Olive pomace, a source for valuable arabinan-rich pectic polysaccharides

Area of Science:

• Food Science
• Biochemistry
• Materials Science

Background:

• Olive pomace, a byproduct of olive oil extraction, is rich in cell wall polysaccharides.
• Pectic polysaccharides constitute a significant fraction of olive pomace, alongside cellulose and glucuronoxylans.
• These pectic polysaccharides possess unique structural features, particularly an arabinan moiety.

Purpose of the Study:

• To characterize the cell wall polysaccharides from olive pomace.
• To investigate the gelling properties of olive pomace pectic polysaccharides with calcium.
• To evaluate the potential of these pectic polysaccharides for industrial applications.

Main Methods:

• Extraction and characterization of pectic polysaccharides from olive pomace.
• Analysis of polysaccharide composition and structural features, including the arabinan moiety.
• Assessment of gelation properties in the presence of calcium, including critical gelling concentrations, syneresis, and thermal stability.

Main Results:

• Olive pomace yielded pectic polysaccharides with a unique beta-(1-->5)-terminally-linked arabinose residue.
• These pectic polysaccharides formed elastic gels with calcium, exhibiting higher critical gelling concentrations than commercial pectins.
• The gels demonstrated enhanced resistance to temperature and a wider range of homogeneous gel formation compared to commercial low-methoxyl pectin gels.

Conclusions:

• Olive pomace is a valuable source of unique pectic polysaccharides.
• The distinct structural features and superior gelling properties make these polysaccharides suitable for specialized applications.
• The arabinan feature can serve as a marker for olive pulp and ripening stage evaluation.