TY - JOUR
T1 - Influence of dehulling pretreatment on physicochemical properties of Gleditsia sinensis Lam. gum
AU - Jian, Hong lei
AU - Cristhian, Carrasco
AU - Zhang, Wei ming
AU - Jiang, Jian xin
N1 - Funding Information:
This work was supported by grants from the Natural Science Foundation of China (No. 30771685 ) and China Ministry of Education ( NCET-07-0082 and No. 111 ).
PY - 2011/7
Y1 - 2011/7
N2 - The seeds of Gleditsia sinensis Lam., widespread in China, are an important source of galactomannans. G. sinensis gum was extracted from whole seeds using baking, boiling water and acid dehulling pretreatment, respectively. The physicochemical properties of the three isolated G. sinensis gums were studied to evaluate three pretreatment methods. The results illustrated that the properties of G. sinensis gum were significantly influenced by dulling method (p < 0.05) including the yield, M/G ratio, viscosity, chemical composition and molecular weight. Power-law model (σ=k·γ̇n) was applied to the rheological measurements, which indicated that solutions of Gb, Gw and Ga gum behaved as pseudoplastic fluids at the concentration of 0.5% (w/v). The gum obtained by acid pretreatment (Ga) had the lowest yield of 20-24% (w/w). However Ga showed a pronounced shear-thinning behavior and particularly higher viscosity compared with the gums extracted by baking pretreatment (Gb) and boiling water dehulling method (Gw). The mannose to galactose ratios (M/G ratio) for Gb, Gw and Ga were found to be 4.5, 4.4 and 6.9, respectively. The highest molecular weight of 3.31 × 106 Da was observed for the galactomannans of Gb.
AB - The seeds of Gleditsia sinensis Lam., widespread in China, are an important source of galactomannans. G. sinensis gum was extracted from whole seeds using baking, boiling water and acid dehulling pretreatment, respectively. The physicochemical properties of the three isolated G. sinensis gums were studied to evaluate three pretreatment methods. The results illustrated that the properties of G. sinensis gum were significantly influenced by dulling method (p < 0.05) including the yield, M/G ratio, viscosity, chemical composition and molecular weight. Power-law model (σ=k·γ̇n) was applied to the rheological measurements, which indicated that solutions of Gb, Gw and Ga gum behaved as pseudoplastic fluids at the concentration of 0.5% (w/v). The gum obtained by acid pretreatment (Ga) had the lowest yield of 20-24% (w/w). However Ga showed a pronounced shear-thinning behavior and particularly higher viscosity compared with the gums extracted by baking pretreatment (Gb) and boiling water dehulling method (Gw). The mannose to galactose ratios (M/G ratio) for Gb, Gw and Ga were found to be 4.5, 4.4 and 6.9, respectively. The highest molecular weight of 3.31 × 106 Da was observed for the galactomannans of Gb.
KW - Dehulling pretreatment
KW - Galactomannan
KW - Gleditsia sinensis Lam. gum
KW - Rheological property
KW - Sugar composition
UR - http://www.scopus.com/inward/record.url?scp=79952534581&partnerID=8YFLogxK
U2 - 10.1016/j.foodhyd.2010.12.009
DO - 10.1016/j.foodhyd.2010.12.009
M3 - Artículo
AN - SCOPUS:79952534581
VL - 25
SP - 1337
EP - 1343
JO - Food Hydrocolloids
JF - Food Hydrocolloids
SN - 0268-005X
IS - 5
ER -