NDLI: Gel-forming structures and stages of red algal galactans of different sulfation levels

Content Provider	Springer Nature Link
Author	Tuvikene, Rando Truus, Kalle Kollist, Andres Volobujeva, Olga Mellikov, Enn Pehk, Tõnis
Copyright Year	2007
Abstract	Sol-gel transition processes of algal galactans were studied using cryofixation method in combination with freeze-drying and scanning electron microscopy (SEM) techniques. The structures formed in successive stages of gelling process upon cooling were rapidly frozen at defined temperature points and viewed by SEM. It was established that in the case of both types of gelling galactans investigated, a fine honeycomb-like network exists for a wide range of solution temperatures. The formation and structure of this network depends on the structural type, gelling stage, and concentration of the galactan in solution. The honeycomb suprastructures exist also in carrageenan and agarose sols (at temperatures considerably exceeding the gelling temperatures). An additional helical network formed showed different behaviour in the case of carrageenan and agar-type polysaccharides. In the gel-formation process, tightening of the network takes place in both types of galactan gels; the honeycomb structures persist in carrageenan (furcellaran) but not in agarose gels.
Starting Page	527
Ending Page	535
Page Count	9
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	20
Issue Number	5
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-08-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agarose Furcellaran Gel structure Gelling process Scanning electron microscopy Ecology Plant Physiology Freshwater & Marine Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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