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INDONESIA
EKSAKTA: Journal of Sciences and Data Analysis
Published by Universitas Islam Indonesia
ISSN : 27160459     EISSN : 27209326     DOI : 10.20885
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Materials Science & Nanotechnology
Ekstakta is an interdisciplinary journal with the scope of mathematics and natural sciences that is published by Fakultas MIPA Universitas Islam Indonesia. All submitted papers should describe original, innovatory research, and modelling research indicating their basic idea for potential applications. The Journal particularly welcomes submissions that focus on the progress in the field of mathematics, statistics, chemistry, physics, biology and pharmaceutical sciences.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 9 Documents
 1 
Search results for , issue "VOLUME 12, ISSUE 1, February 2011" : 9 Documents clear
Adsorption Competition between H+ and Cd2+ Ions Toward Active Sites on Ionic Imprinted Mercapto-Silica Hybrid Buhani Buhani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Adsorption process on Cd2+ionic  imprinted mercapto-silica hybrid material  (Cd(II)-IIP HMS) has been carried out with studying an adsorption competition between ion H+ and Cd2+ ion upon active sites of Cd(II)-IIP HMS material.  Characterization of surface material was based on specific surface area, total volume, and porous diameter.  Cd(II)-IIP HMS material with template ionic concentration of each 0.107; 0.214; 0.429; 0.658 mmol g-1 shows  that adsorption model  is relatively similar, the higher of H+ ion competed,  the  lower of adsorption capacity of Cd(II)-IIP HMS material upon Cd2+ ion.  Keywords: adsorption, active site, mercapto-silica hybrid, ionic imprinted
Screening of Secondary Metabolites Compounds in Stem Bark of Frangipangi (Plumeria alba) and Toxicity Test on Shrimp Larvae (Brine Shrimp Lethality Test) Santi Nur Handayani; Moch. Chasani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Frangipani  is  a  plant  belonging  to  the  family  Apocynacea  and  potential  for development as anti-cancer drug material. Content of secondary metabolites, anti-cancer compounds from frangipani (Plumeria alba) steam bark, especially it has not been made. This  research aims  to  identify compounds  secondary metabolites  from  frangipani  steam bark extract potential for development as anti-cancer drug material. Steps undertaken in this study include:  Extraction of secondary metabolites with frangipani  stem  bark  maceration  method  of  storey  with  n-hexane,  chloroform,  ethyl acetate, and ethanol. Each tested extracts obtained using prawn shrimp toxicity A. salina Leach  and  continued  with  the  testing  of  secondary  metabolites  using  color  reagents. fraction  extract  has  potential  as  an  anti-cancer  drugs  is  purified  using  gravity  column chromatography  technique  with  elusi  gradient  technique  using  a  solvent  mixture  n-hexane:ethyl acetate hen conducted toxicity tests followed by identification using GC-MS  Extraction  results obtained by  the  four extracts namely: n-hexane extract  (E1)  is positive flavonoid groups, chloroform extract (E2), ethyl acetate extract (E3) and ethanol extract (E4)  is positive for secondary metabolite groups flavonoid and alkaloid. Toxicity test results obtained LC50 values respectively participated: 973. 7 ppm (E1), 451.35 ppm (E2), 112.557 ppm(E3), and 637.50 ppm(E4).   Keywords: Plumeria alba, secondary metabolite, toxicity test, and A. salina Leach 
Effect Of Curcumin And Honey To Pharmacokinetics Of Paracetamol In Male Wistar Rats Dimas Adhi Pradana; Farida Hayati; Agung Giri Samudra; Amalinda Setya Kartika
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Honey and curcumin is widely consumed by children as food supplements. Honey is useful as an antioxidant and antibacterial, while curcumin  is useful as an antioxidant, antiinflammatory,  antibacterial,  antiviral. Both  health  supplements  are  not  infrequently used in conjunction with drugs, especially paracetamol. This study aims to determine the effect of curcumin and honey on the pharmacokinetic parameters of paracetamol in male rats.  In  this  study,  test  animals  were  divided  into  3  groups:  control,  treatment  I  and treatment  II.  In  the  control  group  mice  were  given  paracetamol  150mg  /  KgBW, treatment  group  I  rats  were  given  curcumin  18  mg  /  KgBW,  1  hour  and  then  given paracetamol 150mg  / KgBW whereas  the  treatment group  II  rats given a dose of honey 7.65 mL / KgBW along with giving paracetamol 150mg KgBB . The results showed that administration of curcumin on the pharmacokinetics of paracetamol in mice can decrease the  primary  parameters  of  the  elimination  phase  of  CLT  for  68.25%,  increasing  the secondary parameter t 1 / 2 at 193.72%, thus increasing the derivative parameters AUC0-inf for 88.36%, and MRT of 155.17% (p
Prediction Using Distributed Lagged Subset Model Suparman Suparman
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

This  article  examines  the  problem  of  determining  the  future  value  of  the  dependent variable in the distributed lagged subset model. Unlike a distributed lag model in general, which assumes that all coefficients are not zero. In a distributed lagged subset model, some coefficients may be zero. The purpose of  this  study was  to determine  the predictive value of  the dependent variable in a distributed lagged subset model. The approach used to estimate the parameters of a distributed lagged subset model is the least square method and Ck statistic. Least squares method is used to determine the estimators of the coefficient of a distributed lagged subset model. Ck Statistic is used to select the best distributed lagged subset model. Some  simulations are delivered and prove  the efficiency of  this approach. Furthermore, this approach is implemented in real economic data.  Keywords : Distributed lagged subset model, Prediction, Least square method, Ck Statistic.  
Evaluasi Unjuk Kerja Alat Spektrofotometer UV-Vis Menggunakan Holmium Oksida dan Kalium Dikromat Thorikul Huda; Cecep Sa'bana Rahmatillah; Yusuf Habibi
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

The Evaluation of Hitachi U 2010 UV-Vis Spectrophometer performance using holmium glass  from  Starna  reference materials  and  potassium  dichromate  has  been  done.    The  aim  of investigation with holmium glass was to known wavelength work region at ultra violet and visible area,  potassium  dichromate  solution  used  to  known  photometric  performance  of  UV-Vis spectrophotometer.   The  result of  investigation used holmium glass showed wavelength peak at 241,  278,  287,  333,  360,  418,  445,  453, 459,  536  and  637  nm  regions, wich  it  is  similar with reference material.  The determination of photometric resulted by absorbance value measurement at  235,  275,  313  and  350  nm  were  0,746;  0,860;  0,294;  0,641  respectively.      The  result  of wavelength  and  photometric  investigation  showed  that Hitachi U  2010  spectrophotometer was proper to done and suitable with SR 03 KAN reference.  Keywords:  UV-Vis  Spectrophometer,  holmium  glass,  potassium  dichromate,  wavelength,
Parameter Estimation in Probit Model for Multivariate Multinomial Response Using SMLE Jaka Nugraha
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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In  the  research  field  of  transportation,  market  research and  politics,  often involving  the  response  of  the multinomial multivariate  observations.  In  this  paper, we discused  a  modeling  of  multivariate  multinomial  responses  using  probit  model.  The estimated  parameters  were  calculated  using Maximum  Likelihood  Estimations  (MLE) based  on  the  GHK  simulation.  method  known  as Simulated  Maximum  Likelihood Estimations (SMLE). Likelihood function on the Probit model contains probability values that must be resolved by simulation. By using  the GHK simulation algorithm,  the estimator equation has been obtained for the parameters in the model Probit  Keywords : Probit Model, Newton-Raphson Iteration,  GHK simulator, MLE, simulated log-likelihood
Synthesis of 4 Phenyl 3,4 Dihydr Indeno[2′,1′]Pyrimidine 2 One on Different Amount of Catalysts Ritmaleni Ritmaleni; Megawati Parmasari
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Dihydropirimidine  is  a  heterocyclic  compound  which  has  important  pharmacologic  and  therapeutic  activities.  This  compound  can  be  synthesised  by  using Biginelli  reaction  which  involve  three  type  of  starting  materials  and  also  have  been developed  into  different method    of  reaction  condition  and  starting material.  LR1  (4phenyl3,4dihydroindeno[2′,1′]pyrimidine2one)  is  a  derivative  of  dihydropirimidine. This research was aimed to study the effect of catalyst amount in the synthesis of LR1 in order to reach the optimal yield.  LR1 can be synthesised form benzaldehyde, urea adn 2indanone in ethanol and concentrated chloric acid as catalyst for five hours under reflux. The product mixture was then  extracted  and  isolated  by  column  chromatography  preparative.  The melting  point was checked to determine the purity of the product. The structure elucidation was carried out by using spectroscopic method (uvvis, IR, 1HNMR and MS) The result showed that the highest yield of LR1 was obtained around 15 % when 0.25 %  of chloric acid used as catalyst. The higher the condition of acid in the reaction, the lower the tield of LR1 obtained.
Studi Adsorpsi Larutan Gliserol Menggunakan Karbon Aktif: Efek Konsentrasi, Tegangan Permukaan Dan Temperatur Yuniawan Hidayat; Atmanto Heru Wibowo; Dwi Ngandayani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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The effect of adsorbate concentration, surface tension and temperature on glycerol adsorption  over  activated  carbon  have  been  conducted.  Activity  of  adsorbent  was increased  by  soaking  activated  carbon  in  H2SO4  10%  solution  for  12  hours  followed heating  at  a  temperature  of  500oC  under  N2  gas  flow  for  3  hours.  Furthermore,  the identification  and  characterization  of  activated  carbon  were  done  by  infrared spectroscopy  (IR)    and  gravimetric  method  acidity  test.  Conditions  of  adsorption  of glycerol  by  activated  carbon  were  carried  out  using  batch  method  with  ±12  hours  of contact time on the variation of adsorbate concentration or the ratio glycerol : water (v/v) 1 : 2, 1 : 3, 1 : 4, and 1 : 5, as well as variations in 30, 40, 50, and 60 oC.  The  result  showed  that  increased  activity  of  activated  carbon  increased  acidity from 0.5 mmol/gram  to 2.7 mmol/gram.  Increasing concentration of glycerol causes  the surface  tension  decreases  and  (∂γ/∂C)  becomes  negative with means  that  glycerol was adsorbed  over  the  surface.  It  has  been  confirmed  by  the  increase  of  actvated  carbon capacity is proportional to the increased concentration of glycerol. Temperature was also playing the role of glycerol adsorption where at 60 oC maximum adsorption was riched.   Keywords:  Adsorption,  Glycerol,  Adsorbate  concentration, Temperature,  Surface tension, Activated Carbon
Penentuan Efisiensi Immobilisasi Kromium (VI) Pada Geopolimer Abu Sekam Padi Dengan Uji TCLP (Toxicity Characteristic Leaching Procedure) Kun Sri Budiasih
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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This research aimed  to determine  the efficiency of immobilization of Cr(VI) on  the rice husk  ash  based  geopolymer with  a TCLP  (Toxicity Characteristic  Leaching Procedure)  study. The TCLP was    refer  to  the  standard method  from  Japan  Environmental  Agency. There were three  variables  used  i.e.,    concentration  of Cr(VI)  impregnated,  particles  size,  and  the  kind  of leaching  water. Determination  of  immobilization  efficiency  was  done  by  calculate  the concentration  of  Cr(VI)  in  the  leachate  water  after    the  leaching  processes.    Quantitative measurement of the chromium was done by Uv-Vis spectrometer with biphenyl carbazid  reagent. Immobilization of Cr(VI) on the rice husk ash based  geopolymer was establish until 25 ppm Cr impregnated. The efficiency of the immobilization can reach 90% - almost 100% depend on the variable of leaching processes.   Keywords: eficiency, immobilization, geopolimer, rice husk ash, TCLP study

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