Arabinan-rich pectic polysaccharides from buriti (Mauritia flexuosa): An Amazonian edible palm fruit

•Two pectic polysaccharides were purified from pulp of buriti fruits.•A branched arabinan linked to rhamnogalacturonan-I was characterized.•A high methyl esterified homogalacturonan was also present.•The hypothesis that pectin is the main non-cellulosic polymer in palms was supported. Primary cell w...

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Bibliographic Details
Published in:Carbohydrate polymers 2015-05, Vol.122, p.276-281
Main Authors: Cantu-Jungles, Thaisa Moro, Almeida, Carolina Pierobom de, Iacomini, Marcello, Cipriani, Thales R., Cordeiro, Lucimara M.C.
Format: Article
Language:English
Subjects:
Arabinan
Arecaceae - chemistry
Buriti fruits
Cell Wall - chemistry
Fruit - chemistry
Homogalacturonan
Magnetic Resonance Spectroscopy
Mauritia Flexuosa
Molecular Structure
Monosaccharides - analysis
Pectic polysaccharides
Pectins - chemistry
Plant Extracts - chemistry
Polysaccharides - chemistry
Type I rhamnogalacturonan
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Summary:•Two pectic polysaccharides were purified from pulp of buriti fruits.•A branched arabinan linked to rhamnogalacturonan-I was characterized.•A high methyl esterified homogalacturonan was also present.•The hypothesis that pectin is the main non-cellulosic polymer in palms was supported. Primary cell wall polysaccharides from aqueous extract of buriti fruit pulp (Mauritia flexuosa, an exotic tropical palm) were isolated and characterized. After freeze–thaw and α-amylase treatments, extracted polysaccharides were purified by sequential ultrafiltration through membranes. Two homogeneous fractions were obtained, SBW-100R and SBW-30R (Mw of 126kDa and 20kDa, respectively). Monosaccharide composition, methylation and 13C NMR analysis showed that fraction SBW-100R contained a (1→5)-linked arabinan, branched at O-3 and O-2 positions, linked to a type I rhamnogalacturonan. Low amounts of these polymers were also present in fraction SBW-30R according to 13C NMR analysis and monosaccharide composition. However, a high methyl esterified homogalacturonan (HG) was present in higher proportions. These results reinforce previous findings present in literature data which indicate that pectic polysaccharides are found in high amounts in primary cell walls of palms, which are commelinid monocotyledons.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.12.085