期刊
BOTANICA MARINA
卷 49, 期 1, 页码 57-64出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/BOT.2006.007
关键词
average molecular weight; carrageenan; Kappaphycus striatum sacol; tissue age
Carrageenan yield and quality from young and old tissues of Kappaphycus striatum sacol green variety were investigated using native and alkali-modified carrageenan extraction procedures. Dried apical (young) and basal (old) segments were pooled to produce 5 g of dried samples of each for carrageenan extraction. Mature tissues yielded greater amounts of carrageenan than young tissues. The latter exhibited higher gel strength, cohesiveness, viscosity properties and lower average-molecular weight than the mature, old tissues. FT-IR and C-13 and H-1 NMR analyses showed that both young and old tissues contained mostly the kappa-type repeating disaccharide sequences of 3-linked beta-D-galactopyranose 4-sulfate (G4S) and 4-linked 3,6-anhydro-alpha-D-galactopyranose (DA). Moreover, the study showed that, as the algal thalli aged, the iota carrageenan (G4S-DA2S) and methlylated (G6M) carrageenan units (these were minor substituents in the major kappa-carrageenan repeating disaccharide unit) decreased in quantity. These differences suggest that the timing of galactan biosynthesis may be related to certain physiological and structural functions during the growth of the alga.
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