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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
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Kota padang,
Sumatera barat
INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 551 Documents
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DEGRADASI POLIBLEND POLI(ASAMLAKTAT-KO-ASAMGLIKOLAT) DENGAN POLI(ε-KAPROLAKTON) SECARA IN VITRO Kemala, Tetty; Sjahriza, Achmad; Adijuwana, Hendra; Hardianti, Mardiana
Jurnal Riset Kimia Vol 2, No 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.158

Abstract

 ABSTRACT  Polymer has many applications in human life, one of them is in the field of health. Polymer synthetics like polylactic acid (PLA), polyglycolic acid (PGA), poly(ε-caprolactone) (PCL), and poly(lactic acid-co-glycolic acid) (PLGA) were kind of polyesters that is many used in field   of health. Many researchers have already made research about degradation of PLA, PGA, PCL, and PLGA. However, there is no one doing research about degradation of combination between this two polymers, one of them is polyblend of  PLGA and PCL. Polyblend were made of four compositions, that were PLGA(90:10):PCL 3:1, PLGA(75:25):PCL 3:1, PLGA(90:10):PCL 5:1, and PLGA(75:25):PCL 5:1. Degradation was carried out for eight weeks by using phosphate buffer pH 7.4 and incubation temperature of 37°C. Degradation of the polymer was observed by mass remained, and intrinsic viscosity. The result showed that composition PLGA(75:25):PCL 5:1 was the fastest in degradation compared to other compositions. It was showed by the decrease in mass until 89.06% and the change in intrinsic viscosity until 20.13%. Keywords: PLGA, PCL   
PEMBUATAN DAN KARAKTERISASI KATALIS ZnO/KARBON AKTIF DENGAN METODE SOLID STATE DAN UJI AKTIFITAS KATALITIKNYA PADA DEGRADASI RHODAMIN B Septiani, Upita; Bella, Ilona; -, Syukri
Jurnal Riset Kimia Vol 7, No 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.186

Abstract

 ABSTRACTComposite catalyst ZnO/Activated Carbon (ZnO/AC) had been synthesized successfully bysolid state method. Synthesis was done by varying the addition of activated carbon (AC) 2%,5%, and 10% ZnO mass. Composite catalyst were calcinated at 400oC and characterized byFTIR (Fourier Transform Infra Red), XRD (X-Ray Diffraction), SEM (Scanning ElectronMicroscopy). Based on the results of FTIR, absorption appeared in the region wave number1400-1600 cm-1, which indicated stretching of C=C was assumed come from AC. From theXRD results, it was known by the addition of AC, not overly change the crystallinity and crystalsize of ZnO, the crystal structure is hexagonal (wurtzite). SEM images showed AC preventedthe agglomeration of ZnO that would expand the surface area of ZnO and increased catalyticactivity of ZnO. For the results of the catalytic activity test, catalyst ZnO/AC was tested on thedegradation of Rhodamine B solution (10 ppm) by UV light irradiation, where the increasingnumber of trains the catalytic ability of ZnO also increased, it could be concluded that activatedcarbon can support to increase the role of ZnO in degrading Rhodamine B.Keywords: composite catalyst, ZnO, activated carbon, solid state, Rhodamine B
KRISTAL CAIR LAMELAR DALAM SISTEM AIR, TETRA ETILEN GLIKOL DODESIL ETER, DAN TEMBAGA NITRAT Amran, Ali
Jurnal Riset Kimia Vol 3, No 2 (2010): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i2.32

Abstract

JRK Vol. 3, No. 2ABSTRACT The lamellar liquid crystal in water, tetraethyleneglycol dodecylether, and copper nitrate system has been investigated. The results which characterized using optical polarizing microscope and small-angle x-ray diffraction showed the stability of the liquid crystal region was 40% and 65% by weight of surfactant. The interlayer spacing of lamellar liquid crystal, with and without various concentrations of copper nitrate content, remained constant. Keywords : Lamellar liquid crystal, Tetraethylene glycol dodecylether, Copper nitrate, Optical polarizing microscope, Small-angle x ray diffraction
FORMULASI MIKROPARTIKEL BERPORI DALAM POLI (D,L-Laktida) SEBAGAI SCAFFOLDDENGAN TEKNIK EMULSIFIKASI PENGUAPAN PELARUT Fitriani, Lili; Suciati, Tri
Jurnal Riset Kimia Vol 4, No 2 (2011): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i2.120

Abstract

 ABSTRACT Poly (D,L-lactide acid) has been used as scaffold for tissue engineering. In this study, PDLLA microparticles were made into porous microparticles. Porous microparticles were proposed to reduce burst release of protein and to prevent diffusion of released protein into non-target tissue. Formulation of porous microparticles was made by water-oil-water (W1/O/W2) emulsification-solvent evaporation using gas foamed as porogen. Variations of the amount of sodium bicarbonate, volume of citric acid solution and time for homogenization were optimized to produce optimum formulation. Evaluation for this microparticles included morphology of particles, particle size distribution and porosity. Porous microparticle produced by ratio volume of acid : dichloromethane : poly(vynil alcohol) (PVA) = 1:3:3 and the ratio of  sodium bicarbonate : PDLLA = 2:3 was the optimum formulation.  Keywords :Porous Microparticles, PDLLA,Gas Foamed, Scaffold, Solvent Evaporation 
MEMPELAJARI STRUKTUR DAN SIFAT NANO LOGAM TEMBAGA MENGGUNAKAN PROGRAM PM3 Sukma, Mulyati; Kusuma, Theresia Sita; Arief, Syukri
Jurnal Riset Kimia Vol 1, No 2 (2008): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i2.59

Abstract

  ABSTRACT A research to study the electronic and chemical characteristics of Copper which nano structure using PM3 program has been done. This program part of HyperChem pro 6.0 that performed by Pentium 4. This research has nano 2D and 3D structure (atom number 2-30). Results of computations showed that Copper can make nanosheets, nanorods and nanotubes structure that have the different electronic characteristics from its crystals structure. Fortunately, copper with nano structure could develop as insulator and semiconductor materials. Keywords : Copper, nano structure, nanosheets, nanorods, nanotubes.
MINYAK ATSIRI DARI Toona sinensis DAN UJI AKTIVITAS INSEKTISIDA Santoni, Adlis; Nurdin, Hazli; Manjang, Yunazar; Achmad, Sjamsul A.
Jurnal Riset Kimia Vol 2, No 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.142

Abstract

ABSTRACT Volatile components from leafs of Toona sinensis (Meliaceae) were isolated by distillation water-vapour method and analyzed using GC/MS. Forty-eight component were identified, and eight major components are Germacrene-D, Germacrene-B, α-Terpinene, α-Humulene, β-Caryophyllene,  α-Elemene, Bicyclogermacrene and α-copaene. Insect activity of the essential oil against Crosidolomia pavonana were tested. The activity of the essential oil with concentration 25% (mortality 73.3%), concentration 50% (mortality 83.3%) and concentration 75% (mortality 90%). Keywords : Toona sinensis (Meliaceae), essential oil, Crosidolomia pavonana, and mortality.    
ISOLASI KUMARIN DARI BIJI PINANG (Areca catechu L.) Ibrahim, Sanusi; Iqbal, Muhamad; Arifin, Bustanul
Jurnal Riset Kimia Vol 1, No 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.71

Abstract

 ABSTRACT Coumarin has been isolated from seed of Areca catechu L. an ethyl acetate fraction which needle crystal products at 184 –185°C. Based on thin layer chromatography analysis using n-hexane  : acetone (4 : 6) as eluent got Rf 0.6. From elemental analysis, mass spectra, ultraviolet spectra, infra red spectra, nuclear magnetic resonance spectra ( H and C NMR) ,concluded this compound was 7-hidroksi-4-metil coumarine.                                                       Keywords : Areca catechu, 7-hidroksi-4-metil kumarin.
KINETIC MODELING STUDY FOR ACYLATION REACTION OF O-XYLENE TO 3,4-DIMETHYLBENZOPHENONE OVER H-BETA -, Yusnimar
Jurnal Riset Kimia Vol 1, No 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.100

Abstract

 ABSTRACTThe reaction of o-xylene with benzoic anhydride has been studied by the changing molar ratio of the reactants (20:1, 10:1, and 5:1) in a batch reactor under reaction temperature 120oC. The reaction carried out without catalyst and also with catalyst Zeolite beta which was activated at 300oC overnight. HPLC analysis results showed that the yield of the product increase with the changing molar ratio of the reactants. An attempt was made in determining the kinetics of the reaction. The results show that the reaction is neither first nor second order in the acylating agent. Obtaining the reaction order even initially is unsuitable for even simple reactions that do not go to completion. It is even less applicable where more than a single process which affects the rate is taking place right from the start. These might be any one or combination of diffusion, adsorption, desorption, inhibition of the reaction by the product and multi step reactions on the surface. Postulated reaction mechanisms may be required in combination with experimental data to determine even initial reaction orders. Key words: o-xylene, catalyst, kinetics, reaction order.
TRANSPOR ION TEMBAGA (II) MELALUI TEKNIK MEMBRAN CAIR FASA RUAH Tetra, Olly Norita; Alif, Admin; A, Hermansyah; -, Emriadi
Jurnal Riset Kimia Vol 1, No 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.57

Abstract

 ABSTRACT Bulk liquid membrane methode have been used to study transport  of  Cu(II) ion containing oxine as carrier. It was found that total Cu(II) ion 20 ppm was transported from source phase to receiving phase after 360 min reached 97.3 % in optimum conditions source phase pH is 3, oxine concentration as carier in membrane phase is 17.5 x 10-4 M, membrane volume is 20 mL, sulfur acid concentration in receiving phase 0.15 M and time of balance is 15 minute. Thus a pH gradient is utilized to drive the Cu(II) transport.
PRODUKSI BIOETANOL DARI SAMPAH DEDAUNAN SEKITAR KAMPUS UNAND DENGAN METODE SSF (SIMULTANEOUS SACHARIFICATION FERMENTATION) Salim, Marniati; Mardiah, Elida; Atmelwidia, Yollanda
Jurnal Riset Kimia Vol 7, No 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.173

Abstract

Vol 7 No 2ABSTRACTIn this research, cellulose from waste leaves are conversed into ethanol by SSF technologyusing cellulase from Trichoderma viride strain T1 sk. In saccharification process, cellulasebreaks cellulase polymer into glucose. Simultaneously, the formed glucose is conversed intoethanol by invertase produced by Saccharomyces cerevisiaewhich is grew on YPD medium.Waste leaves are pretreatmented using basic solutions : basic NaOH 1 %, NH4OH 8 %, NaOH 1% + NH4OH 4 % and NaOH 1 % + NH4OH 8 % with ratio of solid mather (sample) : liquid(basic solution) 1:10 (w/v) with volume of basic solution 100 mL. Immersion time is variatedfor 24, 48 and 72 hours on 500C. The result of research shows that the use of NaOH 1% +NH4OH 4% gives the highest glucose concentration 933,75 μg/mL with immersion time for 72hours on 500C. After being pretreatmented, sample of 0,4 g waste leaves produce the highestglucose concentration. Measurement by GC/MS shows ethanol concentration 62,41% onfermentation time 96 hours with volume of ethanol 2,45 mL for 0,4 g sample.Keywords : Waste leaves, Pretreatment, Trichoderma viride strain T1 sk, SSF, Bioethanol

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