Abstract:
:This study investigated the extraction of polysaccharide from okra pulp (POP), its chemical components, and rheological properties. The results showed that the optimal extraction temperature, time, and the ration of water to material were 20-30 °C, 30 mins, and 150, respectively, giving a maximum yield of 29.4%. The POP extracted under the mild condition showed different properties. The molecular weight of POP varied from 6436 kDa to 7432 kDa. The GalA/Rha and Gal/Rha in POP suggests the domain of rhamnogalacturonan I with long galactose side chains. The POP presented pseudoplastic shear-thinning behavior, which can be described by the Ostward-DeWaele model. The apparent viscosity of POP decreased with temperature rising from 25 °C to 80 °C. In addition, sucrose, CaCl2, and NaCl led to the reduction of its apparent viscosity which was more sensitive to Ca2+ than to Na+ and sucrose. A closed hysteresis loop was obtained when the POP concentration reached to 6 g/L. The POP showed an elastic behavior (G' > G″) at concentration of 6 g/L, while it showed predominantly viscous response (G' < G″) at concentration of 2 and 4 g/L, over a wide range of frequencies (0.1-10 Hz). These results are potentially useful for the application of POP in food processing.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Li Y,Wang X,Lv X,Wang X,Wang X,Cui J,Yan Mdoi
10.1016/j.ijbiomac.2020.01.163subject
Has Abstractpub_date
2020-04-01 00:00:00pages
510-517eissn
0141-8130issn
1879-0003pii
S0141-8130(19)39058-0journal_volume
148pub_type
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