title: Bioappearance and pharmacokinetics of bioactives upon coffee consumption.
abstract: Habitual consumption of medium amounts of coffee over the whole life-span is hypothesized to reduce the risk to develop diabetes type 2 (DM2) and Alzheimer's disease (AD). To identify putative bioactive coffee-derived metabolites, first, pooled urine from coffee drinkers and non-coffee drinkers were screened by UPLC-HDMS. After statistical data analysis, trigonelline, dimethylxanthines and monomethylxanthines, and ferulic acid conjugates were identified as the major metabolites found after coffee consumption. For quantitative analysis of these markers in body fluids, targeted methods based on stable-isotope dilution and UPLC-MS/MS were developed and applied to plasma samples from a coffee intervention study (n = 13 volunteers) who consumed a single cup of caffeinated coffee brew after a 10-day washout period. Chlorogenic acid-derived metabolites were found to be separated into two groups showing different pharmacokinetic properties. The first group comprised, e.g., ferulic acid and feruloyl sulfate and showed early appearance in the plasma (~1 h). The second group contained particularly chlorogenic acid metabolites formed by the intestinal microflora, appearing late and persisting in the plasma (>6 h). Trigonelline appeared early but persisted with calculated half-life times ~5 h. The plasma levels of caffeine metabolites significantly and progressively increased 2-4 h after coffee consumption and did not reach c max within the time frame of the study. The pharmacokinetic profiles suggest that particularly trigonelline, caffeine, its metabolites, as well as late appearing dihydroferulic acid, feruloylglycine and dihydroferulic acid sulfate formed from chlorogenic acid by the intestinal microflora accumulate in the plasma due to their long half-life times during habitual consumption of several cups of coffee distributed over the day. Since some of these metabolites have been reported to show antioxidant effects in vivo, antioxidant-response-element activating potential, and neuroprotective properties, respectively, some of these key metabolites might account for the inflammation- and DM2/AD risk reducing effects reported for habitual life time consumption of coffee.
authors: Chair of Food Chemistry and Molecular Sensory Science, Technische Universität München, Lise-Meitner-Str 34, 85354, Freising, Germany.
authors: Roman
authors: R
authors: Lang
authors: Natalie
authors: N
authors: Dieminger
authors: Anja
authors: A
authors: Beusch
authors: Yu-Mi
authors: YM
authors: Lee
authors: Andreas
authors: A
authors: Dunkel
authors: Barbara
authors: B
authors: Suess
authors: Thomas
authors: T
authors: Skurk
authors: Anika
authors: A
authors: Wahl
authors: Hans
authors: H
authors: Hauner
authors: Thomas
authors: T
authors: Hofmann
mesh_terms: D000328:Adult; D000470:Alkaloids / Q000097:blood / Q000378:metabolism* / Q000652:urine; D002110:Caffeine / Q000097:blood / Q000378:metabolism* / Q000652:urine; D002726:Chlorogenic Acid / Q000097:blood / Q000378:metabolism* / Q000652:urine; D003069:Coffee / Q000378:metabolism*; D003373:Coumaric Acids / Q000097:blood / Q000378:metabolism* / Q000652:urine; D005260:Female; D006801:Humans; D008297:Male; D053719:Tandem Mass Spectrometry; D014970:Xanthines / Q000097:blood / Q000378:metabolism* / Q000652:urine; D055815:Young Adult
chemical_list: D000470:Alkaloids; D003069:Coffee; D003373:Coumaric Acids; D014970:Xanthines; D002726:Chlorogenic Acid; D002110:Caffeine; C009560:trigonelline; C004999:ferulic acid