Interfacial properties of ultrahigh methoxylated pectin
Autor: | Mingming Wang, Yanping Cao, Jing Tan, Ruijin Yang, Jingran Liu, Zhumao Jiang, Xiao Hua |
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Rok vydání: | 2020 |
Předmět: |
food.ingredient
Pectin Surface Properties Intrinsic viscosity Analytical chemistry 02 engineering and technology Microscopy Atomic Force Biochemistry Micelle Surface tension 03 medical and health sciences symbols.namesake Gibbs isotherm food Microscopy Electron Transmission Structural Biology Surface Tension Citrus Pectin Particle Size Molecular Biology Micelles 030304 developmental biology 0303 health sciences Viscosity Chemistry General Medicine 021001 nanoscience & nanotechnology Molecular Weight Kinetics Transmission electron microscopy Critical micelle concentration symbols Pectins Emulsions Beta vulgaris Rheology Shear Strength 0210 nano-technology |
Zdroj: | International Journal of Biological Macromolecules. 152:403-410 |
ISSN: | 0141-8130 |
Popis: | The interfacial properties of ultrahigh methoxylated pectin (UHMP) prepared via esterification of citrus pectin (CP) were investigated. The intrinsic viscosity ([η]) of pectin was significantly decreased from 1211.5 mL/g to 294.9 mL/g as the degree of methylation (DM) increased from 63.18 ± 0.08% to 91.52 ± 0.11%. Surface tension (γ) analysis indicated that UHMP had a critical micelle concentration (CMC) of 0.8 g/L, which was slightly smaller than that of sugar beet pectin (SBP) (1.0 g/L). The morphology of the UHMP aggregation presented a network structure and irregular clusters at 10 μg/mL and 1 μg/mL based on atomic force microscopy (AFM). Transmission electron microscopy (TEM) observations further confirmed the self-aggregation behaviours and rod-like micelles of UHMP. The surface excess (Γ) was 1.69 ± 0.17 μmol/m2 for UHMP, which was lower than the values of SBP (1.88 ± 0.21 μmol/m2) and CP (2.91 ± 0.57 μmol/m2). Correspondingly, UHMP possessed the highest molecular area (A) of 0.99 ± 0.10 nm2. Thus, UHMP was proposed to be more flexible and extendable at the interface. The interfacial shear rheology study suggested that UHMP was able to form an elastic-dominant interfacial film to stabilize the oil/water interface. |
Databáze: | OpenAIRE |
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