Journal
CARBOHYDRATE POLYMERS
Volume 154, Issue -, Pages 176-185Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.08.010
Keywords
Molecular weight; Kinetics model; Synergistic effect; Demethoxylation; Primary structure; Nanostructure
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Funding
- National Science Foundation of China [31371872]
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This study investigated the degradation kinetics and structural properties of pectin with combining ultrasound and pectinase treatment. Ultrasound at an intensity of 4.5 W mL(-1) and a time of 10 min significantly enhanced the enzymatic degradation of pectin weight-average molecular weight (M-w). The degradation kinetics model of pectin followed 1/M-wt- 1/M-w0 - kt, suggesting the randomness of the degradation process. Synergistic effects of ultrasound and pectinase were observed at 20-60 degrees C and were more effective at lower temperatures. Furthermore, the degree of methoxylation (DM) of sonoenzymolysis pectin significantly decreased whereas the degree of acetylation (DAc) remained unchanged compared to the original and enzymolysis pectin. Simultaneous functions of ultrasound and pectinase caused severe decomposition in pectin homogalacturonan (HG) regions without altering the monosaccharides types, configurations and glycoside linkages of the pectin samples. The complex polymeric structures of pectin transformed into smaller units with simpler branches and shorter chains after sonoenzymolysis reactions. (C) 2016 Published by Elsevier Ltd.
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