Studies on apple and blueberry fruit constituents: do the polyphenols reach the colon after ingestion?
The aim of our studies was to determine the amount of polyphenols reaching the colon after oral intake of apple juice and blueberries. After a polyphenol-free diet healthy ileostomy volunteers consumed a polyphenol-rich cloudy apple juice while others consumed anthocyanin-rich blueberries. Ileostomy effluent was collected and polyphenols were identified using HPLC-DAD as well as HPLC-ESI-MS/MS; quantification was performed with HPLC-DAD. Most of the orally administered apple polyphenols were absorbed from or metabolized in the small intestine. Between 0 and 33% of the oral dose was recovered in the ileostomy bags with a maximum of excretion after 2 h. A higher amount of the blueberry anthocyanins under study (up to 85%, depending on the sugar moiety) were determined in the ileostomy bags and therefore would reach the colon under physiological circumstances. Such structure-related availability has to be considered when polyphenols are used in model systems to study potential preventive effects in colorectal diseases.
Department of Food Chemistry, University of Wuerzburg, Am Hubland, Germany.
Kathrin
K
Kahle
Michael
M
Kraus
Wolfgang
W
Scheppach
Matthias
M
Ackermann
Friederike
F
Ridder
Elke
E
Richling
D000872:Anthocyanins / Q000008:administration & dosage / Q000032:analysis / Q000493:pharmacokinetics; D001682:Biological Availability; D029798:Blueberry Plants / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D003106:Colon / Q000378:metabolism*; D005419:Flavonoids / Q000008:administration & dosage / Q000032:analysis / Q000493:pharmacokinetics*; D005638:Fruit / Q000737:chemistry*; D006801:Humans; D007081:Ileostomy; D027845:Malus / Q000737:chemistry*; D010636:Phenols / Q000008:administration & dosage / Q000032:analysis / Q000493:pharmacokinetics*; D059808:Polyphenols; D021241:Spectrometry, Mass, Electrospray Ionization
D000872:Anthocyanins; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols