1
|
Joo SJ, Park HJ, Park JH, Cho JG, Kang JH, Jeong TS, Kang HC, Lee DY, Kim HS, Byun SY, Baek NI. Flavonoids from Machilus japonica stems and their inhibitory effects on LDL oxidation. Int J Mol Sci 2014; 15:16418-29. [PMID: 25229822 PMCID: PMC4200834 DOI: 10.3390/ijms150916418] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 08/16/2014] [Accepted: 08/27/2014] [Indexed: 11/16/2022] Open
Abstract
Stems of Machilus japonica were extracted with 80% aqueous methanol (MeOH) and the concentrated extract was successively extracted with ethyl acetate (EtOAc), normal butanol (n-BuOH), and water. Six flavonoids were isolated from the EtOAc fraction: (+)-taxifolin, afzelin, (−)-epicatechin, 5,3'-di-O-methyl-(−)-epicatechin, 5,7,3'-tri-O-methyl-(−)-epicatechin, and 5,7-di-O-methyl-3',4'-methylenedioxyflavan-3-ol. The chemical structures were identified using spectroscopic data including NMR, mass spectrometry and infrared spectroscopy. This is the first report of isolation of these six compounds from M. japonica. The compounds were evaluated for their diphenyl picryl hydrazinyl scavenging activity and inhibitory effects on low-density lipoprotein oxidation. Compounds 1 and 3–6 exhibited DPPH antioxidant activity equivalent with that of ascorbic acid, with half maximal inhibitory concentration (IC50) values of 0.16, 0.21, 0.17, 0.15 and 0.07 mM, respectively. The activity of compound 1 was similar to the positive control butylated hydroxytoluene, which had an IC50 value of 1.9 µM, while compounds 3 and 5 showed little activity. Compounds 1, 3, and 5 exhibited LDL antioxidant activity with IC50 values of 2.8, 7.1, and 4.6 µM, respectively.
Collapse
Affiliation(s)
- Se-Jin Joo
- Center, Seoul Cosmetics Co., Ltd., Incheon 443-749, Korea.
| | - Hee-Jung Park
- Laboratory of Natural Products Chemistry, Graduate School of Oriental Medicinal Materials Biotechnology, Kyung Hee University, Yongin 446-701, Korea.
| | - Ji-Hae Park
- Laboratory of Natural Products Chemistry, Graduate School of Oriental Medicinal Materials Biotechnology, Kyung Hee University, Yongin 446-701, Korea.
| | - Jin-Gyeong Cho
- Laboratory of Natural Products Chemistry, Graduate School of Oriental Medicinal Materials Biotechnology, Kyung Hee University, Yongin 446-701, Korea.
| | - Ji-Hyun Kang
- National Research Laboratory of Lipid Metabolism & Atherosclerosis, KRIBB, Daejeon 305-806, Korea.
| | - Tae-Sook Jeong
- National Research Laboratory of Lipid Metabolism & Atherosclerosis, KRIBB, Daejeon 305-806, Korea.
| | - Hee Cheol Kang
- Research & Development Center, GFC Co., Ltd., Suwon 443-813, Korea.
| | - Dae-Young Lee
- Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA, Eumseong 369-873, Korea.
| | - Hack-Soo Kim
- Center, Seoul Cosmetics Co., Ltd., Incheon 443-749, Korea.
| | - Sang-Yo Byun
- Cosmetic Business R&D Service Center, Graduate School, Ajou University, Suwon 443-749, Korea.
| | - Nam-In Baek
- Laboratory of Natural Products Chemistry, Graduate School of Oriental Medicinal Materials Biotechnology, Kyung Hee University, Yongin 446-701, Korea.
| |
Collapse
|
3
|
Shrestha S, Park JH, Lee DY, Cho JG, Yoo JS, Yeon SW, Kang HC, Baek NI. Constituents of Machilus thunbergii bark and inhibition of cyclin-dependent kinases (CDKs) by procyanidin B2. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/bf03253192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|