Abstract Ziziphus Jujuba cv. Muzao has attracted researchers for a long time, while residue of jujuba after extracted by water still contains many bioactivities. This paper presents the first study… Click to show full abstract
Abstract Ziziphus Jujuba cv. Muzao has attracted researchers for a long time, while residue of jujuba after extracted by water still contains many bioactivities. This paper presents the first study on in-depth structure analysis and its antioxidant of a pectic polysaccharide (PZJRP) separated and purified from Ziziphus Jujuba cv. Muzao residue through alkali extraction. Results of structural and morphological characterization according to high-performance gel-permeation chromatography, methylation analysis and partial acid hydrolysis etc. showed that PZJRP was composed of rhamnose, arabinose, glucose, galactose and galacturonic acid. Main chain of PZJRP including 1,2,4-linked rhamnose and 1,4-linked galacturonic acid, branches attached to C-4 of rhamnose, which suggested that PZJRP was a pectin polysaccharide belongs to rhamngalacturonan I type (RG-I). Significant antioxidant activity of PZJRP was revealed by protecting RAW264.7 cells against H2O2-induced oxidative stress. These findings demonstrated the potential of PZJRP to be a functional thickener as a novel food additive.
               
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