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KMID : 1134820230520060547
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Journal of the Korean Society of Food Science and Nutrition
2023 Volume.52 No. 6 p.547 ~ p.555
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Brown Seaweed-Derived Polysaccharides: Comparison of the Extraction Methods by Determining the Physicochemical Properties and Antioxidant Activity
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Ko Ka-Yeon
Kang Min-Hyeok
Jang Tae-Yeoub
Jiamei Cui
Zhang Guiguo
Lee Yun-Kyoung
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Abstract
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Seaweed polysaccharides (SPS) as emerging potential resources for health-promoting effects have been intensively studied. However, to apply SPS as health functional materials, it is essential to apply a suitable purification process that enables removing the heavy metals contained in seaweeds. This study aimed to optimize the extraction methods for isolating polysaccharides by eliminating heavy metal contents and maximizing the extraction yield. Three types of seaweeds were subjected to extraction: Hizikia fusiforme (HF), Laminaria japonica, and Undaria pinnatifida sporophyll. The intermediate products of the extraction process before and after dialysis were named crude polysaccharide (CP) and purified polysaccharide (PP), respectively. Dialysis effectively removed the heavy metals from the CP, whereas the yield of PP was significantly decreased compared to yields obtained in CP. Modification of the extraction procedure by combining boiling and washing steps successfully eliminated the heavy metals and maintained an appropriate yield of SPS. Among the three SPS obtained, the total polyphenol contents of CP and PP were comparable, with the highest polyphenol contents detected in the HF-derived polysaccharides. The antioxidant activities of all three SPS determined by ABTS radical scavenging activity and hydroxyl radical scavenging activity were also in agreement. In addition, the α-glucosidase inhibitory effect of the SPS was found to be the highest in the HFCP and HFPP extracts. Taken together, this comparative analysis between CP and PP of three kinds of SPS demonstrates that CP obtained by the modified extraction method can be utilized as a safe ingredient for future animal studies.
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KEYWORD
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brown seaweed, polysaccharide, physicochemical, extraction method, antioxidant
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