title: Phenolic acids in black raspberry and in the gastrointestinal tract of pigs following ingestion of black raspberry.
abstract: Black raspberries (BRB) contain high levels of polyphenols and have been demonstrated to be chemopreventive. In order to investigate the underlying mechanism and study the metabolism of anthocyanins, pigs were fed freeze-dried BRB powder or purified diet (control) and three segments of the gastrointestinal (GI) tract (small intestine, cecum, and colon; 4 h after feeding) were collected for analysis of phenolic acids. Protocatechuic acid was the major phenolic acid (8.35 mg/100 g, dry weight (DW)) in BRB, followed by p-coumaric acid (1.63 mg/100 g, DW), caffeic acid (1.34 mg/100 g, DW), ferulic acid (0.24 mg/100 g, DW), and 3-hydroxybenzoic acid (0.20 mg/100 g, DW). Recoveries of these five phenolic acids in the whole GI tract were 199.9 +/- 54.0%, 7.0 +/- 3.0%, 37.0 +/- 9.7%, 56.6 +/- 31.3%, and 916.8 +/- 642.3% (mean +/- SEM, n = 5), respectively, and quantities in contents of the GI tract ranged from 0.13 +/- 0.05 micromol (p-coumaric acid) to 23.47 +/- 6.09 micromol (protocatechuic acid) (mean +/- SEM, n = 5). Six other phenolic acids were detected primarily in the cecum and/or colon which were not in BRB, with total contents in the GI tract ranging from 0.18 +/- 0.18 micromol (homovanillic acid) to 8.49 +/- 4.31 micromol (homoprotocatechuic acid). Total phenolic acids in the GI tract were 49.32 +/- 16.37 micromol (mean +/- SEM, n = 5). Phenolic acids measured in the GI tract accounted for only 6.31% of the degraded anthocyanins.
authors.affiliation: USDA Arkansas Children's Nutrition Center, University of Arkansas for Medical Sciences, AR, USA.
authors.forename: Xianli
authors.initials: X
authors.lastname: Wu
authors.forename: Hoy E
authors.initials: HE
authors.lastname: Pittman Iii
authors.forename: Tiffany
authors.initials: T
authors.lastname: Hager
authors.forename: Aaron
authors.initials: A
authors.lastname: Hager
authors.forename: Luke
authors.initials: L
authors.lastname: Howard
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Prior
mesh_terms: D000818:Animals; D002109:Caffeic Acids / Q000032:analysis; D002264:Carboxylic Acids / Q000008:administration & dosage / Q000032:analysis* / Q000493:pharmacokinetics; D003373:Coumaric Acids / Q000032:analysis; D004032:Diet; D005638:Fruit / Q000737:chemistry*; D041981:Gastrointestinal Tract / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000032:analysis; D011422:Propionates; D027824:Rosaceae / Q000737:chemistry*; D013552:Swine
chemical_list: D002109:Caffeic Acids; D002264:Carboxylic Acids; D003373:Coumaric Acids; D062385:Hydroxybenzoates; D011422:Propionates; C032948:3-hydroxybenzoic acid; C009091:protocatechuic acid; C004999:ferulic acid; C495469:p-coumaric acid; C040048:caffeic acid