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INDONESIA
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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EKSTRAKSI SILIKA DALAM LUMPUR SIDOARJO MENGGUNAKAN METODE KONTINYU Fadli, Agus Farid; Tjahjanto, Rachmat Triandi; Darjito, Darjito
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Tujuan dari penelitian ini adalah mempelajari pengaruh konsentrasi dan laju alir pelarut KOH yang digunakan untuk mengekstraksi silika dalam lumpur Sidoarjo. Kandungan silika merupakan mayor elemen di dalam lumpur Sidoarjo sehingga dapat digunakan sebagai sumber silika.Lumpur Sidoarjo dicuci menggunakan akuades dan direndam dalam larutan HCl 2 M untuk menghilangkan impuritas selain silika didalam lumpur Sidoarjo yang kemudian dikeringkan dengan temperatur 110 °C sebagai sampel. Untuk proses ekstraksi, KOH dialirkan dengan laju alir tertentu ke dalam fasa padat sampel lumpur Sidoarjo sehingga didapatkan larutan kalium silikat yang kemudian dikondisikan dalam suasana asam sampai pH 4 membentuk endapan amorf silika. Konsentrasi larutan KOH yang digunakan sebesar 1, 3, 5, 7, dan 10 M sedangkan laju alir yang digunakan sebesar 2, 4, dan 6 mL/menit. Dari hasil penelitian, didapatkan konsentrasi KOH maksimum sebesar 10 M dan laju alir maksimum sebesar 2mL/menit dengan jumlah silika yang terekstrak sebesar 1,8052 g.Kata kunci: laju alir, lumpur Sidoarjo, silika
AKTIVITAS ANTIOKSIDAN DARI MINYAK BUNGA CENGKEH (Syzygium aromaticum) KERING BERDASARKAN AKTIVITAS ANTIRADIKAL YANG DITENTUKAN MENGGUNAKAN Electron Spin Resonance Nurjannah, Dian Ayu; Retnowati, Rurini; Juswono, Unggul Pundjung
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Pada penelitian ini, dilakukan uji aktivitas antiradikal terhadap minyak cengkeh. Minyak cengkeh yang digunakan diperoleh dari hasil isolasi bunga cengkeh menggunakan distilasi uap selama 8 jam dan dilakukan karakterisasi menggunakan Kromatografi Gas-Spektroskopi Massa (KG-SM). Uji aktivitas antiradikal menggunakan Electron Spin Resonance (ESR) dilakukan terhadap radikal bebas dalam minyak jagung yang telah diradiasi dengan sinar UV pada λ= 254 nm selama 40 menit dengan variasi penambahan volume minyak cengkeh sebanyak 45, 50, 55, 60, 65 µL. Hasil penelitian menunjukkan bahwa volume minyak cengkeh mempengaruhi aktivitasnya sebagai antiradikal. Aktivitas optimal antiradikal minyak cengkeh terhadap radikal alkil (60%), hidroksil (48,57%), dan peroksil (35,71%) diperoleh pada penambahan 55 µL minyak cengkeh. Penurunan luas kurva resonansi minyak cengkeh dan eugenol hampir sama, sehingga senyawa yang diduga berkontribusi pada aktivitasnya sebagai antiradikal adalah eugenol. Kata kunci: antiradikal, Electron Spin Resonance, minyak cengkeh
PENGARUH PENAMBAHAN ION Fe3+ TERHADAP AKTIVITAS XILANASE DARI Trichoderma viride Sulistyaningtyas, Ardyan Sukma; Prasetyawan, Sasangka; Sutrisno, Sutrisno
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Xylanase is an enzyme that catalyzes the hydrolysis reaction substrate xylan (hemicellulose) into xylose. This study was conducted to determine the effect of Fe3+ on the activity of xylanase from Trichoderma viride using corn strove as an inducers. Effect of the addition of Fe3+ ions on xylanase activity was determined by comparing the xylanase activity with the addition of Fe3+ ions and xylanase activity without the addition of Fe3+ ions. Xylanase activity was determined by measuring the reducing sugar xylose spectrophotometrically using 3,5-dinitrosalisilat acid reagent (DNS). The results showed that the addition of Fe3+ ions in the concentration range of 5-35 mM can increase the activity of xylanase Keywords: Xylanase, Fe3+, Trichoderma viride, Corn Strove
OZONISASI EMAS DALAM LARUTAN NaCl Sensustania, Herinda; Tjahjanto, Rachmat Triandi; Purwonughroho, Danar
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

The aim of research about gold ozonation in NaCl solution are to determine whether gold in NaCl solution can be oxidized by ozone. In addition to know the effect of pH NaCl solution to gold ozonation. In this studied gold was ozonized for four hours at different pH of the solution. The result of this research shows that gold can be oxidized to Au3+ on the conditions used. Based on the results, it can be concluded that pH of the NaCl solution having an effect on gold ozonation. The maximum gold oxidation was occured in NaCl solution 3 M at pH 0.   Keywords: ozonation, gold, oxidation, sodium chloride, pH
ISOLASI DAN KARAKTERISASI TIROSIN KINASE HASIL ISOLASI SPERMATOZOA TIKUS (Rattus norvegicus) Nirbaya, Rara Anggun Mei; 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

Tyrosine kinase is an enzyme that is used to transfer phosphate. Tyrosine kinase activity is important in the process of autofosforilasi sperm and its activities will be maximum when the working conditions of optimum. Purpose of this study was to determine the caracteristic and molecular weigh tyrosine kinase isolated spermatozoa rat. Tyrosine kinase isolated from spermotozoa rat (Rattus norvegicus) by centrifugation and ultrasonikasi technique. In this research experiment of conditions optimum tyrosine kinase with variations of pH ( 6; 6,5; 7; 7.5 and 8), temperature ( 20; 25; 30; 35 and 40 )0C, incubation periods ( 20; 25; 30; 35; and 40 ) minutes, and for the determination of molecular weight used method of SDS-PAGE. The result of this research showed that the optimum activity tyrosine kinase from spermmatozoa rat (Rattus norvegucus) at pH 7, temperature 350C, and 30 minutes incubation time with 0,263 unit activity and obtained by molecular weight 94,61 kDa. The result of statistic analyzed showed the variation of pH, temperature, and incubation time give an very obvious influence (P<0,01) against activity of tyrosine kinase. Keywords: molecular weight tyrosine kinase, spermatozoa, tyrosine kinase activity
PENGARUH pH DAN WAKTU KONTAK PADA ADSORPSI Ni(II) MENGGUNAKAN ADSORBEN KITIN TERFOSFORILASI DARI LIMBAH CANGKANG BEKICOT (Achatina fulica) Ardhi, Tunjung Nourman Sasono; Darjito, Darjito; Tjahjanto, Rachmat Triandi
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Pemanfaatan kitin sebagai adsorben untuk limbah logam berat telah banyak dilakukan. Kitin dipilih karena ketersediaanya yang melimpah di alam. Penelitian ini bertujuan untuk menentukan kondisi optimum melalui variasi pH dan waktu kontak. Adsorben kitin diperoleh dari hasil isolasi limbah cangkang bekicot melalui proses deproteinasi dan demineralisasi. Proses fosforilasi dilakukan dengan menambahkan asam fosfat dan natrium bifosfat pada kitin. Hasil adsorpsi Ni(II) oleh kitin terfosforilasi dianalisis menggunakan Spektrofotometer Serapan Atom. Penelitian dilakukan dengan variasi pH 2, 3, 4, 5, 6, dan 7 serta variasi waktu kontak 40, 60, 80, 100, 120, dan 150 menit. Adsorpsi ion Ni(II) secara maksimum diperoleh pada pH 5 dan waktu kontak selama 80 menit dengan jumlah Ni(II) teradsorpsi sebesar 9,21 mg/g. Kata kunci: adsorpsi, fosforilasi, kitin, Ni(II).
PENGARUH pH , DAN WAKTU KONTAK PADA ADSORPSI Co(II) MENGGUNAKAN ADSORBEN KITIN TERFOSFORILASI DARI LIMBAH CANGKANG BEKICOT (Achatina fulica) Ariprismoyo, Lhuhur Sheto; Darjito, Darjito; Khunur, Muhammad Misbah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Kitin merupakan salah satu senyawa yang dapat digunakan untuk menyerap ion logam berat, Salah satu sumber kitin adalah dari limbah cangkang bekicot. Tujuan dari penelitian ini adalah untuk menentukan pH dan waktu kontak optimum terhadap adsorpsi ion Co(II) menggunakan adsorben kitin terfosforilasi. Kitin diperoleh dengan cara diisolasi dari cangkang bekicot dengan menggunakan proses deproteinasi dan demineralisasi. Proses fosforilasi dilakukan dengan menambahkan asam fosfat dan dinatrium hidrogen fosfat. Penelitian ini dilakukan dengan variasi pH 2, 3, 4, 5, dan 6, dan variasi waktu kontak 80, 100, 120, 140, dan 160 menit. Hasil dari penelitian ini menunjukkan bahwa pH optimum terjadi pada pH 5, dengan prosen adsorpsi Co(II) sebesar 52,40%, dan waktu kontak optimum adalah 120 menit dengan mg/g Co(II) teradsorpsi sebesar 9,42 mg/g. Kata kunci: adsorpsi, ion Co(II), kitin, kitin terfosforilasi
PENGARUH pH DAN WAKTU KONTAK PADA ADSORPSI Cd(II) MENGGGUNAKAN ADSORBEN KITIN TERFOSFORILASI DARI LIMBAH CANGKANG BEKICOT (Achatina fulica) Hanjaya, Sasmita; Darjito, Darjito; Purwonugroho, Danar
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Abstract The adsorbent of Cd(II) ion from snail shell (Achatina fulica) waste had been made in this research. The aim of this research were to know the effect of pH and contact length on adsorption Cd(II) ions using phosphorylated chitin. The chitin from snail shell was characterized by FTIR and deacetylation degrees was counted. Bacth method was used to adsorp Cd(II) ion with pH variation (3, 4, 5, 6, 7) and contact length (30, 60, 90, 120, 150 minutes). Then the adsorption results was measured with Atomic Absorption Spectroscopy (AAS). The results showed that adsorbent had  deacetylation  degree  of  46.772%. Optimum  condition of pH and contact lengh were occured by 4 and 60 minutes with 92.3% and 75.3% respectively present of Cd(II) adsorption. Keywords: adsorption, cadmium, chitin, phosphorylated, snail shells.
PENGARUH pH DAN ION ASING TERHADAP KINERJA ELEKTRODA SELEKTIF ION (ESI) TIMBAL (II) TIPE KAWAT BERBASIS PIROPILIT TERLAPIS UNTUK MENENTUKAN KANDUNGAN TIMBAL DALAM KOSMETIK Rosemiyani, Ika; Fardiyah, Qonitah; Rumhayati, Barlah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRACT Lead (II) Ion Selective Electrode (ISE) based on pyrophyllite as ionofor has been developed, previously. 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 pH and interfering ions to the performance of the Lead (II) ISE based pyrophyllite coated wire type. The effects of pH was determined by measuring potential response of lead solution buffered by acetate solution at pH 3-7. The selective coefficients (kij) were determined using the mix solution methode  at  10-3 M of interfering ion. The result showed that the Lead (II) ISE based pyrophyllite coated wire type could be used optimally at  pH 5. The Lead (II) ISE 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 Lead (II) ISE based pyrophyllite coated wire type with selectivity order of Pb2+> Hg2+> Cr3+> Na+. The Lead (II) ISE based pyrophyllite coated wire type could be applied for determination lead in cosmetic samples, with precision of 95.42% and accuracy of 96.49%. Based on the statistical t test with 5% confidence limit, the potentiometric method and Atomic Absorption Spectrophotometry method had no significant differences. This shows that the Lead (II) ISE based pyrophyllite coated wire type can be used to the determination of lead in cosmetic samples. Key words: coefficient of Selectivity, ISE lead (II), pH, pyrophyllite
STUDI PENGARUH KONSENTRASI NaOH DAN pH TERHADAP SINTESIS SILIKA XEROGEL BERBAHAN DASAR PASIR KUARSA Ayu, Annisa Mustikaning; Wardhani, Sri; Darjito, Darjito
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

In this research, the influence of NaOH concentration and gelation pH of the xerogel silica synthesized from quartz sand. It was extracted by NaOH 1, 2, and 3 M to obtain sodium silicate solution and was added by HCl 1M to reach pH value 7, 8, and 9 to become gel. After that it was heated at 80° C for 18 hours (aging process) to get xerogel silica. This result xerogel silica were characterized by FT-IR and XRD and its surface area was characterized by methylene blue. The optimum concentration of NaOH is 1 M with silica yield 33%. Surface area which was obtained by concentration variation of NaOH is 7 to 8 m2 / g. Surface area was not influenced by pH variation and NaOH. Characteristics using FT-IR show typical absorption of Si - O at 400 to 3000cm-1 and phase of silica xerogel by XRD is amorphous. Determination of surface area xerogel silica by methylene blue methode 7.364 m2 / g.   Key words: Xerogel, NaOH Variation, pH variation.

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