Polysaccharides composition in Arabica and Robusta green coffee beans: similar but different?

Quantitative determination of the polysaccharide content of Arabica Caturra (Coffea arabica var. Caturra) and Robusta 126 (Coffea canephora var. Robusta 126) green coffee beans demonstrated that they contained identical amounts of polysaccharide. Cell wall material (CWM) was prepared from the beans and partial solubilization of component polysaccharides was effected by sequential extraction. In Robusta more arabinogalactan was solubilized during preparation of the CWM and the water-soluble fraction of the CWM contained higher amounts of galactomannan than in Arabica. Linkage analysis indicated that the galactomannans possessed unbranched to branched mannose ratios between 14:1 and 30:1. No major differences in the structural features of the galactomannans between species was found. Compared to Arabica, Robusta appeared to contain greater amounts of arabinogalactans with more and longer side chains.

Bibliographic Details

Main Authors:	67767 Fischer, M., 109609 Redgwell, R.J., 109790 Reimann, S., 125628 Trovato, V., 60531 Curti, D., 3180 Association Scientifique Internationale du Cafe, París (Francia), 32308 19. International Scientific Colloquium on Coffee Trieste (Italia) 14-18 May 2001
Format:	biblioteca
Published:	Trieste (Italia) ASIC 2001
Subjects:	COFFEA, COFFEA ARABICA, COFFEA CANEPHORA, CAFE, PARED CELULAR, ALIMENTOS, COMPOSICION APROXIMADA, MANANOS, POLISACARIDOS,
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