Changes in M:G ratios of extracted and residual alginate fractions on boiling with water the dried brown algaKjellmaniella crassifolia(Laminariales, Phaeophyta)
✍ Scribed by Eiichi Nishide; Hirosi Anzai; Naozuki Uchida; Kazutosi Nisizawa
- Book ID
- 104623108
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 271 KB
- Volume
- 326-327
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
Kjellmaniella crassifolia, the edible macro-brown alga in Japan contained nearly 27% of alginates of which nearly 7% was extractable from the fronds with boiling water for 6 h and the residual alginates in the frond were almost exhaustively extracted with a dilute alkali at 60 °C for 6 h. The alginates dissolved in all these extracts with both boiling water and dilute alkali were purified by fractionation with MgC12 and alcohol .
The content of MM blocks in the boiling water-soluble alginate sample increased remarkably during heating for 6 h while that of GG blocks from the same sample decreased . In contrast, MM blocks in the alkali-soluble alginate sample decreased during 6 h heating while GG blocks continued to increase . Since the amounts of MG blocks showed slight fiuctation, the M :G ratio of alginates extracted with boiling water increased towards the end of extraction whereas the reverse is true for the alkali-soluble alginates .