Characterization Of Hydrophobic Interaction Of Galactomannan In Aqueous Solutions Using Fluorescence-Based Technique
CARBOHYDRATE POLYMERS(2021)
摘要
Fluorescence probing was used to study hydrophobic interactions of galactomannan (GM) obtained from fenugreek gum (FG), guar gum (GG), and locust bean gum (LBG) at different M/G ratios. The I-1/I-3 ratio of pyrene changed from 1.73 to 1.29, 1.22, and 1.29 for FG, GG and LBG, respectively, as the concentration of GM increased from 0.01 to 8.0 g/L at 30 degrees C. The critical aggregation concentration of FG, GG, and LBG increased from 1.04 to 3.84 g/L, 1.15 to 3.73 g/L, and 0.94 to 3.63 g/L, respectively, as temperature increased from 10 to 70 degrees C. Addition of Na2SO4 and NaSCN increased the I-1/I-3 ratio in dilute solution, but reduced it in semi-dilute solution, whereas adding urea reduced I-1/I-3 in dilute solution but increased it in semi-dilute solution. These results indicated that the CAC of GM, polarity and number of hydrophobic microdomains were highly dependent on the M/G ratio and galactose distribution.
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关键词
Mannose, galactose ratio, Fenugreek gum, Guar gum, Locust bean gum, Critical aggregation concentration
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