Studies of intestinal permeability of 36 flavonoids using Caco-2 cell monolayer model.

Abstract:

:To investigate the structure-permeability relationship of dietary/nutriceutic flavonoids, the transepithelial transport and cellular uptake of 36 flavonoids (including flavones, flavonols, dihydroflavones, dihydroflavonols, isoflavones, chalcones, flavanes, flavanols, methylated and glycosidic derivatives) were investigated using the Caco-2 cell monolayer. The apparent permeability coefficients (P(app)) of the flavonoids were calculated from bilateral transport assays in the Transwell system with flavonoid determination using a high performance liquid chromatography (HPLC) coupled with a UV detector. The most flavonoids exhibited concentration-independent P(app) values and a ratio of 0.5-1.8 for P(app AB to BL)/P(app BL to AB), suggesting passive diffusion pathways. However, certain flavonoids e.g. morin and some flavonoid glycosides may involve the efflux mechanisms. For isoflavones, flavones, and dihydroflavones, the oil/water partition coefficients (additionally modified by the number and position of the three hydroxyl groups) was the key determinant for Caco-2 cell permeation. However, the permeability of flavonols is more complex with their structure possibly related to their high rate of cell accumulation. Overall, the parental skeleton structure, the number and position of free hydroxyl groups, accumulation and efflux in Caco-2 cell play the key roles in the transport of flavonoids across Caco-2 cell monolayer.

journal_name

Int J Pharm

authors

Tian XJ,Yang XW,Yang X,Wang K

doi

10.1016/j.ijpharm.2008.09.023

subject

Has Abstract

pub_date

2009-02-09 00:00:00

pages

58-64

issue

1-2

eissn

0378-5173

issn

1873-3476

pii

S0378-5173(08)00655-8

journal_volume

367

pub_type

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