No abstract

3+-EDTA/ H2O2 계에서 생성된 활성산소종에 대한 세 분획의 소거활성(총항산화능)은 대표적인 항산화제인 L-ascorbic acid와 비슷한 것으로 나타났다. Rose-bengal로 증감된 Abstract: In this study, the antioxidative effects and inhibitory activities on tyrosinase of Lindera obtusiloba Blume (L. obtusiloba Blume) extracts were investigated. 50 % ethanol extract, ethyl acetate and aglycone fractions of L. obtusiloba Blume were used in experiments. The DPPH (1,1-diphenyl-2-picrylhydrazyl) scavenging activities of ethyl acetate fraction of L. obtusiloba Blume was higher than (+)-α-tocopherol, known as a typical antioxidant. Reactive oxygen species (ROS) scavenging activities of extract and fractions of L. obtusiloba Blume on ROS generated in Fe 3+ -EDTA/H2O2 system were similar to L-ascorbic acid, well known as a strong antioxidant. The cellular protective effects of 50 % ethanol extract and ethyl acetate of L. obtusiloba Blume on the rose-bengal sensitized photohemolysis of human erythrocytes were increased in a concentration dependent manner (1 ~ 25 µg/mL). Ethyl acetate fraction in 10 µg/mL concentration showed the most protective effect among extracts (τ50 = 361.0 min). The inhibitory effects on tyrosinase of ethyl acetate and aglycone fractions were higher than arbutin, known as a whitening agent. These results indicate that L. obtusiloba Blume extracts can be used as antioxidant, and could be applicable to functional cosmetic ingredient.

In this work, comparative study on antioxidative activities of extracts from Glycyrrhiza uralensis (G. uralensis) produced in Korea and in China and Glycyrrhiza glabra (G. glabra) produced in Uzbekistan was conducted. Among three origins, 50% ethanol extracts (21.15 µg/mL), ethyl acetate fraction (29.15 µg/mL) and aglycone fraction (3.26 µg/mL) of G. uralensis from Korea showed the higher free radical (1,1-phenyl-2-picrylhydrazyl, DPPH) scavenging activity (FSC50) than extracts from other origins. Reactive oxygen species (ROS) scavenging activities (OSC50) of extracts from three origins on ROS generated in Fe 3+-EDTA/H2O2 system were investigated using luminol-dependent chemiluminescence assay 50% ethanol extract (1.00 µg/mL) and ethyl acetate fraction (0.34 µg/mL) of G. uralensis from China showed the most prominent ROS scavenging activity. The protective effects of extract/fractions of G. uralensis and G. glabra extracts on the rose-bengal sensitized photohemolysis of human erythrocytes were investigated. 50% ethanol extract and aglycone fraction of G. uralensis and G. glabra extracts from three origins showed cellular protective effects in a concentration dependent manner (5 ∼ 50 µg/mL). Aglycone fraction of G. uralensis from Korea (τ50 = 847.4 1) † 주 저자

In this study, Polygomun aviculare L. (P. aviculare L.) extract loaded elastic liposomes (ELPs) were investigated to enhance the transdermal delivery of P. aviculare L. extract composed of various flavonoids. ELPs were composed of egg phospholipids (PC) and edge activator (Tego ® care 450) and the physical properties and in vitro permeation studies of ELPs were performed. Particle size ranged from 148.1 to 262.2 nm and deformability index was recorded as 11.5~25.4. Loading efficiency was from 53.1 to 66.3%. In vitro skin permeation studies using Franz diffusion cell demonstrated that ELP-4 having ratio of 85:15 for PC to Tego ® care 450 exhibited the higher skin permeability than ELP-1, the general liposome without Tego ® care 450. It was visually seen by fluorescence image restoration microscopy. The findings suggest that ELP-4 selected as the optimal formulation could be used as useful formulation for transdermal delivery of the extract.

In this study, the cellular protective effect of isoquercitrin against H2O2 and rose bengal-indued HaCaT cell damage was investigated. The ethosome and elastic liposome for enhanced transdermal delivery were prepared. Particle size, loading efficiency and cumulative permeated amounts of them were evaluated. Isoquercitrin didn't show any characteristic cytotoxicity at 50 µM. When HaCaT cells were treated with 5 mM H2O2 and 25 µM rose bengal, isoquercitrin protected the cells against the oxidative damage in a concentration dependent manner (6.25 ~ 50 µM). The size of 0.03 % isoquercitrin loaded ethosome was 222.85 nm and the loading efficiency was 82.26 %. The ethosome loaded with 0.03 % isoquercitrin was stable and maintained the constant particle size for 2 weeks after being prepared. The ethosome exhibited more enhanced skin permeability than general liposome and ethanol solution. The optimal ratio of lipid to surfactant of 0.1 % isoquercitrin loaded elastic liposomes was observed to be 89 : 5 through evaluating particle size (341.2 nm), deformability index (59.89), loading efficiency (54.3 %), and skin permeability (54.4 %).