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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 7 Documents

Search results for , issue "Vol 16, No 2: Oktober 2011" : 7 Documents clear

SITOTOXIC TESTS OF SOME MONO COMPONENTS OF COCON HYDROXES ON CANCER CELL LINE T47D Retno Arianingrum; Indyah Sulistyo Arty; Sri Atun
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research was to study cytotocix activity from some mono para hydroxy compounds (MPHC) i.e. MPHC A, MHPC B, MPHC MPHC D, and MPHC E against T47D cancer cell lines. Those compounds were synthesized from benzaldehyde derivatives and acetofenon derivates through cross aldol reaction under acid condition. Separation and purification of these compounds were conducted by recrystallization technique using suitable eluent. Identification and structure elucidation was done by comparing the data of thin-layer chromatography (TLC) with marker (compounds that have been found previously), and also used the data of IR spectrum. Each compound then was performed cytotoxicity test by in vitro against T47D cells using MTT assay. Observation of cell morphological changes was observed using phase contrast microscopy. The results showed that the compound MPHC A, MPHC B, MPHC C, and MPHC D had cytotoxic activity against T47D cancer cell line, while the compound MPHK E did not have cytotoxic activity. The highest toxicity was MPHK A with LC50= 66.44 Pg/mL. The presence of hydroxyl groups contributed to the enhancement of cytotoxic effect.

ENERGY USE PERFORMANCE IN THE BUILDING COOLING SYSTEM USING A TERMOSTAT CONTROL, ON / OFF DIGITAL AND FUZZY LOGIC Henry Nasution
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

In this study, an alternative solution to reduce energy consumption in building airconditioning system is proposed and introduced. The operation and energy consumption of the system operated as either with the new control system or with the traditional on/off control were compared. Measurements were taken during the experimental period at a time interval of one minute for a set point temperature of 22 and 23o C. The room temperature, energy consumption and energy-saving ware analyzed. The main objective is to determine the amount of energy saved when a digital on/off and fuzzy logic controller is applied to the air-conditioning system. The experimental results show that significant energy savings of approximately 24 to 43% for digital on/off and 48 to 73% for fuzzy logic control were obtained. The results also indicated that the digital on/off and fuzzy logic control can save energy and improve indoor comfort significantly for building AC system compared to the thermostat control technique.

LANTANUM COMPLEXASI STUDY WITH MAKROSIKLIS COMPOUND AND CHARACTERIZATION AS SELECTIVE ELECTRONIC ION LANTANUM Suyanta Suyanta; Sunarto Sunarto; Lis Permana Sari
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research are (1) to study the complexation constant of La(III) ion by N,N’-dikarboksimetildiaza-18-crown-6 ligant with difference concentration of KNO3, and (2) to study the lanthanum (III) ion selective electrode (La-ISE) potential response which follows the Nernst equation. The characters of the electrode studied are: response time, life time, detection limit, dynamic range and selectivity. The complexation constant of La(III) ion by N,N’- dikarboksimetildiaza-18-crown-6 ligant are finded by potentiometry titration with 0.0005 M, 0.001 M, dan 0.005 M KNO3 supported electrolite. The titration are doing by 0.00794 M KOH until pH 7. The result of constant complexation (Kf) La(III) ion with N,N’-dikarboksimetildiaza-18-crown-6 difference KNO3 0.005 M, 0.001 M, dan 0.005 M simultaniuesly are 101,02 , 101,12, dan 101,32. The electrode had a response time of 27.14 ± 4.79 seconds and could be used for 50 days. The linear range was between 10-5 M to 10-1 M and the detection limit is 3.92x10-6 M.

ANALYSIS OF POWER PLANT MICROHYDRO (PLTMH) ON RIVER FLOWS ON MONGONDOW RIVER IN MUNTOI VILLAGE REGENCY OF BOLAANG MONGONDOW Parabelem T.D. Rompas
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The microhydro power plant (PLTMH) has been analyzed. The objectives of the research are to get water power capasity of PLTMH and electric energy in a year. The data was collected by direct observation in the field. It’s found that water power capasity of PLTMH and electric energy in a year are 19.5 kW and 170.829 MWh.

SYNTHESIS AND CARATERIZATION OF SNO2 AS A DEVELOPMENT EFFORTS WHITE TIN PRODUCTS TO IMPROVE NATIONAL DEVISES Anti Kolonial Prodjosantoso; Endang Widjajanti Laksono; M. Pranjoto Utomo
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Long-term goal of this research is to apply nanotechnology in the development of downstream products of tin to increase the national foreign exchange. As a preliminary study, SnO2 was synthesized by dissolving tin metal in concentrated HCl followed by addition of concentrated NH4OH in dropwise. The precipitate was filtered, dried, and partially characterized using IR spectrophotometer FTIR-8300/8700 model in the range of wave number of 400 cm-1 to 4000 cm-1, whilst the rest was then heated in a furnace at temperature about 900 °C for 4 hours. The oxide was then cooled and characterized by using XRD Zhimadsu S6000 diffractometer using monochromatic Cu KĮ radiation with a wavelength (Ȝ) of 1.5406 Å in the 2ș range 5o to 90o , and scanning electron microscope (SEM) JEOL T330 A operating at 15 keV. The crystallography aspects of SnO2 was studied based on the X-ray diffraction data (XRD) which was analyzed with Rietveld method using the WinPLOTR program. The SnO2 oxide was found to be tetragonal P42/mnm space group having lattice parameters of a = b = 4.7337(2) ǖ and c = 3.1841(3) ǖ. The particle size of the SnO2 oxide was found to be about 35.39 nm.

BIOPLASTIK NATA DE CASSAVA AS MATERIAL EDIBLE FILM ENVIRONMENTALLY FRIENDLY Heru Pratomo; Eli Rohaeti
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aimed to synthesize friendly plastic by using waste. Waste from cassava is made nata with using acetobacter xylinum. Characterizations of bioplastics were functional groups using IR, thermal properties using Differential Thermal Analysis, crystallinity using X-Ray Diffractometry, mechanical properties i.e. strength at break and strain at break, surface observing by using Scanning Electron Microscopy and biodegradation test using activated sludge. The primary component of nata de cassava was cellulose polymer. That is showed by functional groups i.e. –OH free, C-H allifatic, C-O, structure of piran ring, and ȕ-1,4-glikosidik link. That cellulose is supported by XRD diffractogram for film, film of nata de cassava had crystalline phase 1D and 1E at 15° dan 22,5°. The pellicle of cellulose is also supported SEM photo. Nata de cassava was stable film thermally, is showed by 20% of mass loss at 400°C. The biodegradation caused breaking of ȕ-1,4-glikosidik link until cellulose molecule dissociated to glucose molecules.

INCREASING CAROTEN IN SWEET BREAD WITH PUREE SUBSTITUTION OF ORANYE ORDER PALM IN WHEAT FLOUR Ichda Chayati
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The objectives of this study were to investigate : 1) the process for making orange-fleshed sweet potato puree, 2) substitution of orange-fleshed sweet potato puree to wheat flour in bread making, 3) evaluation of consumer preference to bread of orange-fleshed sweet potato puree (roti manis puree ubi jalar oranye-RMP), 4) total carotene changes during RMP making, 5) total carotene and texture differences between bread (roti manis standar-RMS) and RMP, and 6) economic liability of RMP. Hedonic test was carried out by preference test using 80 panelists. Moisture content was analyzed using gravimetric method, texture was analyzed using Lloyd, and total carotene content was analyzed using spectrophotometer method. Research design was completely randomized design, duplicate samples and triplicate analysis. One way anova was carried out to analyze data of total carotene and followed by LSD test, while t-test was carried out to determine significant differences of total carotene and texture between RMS and RMP. P values 0.05 were considered statistically significant. Economic liability was determined using price and BEP. Results showed that: 1) processing steps for making puree were cleaning, steaming, peeling, and mashing, 2) maximal incorporation of puree for making RMP was 60%, 3) consumer preference to RMP 60% was the same as to RMP 40 and 50%, 4) total 13 110 carotene decreased 37,9% during RMP making, 5) total carotene of RMP was higher than RMS, while the texture was softer, and 6) RMP was economically liable.

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