Functional group dependent dielectric properties of sulfated hydrocolloids extracted from green macroalgal biomass.
Dielectric properties of aqueous solutions of sulfated hydrocolloids (ulvan and rhamnan sulfate) extracted from green macroalgal biomass were studied in a frequency range of 100 MHz-10 GHz. Counterion exchange of native hydrocolloids (mixture of Na(+), Mg(2+) and Ca(2+)) to H(+)-form showed significant increase in loss factor due to ionic conduction. On the other hand, desulfations decreased their loss factors. The results suggested that ionic conduction of H(+) has significant contribution to loss factors. Additionally, H(+)-form hydrocolloids showed significant improvement in hydration, which might also affect the dielectric property of the solution by reducing the amount of free water. The viscosity, however, did not show apparent relevance with the dielectric property.
Oceanography Section, Science Research Center, Kochi University, Akebono-cho 2-5-1, Kochi, Japan. Electronic address: stsubaki@kochi-u.ac.jp.
Shuntaro
S
Tsubaki
Oceanography Section, Science Research Center, Kochi University, Akebono-cho 2-5-1, Kochi, Japan; Usa Marine Biological Institute, Kochi University, Inoshiri, Usa, Tosa, Kochi, Japan.
Masanori
M
Hiraoka
Department of Applied Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi, Japan.
Shingo
S
Hadano
Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan.
Hiroshi
H
Nishimura
Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan.
Keiichiro
K
Kashimura
Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan.
Tomohiko
T
Mitani
D018533:Biomass; D000460:Chlorophyta / Q000737:chemistry; D003102:Colloids; D003837:Deoxy Sugars / Q000737:chemistry* / Q000302:isolation & purification*; D017097:Electric Impedance; D008351:Mannans / Q000737:chemistry* / Q000302:isolation & purification*; D058086:Microalgae / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification*; D013431:Sulfates / Q000737:chemistry*; D044445:Ulva / Q000737:chemistry; D014783:Viscosity; D014867:Water / Q000737:chemistry
D003102:Colloids; D003837:Deoxy Sugars; D008351:Mannans; D011134:Polysaccharides; D013431:Sulfates; C571831:ulvan; D014867:Water; C065836:rhamnan
Dielectric property; Green macroalgae; Rhamnan; Sulfated polysaccharide; Ulvan