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INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 13, No 1: April 2008" : 6 Documents clear
TEST ACTIVITIES SOME COMPOUNDS OLIGORESVERATROL RESULT OF INSULATION OF SKIN HOPEA ODORATA PLANT AS PREVENT 2-DEOKSIRIBOSE DEGRADATION Sri Atun
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.71 KB) | DOI: 10.21831/jps.v13i1.183

Abstract

The objective of the study were measured inhibitory of 2-deoxyribose degradation activity of balanocarpol (1), ampelopsin H (2), hopheaphenol (3), and hemlesyanol C (4) which are resveratrol compounds from isolation of stem bark of Hopea odorata, and to study of different activity as 2-deoxyribose degradation activity from this compounds. Methods of this study to measured 2-deoxyribose degradation activity test with Fenton reaction method. Activity of 2-deoxyribose degradation activity calculated as percentage absorbansi decreased sample with bioactive compounds compared with a blank. As positif control used vitamin C and BHT (Butylated Hydroxy Toluena). The result of this study showed activity each compounds as 2-deoxyribose degradation activity of balanocarpol (1), ampelopsin H (2), hopheaphenol (3), and hemlesyanol C (4) with an IC50 1802,3; 4840,0; 61,8 and 425,5 mg/ml respectively. Hopeaphenol (3) showed more active than vitamin C (IC50 83,9 mg/ml) and BHT (1328,1mg/ml)
EFFECT OF VARIOUS MEASURES ON POWER ADSORPTION ION KROMIUM (III) AND COLOMUM (VI) IN LAND DIATOMAE Susila Kristianingrum; Siti Sulastri
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (98.233 KB) | DOI: 10.21831/jps.v13i1.184

Abstract

This research was done in Chemistry Laboratory FMIPA UNY. The aim of this research is to know the effect of diatomaeous earth soaking in a such acid on its adsorption power for heavy metal chromium(III) and chromium(VI) ions.The subject of this research is the diatomaeous earth from Sangiran Village, Sragen, Jawa Tengah. The object of this research is the diatomaeous earth properties soaking in such acid. Independent variables of this research are acid type, acid soaker concentration and the type of metal ion adsorbed. Dependent variable is its adsorption power for heavy metal chromium(III) and chromium(VI) ions. Experiment procedure consists of some steps: preparation, the diatomaeous earth treatment on chloride acid, nitric acid, and sulphuric acid, properties of the diatomaeous earth adsorbent for chromium(III) and chromium(VI) investigation. FTIR analyzing on original and treated diatomaeous earth and AAS analyzing to determine chromium(III) and chromium(VI) concentration before and after being diatomaeous earth soaker.The conclusion from this research was the diatomaeous earth soaking on such acids can caused adsorption power differences. Optimum adsorption power for chromium(III) occurred on a half concentrate chloride acid soaking (18.50%), concentrate nitric acid (65%), and concentrate sulphuric acid ((96%). Optimum adsorption power for chromium(VI) occurred on a half concentrate chloride acid soaking (18.50%), half concentrate nitric acid (32.50%), and an eight concentrate sulphuric acid (12%). Both original and treated diatomaeous earth has a similar FTIR spectrum pattern.
Cr-Fe KOADSORPSI BY KITOSAN Endang Widjajanti; AK Prodjosantoso
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (112.095 KB) | DOI: 10.21831/jps.v13i1.185

Abstract

This study aims to determine the ability of adsorption of chitosan on Cr (III) and Fe (III) ions simultaneously in various concentration variations. As research subject is chitosan isolated from crab shells and made through three stages namely deproteination stage, demineralisasi and deasetilasi. As the object of research is the adsorption power of chitosan against Cr (III) and Fe (III) metal ions, both for each ion and simultaneously. The adsorption process using a batch system is carried out for 24 hours at room temperature under optimum pH system conditions with a 1: 100 (w / v) adsorbent ratio at concentrations of 100 ppm to 1000 ppm. Chitosan adsorption is the ratio between the amount of metal ions adsorbed per gram of chitosan, adsorbat concentration is determined using Atomic Absorption Spectrophotometer The results showed that the adsorption capacity of chitosan on Fe (III) was stronger than Cr (III) in both single adsorption and simultaneous adsorption, and the process was classified as coadsorption.
PUTILIZATION OF PETROCK OIL AS ALTERNATIVE FUEL MACHINES DIESEL - Suhartanta; Zaenal Arifin
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (235.37 KB) | DOI: 10.21831/jps.v13i1.181

Abstract

This study aims to determine the characteristics of jatropha oil biodiesel, both in terms of physics and chemistry. Biodiesel is attempted to be used as a diesel fuel substitute for diesel motors. Further analyzed differences in the performance of diesel motors when using jatropha oil biodiesel fuel and when using diesel.In its implementation, this research begins by examining jatropha oil biodiesel characteristics physically and chemically. Once tested its characteristics, the fuel is used directly on diesel engines to measure opacity, torque, power, and the amount of fuel consumption and then compared with the use of diesel fuel. The comparison analysis of jatropha oil and diesel biodiesel characteristics was all submitted to UGM Chemical Engineering Laboratory. Furthermore, for the measurement of exhaust emissions, torque, power, and fuel consumption is submitted to the Energy Conversion Laboratory of Mechanical and Industrial Engineering Department of FT UGM. Based on the analysis of fuel characteristics, it is found that biodiesel developed as diesel engine fuel derived from jatropa oil (Jatropa Curcas L.) has the same characteristics even on some items that is on the analysis of heating value has better characteristics compared with diesel. The amount of exhaust emissions in the form of the concentration of smoke (opacity) has the greatest decrease, ie the average decrease obtained by 82%, with the best mixture at fraction of 20% .The magnitude of torque resulting from jatropha oil biodiesel testing after compared with diesel at various fractions of the mixture obtained results that the resulting torque increased by an average of 19%. The highest torque was obtained in 20% biodiesel mixture. Furthermore, the amount of power generated from the biodiesel usage of the engine produces a rise in power in the shaft at various rpm variations, and the fraction of the biodiesel mixture has an average power increase of 19%, with the highest power being obtained in the 20% mixture. Fuel consumption for Jatropha curcas biodiesel experienced an average decrease of 24.2% with the best fraction obtained in the 20% mixed fraction.
EVALUATION OF YIELD SEDIMENT IN FLOW AREA RIVER RIVER PART IN ESTABLISHING THE REST OF DADMA WAREHOUSE Muhammad Nursa'ban
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (137.788 KB) | DOI: 10.21831/jps.v13i1.182

Abstract

The objective of this research are to: 1). Knowing the level of erosion that happened in the upstream of Cisanggarung Catchments' area. 2). Knowing the level of Sediment Yield in Darma reservoir. 3). Determining the estimation age left Darma reservoir.This is the explorative research. Data collecting was conducted with observation method and documentation. Calculating of total erosion summing factors from surface erosion with dale erosion and channel erosion which level of is 25% from surface land;ground erosion that is using Universal approach [of] Soil Loss Equation ( USLE), while calculation of total erosion that is factor losing of land;ground. Erosion enabled to be to be analysed by conversion each;every land;ground erosion criterion enabled with tables guidance of stipulating of value of T for land;ground in Indonesia, is later;then multiplied 10 and land;ground volume weight. Analyse Sediment Yield [counted/calculated] high [of] water [at] highest terendah level until, river stream debit when different, and high [relation/link] and debit irrigate to adrift sediment ( Load Suspended) and sediment creep ( Bed Load), and also debit [relation/link] irrigate with Sediment Yield. Rest of Accumulating basin of Darma known from sediment amount closing over dead accommodationResult research of menunjukan that surface land;ground erosion storey;level that is 31.558,74 ton / year, or mean 573,795 ton/ha/tahun, total erosion 39.448,43 ton / year or 717,244 enabled land;ground erosion and ton/ha/tahun that is 686,033 ton / year or [about/around] 12,473 ton/ha/tahun. datas [of] menunjukan that surface erosion storey;level and total erosion take place big compared to high enough [of] enabled erosion. annual Sediment Yield [in] Accumulating basin of Darma that is 32.996,419 ton / year or 14.873,660 m3. Accumulating basin of Darma cannot function again that is at the (time) of reaching umur ± 84,25 year. Year 2006 Accumulating basin of Darma have operated during 36 year so that the rest of Accumulating basin of Darma fufilled [by] dead accomodation him by sediment that is ± 48,25 dead accomodation or year will loaded full (of) that is [at] year ± 2054.
POTENTIAL LEAF CORN AS A SOURCE OF NATURAL DYES AND STABILITIES DURING DRYING POWDER USING BINDER MALTODEKSTRIN Sri Hardjanti
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (136.123 KB) | DOI: 10.21831/jps.v13i1.180

Abstract

Leaves katuk (Sauropus Androgynus- (L) Merr) is a leaf that can be used as a dye in food, but its use is less practical, therefore it is done by processing leaf katuk extracted and then made into powder. The research variables of katuk leaf powder were made with the addition of maltodectin at variation concentration 4%, 6%, 8%, and drying temperature 80 and 900C. The leaf powder obtained obtained katuk analyzed chemical properties (water content, chlorophyll content), physical properties (color, rehydration) and sensory properties (favorite level). The results showed that the addition of maltodextrin on katuk leaf extract powder tended to have no effect on physical properties (color and rehydration), chemical properties (moisture content, chlorophyll content) but more maltodextrin addition, leaf katuk leaf extract produced less favorable. The drying temperature of katuk leaf extract powder significantly influences chlorophyll content and color intensity on katuk leaf extract powder. The leaf extract powder of katuk is most preferable at 900 C drying temperature with the addition of 4% maltodextrin. Powder of katuk leaf extract has characteristics: water content 5.64% wb, chlorophyll content (0.83% db), Redness color 0.65, Yellowness 8.90, Blueness 2.75; rehydration 1.19 minutes.

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