4.7 Article

Extraction and characterization of cell wall polysaccharides from cranberry (Vaccinium macrocarpon var. Stevens) pomace

Journal

CARBOHYDRATE POLYMERS
Volume 267, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118212

Keywords

Cranberry pomace; Sequential extraction; Cell wall polysaccharides; Pectic polysaccharides

Funding

  1. Natural Sciences and Engineering Research Council (NSERC) of Canada
  2. Canada Foundation for Innovation [36708]

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In this study, cell wall polysaccharides were extracted from Stevens cranberry pomace, revealing a high content of pectic polysaccharides including homogalacturonan, arabinan, and galactan. Various extracts showed differences in composition, with CH extract having the highest yield and mainly consisting of homogalacturonan. Additionally, high molecular weight polysaccharides were identified in all extracts.
Cranberries of Stevens variety, mainly used for juice production, were processed into pomace, from which alcohol insoluble solids (AIS) were obtained. The cell wall polysaccharides were sequentially extracted from AIS, and characterized in terms of monosaccharide profile, sugar linkage and molecular weight distribution. Pectic polysaccharides represented more than 90% of the carbohydrates contained in hot buffer (HA), chelating agents (CH) and diluted alkali (DA) extracts. HA extract contained homogalacturonan with 75% being methyl esterified, and pectic arabinan with traces of pectic galactan, type II arabinogalactan and 1,4-beta-glucan. CH extract, recovered with the highest yield (11.0% w/w), was composed mainly of homogalacturonan. DA extract included homogalacturonan with 2% methyl esterification, abundant arabinan and galactans and traces of 1,4-beta-glucan. Glucomannan, xylan and xyloglucan represented 66% of the carbohydrates present in the last concentrated alkali extract (CA), the rest being pectic arabinan and galactan. High molecular weight polysaccharides (>10(2) kDa) were identified in all extracts.

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