• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.698-704
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• 2020

Although various biological extracts derived from the resources from Jeju are currently being developed for cosmetic materials, few studies using Brown algae from Jeju have been conducted. This study identified materials with high antioxidant levels and examined their whitening effects to assess their feasibility as potential cosmetic resources. Brown algae from Jeju (Undaria pinnatifida (Harvey) Suringar, Laminaria japonica, Ecklonia cava, Hizikia fusiforme (Harvey) Okamura (HF), and Sargassum fulvellum (Turner) C. Agardh (SF) were processed using a supercritical fluid system at 50℃ and 400 bar, and their total phenol content, antioxidant activity, tyrosinase inhibition, and primary skin irritation were measured. Of all the samples, only SF using the supercritical fluid system (SFS) displayed concentration-dependent behavior for the total phenol content (p<0.05). Among the samples, the antioxidant activity of SFS was significantly higher (p<0.05) and the one increased at higher concentrations (p<0.05). On the other hand, tyrosinase was inhibited to a greater extent with HF than the others. The primary skin irritation tests showed that none of the samples were skin irritants. This study confirmed the feasibility of using Phaeophyceae from Jeju as potential cosmetic materials, where the samples can be selected and utilized based on the required physicochemical properties.

• Korean Journal of Organic Agriculture
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• v.32 no.3
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• pp.277-288
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• 2024

The present study was conducted to investigate the effects of seaweeds on in vitro ruminal fermentation characteristics and methane gas production. Five seaweeds (Dictyota dichotoma, DD; Chrysymenia wrightii Yamada, CW; Codium fragile, CF; Sargassum fusiforme, SF; Gracilaria vermiculophylla, GV) were obtained from National Institute of Fisheries Science (NIFS) in South Korea. The ruminal fluids were collected from 3 rumen-cannulated Hanwoo steers (average 12-months-old). The buffered ruminal fluids (50 mL) were incubated with substrates (0.4 g of concentrate and 0.1 g of rice straw in dry matter basis) and seaweeds (5% of substrates) at 39℃ for 24 and 48 hours. The total gas and methane production of all treatments incubated for 24 hours were not affected by the seaweed. However, methane production (mL/g of digested dry matter) in the CW and CF treatments incubated for 48 hours was decreased compared to control (p<0.05). Additionally, the ruminal pH of all treatments incubated for 24 and 48 hours was lower than control (p<0.05). There was no signigicant difference in total VFA concentration at 24 hours of incubation, but it was higher in the CF treatment at 48 hours of incubation (p<0.05). The dry matter digestibility of all treatments incubated for 24 and 48 hours were not affected by the seaweed. In conclusion, Codium fragile reduced in vitro methane production without negative effects on rumen fermentation characteristics.