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http://dx.doi.org/10.5657/kfas.2003.36.5.474

Seasonal and Regional Variations of Agar Yield and Properties of Tetrasporophytes and Gametophytes in Korean Gracilaria verrucosa  

KIM Young Sik (Faculty of Marine Life Science, Kunsan National University)
KOO Jae-Geun (Faculty of Applied Ocean Science and Technology, Kunsan National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.36, no.5, 2003 , pp. 474-479 More about this Journal
Abstract
The effect of season, life stages and harvesting sites on the yield and properties of agars extracted from Gracilaria verrucosa were determined. G. verrucosa were collected seasonally from November 2001 to August 2002 at Cheongsapo and Boryong, Korea. The plants were sorted Into the different life stages (tetrasporophytes and gametophytes) and dried at $60^{\circ}C.$ The yield, sulfate, protein, uronic acid and 3,6-anhydrogalactose of the agar were determined, and standard parameters of physical quality were measured. No differences were found in yield and properties of agars from the two different harvesting sites and from lift history phases. The yield of agar was maximum in summer $(17.3-20.0\%)$ and minimum in winter $(11.9-13.1\%).$ Maximum gel strength occurred in winter when the agar yield and sulfate content were low. Gel strength was negatively correlated with agar yleld. Seasonal variations in agar yield and its quality were discussed in a view to managing the exploitation of this resource.
Keywords
Gracilaria verrucosa; Tetrasporophytes; Gametophytes; Agar; Seasonal variation;
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