preparative isolation and purification of antioxidative stilbene oligomers from vitis chunganeniss...
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Preparative isolation and purification ofantioxidative stilbene oligomers from Vitis
chunganeniss using high-speed counter-currentchromatography in stepwise elution mode
2009 10.22 MinSeok Kang
Department of Chemistry, Zhejiang University, Hangzhou, ChinaCollege of Food Science and Biological Engineering, Zhejiang Gengshang University, Hangzhou, China
Shan He Yanbin Lu Liyan Jiang Bin Wu Feiying Zhang Yuanjiang Pan
Journal of separation science April 30 2009
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Introduction• HSCCC in Stepwise elution mode• Sample profile (Vitis chunganeniss)
Experiment procedure & result• HSCCC• DPPH & Electron paramagnetic resonance
Further study (Application)
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KD
=
C upper
C lower
K 0.5 ≤
≤ 1.0(2.0)
Proper range of K value
The distribution constant
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Journal of Chromatographic Science, Vol. 47, May/June 2009
Judging K value is not easy work.
Inevitable selection
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What is the stepwise elution mode?
Add up two systems
If you are suffer from finding proper solvent system at one step
These peaks are suitable for 5:5:6:4
These peaks are suitable for 1:1:1:1
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Sample profile
东南葡萄Vitaceae
Traditionally using for…1. Infectious hepatitis2. Physical injury
No phytochemical or pharmacological investigation has been reported.
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Sample Preparation
Dried powder of V. chunganeniss (2.5kg)
MeOH extractionCrude sample
(270g)-> Aqueous
solutionSolvent Fractionation with EA ( 5
times ]
Crude sample (120g)
Evaporated under reduced pressure at 40’C
HSCCC separation
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Preparation of two-phase solvent system
Methanol : water gradient [ MeOH 0-40min / 30-70% ]
Add up
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HSCCC Procedure
1. Entirely filled with the upper phase
2. lower(mobile) phase was pumped into the column
3. Flow rate : 5.0mL/min , revolution speed : 450rpm4. Injection after hydrodynamic equilibrium (800mg)
HSCCC type
TBE-1000A 5. Detection using UV (280nm)
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HSCCC result
Stepwise elution point All target was isolated
Compound 3 wasn’t isolated
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Structure Identification
Negative ESI-MS
1H-NMR
13C-NMR Hopeaphenol
Amurensin GVitisin A
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Activity
DPPH Assay 1. 180uL (O.15mM DPPH in EtOH) + Sample 20uL ->
96 well plate2. Incubated at 37’C for 30min 3. 517 nm absorbance
Electron param-agnetic reso-
nance
DPPH result
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electron paramagnetic resonance
a spinning electron behaves like a tiny magnet
absorption of electromagnetic radiation (in the form of microwaves)
Getting signal
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Activity Electron paramagnetic res-onance
Scavenging effect on reactive oxygen species(ROS)
Hydroxyl Radicals
OH·
ROS
Superoxide anions
O2−.
Singlet oxygen 1O2
DMPO-OH adduct
DMPO-OOH adduct
TEMP- 1O2
adduct
Fenton type reaction
Photo-irradiated riboflavin/EDTA
Rose bengal in combination with photo-irradiation
Species
Sourse
Detec-tion
Spin-Trap
DMPO TEMP
Modulation frequency : 100kHzMicrowave frequency : 9.86GHzMicrowave power : 20.11 mWTemperature : 298K
Modulation amplitude : 1GScan Width : 200GTime constant : 81.92 ms
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Activity of Vitisin AElectron paramagnetic res-onance
It was not effective scavenger of hydroxyl radical
It was not effective scavenger of Superoxide anion
IC50 of 1O2 = 6.9umol> EGCG(14.5 umol)
Reported Activity of Vitisin A : anti-obesity , anti-inflammatory , hepa-totoxic activity
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Further study
1. The more you think, the more you get
2. Application of our HSCCC procedure
Various solvent systems
Two or three combined systems
Stepwise elution & obtain target compounds
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Thank you for your attention