Effects of Drying Methods on Content and Properties of Polysaccharides in <i>Laminaria japonica</i>

LU Dong-he; CHEN Qing-hua; CHEN Shen; HUANG Ying-ying; YANG Dao-fu; YANG Cheng-long

doi:10.19303/j.issn.1008-0384.2020.04.013

Volume 35 Issue 4

Apr. 2020

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Article Navigation > Fujian Journal of Agricultural Sciences > 2020 > 35(4): 450-455

LU D H, CHEN Q H, CHEN S, et al. Effects of Drying Methods on Content and Properties of Polysaccharides in Laminaria japonica [J]. Fujian Journal of Agricultural Sciences，2020，35（4）：450−455 doi: 10.19303/j.issn.1008-0384.2020.04.013

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LU D H, CHEN Q H, CHEN S, et al. Effects of Drying Methods on Content and Properties of Polysaccharides in Laminaria japonica [J]. Fujian Journal of Agricultural Sciences，2020，35（4）：450−455 doi: 10.19303/j.issn.1008-0384.2020.04.013

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Effects of Drying Methods on Content and Properties of Polysaccharides in Laminaria japonica

doi: 10.19303/j.issn.1008-0384.2020.04.013

1.
Institute of Agricultural Engineering Technology, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory of Agricultural Products (Food) Processing, Fuzhou, Fujian　350003, China
2.
Putian Houhai Reclamation Area Modern Agricultural Development Co., Ltd., Putian, Fujian　351166, China

Received Date: 2019-10-29
Rev Recd Date: 2019-12-30
Publish Date: 2020-04-01

Abstract

Abstract

Objective Effects of various dehydration methods on the content and physiochemical properties of polysaccharides in the dried Laminaria japonica were studied. Method Fresh L. japonica was dried by applying 2 W·g⁻¹ microwave-and-vacuum (MV1), 4 W·g⁻¹ microwave-and-vacuum (MV2), vacuum (VD), hot air (HA) or solar exposure (SE). Yield, SO₄²⁻, viscosity, scavenging activities on hydroxyl and superoxide anion free radicals of the polysaccharides in the dried kelp were determined. Result Among the tried drying methods, SE produced kelp significantly lower on the yield (i.e., 7.87%), SO₄²⁻ content, viscosity, as well as the in vitro antioxidant activity of polysaccharides in L. japonica than HA or VD (P＜0.05). On the other hand, MV2 rendered dried kelp with the highest polysaccharides content at 13.83%, while MV1 with the greatest antioxidant activity (P＜0.05). Conclusion Different drying L. japonica methods resulted in varied properties of the polysaccharides and kelp. By combining microwave and vacuum, the dehydration process maximally retained the functional components and antioxidant activity of the fresh kelp.
- Drying,
- vacuum and microwave,
- Laminaria japonica polysaccharide,
- in vitro antioxidant activity

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References(23)

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