cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota malang,
Jawa timur
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
 5   6   7   8   9 
STUDI AKTIVASI ARANG DARI TEMPURUNG KELAPA DENGAN PENGOZONAN Anggarini, Dita; Tjahjanto, Rachmat Triandi; Darjito, Darjito
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.475 KB)

Abstract

ABSTRAK Penelitian tentang pembuatan arang aktif dari tempurung kelapa dengan pengozonan telah dilakukan. Arang hasil aktivasi dengan pengozonan kemudian dibandingkan kualitasnya dengan arang aktif hasil aktivasi ZnCl2. Arang dari tempurung kelapa dikarbonisasi pada temperatur 600 ºC selama dua jam. Arang diaktivasi menggunakan ZnCl2 selama satu jam pada temperatur 550 ºC dan pengozonan dengan variasi waktu 0, 20, 40 dan 60 menit. Arang hasil aktivasi dibandingkan daya adsorpsinya terhadap senyawa iodin, metilen biru dan metil jingga. Hasil penelitian menunjukkan bahwa arang aktif yang diaktivasi dengan ZnCl2 memiliki daya adsorpsi yang lebih baik terhadap senyawa iodin, metilen biru dan metil jingga daripada arang aktif yang diaktivasi dengan pengozonan. Namun, semakin panjang waktu pengozonan arang aktif yang dihasilkan memiliki daya adsorpsi terhadap metilen biru dan metil jingga yang semakin baik Kata kunci: adsorpsi, arang aktif, ozonisasi, tempurung kelapa. ABStract Research of activated carbon from coconut shell by ozonisation was conducted. The results compared with activated carbon by ZnCl2. Carbon was made from coconut shell by carbonated at 600 oC for 2 hours. Furthermore, carbon was activated by ZnCl2 for 1 hour at 550 ºC and activated by ozone with time varied from  0, 20, 40 and 60 minutes. The adsorption of activated carbon towards iodine, methylen blue and methyl orange was compared. The results showed that activation by ZnCl2 had a better adsorption process towards iodine, methylene blue and methyl orange than ozonated activated carbon. However, the longer ozonisation time produce activated carbon which had a better adsorption of methylene blue and methyl orange Key words: adsorption, activated carbon, coconut shell, ozonisation
STUDI PEMBERIAN EKSTRAK RUMPUT LAUT COKLAT (Sargassum prismaticum) TERHADAP KADAR MDA DAN HISTOLOGI JARINGAN PANKREAS PADA TIKUS Rattus norvegicus DIABETES MELITUS TIPE 1 HASIL INDUKSI MLD-STZ (MULTIPLE LOW DOSE - STREPTOZOTOCIN) Dewi, Devis Resita; Aulanni'am, Aulanni'am; Roosdiana, Anna
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (141.245 KB)

Abstract

The aim of this research was to investigate the effect of brown seaweed (Sargassum prismaticum) extract to decreased MDA levels and improvement of pancreatic tissue histology on rats Rattus norvegicus type 1 diabetes mellitus (DM). Type 1 diabetic rats induced by intraperitonial (i.p) injection of Multiple Low Dose-Streptozotocin (MLD-STZ) with 20 mg/kg (bw) dose for 5 consecutive days. MDA was measured by UV-Vis spectrophotometry method at a wavelength of 540 nm using TBA (Thiobarbituric acid) reagent. Histology of pancreatic tissue performed using Hematoxylen-Eosin staining method. In this research, rats were grouped into 6 treatment groups: the group of control rats, type 1 diabetic rats exposed to MLD-STZ, and type 1 diabetic rats exposed to MLD-STZ than treated by brown seaweed extract orally with 0.8 g/tail dose by 2 mL per day for 1, 3, 5, and 7 days. The results of this research obtained average MDA levels of each group of consecutive treatments were 2.507; 6.770; 5.543; 4.444; 3.734 and 2.980 mg/mL. Therapy with Sargassum prismaticum extract for 7 days can reduce MDA levels of type 1 diabetic rats by 55.98% indicating level of (6.770 ± 0.027) mg/dL to be (2.980 ± 0.017) mg/dL and able to improved pancreatic tissue histology type 1 diabetic rats. Key words: diabetes mellitus, histology, MDA, pancreas, Sargassum prismaticum
PENGARUH TEKNIK EKSTRAKSI DAN KONSENTRASI HCl DALAM EKSTRAKSI SILIKA DARI SEKAM PADI UNTUK SINTESIS SILIKA XEROGEL Pratomo, Ilham; Wardhani, Sri; Purwonugroho, Danar
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.412 KB)

Abstract

Penelitian tentang teknik ekstraksi silika dari sekam padi untuk sintesis silika xerogel telah dilakukan. Proses ekstraksi silika dari sekam padi menggunakan metode pencucian asam dilakukan dengan dua teknik, yakni dengan pengadukan pada temperatur kamar dan refluk pada temperatur 100 oC selama 2 jam dengan konsentrasi HCl 1, 2, dan 3 M. Penentuan kadar silika dilakukan dengan menggunakan metode gravimetri. Berdasarkan tabel ANOVA bahwa pengaruh konsentrasi dan teknik ekstraksi yang digunakan tidak berpengaruh  pada kadar silika yang dihasilkan. Kadar tertinggi silika diperoleh pada teknik pengadukan konsentrasi HCl 1 M dengan kadar 97,30% digunakan sebagai bahan baku pembuatan prekursor pada sintesis silika xerogel. Silika direaksikan dengan NaOH 1 M pada temperatur 95 oC selama 1 jam kemudian diasamkan dengan HCl 1 M sampai pH 7 dan didiamkan selama 12 jam. Gel yang diperoleh dibilas menggunakan akuades, lalu dikeringkan pada temperatur 80 oC selama 18 jam. Silika xerogel yang diperoleh memiliki kadar sebesar 98,23%. Karakterisasi silika dan silika xerogel dengan menggunakan FT-IR menunjukan adanya gugus silanol (3440 dan 3452 cm-1) dan siloksan  (1100 dan 1076 cm-1). Karakterisasi  luas permukaan menggunakan metilen biru berturut-turut abu sekam padi, silika hasil ekstraksi, silika xerogel diperoleh hasil 7,012; 7,5dan 7,99 m2/g. Kata kunci: kadar, silika, teknik ekstraksi, xerogel
OPTIMASI EKSTRAKSI SILIKA DAN ALUMINA DARI LUMPUR SIDOARJO Putra, Ahmad Naufal Hasti Eka; Tjahjanto, Rachmat Triandi; Khunur, Mohammad Misbah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (80.252 KB)

Abstract

Optimization of silica and alumina extraction from Sidoarjo mud have studied. The aim of this research is to know the optimum condition of silica and alumina extraction from Sidoarjo mud. Optimum condition of extraction is studied by variying the concentration and solvent used in the extraction process. Hydrochloric acid and NaOH were used in silica and alumina extraction from Sidoarjo mud. Hydrochloric acid was added to the filtrate of NaOH extract to obtain Al(OH)3 at pH 8, further the HCl added until pH 4 to obtain Si(OH)4. The filtrate of HCl extract wad added by NaOH until pH 4 to precipitate Fe(OH)3, further NaOH was added until pH 8 to obtain Al(OH)3. The result of this experiment shows that extractions result was affected by the concentration and the solvent used. The optimal concentration of solvent for extraction prosses is 6 M for both acid and base. The purest silica in this research was obtained from NaOH extract with the purity level of 95,6%.
Pengaruh Lama Waktu Penyimpanan dan Penyinaran Cahaya Terhadap Komponen Penyususn Minyak Atsiri dari Tanaman Sereh (Cymbopogon winterianus) serta Uji Aktivitas Menggunakan Metode BSLT (Brine Shrimp Lethality Test) Pratiwi, Rahmania Tulus Setya; Iftitah, Elvina Dhiaul; Ulfa, Siti Mariyah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (121.463 KB)

Abstract

This research concerned with the effect of storage time and light radiation toward the composition of essential oil from lemongrass. The activity of  lemongrass oil before and after storage was examined using BSLT. The storage condition were performed in clear vials and black vials and then placed in wooden box in three different conditions for 6 weeks. The first box was radiated with the lamp for 24 hours, the second box made from a transparent material at front and it back sides, and the third was a closed-black box. Analysis of the component of essential oil before storage using Gas Chromatography-Mass Spectrometry (GC-MS) and after storage using Gas Chromatography (GC). The results from GC-MS showed that the percentage of citronellal, which is the active compound of lemongrass oil,is 24.730% before storage and significantly increased to 29.195% after 2 weeks in clear vials (box 1). The activity test of this sample was conducted using BSLT. The LC50 values of lemongrass oil before storage is 9.19 ppm and changing to 19.76 ppm after storage. Keywords : Brine Shrimp Lethality Test, citronellal, essential oil, light radiation, storage
AMOBILISASI PEKTINASE DARI Bacillus firmus MENGGUNAKAN MATRIKS OPP (OXIDIZED POLYPROPYLENE)-KITOSAN Sari, Ayunda Arum; Roosdiana, Anna; Mardiana, Diah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (91.542 KB)

Abstract

A Pectinase is an enzyme that can hydrolyze pectin compounds into galacturonic acid. In order to enhance the pectinase efficiency, the enzyme can be immobilized in certain matrix. The pectinase was isolated from Bacillus firmus, and then purified with ammonium sulphate with 20-60% saturated level, followed by dialysis. The aims of the research were to determine the optimum conditions of immobilized pectinase by physical adsorption on oxidized polypropylene (OPP) coated chitosan, which included the shaking time and enzyme concentration. Initial protein used for immobilizing free pectinase was 1.367 mg/mL and the activity was 241.1 units. The results showed that the optimum condition of pectinase immobilization was achieved on shaking time of 3 hours and pectinase concentration of 1.094 mg/mL with amount of pectinase adsorbed at 53,98 mg/g within activity of 220.2 units.
STUDI PENGARUH WAKTU REAKSI TERHADAP SINTESIS SENYAWA ORGANONITROGEN BERBASIS α-PINENA MELALUI REAKSI RITTER Fatma, Aliya; Rahman, Mohammad Farid; Ulfa, Siti Mariyah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (105.671 KB)

Abstract

The aim of this research is to synthesize organonitrogen compound using α-pinene as starting material which reacted with acetonitrile and acid catalysts through Ritter reaction. The reactions were optimized by modifying a reaction time varied from 6, 10, and 15 hours. α-Pinene used in this reaction was isolated from turpentin oil by fractional distillation in 88.46%. There were three major products obtained from reaction of α-pinene, acetonitrile and H2SO4 97%, that is, N-(2,6,6-trimethylbicyclo[3.1.1]heptan-2-yl)acetamide as product 1, N-(2-(4-methylcyclohex-3-enyl)propan-2-yl) acetamide  as product 2, and N-(1,7,7-trimethylbicyclo[2.2.1] heptan-2-yl)acetamide as product 3. The percentage of product 2 and product 3 were increased by the increasing of reaction time, while product 1 was decreased. This result is considered by different stability of product structure. Product 2 and 3 should be the most stable structure than product 2. The other acetamide derivatives were also produced but in low percentage. Key words: α-pinena, Ritter reaction, acetamide compound, organonitrogen compound, reaction time
Studi Kinetika Reaksi Asilasi Fenol dengan Asam Sitrat Anhidrida Alim, Hidayat Akbar Adiansyah; Kamulyan, Budi; Suratmo, Suratmo
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (252.729 KB)

Abstract

Studi kinetika reaksi asilasi fenol dengan asam sitrat anhidrida bertujuan untuk mempelajari kinetika reaksi asilasi fenol dengan asam sitrat anhidrida serta mempelajari pengaruh konsentrasi fenol terhadap kinetika reaksinya dari kadar fenol sisa. Asam sitrat anhidrida dibuat dari asam sitrat dengan cara memanaskan pada suhu 1700C dalam reaktor. Reaksi asilasi fenol dengan asam sitrat anhidrida dilakukan pada suhu 700C dengan variasi perbandingan konsentrasi fenol  dan waktu reaksi. Perbandingan konsentrasi fenol dengan asam sitrat anhidrida dilakukan pada 3:1 ; 2:1 ; 1:1 dan pada variasi waktu reaksi 30, 60, 90, 120 menit. Kadar fenol sisa dari reaksi asilasi fenol dengan asam sitrat anhidrida diidentifikasi dengan menggunakan metode folin – ciocalteu. Identifikasi senyawa dengan menggunakan spektrofotometer FTIR digunakan untuk mengetahui gugus fungsi dari senyawa fenol, asam sitrat, asam sitrat anhidrida dan senyawa hasil reaksi. Dari hasil percobaan menunjukkan reaksi orde dua. Semakin besar konsentrasi fenol akan meningkatkan kadar fenol sisa dan menurunkan konstanta laju reaksi. Kata kunci: asam sitrat anhidrida, fenol, reaksi asilasi.
KINETIKA REAKSI HIDROLISIS PATI BIJI DURIAN (Durio zibethinus Murr.) MENJADI GLUKOSA DENGAN VARIASI TEMPERATUR DAN WAKTU Anugrahini, Sarah Fitria Agung; Ismuyanto, Bambang; Indahyanti, Ellya
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (103.71 KB)

Abstract

ABSTRAK Penelitian ini bertujuan untuk mengetahui pengaruh temperatur dan waktu pada proses hidrolisis pati biji durian (Durio zibethinus Murr.) menjadi glukosa serta untuk menentukan kinetika reaksi pada proses hidrolisis tersebut. Proses hidrolisis dilakukan dengan menggunakan katalis HCl 3M. Variasi temperatur yang digunakan yaitu 50 oC dan 70 oC dengan variasi waktu sebesar 30, 60, 90, 120, 150 dan 180 menit. Kadar glukosa larutan hidrolisat kemudian dianalisis menggunakan reagen DNS. Berdasarkan hasil penelitian, dapat diketahui bahwa temperatur dan waktu hidrolisis mempengaruhi kadar glukosa. Semakin tinggi temperatur dan semakin lama waktu hidrolisis maka kadar glukosa larutan hidrolisat semakin meningkat. Kadar glukosa larutan hidrolisat kemudian digunakan untuk menentukan kinetika reaksi hidrolisis. Kinetika reaksi hidrolisis pati biji durian (Durio zibethinus Murr.) menjadi glukosa dapat dinyatakan dengan persamaan: k = 3,593 x 106 . e-10153,812/T M.menit -1 Katakunci: biji durian, glukosa, hidrolisis, kinetika, pati   ABSTRACT   This experiment aim to find out the influence of temperature and time on hydrolysis of durian (Durio zibethinus Murr.) seed starch become glucose and to determine the reaction kinetics of hydrolysis process. Hydrolysis process was conducted by using HCl 3M as catalyst. The temperature varied from 50 oC and 70 oC, while time variation varied from 30, 60, 90, 120, 150 and 180 minutes. Glucose levels of hydrolysate solution was analyzed using DNS reagent. This experiment resulted that temperature and hydrolysis time affected the glucose levels. Increasing of temperature and hydrolysis time produced higher glucose levels of hydrolysate solution. The glucose levels of hydrolysate solution used to determine the reaction kinetics. Reaction kinetics of durian seed hydrolysis become glucose stated with equation: k = 3,593 x 106 . e-10153,812/T M.minutes -1 Keywords: durian seed, glucose, hydrolysis, kinetics, starch
PENGARUH pH DAN WAKTU AGING DALAM SINTESIS SILIKA XEROGEL BERBASIS SEKAM PADI Mardiana, Ira; Wardhani, Sri; Purwonugroho, Danar
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (135.664 KB)

Abstract

Telah dilakukan penelitian tentang sintesis silika xerogel dari sekam padi dengan metode sol gel menggunakan prekursor natrium silikat. Tujuan penelitian ini adalah untuk mempelajari pengaruh pH dan waktu aging serta mengetahui karakter silika xerogel. Natrium silikat disintesis dari SiO2 dengan NaOH pada temperatur 95 OC selama 1 jam. Natrium silikat diasamkan dengan HCl sampai pH 1. Selanjutnya pH dinaikkan menggunakan NaOH 1 M sampai pH 6, 7 dan 8 untuk menghasilkan sol. Sol didiamkan dengan waktu aging 12, 18 dan 24 jam. Silika gel yang dihasilkan dikeringkan pada temperatur 80 OC selama 18 jam untuk menghasilkan xerogel. Karakterisasi silika xerogel yang dilakukan adalah menentukan luas permukaan dan kemurniannya. Luas permukaan silika xerogel ditentukan dengan metilen biru dan kemurniannya secara gravimetri. Identifikasi gugus fungsi dan struktur kristal menggunakan FTIR dan XRD. Hasil penelitian menunjukan bahwa sintesis silika xerogel terjadi pada pH optimum 6 dengan waktu aging optimum 12 jam. Hasil karakterisasi silika xerogel pada keadaan optimum menunjukkan luas permukaan sebesar 4,24 m2/g dengan kemurnian 98,06%.  Spektra IR silika xerogel hasil sintesis mengandung gugus silanol (Si-OH) dan siloksan (Si-O-Si) serta data XRD memperlihatkan silika xerogel berstruktur amorf. Kata kunci: silika, sol-gel, xerogel

Page 7 of 22 | Total Record : 214

 5   6   7   8   9 

Filter by Year

2013 2015


Reset
Filter By Issues
All Issue Vol 1, No 1 (2015) Vol 2, No 2 (2014) Vol 2, No 1 (2014) Vol 1, No 2 (2014) Vol 1, No 1 (2014) Vol 2, No 2 (2013) Vol 2, No 1 (2013) Vol 1, No 2 (2013) Vol 1, No 1 (2013)