cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Is Fatimah
Contact Email
eksakta@uii.ac.id
Phone
+6282326298724
Journal Mail Official
eksakta@uii.ac.id
Editorial Address
Faculty of Mathematics and Natural Sciences Universitas Islam Indonesia Jl. Kaliurang Km 14, Ngaglik, Sleman, Yogyakarta, 55584
Location
Kab. sleman,
Daerah istimewa yogyakarta
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 11, ISSUE 2, August 2010" : 9 Documents clear
Study of Quartz Activation, Effect of pH and Ion Fe2+ Concentration in Supporting Processes K.D. Nugrahaningtyas; D.M. Widjonarko; I.Y. Indriasari
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

Iron oxide supported in quartz had been done. This research were studied activation in quartz, effect of pH and ion Fe2+ concentration to the iron oxide formation in quartz and quartz itself. Activation were done using variation of activator concentration and time contact. The variation of activator concentration were 1 and 4M, and variation of the time contact were 15, 30, 60, 90 and 1440 minutes (24 hours). Quartz in optimum condition of activation was used for the supporting processes. Processes were conducted in ion exchange method. Supporting processes were done using variation of pH and ion Fe2+ concentration. The variation of pH were 5, 7 and 9, and variation of ion Fe2+ concentration were 0, 0,001, 0,005 and 0,01M. The sampels were analyzed using gravimetric and X-Ray Diffraction methods. The result showed that the acidity of quartz increased after activation comparing with quartz before activation. It means the activation sites formed in quartz. The activation reached optimum condition in activator concentration 1M and the time contact was 30 minutes. The result showed that supporting processes affected by pH and ion Fe2+ concentration. Iron oxide supported in pH 7 and 9, and maximum supported in concentration of ion Fe2+ 0,005M.     Keywords: iron oxide, quartz, activation, supporting processes, pH, ion Fe2+ concentration
Redox Reaction in the Cyclization-aromatization of (R)-(+)-Citronellal with FeCl3/Acetic Anhydride Edy Cahyono; Muchalal Muchalal; Harno Dwi Pranonowo
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

 The effects of temperature, time of reaction, and the reactants mole ratio on the cyclization-acetylation of (R)-(+)-citronellal with FeCl3/acetic anhydride were studied.  Isopulegyl acetate (IPA) and neoisopulegyl acetate (NIPA) were obtained as the main products at room temperature (mole ratio of citronellal: acetic anhydride: FeCl3 = 6:12:1). Both products are relatively fixed after the 30th minute. The average concentration of IPA at 30-180 minutes was 44.71%, while the average concentration of NIPA was 28.47%. Increasing temperature (80 oC) and the amount of acetic anhydride (mol ratio 2:6:1) gave p-cymene (17.53%) and citronellyl acetate (11.31%). Autoredoks reaction on the transformation of citronellal into p-cymene and citronellyl acetate was studied with the carbon oxidation number concept. Key words: (R )-(+)- citronellal, cyclization-aromatization, FeCl3,  p-cymene, redox
Characterization And Composition Liquid Smoke-charcoal-compost Bamboo Sawdust As Natural Pesticide Mohammad Wijaya M
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

The research goal is to produce liquid smoke through pyrolisis process and to get fractions of potential chemical components from bamboo wastes. Results of this research are expected to give benefits as follows: (1) Liquid smoke produced from wood and bamboo waste through pyrolisis process is able to diversify preservative products, (2) Rate reaction from value rate constanta by pyrolitic kinetic model resulted from this process can be used to find expected compounds in large quantities. Results of pyrolisis bamboo dust have the highest yield of liquid smokes as much as 18.18% in pyrolitic temperature of 200 C. The highest acid content of results of pyrolisis of bamboo dust with electrical reactor resulted at pyrolitic temperature of 400 C was 7,89%, whereas, in pyrolisis result of bamboo dust with electrical reactor was shown ar pyrolitic temperature of 500 C. In terms of the charcoal produced from pyrolisis process containing the highest yield was bamboo dust (33,28%). Identification of GC-MS of bamboo dust could provide compounds that mostly derived from acid group and was dominated by aceton, acetic acid, 3 hidroksi 2 butanone, icocyanat acid and n butana. Change kinetic model of bamboo wastes is energy activasi bamboo. The technology of integrated bamboo vinegar-charcoal-compost production hence deserved its dissemination throughout Indonesia, as pesticide natural.
Isolation And Identification Of Antioxidant Compounds Leaf Betel Seating (Piper sarmentosum Roxb. Ex Hunter) Hartiwi Diastutia; Eva Vaulina Yulistia Delsy
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

Sirih duduk or Piper sarmentosum Roxb. ex Hunter have been long used the people in Indonesia for traditional medicine to cure various diseases. This research was aimed to isolate and identify antioxidant compounds from P. sarmentosum leaves. The isolation bioactive compounds of P. sarmentosum leaves was performed by extraction the powder of P. sarmentosum leaves using methanol. The methanol extract was fractionated using n-hexane and ethylacetate in their various composition.  The fractions respectively was examined their antioxidant activity. The most active extract was fractionated again performed by coloumn chromatography Identification of the bioactive compounds was carried out using ultraviolet-visible (UV-Vis) spectrometry, infra red (IR) spectrometry and gas chromatography-mass spectrometry (GCMS). The result showed that the methanol extract of  P. sarmentosum leaves have antioxidant activity. The fractionation was performed by coloumn chromatography using n-hexane-ethylacetate (4:6) eluent, a bioactive compound of sinamic acid derivative was 4-ethoxy-2-hidroxy-3,5-dimethoxy sinamic acid could be purely isolated. Keywords: Piper sarmentosum, antioxidant, sinamic acid derivative.
Analisis Perubahan Kawasan Mangrove Berdasarkan Interpretasi Data Spasial Di Tn. Sembilang, Pantai Timur Sumatera, Banyuasin, Sumsel Yetty Hastiana; Fachrurrozie Sjarkowi; Dwi Anugrah; Rasjid Ridho
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

Due to the importance of mangrove ecosystem role to coastal area stability, study and research on mangrove ecosystem is interesting. Several study forms can be performed including by sightseeing and predicting degradation and change of mangrove conservation area during certain time. Result of prediction and analysis can be used by decision maker to state the priority of area protection. As intial step in management analysis for mangrove area ecosystem in Pasut area , TN. Sembilang Pantai Timur Sumatera, Banyuasin, SumSel,interpretation and identification can be performed during six years since it was stated as National park in 2003. Several techniques can be used for analyzing the ecosystem changes, one of these is by using remote sensing. In this research, remote sensing approach by landsat profile data from 2003 and 2009. The use of landsat data sequentially was aimed to interpret and identify changes in mangrove area during the time. Result of research showed that during six years there was changes and degradation mangrove ecosystem to be non mangrove of 14,57 %. This analysis hopely can be used as reference to apply wisdom and strategy of coastal area management . Analysis and strategic approach is become part of area optimation to reduce environmental pressures including biodiversity protection, coastal area protection also small islands from global climate change effect.Keywords: Spatial Analysis, Mangrove Ecosystem, Remote Sensing, TN. Sembilang SumSel.
Land Suitability Evaluation For Horticultural Commodities At The West Part Of Upland Lawu Puguh Karyanto; Rahayu Rahayu
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

This research is about to examine the site-suitability of horticultural plantation at the west part of Lawu. The research was conducted through a survey upon the cultivated horticultural commodities by comparing their agronomic prerequisite with measured climatic conditions and land performances. The research shows that the most critical determinant for the performed horticultural cultivation is the slope of the landscape. Hence, horticultural cultivation activities must emphasize for not to ignore the importance of standing crop and slopeland’s management.   Keywords: Land suitability evaluation. Horticultural commodities
Identifikasi dan Estimasi Runtun Waktu Model AR Menggunakan Algoritma Simulated Annealing Abdul Taram; suparman suparman
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

When fitting a Autoregressive (AR) model to real data, the correct model order and the model parameter often unknown. Our aim is to find estimators of the order and the parameter based on the data. In this paper the model identification and parameter estimation for AR model is posed within a Bayesian framework. Within this framework the unknown order and parameter are assumed to be distributed according to a prior distribution, which incorporates all the available information about the process. All the information concerning the order andparameter characterising the model is then contained in the posterior distribution. Obtaining the posterior model order probabilities and the posterior model parameter probabilitiesrequires integration of the resulting posterior distribution, an operation which is analytically intractable. Here stochastic simulated annealing algorithm is developed to perform therequired integration by simulating from the posterior distribution. The methods developed are evaluated in simulation studies on number of synthetic and real data sets.Keywords : simulated annealing, autoregressive, order identification, parameter estimation.
Antiangiogenic Effect Of The Chloroform Extract Of Tinospora crispa (L.) Miers Stem In The Chick Embryo Chorioallantoic Membrane (CAM) Induced By bFGF Asih Triastuti
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

Cancer is one of the most complex disease involving molecular process cause it is hard to be cured. There are many natural compounds which have been used empirically in the society in order to treat cancer. One of them is a kind of herbal medicine called ‘Brotowali’ (Tinospora crispa (L.) Miers). The objective of this research was  to know antiangiogenic effect of the chloroform extract of  brotowali stem using CAM method induced by bFGF. In this research, the inhibition test is done by the CAM at 9 day chick embryo divided  into  seven groups of treatment. Group I is  as the paper disc controller, group II as the bFGF controller, group III as  bFGF +  DMSO 0,8% solvent controller, group IV, V, VI and VII, as the group that conduct the angiogenesis inhibition test. The last four group were given 10 ng of bFGF each and the chloroform extract of brotowali stem with the doses of 15 μg/ml, 60 μg/ml, 240 μg/ml and 960 μg/ml. After having been incubated for 3 days (egg at 12 day), CAM were carefully observed  macroscopically and microscopically. The result showed that  the chloroform extract of brotowali stem can  inhibit the angiogenesis in CAM induced by bFGF. It show that the angiogenesis inhibition for the dose of the chloroform extract of  brotowali stem were successively rise  due to the dose increment, with angiogenic potency  31,87±9,01%,  43,12±8,01%, 53,44±2,70% and  62,81±4,74%.   Keywords : cancer, angiogenesis, Tinospora  crispa (L.) Miers, bFGF, CAM
Comparison on Isolation Technique of Vaninilin from Vanili Fruit (Vanilla planifolia Andrews Winarto Haryadi; Sri Handayani; Retno Arianingrum
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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

Abstract

Isolation of vanilin from vanili fruit by two method; maseration and Soxhlet using ethylacetate, ethanol and chloroform solvents has been investigated. Extraction result was hydrolized using sodium hydroxide by acidification using chloride acid. Filtrate was extracted by using chloroform and the targeted vanilin was separated by evaporation. Putrification was enganged by rechrystallization using aquadest-ethanol. Elucidation to the compound structure was performed by FTIR spectrophotometer, H-NMR, C-NMR, HMQC and HMBC. It is noted that vanilin isolation by soxhletazion procedure was more effective compared to maseration. Ethylacetate was more effective solvent than chloroform and conversely ethanol is inefective for the isolation.   Keywords: vanilin isolation, soxhlet isolation, maseration  

Page 1 of 1 | Total Record : 9

 1 

Filter by Year

2010 2010


Reset
Filter By Issues
All Issue VOLUME 6, ISSUE 2, October 2025 VOLUME 6, ISSUE 1, April 2025 VOLUME 5, ISSUE 2, October 2024 VOLUME 5, ISSUE 1, April 2024 VOLUME 4, ISSUE 2, August 2023 VOLUME 4, ISSUE 1, February 2023 VOLUME 3, ISSUE 2, August 2022 VOLUME 3, ISSUE 1, February 2022 VOLUME 2, ISSUE 2, August 2021 VOLUME 2, ISSUE 1, February 2021 VOLUME 1, ISSUE 2, August 2020 VOLUME 1, ISSUE 1, February 2020 VOLUME 19, ISSUE 2, August 2019 VOLUME 19, ISSUE 1, February 2019 VOLUME 18, ISSUE 2, August 2018 VOLUME 18, ISSUE 1, February 2018 VOLUME 17, ISSUE 2, August 2017 VOLUME 17, ISSUE 1, February 2017 VOLUME 16, ISSUE 2, August 2016 VOLUME 16, ISSUE 1, February 2016 VOLUME 15, ISSUE 1-2, 2015 VOLUME 14, ISSUE 2, August 2014 VOLUME 14, ISSUE 1, February 2014 VOLUME 13, ISSUE 1-2, August 2013 VOLUME 13, ISSUE 1, February 2012 VOLUME 12, ISSUE 2, August 2011 VOLUME 12, ISSUE 1, February 2011 VOLUME 11, ISSUE 2, August 2010 VOLUME 11, ISSUE 1, February 2010 More Issue