TITLE:
Physicochemical Properties of Edible Seed Hemicelluloses
AUTHORS:
Felipe Domingos de Sousa, Marjory Lima Holanda-Araújo, José Roberto Rodrigues de Souza, Rafael de Souza Miranda, Rafael Raimundo Almeida, Eneas Gomes-Filho, Nágila Maria Pontes-Ricardo, Ana Cristina Oliveira Monteiro-Moreira, Renato de Azevedo Moreira
KEYWORDS:
Galactomannan, Xyloglucan, Intrinsic Viscosity, Rheology
JOURNAL NAME:
Open Access Library Journal,
Vol.4 No.6,
June
8,
2017
ABSTRACT: 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.