoantibody TPO is immunogenic that could stimulate immune system to produce polyclonal antibody against autoantibody TPO. The highest titer of polyclonal antibody against autoantibody TPO from rabbit sera has optical density of 1,75 using ELISA method. The result of Dot Blot showed that polyclonal antibody which labelled with Alkaline Phosphatase, is able to recognize autoantibody TPO  in patient sera and have the highest colour intensity on the third bleeding.Key words : AITD, Alkaline Phospahatase, autoantibody TPO, Dot Blot, ELISA

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