PRODUCTION OF GALACTAN FROM MARINE ALGA OF PORPHYRA

摘要

PURPOSE: To obtain agar-like galactan useful as a thickening agent or gelatinizing agent by treating marine algae of the genus Porphyra with an enzyme, decomposing cell wall thereof and extracting galactan from the treated material. ;CONSTITUTION: First, marine algae (e.g. Porphyra yezoensis Ueda) is treated with an enzyme (e.g. hemicellulase or cellulase) capable of decomposing cell walls of the marine algae. Then galactan is extracted from the algae treated with the enzyme generally by a method of boiling at 60-100°C under normal pressure in slight alkalinity or slight acidity for tens minutes to several hours. The enzyme treatment is done by using 0.1-10wt.% based on raw algae of the enzyme at 30-60°C at pH3-8 for 1-30 hours. Pretreatment of the algae with an alkali before the enzyme treatment preferably improves yield of galactan.;COPYRIGHT: (C)1993,JPO&Japio