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RISS 인기검색어
- 검색키워드
- 저자 : Riho Katagiri (검색결과 3 건)
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Antioxidant and anti-adipogenic activities of acorn shells
Un-Young Youn,손명수,김교남,Riho Katagiri,Kaori Harata,Masayuki Kamegai,Yasuyuki Ishida,이승철 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4
Antioxidant and anti-adipogenic activities of water extract (WE) and methanol extract (ME)of acorn shells (AS), from Quercus acutissima Carruth. grown in Korea, were investigated. At aconcentration of 50 μg/mL, the WE had a scavenging activity of 53.84% for the DPPH and 76.09% forthe ABTS radical, while the ME had corresponding scavenging activities of 29.09 and 48.43%. Totalphenolic contents of WE and ME were 375.96 and 288.01 mg gallic acid equivalents/g of extracts,respectively. Both extracts significantly inhibited 3T3-L1 adipogenesis in a dose-dependent manner,and concomitantly decreased the size and number of intracellular lipid droplets. Furthermore, the antiadipogenicactivities of WE and ME are largely limited in the pre- and early stages of adipogenesis. Theresults suggest that AS may be a promising source of antioxidants and anti-obesity compounds.
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Antioxidant effects of citrus pomace extracts processed by super-heated steam
Wang, Lei,Jo, Min-Ji,Katagiri, Riho,Harata, Kaori,Ohta, Moemi,Ogawa, Ayane,Kamegai, Masayuki,Ishida, Yasuyuki,Tanoue, Shota,Kimura, Sojiro,Lee, Seung-Cheol,Jeon, You-Jin Elsevier 2018 FOOD SCIENCE AND TECHNOLOGY -ZURICH- Vol.90 No.-
<P>This study was performed to investigate the enhanced antioxidant effects of citrus pomace (CP) extracts processed by super-heated steam (SHS). CP extracts were obtained using a closed SHS system at three different temperatures (100, 200, and 300 degrees C) with an extraction time of 10 or 20 min. These extracts were evaluated for their antioxidant activities by measuring their DPPH, alkyl, and hydroxyl radical scavenging activity using Electron Spin Resonance (ESR) spectroscopy and for their protective effects against H2O2-induced oxidative stress in Vero cells. All extracts exhibited strong radical scavenging activities and protective effects against H2O2-induced Vero cell damage. Especially, the SHS-CP extracts obtained at 300 degrees C with extraction times of both 10 min and 20 min exhibited antioxidant activities that were significantly higher than those of ethanol extracts and SHS-CP extracts obtained at other temperatures. The total phenolic and flavonoid contents of SHS-CP extracts and their antioxidant activities were found to be increased with elevated processing temperatures. Moreover, gas chromatography/mass spectrometry (GC/MS) in the presence of a methylating reagent revealed that some characteristic polyphenols and polyhydroxycyclohexanes were present in the SHS-CP extracts. Thus, this study demonstrated that SHS extraction is an efficient and environmentally friendly method for extracting antioxidants from CP.</P>
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Antioxidant and anti-adipogenic activities of acorn shells
Youn, Un-Young,Shon, Myung-Soo,Kim, Gyo-Nam,Katagiri, Riho,Harata, Kaori,Kamegai, Masayuki,Ishida, Yasuyuki,Lee, Seung-Cheol 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4
Antioxidant and anti-adipogenic activities of water extract (WE) and methanol extract (ME) of acorn shells (AS), from Quercus acutissima Carruth. grown in Korea, were investigated. At a concentration of $50{\mu}g/mL$, the WE had a scavenging activity of 53.84% for the DPPH and 76.09% for the ABTS radical, while the ME had corresponding scavenging activities of 29.09 and 48.43%. Total phenolic contents of WE and ME were 375.96 and 288.01 mg gallic acid equivalents/g of extracts, respectively. Both extracts significantly inhibited 3T3-L1 adipogenesis in a dose-dependent manner, and concomitantly decreased the size and number of intracellular lipid droplets. Furthermore, the antiadipogenic activities of WE and ME are largely limited in the pre- and early stages of adipogenesis. The results suggest that AS may be a promising source of antioxidants and anti-obesity compounds.
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