title: Emulsifying ability of porphyran prepared from dried nori, Porphyra yezoensis, a red alga.
abstract: A suspension of low-quality dried nori processed from Porphyra yezoensis, a red alga, was autoclaved at 120 degrees C for 30 min, and from the supernatant, five preparations of porphyran of differing molecular masses and chemical compositions were obtained by preprecipitation with ethanol at stepwise-increasing concentrations of 50 and 67% followed by size-exclusion chromatography. The porphyran preparations exhibited a high emulsifying activity index and high emulsion stability over a wide range of pH and temperature and also in the presence of sodium chloride. An adequately high coefficient of correlation between the median diameter of oil droplets and their 3,6-anhydrogalactose content suggests that 3,6-anhydrogalactose could take part in emulsification with porphyran.
authors.affiliation: Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan. k-taka@cc.tuat.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Hirano
authors.forename: S
authors.initials: S
authors.lastname: Araki
authors.forename: M
authors.initials: M
authors.lastname: Hattori
mesh_terms: D005079:Excipients / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D000461:Rhodophyta / Q000737:chemistry*; D012685:Sepharose / Q000031:analogs & derivatives* / Q000302:isolation & purification
chemical_list: D005079:Excipients; C038549:porphyran; D012685:Sepharose