title: Structural aspects of the exudate from the fruit of Chorisia speciosa St. Hil.
abstract: Mature fruit of Chorisia speciosa yield an exudate (E-I) following mechanical injury. The polysaccharide contains rhamnose, arabinose, xylose, mannose, glucose, galactose and glucuronic acid in molar ratios of 20:11:1:3:2:40:23. The main chain of the structure is composed by beta-galactopyranosyl units linked (1 --> 3) and (1 --> 6) as indicated by NMR spectra and methylation data. Arabinosef and rhamnose are terminal residues. In order to compare E-I with the polysaccharides from the fruit mesocarp, the latter was submitted to different extractions. The water fraction contains rhamnose, arabinose, xylose, mannose, glucose, galactose and uronic acid in molar ratios of 18:4:1:2:3:44:28. It was treated with CTAB yielding a precipitate which was decomplexed with NaCl, giving four fractions. The fraction obtained using 0.15 M NaCl had a quantitative composition similar that of E-I.
authors.affiliation: Department of Biochemistry, UFPR, Curitiba, PR, Brazil.
authors.forename: E B
authors.initials: EB
authors.lastname: Beleski-Carneiro
authors.forename: J L
authors.initials: JL
authors.lastname: Ganter
authors.forename: F
authors.initials: F
authors.lastname: Reicher
mesh_terms: D001089:Arabinose / Q000032:analysis; D002458:Cell Fractionation; D002845:Chromatography; D005638:Fruit / Q000737:chemistry* / Q000166:cytology / Q000378:metabolism; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D010936:Plant Extracts / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D014197:Trees
chemical_list: D010936:Plant Extracts; D011134:Polysaccharides; D001089:Arabinose