Article Per Year (5 Year)
p-Index From 2018 - 2023
0.408
P-Index
This Author published in this journals
All Journal CHEMISTRY PROGRESS Jurnal Natur Indonesia The Indonesian Journal of Dental Research Indonesian Journal of Chemical Science
Karna Wijaya
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Gajah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry

Published : 7 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 7 Documents
Search

 1 
HUBUNGAN KUANTITATIF STRUKTUR ELEKTRONIK DAN AKTIVITAS ANTITUMOR SENYAWA TURUNAN AMINO PIRIMIDO ISOKUINOLIN KUINON DENGAN PENDEKATAN REGRESI KOMPONEN UTAMA Saputra, Andrian; Wijaya, Karna; Tahir, Iqmal
CHEMISTRY PROGRESS Vol 6, No 1 (2013)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.6.1.2013.2066

Abstract

Tujuan penelitian ini yaitu menganalisis Hubungan Kuantitatif Struktur Aktivitas (HKSA) turunan amino pirimidoisokuinolin kuinon yang berkhasiat sebagai antitumor telah dilakukan dengan menggunakan pendekatan regresikomponen utama. Data aktivitas biologis yang digunakan pada penelitian ini merupakan aktivitas senyawamelawan sel tumor AGS (Human Gastric Adenocarcinoma Cell Line) dalam ukuran log IC 50 . Sebagai deskriptordigunakan muatan atom bersih bersih (q) pada kerangka struktur senyawa dari hasil optimasi geometrimenggunakan perhitungan mekanika kuantum semiempirik AM1. Analisis komponen utama dilakukan sebelum proses regresi untuk mendapatkan variabel laten yang merupakan hasil transformasi data deskriptor muatanatom bersih (q). Dengan pendekatan regresi komponen utama diperoleh keterkaitan erat antara log IC 50 dan q yang direpresentasikan dengan persamaan HKSA berikut :log IC 50 = 0,671 - 0,041.x 1 + 0,232.x 2 + 0,270.x 3 - 0,087.x 4 + 0,105.x 5dengan, n = 27, r = 0,762, SE = 0,362, F hitung /F tabel = 2,168.Quantitative Structure Activity Relationship (QSAR) analysis of amino-pyrimido-isoquinolin-quinone analoguesas antitumor compound has been done using principal component regression approaches. Biological activitydata that used in this research were the activity against tumor cell AGS (Human Gastric Adenocarcinoma CellLine) as log IC 50 values. Atomic net charges (q) in the skeleton of the compound have been selected asdescriptors and all data were resulted by geometry optimization using AM1 semiempirical quantum mechanicscalculations. Principle component analysis has been performed before regression process to produce latentvariables by transformation of the descriptors. Based on principle component regression approaches, there isa selected quantitative relationship between log IC 50 to the descriptors that was shown by QSAR equation below:log IC 50 = 0.671 – 0.041.x 1 + 0.232.x 2 + 0.270.x 3 – 0.087.x 4 + 0.105.x 5with, n = 27, r = 0.762, SE = 0.362, F calc. /F table = 2.168.
Karakterisasi dan Aplikasi Katalis Nikel-Molibdenum Teremban pada Zeolit Alam Aktif untuk Hidrorengkah Tir Batubara Sugianto, Dwi Julian; Wijaya, Karna; Tahir, Iqmal
Jurnal Natur Indonesia Vol 16, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (743.026 KB) | DOI: 10.31258/jnat.16.1.10-22

Abstract

Preparation and characterization of nickel-molybdenum catalysts supported on activated natural zeolite over hydrorackingof coal tar have been done. Modification of catalyst was included activation of zeolite by HCl 6N, wet impregnation of Ni-Mo metal and leaching the Ni-Mo from zeolite surfaces with EDTA solution.The parameters of catalyst have been determinedi.e acid site number, the ratio of Si/Al, crystallinity, content of Ni-Mo metal, specific surface area, total pore volume, and poreaverage diameter. The hydrocracking of coal tar was carried out at the optimum temperature (450°C) by flowing H2 gas (flowrate of 20 mL/min) on the coal tar with ratio of feed:catalyst was 10:1. The resulting liquid product was analyzed by GC/GCMS.The result showed that catalytic hydrocracking with ZAA catalyst had the highest conversion of liquid products,which were 40.51% (w/w) compared to Ni-Mo/ZAA catalyst gave 28.61% and Ni-Mo/ZAA(E) gaves 28.06% (w/w). Thehighest light fractions (67.63% (w/w)) produced by using Ni-Mo/ZAA catalyst and the highest medium fractions wereproduced over ZAA catalyst which was 36.61% (w/w) and the highest total conversion on the product with Ni-Mo/ZAA(E)catalyst produced was 50.05% (w/w). The product analyzed with GC-MS result on the 9th highest peak showed that thehydrocracking products resulted over Ni-Mo/ZAA mostly were phenol and its derivatives.
Effect of Copper (II) Chloride Concentration towards Copper Ions Sorption on Natural Zeolite from Wonosari Irnawati, Dyah; Widjijono, Widjijono; Wijaya, Karna; Asmara, Widya
The Indonesian Journal of Dental Research Proceeding Book
Publisher : The Indonesian Journal of Dental Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (19.124 KB)

Abstract

Copper-containing zeolite has been developed as an antibacterial material. It is obtained by reacting zeolite and salt solution with varied concentration of copper. Natural zeolite is abundant in Wonosari, Yogyakarta. The aim of this research was to investigate the concentration effect of copper (II) chloride solutions towards copper ions sorption on natural zeolite from Wonosari. Copper (II) chloride dihydrate powders, CuCl2. 2H2O, (Merck, Germany) and natural zeolite (Wonosari, Indonesia) were used. Zeolite powder (100 mesh) was washed and dried (200oC/2 hours). Copper (II) chloride solution with different concentrations (0.05 M, 0.10 M, 0.15 M, 0.20 M, and 0.25 M) were prepared. Zeolite and CuCl2 solutions (50 g/250 ml) were reacted at 60oC for 1 hour (n=5). The solutions were filtered, washed, and dried (100oC/24 hours). Copper ions amount were measured by XRF (Canberra Inc., USA). The data were analyzed by one way Anova. Mean values (% weight) of copper ions amount were 0.441 ± 0.029 % (0.05 M group), 0.588 ± 0.027 % (0.10 M group), 0.657 ± 0.014 % (0.15 M group), 0.676 ± 0.037 % (0.20 M group), and 0.737 ± 0.039 % (0.25 M group). The Anova showed that CuCl2 concentration influenced copper ions amount significantly (p<0.01). The differences among the groups were significant, except between 0.15 M and 0.20 M groups (p>0.05). Copper (II) chloride concentration influenced the copper ions sorption on natural zeolite from Wonosari. The 0.25M CuCl2 solution gave the highest copper ions amount.
Konversi Gliserol menjadi Polihidroksibutirat dengan Menggunakan Bakteri Eschericia coli Rahayu, Endah Fitriani; Trisunaryanti, Wega; Wijaya, Karna
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Conversion of glycerol into polyhydroxybutyrate (PHB) using Eschericia coli bacteria had beed evaluated. The bacteria was cultured in lactose medium, consist of 1% of lactose, peptone, and NaCl, then incubated at 37oC for 24 h. The bacteria culture was then added into the 10 g/L, 20 g/L, 30 g/L, 40 g/L, and 50 g/L glycerol media and then fermented for 24, 48, 72, and 6 h, then followed by centrifugated and solid phase was dried and weighed as a biomass. The filtrate was analyzed to determine the remaining glycerol. PHB was extracted from the biomass using chloroform, and then analyzed by FT-IR, H-NMR, C-NMR and viscometer. Monomer unit of the polymer was produced by esterification of the polymer then analyzed by GC.                Analysis generates that FT-IR, H-NMR, C-NMR, and GC shows the PHB can be synthesize from glycerol using Eschericia coli. PHB production is increasing if the time fermentation and initial glycerol concentration has been risen, with the maximum PHB produced is 92,73%. Molecular weight of PHB has maximum value if produced at initial glycerol concentration 40 g/L for 96 h. in the initial glycerol concentration 50 g/L, the molecular weight of PHB was reduced.
Studi Teoritis Senyawa Turunan Kalkon Hidroksi sebagai Chemosensor Anion Perdana, Fitra; Wijaya, Karna; Armunanto, Ria
Indonesian Journal of Chemical Science Vol 8 No 1 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Studi secara teoritis telah dilakukan untuk mempelajari interaksi senyawa turunan kalkon hidroksi (CH) sebagai sensor kimia dengan anion F-, Cl-, Br-, CN-, CH3COO-, dan NO3-. Penelitian ini bertujuan untuk memodelkan struktur molekul senyawa turunan kalkon hidroksi (CH) dan sifat sensornya serta model interaksinya dengan anion dengan metode DFT. Hasil optimasi geometri menunjukkan terjadinya pemanjangan ikatan O-H sebesar 0,63-0,85 Å dengan adanya anion F-, CN-, and CH3COO-. Hal ini mengindikasikan terjadinya deprotonasi sensor kalkon hidroksi (CH) oleh anion. Sedangkan interaksi sensor kalkon hidroksi (CH) dengan anion Cl-, Br-, dan NO3- hanya berupa ikatan hidrogen dengan pemanjangan ikatan O-H sebesar 0,08-0,46 Å. Sensor kalkon hidroksi (CH) yang mengalami deprotonasi memiliki energi interaksi yang lebih besar yaitu -209,37 – -424,06 kJ/mol dibandingkan sensor yang hanya membentuk ikatan hidrogen yaitu -98,60 – -125,59 kJ/mol. Sensor yang mengalami deprotonasi mengakibatkan turunnya selisih energi HOMO-LUMO dari -3,94 – -4,06 eV menjadi -2,62 – -2,75 eV.
Konversi Gliserol menjadi Polihidroksibutirat dengan Menggunakan Bakteri Eschericia coli Rahayu, Endah Fitriani; Trisunaryanti, Wega; Wijaya, Karna
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v6i3.19668

Abstract

Conversion of glycerol into polyhydroxybutyrate (PHB) using Eschericia coli bacteria had beed evaluated. The bacteria was cultured in lactose medium, consist of 1% of lactose, peptone, and NaCl, then incubated at 37oC for 24 h. The bacteria culture was then added into the 10 g/L, 20 g/L, 30 g/L, 40 g/L, and 50 g/L glycerol media and then fermented for 24, 48, 72, and 6 h, then followed by centrifugated and solid phase was dried and weighed as a biomass. The filtrate was analyzed to determine the remaining glycerol. PHB was extracted from the biomass using chloroform, and then analyzed by FT-IR, H-NMR, C-NMR and viscometer. Monomer unit of the polymer was produced by esterification of the polymer then analyzed by GC. Analysis generates that FT-IR, H-NMR, C-NMR, and GC shows the PHB can be synthesize from glycerol using Eschericia coli. PHB production is increasing if the time fermentation and initial glycerol concentration has been risen, with the maximum PHB produced is 92,73%. Molecular weight of PHB has maximum value if produced at initial glycerol concentration 40 g/L for 96 h. in the initial glycerol concentration 50 g/L, the molecular weight of PHB was reduced.
Studi Teoritis Senyawa Turunan Kalkon Hidroksi sebagai Chemosensor Anion Perdana, Fitra; Wijaya, Karna; Armunanto, Ria
Indonesian Journal of Chemical Science Vol 8 No 1 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v8i1.28504

Abstract

Studi secara teoritis telah dilakukan untuk mempelajari interaksi senyawa turunan kalkon hidroksi (CH) sebagai sensor kimia dengan anion F-, Cl-, Br-, CN-, CH3COO-, dan NO3-. Penelitian ini bertujuan untuk memodelkan struktur molekul senyawa turunan kalkon hidroksi (CH) dan sifat sensornya serta model interaksinya dengan anion dengan metode DFT. Hasil optimasi geometri menunjukkan terjadinya pemanjangan ikatan O-H sebesar 0,63-0,85 Å dengan adanya anion F-, CN-, and CH3COO-. Hal ini mengindikasikan terjadinya deprotonasi sensor kalkon hidroksi (CH) oleh anion. Sedangkan interaksi sensor kalkon hidroksi (CH) dengan anion Cl-, Br-, dan NO3- hanya berupa ikatan hidrogen dengan pemanjangan ikatan O-H sebesar 0,08-0,46 Å. Sensor kalkon hidroksi (CH) yang mengalami deprotonasi memiliki energi interaksi yang lebih besar yaitu -209,37 – -424,06 kJ/mol dibandingkan sensor yang hanya membentuk ikatan hidrogen yaitu -98,60 – -125,59 kJ/mol. Sensor yang mengalami deprotonasi mengakibatkan turunnya selisih energi HOMO-LUMO dari -3,94 – -4,06 eV menjadi -2,62 – -2,75 eV.
Co-Authors Andrian Saputra Dwi Julian Sugianto, Dwi Julian Dyah Irnawati I Wayan Sutapa Iqmal Tahir Luh Putu Ratna Sundari Mohd Noor Ahmad Rahayu, Endah Fitriani Ria Amunanto Ria Armunanto Wega Trisunaryanti Widjijono , Widya Asmara