A comparative study of mucilage and pulp polysaccharides from tamarillo fruit (Solanum betaceum Cav.)

作者：do Nascimento Georgia Erdmann; Iacomini Marcello; Cordeiro Lucimara M C^*

来源：Plant Physiology and Biochemistry, 2016, 104: 278-283.

DOI：10.1016/j.plaphy.2016.04.055

• Arabinan
• Arabinogalactan
• Mucilage
• Pectins
• Solanum betaceum
• Tamarillo
• Xylan

A comparative study of mucilage (locular tissue) and pulp polysaccharides from ripe tamarillo fruits (Solanum betaceum Cay.) was carried out. After aqueous and alkaline extractions and various purification steps (freeze thaw and alpha-amylase - EC 3.2.1.1 treatments, Fehling precipitation and ultrafiltration through 50 kDa cut-off membrane), the obtained fractions from mucilage were analyzed by sugar composition, HPSEC, and NMR spectroscopy analyses. The results showed that the mucilage of tamarillo contains a highly methoxylated homogalacturonans mixed with type I arabinogalactans, a linear (1 -> 5)-linked alpha-L-arabinan, and a linear (1 -> 4)-beta-D-xylan. A comparison with polysaccharides extracted from the pulp revealed that differences were observed in the yield and in the ratio of extracted polysaccharides. Moreover, structural differences between pulp and mucilage polysaccharides were also observed, such as in the length of side chains of the pectins, and in the degree of branching of the xylans.

• 出版日期2016-7