The viscosity curves of 1% w/w purified EHF and MHF pectin samples (standardized by the GalA content) are presented in Fig. 2a and b. The highest viscosity was exhibited by pectin extracted using water, followed by acid and then enzymes. The viscosity of pectin solutions is generally influenced by the Mw of the pectin. This was the case here, especially for MHF, the higher the Mw, the higher was the viscosity. However, it is important to note that, apart from its molecular weight the viscosity of a polysaccharide is also influenced by the molecular conformation, the number of reactive side groups, and ionic conditions. This could explain why the Mw of EHF did not correspond with the viscosity curves. The viscosity of a commercial citrus pectin (Sigma, P9135) is drastically lower (9 mPa s at 53 s−1) compared to pectins from gold kiwifruits, as shown inFig. 2, probably because of its low Mw (∼1.66 × 105 g/mol) and a branched structure (degree of branching ∼106).
The viscosity curves of 1% w/w purified EHF and MHF pectin samples (standardized by the GalA content) are presented in Fig. 2a and b. The highest viscosity was exhibited by pectin extracted using water, followed by acid and then enzymes. The viscosity of pectin solutions is generally influenced by the Mw of the pectin. This was the case here, especially for MHF, the higher the Mw, the higher was the viscosity. However, it is important to note that, apart from its molecular weight the viscosity of a polysaccharide is also influenced by the molecular conformation, the number of reactive side groups, and ionic conditions. This could explain why the Mw of EHF did not correspond with the viscosity curves. The viscosity of a commercial citrus pectin (Sigma, P9135) is drastically lower (9 mPa s at 53 s−1) compared to pectins from gold kiwifruits, as shown inFig. 2, probably because of its low Mw (∼1.66 × 105 g/mol) and a branched structure (degree of branching ∼106).
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