title: Carbon-14 biolabeling of (+)-catechin and proanthocyanidin oligomers in willow tree cuttings.
abstract: Proanthocyanidin polymers, oligomers, and the structurally related monomer (+)-catechin were labeled by incorporation of radioactive precursors in shoots of willow tree (Salix caprea L.). [1-(14)C]-Acetate and [U-(14)C]-phenylalanine precursors were fed through the cut stems or petioles of leaves. Optimization of several parameters such as the nature and origin of the plant material, leaf maturity, nature, and quantity of radioactive precursor applied and the duration of metabolism led to incorporation yields of 3.2% and to specific activities of 500 microCi/g. Detailed characterization of the products (polymerization degree, procyanidin/prodelphinidin ratio, specific activities) and purification by chromatography are reported. Some sugars bound to radiolabeled proanthocyanidin polymers were removed by enzymic treatment with a mixture of glycosidases. A radioactive purity close to 100% and specific activities suitable for bioavailability studies were obtained.
authors.affiliation: Laboratoire de Chimie Biologique (INRA), Centre de Biotechnologie Agro-Industrielle, Institut National Agronomique Paris-Grignon, 78850 Thiverval-Grignon, France.
authors.forename: S
authors.initials: S
authors.lastname: Déprez
authors.forename: I
authors.initials: I
authors.lastname: Mila
authors.forename: A
authors.initials: A
authors.lastname: Scalbert
mesh_terms: D000872:Anthocyanins / Q000302:isolation & purification* / Q000493:pharmacokinetics; D000975:Antioxidants / Q000302:isolation & purification* / Q000493:pharmacokinetics; D001682:Biological Availability; D002250:Carbon Radioisotopes; D002392:Catechin / Q000302:isolation & purification* / Q000493:pharmacokinetics; D005419:Flavonoids; D007553:Isotope Labeling / Q000379:methods; D010636:Phenols / Q000302:isolation & purification* / Q000493:pharmacokinetics; D011108:Polymers / Q000302:isolation & purification* / Q000493:pharmacokinetics; D044945:Proanthocyanidins; D012680:Sensitivity and Specificity; D014197:Trees / Q000378:metabolism*
chemical_list: D000872:Anthocyanins; D000975:Antioxidants; D002250:Carbon Radioisotopes; D005419:Flavonoids; D010636:Phenols; D011108:Polymers; D044945:Proanthocyanidins; C013221:proanthocyanidin; D002392:Catechin