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Antioxidant and Anti-inflammatory Activities of Water and the Fermentation Liquid of Sea Tangle (Saccharina japonica)

다시마 물 추출액과 발효액의 항산화 및 항염증 활성

  • Received : 2019.01.30
  • Accepted : 2019.04.01
  • Published : 2019.05.30

Abstract

The study investigated the physiochemical properties and the antioxidant and anti-inflammatory activities of the sea tangle (Saccharina japonica) in a water extract before (STWE) and after (STFL) fermentation with Lactobacillus brevis. The pH values of STWE and STFL were 6.18 and 4.16, and the sugar contents were $8.50^{\circ}Brix$ and $7.40^{\circ}Brix$, respectively. The main free amino acids of STWE and STFL were glutamic acid, aspartic acid, and alanine, and the ${\gamma}$-amino butyric acid (GABA) content was increased by fermentation. The total polyphenol contents of STWE and STFL were 498.29 and 615.77 mg gallic acid equivalent (GAE)/ml, respectively. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities of STWE and STFL were markedly increased in a dose-dependent manner, and revealed about 89.89% and 96.94% activities, respectively, at 10% concentration (p<0.05). The superoxide dismutase (SOD) activities of STWE and STFL were also markedly increased in a dose-dependent manner, and the activity of STFL was significantly increased when compared with STWE (p<0.05). The anti-inflammatory activity was examined in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. STWE and STFL decreased the production of reactive oxygen species (ROS), which had levels of about 189.90% and 174.69% at 1% concentration, respectively (p<0.05). The contents of pro-inflammatory cytokines, such as tumor necrosis factor-alpha ($TNF-{\alpha}$) and interleukin-6 (IL-6), were decreased more by addition of STFL than by addition of STWE. The STWE and STFL showed high antioxidant and anti-inflammatory activity, and these activities were increased by fermentation. Therefore, sea tangle extracts can be used as functional food materials.

본 연구에서는 다시마 물 추출액과 유산균(Lactobacillus brevis)으로 발효한 다시마 발효액의 이화학적 특성 및 항산화 활성과 항염증 활성에 대하여 검토하였다. 다시마 물 추출액 및 발효액의 pH는 각각 6.18과 4.16이었고, 당도는 $8.50^{\circ}Brix$$7.40^{\circ}Brix$였다. 다시마 물 추출액과 발효액의 주요 유리아미노산은 glutamic acid와 aspartic acid 및 alanine으로 발효에 의해 glutamic acid는 감소한 반면 GABA의 함량은 증가하였다. 다시마 물 추출액 및 발효액의 총 폴리페놀 함량은 각각 $498.29{\mu}g\;GAE/ml$$615.77{\mu}g\;GAE/ml$였다. DPPH radical 소거능은 농도 의존적으로 증가하였으며, 10% 농도에서의 DPPH radical 소거능은 각각 89.89%와 96.94%로 나타났다(p<0.05). 다시마 물 추출액과 발효액의 SOD 활성 또한 농도 의존적으로 증가하였으며, 다시마 발효액의 경우 물 추출액보다 유의적으로 활성이 증가하는 결과가 나타났다(p<0.05). 나아가 LPS로 유도된 RAW 264.7 대식세포를 이용하여 항염증 활성을 검토하였다. 다시마 물 추출액과 발효액의 ROS 생성은 1% 농도에서 각각 189.90% 및 174.69%를 나타내었다. 또한, 염증성 cytokines인 $TNF-{\alpha}$$IL-1{\beta}$의 분비량은 다시마 발효액이 물 추출액보다 유의적으로 감소하는 결과가 나타났다(p<0.05). 이상의 결과에서와 같이 다시마 추출액과 발효액은 높은 항산화 및 항염증 활성이 있는 것으로 나타났으며, 특히 발효에 의해 그 활성이 증가하여 기능성 식품소재로서 활용이 가능할 것으로 사료된다.

Keywords

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Fig. 1. DPPH radical scavenging activity of sea tangle water extract and fermentation liquid.

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Fig. 2. Superoxide dismutase (SOD) activity of sea tangle water extract and fermentation liquid.

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Fig. 3. ABTS radical scavenging activity of sea tangle water extract and fermentation liquid.

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Fig. 4. Effects of sea tangle water extract and fermentation liquid on cell cytotoxicity in bacterial LPS-stimulated RAW 264.7 cells.

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Fig. 5. Effect of sea tangle water extract and fermentation liquid on intracellular ROS level in LPS-treated RAW 264.7 cells.

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Fig. 6. Effects of sea tangle water extract and fermentation liquid on NO synthesis in bacterial LPS-stimulated RAW264.7 cells.

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Fig. 7. Effects of sea tangle water extract and fermentation liquid on the production of TNF- α in RAW 264.7 cells.

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Fig. 8. Effects of sea tangle water extract and fermentation liquid on the production of IL-6 in RAW 264.7 cells.

Table 1. pH and sugar content (°Brix) of sea tangle water extract and fermentation liquid

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Table 2. Free amino acid contents of sea tangle water extract and fermentation liquid

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Table 3. Total polyphenol contents of sea tangle water extract and fermentation liquid

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