Extraction, purification and structural characterization of a galactoglucomannan from the gabiroba fruit (Campomanesia xanthocarpa Berg), Myrtaceae family.
Carbohydr Polym
; 174: 887-895, 2017 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-28821144
In this study, we isolated and structurally characterized, for the first time, a galactoglucomannan (GGM) from the pulp of gabiroba, a Myrtaceae family species. The HPSEC-MALLS-RI analysis showed a homogeneous polysaccharide with molar mass of 25,340gmol-1. The monosaccharide composition showed that the GGM consisted of Man:Glc:Gal in a molar ratio of 1:1:0.6. Methylation and 1D and 2D NMR analyses suggested that the main chain of the GGM consisted of ß-d-Glcp and ß-d-Manp units (1â4)-linked. The α-d-Galp substitutions occur mainly at O-6 position of ß-d-Manp units. The glycosidic linkages of the GGM were evident by the presence of the characteristic signals of 4-O-substituted residues at δ 78.6/3.69 for both ß-d-Glcp and ß-d-Manp. Furthermore, the O-6 substitutions for both ß-d-Glcp and ß-d-Manp units were confirmed by signals at δ 67.1/4.00 and 3.93. The interglycosidic correlations, obtained through the analysis of the HMBC spectrum, further confirm the structure.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Myrtaceae
/
Frutas
/
Mananas
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido