title: Characterisation of the turbid particles in the extraction of sugar beet pectins.
abstract: This paper was aimed at characterising the insoluble substances (IS) responsible for the turbidity of the extract and impurity of the resulting pectins. Results showed that the IS caused a significant increase in the turbidity of the extract. The IS had bi-pyramidal shapes under the SEM observation. The observed XRD peaks for the IS were similar to those of calcium oxalate dihydrate (COD). Moreover, the IS consisted of mainly oxalate and calcium. Results from the present study indicate the IS is COD. The influence of the IS on the purity of pectin was also studied. The presence of the IS in the pectins indicated the IS can precipitate with pectins during the alcohol precipitation, thereby contaminating the resulting pectins.
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Guo
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Si-Ming
authors.initials: SM
authors.lastname: Zhu
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Tang
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; State Key Laboratory of Pulp and Paper Engineering, Guangzhou 510640, China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, China. Electronic address: lfshjyu@scut.edu.cn.
authors.forename: Shu-Juan
authors.initials: SJ
authors.lastname: Yu
mesh_terms: D027461:Beta vulgaris / Q000737:chemistry*; D002129:Calcium Oxalate / Q000737:chemistry*; D010368:Pectins / Q000737:chemistry*
chemical_list: D002129:Calcium Oxalate; D010368:Pectins
keywords: Calcium oxalate dihydrate; Insoluble substance; Purity; Sugar beet pectins