Relationship between molecular structure and lamellar and crystalline structure of rice starch. (15th April 2021)

• Record Type: Journal Article
• Authors: Zhong, Yuyue; Li, Zhihang; Qu, Jianzhou; Bertoft, Eric; Li, Ming; Zhu, Fan; Blennow, Andreas; Liu, Xingxun
• Is Part Of: Carbohydrate polymers. Volume 258(2021)
• Publication Date: 2021-04-15
• Subjects: AP1 short amylopectin chains (DP 6–36) analyzed by GPC -- AP2 long amylopectin chains (DP 37–100) analyzed by GPC -- AM1 short amylose chains (DP 101–300) analyzed by GPC -- AM2 intermediate amylopectin chains (DP 301–800) analyzed by GPC -- AM3 long amylopectin chains (DP 801–40, 000) analyzed by GPC -- AC amylose content -- RCX relative amount of fraction X -- ACLX average chain lengths (DP) of fraction X -- fa amylopectin chains with DP 6–12 analyzed by HPAEC -- fb1 amylopectin chains with DP 13–24 analyzed by HPAEC -- fb2 amylopectin chains with DP 25–36 analyzed by HPAEC -- fb3 amylopectin chains with DP>37 analyzed by HPAEC -- DB degree of branching -- D Bragg lamellar repeat distance -- da thickness of amorphous lamellae -- dc thickness of crystalline lamellae -- LP long period distance from 1D Correlation Function -- I scattering intensity -- PF prefactor of the power-law -- PLE the power-law exponent -- GPA the Gaussian peak area -- q0 the scattering peak position -- SH relative amounts of single helices -- DH relative amounts of double helices -- AR relative amounts of amorphous material -- GPC Gel Permeation chromatography -- HPAEC High-Performance Anion-Exchange Chromatography -- WAXS Wide Angle X-ray Scattering -- SAXS Small Angle X-ray Scattering; Rice starch -- Molecular structure -- Crystalline structure -- Lamellar structure -- Correlation analysis; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2021.117616
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: ACL of fb1 chains positively correlated with lamellar and crystalline order. ACLfb1 and RCfb2 positively correlated with amorphous lamellar thickness. Higher ACLfb3 contributed to more amorphous materials and less double helices. Higher single helix amounts resulted in lower crystalline and lamellar order. Abstract: The relationship between molecular structure and crystalline and lamellar structures of fifteen types of rice starches was studied. GPC and HPAEC were used for the molecular chain analysis and WAXS, SAXS, and CP/MAS 13 C NMR were employed for aggregation structural analysis. The amylopectin content and the average lengths of fb1 -chains (the degree of polymerization (DP) 13–24) were positively correlated with the amount of double helices ( r 2 = 0.92 and 0.57, respectively). In contrast, amylose content was positively correlated with the amounts of amorphous materials in starch ( r 2 = 0.77). The amount of double helices, which constitute a major part of the crystalline matrix, was positively correlated with the lamellar ordering ( r 2 = 0.81), and negatively correlated with the thickness of crystalline lamellae ( r 2 = 0.90) and lamellar repeat distance ( r 2 = 0.84). Conversely, the amount of the amorphous matrix was correlated with these parameters in the opposite way ( r 2 = 0.50, 0.75, and 0.75, respectively).