Structural characterization of a glucuronoarabinoxylan from pineapple (Ananas comosus (L.) Merrill) gum exudate

► A glucuronoarabinoxylan was isolated from pineapple gum exudate. ► The main chain was composed of (1→4)-linked β-Xylp units. ► The side chains were composed of α-Araf, β-Arap, β-Xylp, β-Galp, and α-GlcpA units. ► Oligosaccharides were analyzed by ESI-MS as multi-charged or singly charged ions.