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Lee, Da Hye,Shin, Ji-Sun,Kang, Shin-Young,Lee, Seung-Bin,Lee, Jin Su,Ryu, Seung Mok,Lee, Kyung Tae,Lee, Dongho,Jang, Dae Sik American Chemical Society and American Society of 2018 Journal of natural products Vol.81 No.6
<P>An activity-guided fractionation procedure of the 70% aqueous EtOH extract from the roots of <I>Patrinia scabra</I> led to the isolation and characterization of five new iridoids, patriscabrins A-E (<B>1</B>-<B>5</B>), along with 13 known compounds. The structures of <B>1</B>-<B>5</B> were determined by interpretation of spectroscopic data, particularly by 1D and 2D NMR, ECD, and VCD studies. Thereafter, isolates were evaluated for their inhibitory effects on lipopolysaccharide-induced nitric oxide production in RAW 264.7 cells. Of these, the new iridoids <B>2</B> and <B>5</B> and the known lignan patrineolignan B (<B>6</B>) exhibited IC<SUB>50</SUB> values of 14.7 to 17.8 μM.</P> [FIG OMISSION]</BR>
Lee, Sang Yun,Kim, Si-Hoon,Nam, Yun Seok,Yu, Jae Choul,Lee, Seungjin,Kim, Da Bin,Jung, Eui Dae,Woo, Jeong-Hyun,Ahn, Seung-min,Lee, Sukbin,Choi, Kyoung-Jin,Kim, Ju-Young,Song, Myoung Hoon American Chemical Society 2019 NANO LETTERS Vol.19 No.2
<P>Organic-inorganic hybrid perovskites have been investigated extensively for use in perovskite-based solar cells and light-emitting diodes (LEDs) because of their excellent electrical and optical properties. Although the flexibility of perovskite LEDs has been studied through empirical methods such as cyclic bending tests, the flexibility of the perovskite layer has not been investigated systemically. Here, flexible and semitransparent perovskite LEDs are fabricated: a PEDOT:PSS anode and Ag nanowire cathode allow for flexible and semitransparent devices, while the use of a conjugated polyelectrolyte as an interfacial layer reduces the electron injection barrier between the cathode and the electron transport layer (SPW-111), resulting in enhanced device efficiency. Cyclic bending tests performed on the electrodes and in situ hole-nanoindentation tests performed on the constituent materials suggest that mechanical failure occurs in the perovskite MAPbBr<SUB>3</SUB> layer during cyclic bending, leading to a decrease in the luminance. Tensile properties of the MAPbBr<SUB>3</SUB> layer explain the critical bending radius (<I>r</I><SUB>b</SUB>) of the perovskite LEDs on the order of 1 mm.</P> [FIG OMISSION]</BR>
Antioxidant and Cytoprotective Effects of Lotus (Nelumbo nucifera) Leaves Phenolic Fraction
Lee, Da-Bin,Kim, Do-Hyung,Je, Jae-Young The Korean Society of Food Science and Nutrition 2015 Preventive Nutrition and Food Science Vol.20 No.1
Phenolic rich ethyl acetate fraction (EAF) from lotus leaves was prepared and its bioactive components, antioxidant and cytoprotective effects were investigated. EAF showed high total phenolic content and flavonoid content and contained rutin ($11,331.3{\pm}4.5mg/100g\;EAF$), catechin ($10,853.8{\pm}5.8mg/100g\;EAF$), sinapic acid ($1,961.3{\pm}5.6mg/100g\;EAF$), chlorogenic acid ($631.9{\pm}2.3mg/100g\;EAF$), syringic acid ($512.3{\pm}2.5mg/100g\;EAF$), and quercetin ($415.0{\pm}2.1mg/100g\;EAF$). EAF exerted the $IC_{50}$ of $4.46{\mu}g/mL$ and $5.35{\mu}g/mL$ toward DPPH and ABTS cation radicals, respectively, and showed strong reducing power, which was better than that of ascorbic acid, a positive control. Additionally, EAF protected hydroxyl radical-induced DNA damage indicated by the conversion of supercoiled pBR322 plasmid DNA to the open circular form and inhibited lipid peroxidation of polyunsaturated fatty acid in a linoleic acid emulsion. In cultured hepatocytes, EAF exerted a cytoprotective effect against oxidative stress by inhibiting intracellular reactive oxygen species formation and membrane lipid peroxidation. In addition, depletion of glutathione under oxidative stress was remarkably restored by treatment with EAF. The results suggest that EAF have great potential to be used against oxidative stress-induced health conditions.
Antioxidant and Cytoprotective Effects of Lotus (Nelumbo nucifera) Leaves Phenolic Fraction
Da-Bin Lee,Do-Hyung Kim,Jae-Young Je 한국식품영양과학회 2015 Preventive Nutrition and Food Science Vol.20 No.1
Phenolic rich ethyl acetate fraction (EAF) from lotus leaves was prepared and its bioactive components, antioxidant and cytoprotective effects were investigated. EAF showed high total phenolic content and flavonoid content and contained rutin (11,331.3±4.5 mg/100 g EAF), catechin (10,853.8±5.8 mg/100 g EAF), sinapic acid (1,961.3±5.6 mg/100 g EAF), chlorogenic acid (631.9±2.3 mg/100 g EAF), syringic acid (512.3±2.5 mg/100 g EAF), and quercetin (415.0±2.1 mg/100 g EAF). EAF exerted the IC50 of 4.46 μg/mL and 5.35 ?g/mL toward DPPH and ABTS cation radicals, respectively, and showed strong reducing power, which was better than that of ascorbic acid, a positive control. Additionally, EAF protected hydroxyl radical-induced DNA damage indicated by the conversion of supercoiled pBR322 plasmid DNA to the open circular form and inhibited lipid peroxidation of polyunsaturated fatty acid in a linoleic acid emulsion. In cultured hepatocytes, EAF exerted a cytoprotective effect against oxidative stress by inhibiting intracellular reactive oxygen species formation and membrane lipid peroxidation. In addition, depletion of glutathione under oxidative stress was remarkably restored by treatment with EAF. The results suggest that EAF have great potential to be used against oxidative stress-induced health conditions.