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Tutiek Rahayu
FMIPA UNY
Decision Sciences, Operations Research & Management

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MECHANICAL PROPERTIES OF CELLULOSE BACTERIA FROM COCONUT WATER WITH ADDITION OF THE CHITOSAN Tutiek Rahayu; Eli Rohaeti
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (577.993 KB) | DOI: 10.21831/jps.v19i2.3498

Abstract

The objective of this research were to identify the chitosan concentration that produced bacterial cellulose-chitosan with optimum mechanical properties and to identtify the effect of chitosan addition for function group, cross section morphology, and crystallinity of bacterial cellulose based coconut water. Bacterial cellulose-chitosan has been succesfully prepared by immersing dry bacterial cellulose in chitosan solution 0.5; 1.0; 1.5; 2.0; 2.5; and 3.0% (m/v) for 6 hours. The films were characterized using tensile tester to identify mechanical properties, XRD (X-Ray Diffraction) to identify crystallinity, FTIR (Fourier Transform Infrared) to identify functional group, and SEM (Scanning Electron Microscope) to identify cross section morphology. The bacterial cellulose-chitosan 0.5% had the most optimum mechanical properties. The addition of chitosan could decrease elongation at break, and also increase strenght at break and modulus Young of bacterial cellulose. The crystalinity decreased with the addition of chitosan 0.5% from 30.43% to 15.38%. On the other hand, the FTIR spectrum showed that there was interaction between bacterial cellulose and chitosan molecule. SEM images show that bacterial cellulose consisted of tight fibrin thread, so it could form layers. Bacterial cellulose-chitosan 0.5% consisted of multilayered of bacterial cellulose and chitosan layers.
THE POPULATION OF AQUATIC SWEED AND AEDES SPP. AND THE DISTRIBUTION PATTERN OF DENGUE FEVER DISEASE Tien Aminatun; Tutiek Rahayu; Victoria Henuhili
Jurnal Penelitian Saintek Vol 21, No 1: April 2016
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1286.28 KB) | DOI: 10.21831/jps.v21i1.10556

Abstract

The study was aimed at fi nding out the abundance of aquatic weeds in Rowo Jombor, the population of Aedes spp live in aquatic weed area, and the distribution pattern of dengue fever disease related to the population of aquatic weed and Aedes spp. Field survey was conducted for two months to collect the weed population data, mosquito larvae density, and environmental sanitation condition of the villages around Rowo Jombor. The study used quantitative descriptive analysis to see the correlation among weed density, Aedes spp population. The interview was conducted to make its distribution pattern.The results show that: (1) the density of aquatic weeds in Rowo Jombor was dominated by Eichornia crassipes mainly on Location V near he outlet, while the Location III which was located in the center of the swamp, the aquatic weed was not found; (2) the larvae of Aedes spp population which lived in aquatic weed area was not found; and (3) the result could not prove the relationship between the pattern of dengue fever disease distribution and the aquatic weeds in Rowo Jombor as the habitat for mosquito larvae of Aedes spp.
Co-Authors Eli Rohaeti Tien Aminatun Victoria Henuhili