Multi-scale structural changes in lintnerized starches from three coloured potatoes. (15th May 2018)

• Record Type: Journal Article
• Authors: Yang, Liping; Xia, Yuesheng; Tao, Yuchen; Geng, Huihui; Ding, Yanyan; Zhou, Yibin
• Is Part Of: Carbohydrate polymers. Volume 188(2018)
• Page Start: 228
• Page End: 235
• Publication Date: 2018-05-15
• Subjects: Hydrochloric acid (PubChem CID: 313) -- Sodium acetate (PubChem CID: 517045) -- Dimethyl sulfoxide (PubChem CID: 679) -- Sulfuric acid (PubChem CID: 1118) -- Acetic acid (PubChem CID: 176) -- Sodium cyanoborohydride (PubChem CID: 20587905) -- Phenol (PubChem CID: 996); Potato starch -- Lintnerization -- Molecular size distribution -- Morphological characteristics -- Crystal properties; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.02.017
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Three lintnerized potato starches were prepared from three potato cultivars. Three kinds of potato starch showed different susceptibilities to acid hydrolysis. The showed markedly different HPAEC chromatograms. The three lintners retained B-type crystal, but relative crystallinity increased. The starch multi-scale structures changed significantly during the lintnerization. Abstract: Three kinds of potato starch were treated with 2.2 N HCl at 35 °C for 40 days, and their susceptibility to acid hydrolysis and the resulting structural changes were evaluated. Red potato starch was more susceptible to acid hydrolysis and presented highest rate of hydrolysis. Lintnerized starches had relatively low average molecular weights and z-average radius of gyration. HPAEC analyses showed three lintners presented different molecular size distributions. Lintnerized yellow potato starch had few chains of DP ≤ 12 (2.58 mol%) and more chains of DP ≥ 37 (8.16 mol%). Furthermore, the similarities of the branch-chain length distributions before and after debranching indicated the lintners consisted primarily of linear molecules. After lintnerization, most starch granules were degraded, and the birefringence disappeared from some granules. X-ray diffraction patterns revealed that the relative crystallinity significantly increased after lintnerization. DSC analyses showed that lintners displayed broader thermal-transitions.