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http://dx.doi.org/10.13000/JFMSE.2017.29.1.108

Properties of Porphyran and Hemicellulose extracted with Different extract Solutions and Enzymatic Pretreatments from Porphyra  

AN, Se-Ra (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
KOO, Jae-Geun (Kunsan National University)
Publication Information
Journal of Fisheries and Marine Sciences Education / v.29, no.1, 2017 , pp. 108-117 More about this Journal
Abstract
Laver, Porphyra, is distinctive for its high content of proteins and polysaccharides such as porphyran and hemicellulose. The chemical properties of the polysaccharides extracted with different extraction methods such as hot water, dilute acid(pH 4.0) or alkali solution(2N NaOH) were examined to investigate the suitable extraction conditions for porphyran and hemicellulose from laver. For porphyran extraction, dilute acid solution was more preferable to hot water and alkali solution because of its higher 3,6-anhydrogalactose content and lower protein content. However, alkali solution was more suitable to extract the hemicellulose because of higher mannose content indicating the extraction of mannan. To decrease contamination of the polysaccharides with protein, the dried lavers were pretreated with enzymes (Protamex, Flavourzyme, Alcalase, Viscozyme) before hot water extraction. All enzyme pretreatments increased the yield of polysaccharides by compared with control (enzyme unpretreated) and Flavourzyme pretreatment was most effective to decrease protein contamination in the polysaccharide. All viscosities of porphyran solutions pretreated by enzymes were lower compared to the control porphyran solution and showed pseudoplastic behavior with yield stress. In case of alkali extraction of residues obtained after enzyme hydrolysis and hot water extraction, protease pretreatment increased the mannose contents in the polysaccharide while the xylose content was increased by Viscozyme pretreatment.
Keywords
Laver; Porphyra; Extraction; Polysaccharide; Enzymatic pretreatment;
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Times Cited By KSCI : 8  (Citation Analysis)
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