In this work, galactomannans and xyloglucans were isolated from the seed
endosperm and cotyledon of Brazilian non-conventional sources, respectively.
Extraction yields, monosaccharide ratios, macromolecular parameters and molar
mass distributions were determined and compared to commercial guar gum and
Locust Bean Gum (LBG). The extraction yield in relation to seed mass ranged
from 7.0% to 40.63%, with xyloglucan yields being higher than galactomannan yields. Schizolobium parahyba and Caesalpinia pulcherrima galactomannans
exhibited the lowest protein contents, 0.05% and 0.08%, respectively. Flow
curves of 1% hemicellulose solutions (w:v) were measured by varying the shear
rate from 0.1 to 100 s﹣1. The resulting data were fitted to a Power
Law model, and all the hemicelluloses presented shear-thinning behavior.
Galactomannans and xyloglucans with different monosaccharide ratios showed
similar consistency indices. Rheological properties were also compared, and the
results suggest new hemicellulose sources, which can be studied for additional
applications in areas such as materials science, medicine and biology.
Cite this paper
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