Arabinan-Type Polysaccharides from Industrial Apple Pomace Waste.

Chemical investigation of industrial apple pomace waste has led to the isolation of two water-soluble polysaccharides (AS-3 and AS-5). Both polysaccharides were identified as arabinans on the basis of GC-MS, IR, 1D, 2D NMR, and MALDI-TOF-MS studies. GC-MS analysis of alditol acetate derivatives of AS-3 suggested the presence of arabinose and glucose sugars in the ratio of 4:1, whereas AS-5 was composed of only arabinose. The structure of AS-3 was identified as circular with three arabinose and one glucose in the circle and one arabinose unit branched at the C-4 position of the arabinose. AS-5 consists of four arabinose units, out of which three were linked linearly through 1 → 5 and 1 → 3 linkage and one in the side chain linked through 1 → 2 linkage. [ABSTRACT FROM AUTHOR]