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Jajang Juansah
IPB
Biochemistry, Genetics & Molecular Biology

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SIFAT LISTRIK MEMBRAN SELULOSA ASETAT - TITANIUM DIOKSIDA Jajang Juansah
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
Publisher : Jurnal Biofisika

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Abstract

Membrane  is  a  semiperiable  tissue.  Now  days,  the  technology  of  membrane  is commonly  used  for  separation  process.  Research  membrane  filtration  process  is mostly done,  but  the  investigations of their  electrical properties are  rarely  performed. Electrical  properties  of  membrane  were  investigated  by  using  measurement  of current-voltage, capacitance, and impedance phenomenon at low alternating current. The  more  value  of  frequency  of  signal,  the  more  of  conductance  value.  The capacitance  and  impedance  were  decreased   If  frequency  was  inclined.  The  TiO2 addition  in  cellulose  membrane  couse  the  electrical  properties  of  membrane changes.  It  was  happen  until  optimum  value  TiO2.  The  differences  in  electrical parameters was shaw clearly in the range of 10 Hz to 1 kHz.
POTENSI METODE OPTIK UNTUK PENDUGAAN KANDUNGAN ANTOSIANIN PADA BUAH BLACK MULBERRY DAN STROBERI Jajang Juansah
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
Publisher : Jurnal Biofisika

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Abstract

Estimation  of  pigment  in  plant  tissues  can  be  studied  from  optical  properties. Reflectance spectra of optics signal on black mulberry and strawberry fruit have been studied for nondestructive estimation of anthocyanin pigment content. In addition, the absorbance spectra were also studied in fruit extracts with different solvent types, ie: a combined solution of tartaric acid  and ethanol  -  chloric acid.  The results showed that there is energy absorption for  chlorophyll a in the blue area, i.e.: 465 nm-  black mulberry  and  478  nm-strawberry.  While  the  energy  absorption  for  chlorophyll  b occurs in the red region with a wavelength of 650 nm  (black mulberry) and 655 nm (strawberry). Maximum peak absorbance of anthocyanin pigments of black mulberry fruit with tartaric acid solvent had occurred at 515 nm. While  for the solvent ethanol  -hydrochloric acid has occurred at a wavelength of 519 nm.
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