Normal view MARC view ISBD view

Sur la formation d'un complexe depside-cafeine lors de la conservation, au froid, en milieu hydro-©♭thanolique d'echantillons foliaires de cafeiers. Implications methodologiques pour l'extraction des depsides

by Colonna, J.P.
Publisher: Jul 1977Subject(s): BIOQUIMICA | HOJAS | EXTRACCION | CAFEINA | ANALISIS DE TEJIDOS | ANALISIS QUIMICO | ACIDO CLOROGENICO | BIOCHEMISTRY | LEAVES | EXTRACTION | CAFFEINE | TISSUE ANALYSIS | CHLOROGENIC ACID | BIOCHIMIE | FEUILLE | EXTRACTION | CAFEINE | ANALYSE DE TISSUS | ACIDE CHLOROGENIQUE In: Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences. Serie D: Sciences Naturelles (Francia) v. 285(3) p. 253-256Summary: The depsides present in coffee leaves are not apparent upon extraction with ethanol if the plant material has been fixed in boiling ethanol then maintained at - 25ðC. A complex formed with cafein prevents the extraction and this artefact from cold conservation concerns chlorogenic acid and its isomers. A treatment with chloroform can break the complex and allows the depsides to be dosed. The complex does not seem to exist in living issues
    average rating: 0.0 (0 votes)
No physical items for this record

++ 14 ref. Sum. (En, Fr)

The depsides present in coffee leaves are not apparent upon extraction with ethanol if the plant material has been fixed in boiling ethanol then maintained at - 25ðC. A complex formed with cafein prevents the extraction and this artefact from cold conservation concerns chlorogenic acid and its isomers. A treatment with chloroform can break the complex and allows the depsides to be dosed. The complex does not seem to exist in living issues

Click on an image to view it in the image viewer