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Bertoft E, Blennow A, Hamaker BR. Perspectives on Starch Structure, Function, and Synthesis in Relation to the Backbone Model of Amylopectin. Biomacromolecules 2024; 25:5389-5401. [PMID: 39149775 DOI: 10.1021/acs.biomac.4c00369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Understanding functionality of polysaccharides such as starch requires molecular representations that account for their functional characteristics, such as those related to gelatinization, gelation, and crystallization. Starch macromolecules are inherently very complex, and precise structures can only be deduced from large data sets to generate relational models. For amylopectin, the major, well-organized, branched part of starch, two main molecular representations describe its structure: the classical cluster model and the more recent backbone model. Continuously emerging data call for inspection of these models, necessary revisions, and adoption of the preferred representation. The accumulated molecular and functional data support the backbone model and it well accommodates our present knowledge related to the biosynthesis of starch. This Perspective focuses on our current knowledge of starch structure and functionality directly in relation to the backbone model of amylopectin.
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Affiliation(s)
- Eric Bertoft
- Bertoft Solutions, Gamla Sampasvägen 18, 20960 Turku, Finland
| | - Andreas Blennow
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, 1871 Frederiksberg, Denmark
| | - Bruce R Hamaker
- Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, West Lafayette, Indiana 47907-2009, United States
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Cluster Size of Amylopectin and Nanosized Amylopectin Fragments Characterized by Pyrene Excimer Formation. Polymers (Basel) 2022; 14:polym14163418. [PMID: 36015675 PMCID: PMC9412863 DOI: 10.3390/polym14163418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/16/2022] [Accepted: 08/18/2022] [Indexed: 01/26/2023] Open
Abstract
Amylopectin from waxy corn and the three nanosized amylopectin fragments (NAFs)—NAF(56), NAF(20), and NAF(8)—from waxy corn starch with a hydrodynamic diameter of 227, 56, 20, and 8 nm, respectively, were randomly labeled with 1-pyrenebutyric acid. The efficiency of these pyrene-labeled amylopectin-based polysaccharides (Py-AbPS) for pyrene excimer formation (PEF) upon diffusive encounter between an excited and a ground-state pyrene increased with increasing concentration of unlabeled NAF(56) in Py-AbPS dispersions in DMSO. Fluorescence decay analysis of the Py-AbPS dispersions in DMSO prepared with increasing [NAF(56)] yielded the maximum number (Nblobexp) of anhydroglucose units (AGUs) separating two pyrene-labeled AGUs while still allowing PEF. Comparison of Nblobexp with Nblobtheo, obtained by conducting molecular mechanics optimizations on helical oligosaccharide constructs with HyperChem, led to a relationship between the interhelical distance (dh-h) in a cluster of oligosaccharide helices, [NAF(56)], and the number of helices in a cluster. It was found that the AbPSs were composed of building blocks made of 3.5 (±0.9) helices that self-assembled into increasingly larger clusters with increasing [NAF(56)]. The ability of PEF-based experiments to yield the cluster size of AbPSs provides a new experimental means to probe the interior of AbPSs at the molecular level.
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Tetlow IJ, Bertoft E. A Review of Starch Biosynthesis in Relation to the Building Block-Backbone Model. Int J Mol Sci 2020; 21:E7011. [PMID: 32977627 PMCID: PMC7582286 DOI: 10.3390/ijms21197011] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/15/2020] [Accepted: 09/16/2020] [Indexed: 01/31/2023] Open
Abstract
Starch is a water-insoluble polymer of glucose synthesized as discrete granules inside the stroma of plastids in plant cells. Starch reserves provide a source of carbohydrate for immediate growth and development, and act as long term carbon stores in endosperms and seed tissues for growth of the next generation, making starch of huge agricultural importance. The starch granule has a highly complex hierarchical structure arising from the combined actions of a large array of enzymes as well as physicochemical self-assembly mechanisms. Understanding the precise nature of granule architecture, and how both biological and abiotic factors determine this structure is of both fundamental and practical importance. This review outlines current knowledge of granule architecture and the starch biosynthesis pathway in relation to the building block-backbone model of starch structure. We highlight the gaps in our knowledge in relation to our understanding of the structure and synthesis of starch, and argue that the building block-backbone model takes accurate account of both structural and biochemical data.
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Affiliation(s)
- Ian J. Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON N1G 2W1, Canada
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Abstract
Starch is a major food supply for humanity. It is produced in seeds, rhizomes, roots and tubers in the form of semi-crystalline granules with unique properties for each plant. Though the size and morphology of the granules is specific for each plant species, their internal structures have remarkably similar architecture, consisting of growth rings, blocklets, and crystalline and amorphous lamellae. The basic components of starch granules are two polyglucans, namely amylose and amylopectin. The molecular structure of amylose is comparatively simple as it consists of glucose residues connected through α-(1,4)-linkages to long chains with a few α-(1,6)-branches. Amylopectin, which is the major component, has the same basic structure, but it has considerably shorter chains and a lot of α-(1,6)-branches. This results in a very complex, three-dimensional structure, the nature of which remains uncertain. Several models of the amylopectin structure have been suggested through the years, and in this review two models are described, namely the “cluster model” and the “building block backbone model”. The structure of the starch granules is discussed in light of both models.
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Magallanes-Cruz PA, Flores-Silva PC, Bello-Perez LA. Starch Structure Influences Its Digestibility: A Review. J Food Sci 2017; 82:2016-2023. [PMID: 28753728 DOI: 10.1111/1750-3841.13809] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 05/24/2017] [Accepted: 06/14/2017] [Indexed: 12/21/2022]
Abstract
Twenty-five years ago, it was found that a significant fraction of the starch present in foods is not digested in the small intestine and continues to the large intestine, where it is fermented by the microbiota; this fraction was named resistant starch (RS). It was also reported that there is a fraction of starch that is slowly digested, sustaining a release of glucose in the small intestine. Later, health benefits were found to be associated with the consumption of this fraction, called slowly digestible starch (SDS). The authors declare both fractions to be "nutraceutical starch." An overview of the structure of both fractions (RS and SDS), as well as their nutraceutical characteristics, is presented with the objective of suggesting methods and processes that will increase both fractions in starchy foods and prevent diseases that are associated with the consumption of glycemic carbohydrates.
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Affiliation(s)
- Perla A Magallanes-Cruz
- Inst. Politécnico Nacional, CEPROBI. Km. 6.6 Carr. Yautepec-Jojutla Col. San Isidro, 62731, Yautepec, Morelos, México
| | - Pamela C Flores-Silva
- Inst. Politécnico Nacional, CEPROBI. Km. 6.6 Carr. Yautepec-Jojutla Col. San Isidro, 62731, Yautepec, Morelos, México
| | - Luis A Bello-Perez
- Inst. Politécnico Nacional, CEPROBI. Km. 6.6 Carr. Yautepec-Jojutla Col. San Isidro, 62731, Yautepec, Morelos, México
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Peymanpour G, Marcone M, Ragaee S, Tetlow I, Lane CC, Seetharaman K, Bertoft E. On the molecular structure of the amylopectin fraction isolated from “high-amylose” ae maize starches. Int J Biol Macromol 2016; 91:768-77. [DOI: 10.1016/j.ijbiomac.2016.06.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 06/08/2016] [Accepted: 06/10/2016] [Indexed: 10/21/2022]
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Structure of clusters and building blocks in amylopectin from African rice accessions. Carbohydr Polym 2016; 148:125-33. [DOI: 10.1016/j.carbpol.2016.04.057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/11/2016] [Accepted: 04/12/2016] [Indexed: 12/13/2022]
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Kalinga DN, Bertoft E. Internal structure of amylopectin from the pericarp tissue of developing wheat kernels. STARCH-STARKE 2015. [DOI: 10.1002/star.201500187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Eric Bertoft
- Department of Food Science and Nutrition; University of Minnesota; St Paul MN USA
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Kong X, Chen Y, Zhu P, Sui Z, Corke H, Bao J. Relationships among Genetic, Structural, and Functional Properties of Rice Starch. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:6241-8. [PMID: 26083191 DOI: 10.1021/acs.jafc.5b02143] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We determined the relationships among the structural properties, in vitro digestibility, and genetic factors in starches of 14 rice cultivars. Weight-based chain-length distributions in amylopectin ranged from 18.07% to 24.71% (fa, DP 6-12), 45.01% to 55.67% (fb1, DP 13-24), 12.72% to 14.05% (fb2, DP 25-36), and 10.80 to 20.72% (fb3, DP > 36), respectively. The contents of rapidly digestible starch (RDS), slowly digestible starch (SDS), and resistant starch (RS) ranged from 78.5% to 87.5%, 1.2% to 6.0%, and 10.1% to 18.0%, respectively. AAC was negatively correlated with RDS content but positively correlated with RS content in rice starch. The proportion of short chains in amylopectin, i.e. the amount of fraction IIa (FrIIa) fractionated by gel permeation chromatography (GPC), was positively correlated with RDS. Starch synthase IIa (SSIIa) gene controlled the degree of crystallinity, the amount of fa chains of amylopectin. SSIIIa gene controlled the amount of fb1 chains. Wx gene controlled the FrI, FrIIa, RDS, and RS. Starch debranching enzyme isoamylase II (ISA2) gene also controlled the RDS, which may suggest that RDS was also affected by amylopectin structure, although no correlation between them was found. This study indicated that genetics (i.e., starch biosynthesis related genes) controlled the structural properties of starch, and both amylose content and amylopectin fine structure determined functional properties of rice starch (i.e., the digestion), each in a different way. Understanding the "genetics-structure-function" relationships in rice starches will assist plant breeders and food processors in developing new rice varieties and functional foods.
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Affiliation(s)
- Xiangli Kong
- †Institute of Nuclear Agricultural Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Yaling Chen
- †Institute of Nuclear Agricultural Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Ping Zhu
- †Institute of Nuclear Agricultural Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Zhongquan Sui
- ‡Department of Food Science and Engineering, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Harold Corke
- §School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
- ∥Glyn O. Philips Hydrocolloid Research Centre at HUT, Hubei University of Technology, Wuhan 430068, People's Republic of China
| | - Jinsong Bao
- †Institute of Nuclear Agricultural Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China
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Branching patterns in leaf starches from Arabidopsis mutants deficient in diverse starch synthases. Carbohydr Res 2015; 401:96-108. [DOI: 10.1016/j.carres.2014.09.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/22/2014] [Accepted: 09/24/2014] [Indexed: 01/09/2023]
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Kalinga DN, Bertoft E, Tetlow I, Seetharaman K. Structure of clusters and building blocks in amylopectin from developing wheat endosperm. Carbohydr Polym 2014; 112:325-33. [DOI: 10.1016/j.carbpol.2014.05.051] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 05/02/2014] [Accepted: 05/14/2014] [Indexed: 10/25/2022]
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Affiliation(s)
- Eric Bertoft
- Department of Food Science, University of Guelph, Guelph, ON, Canada. Phone: (519) 824-4120, ext. 58054. Fax: (519) 824-6631. E-mail:
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Lin JH, Singh H, Ciao JY, Kao WT, Huang WH, Chang YH. Genotype diversity in structure of amylopectin of waxy rice and its influence on gelatinization properties. Carbohydr Polym 2013; 92:1858-64. [DOI: 10.1016/j.carbpol.2012.11.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Revised: 10/14/2012] [Accepted: 11/07/2012] [Indexed: 11/17/2022]
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Bertoft E, Koch K, Åman P. Building block organisation of clusters in amylopectin from different structural types. Int J Biol Macromol 2012; 50:1212-23. [DOI: 10.1016/j.ijbiomac.2012.03.004] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 02/24/2012] [Accepted: 03/09/2012] [Indexed: 11/28/2022]
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The building block structure of barley amylopectin. Int J Biol Macromol 2011; 49:900-9. [DOI: 10.1016/j.ijbiomac.2011.08.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 08/02/2011] [Accepted: 08/03/2011] [Indexed: 11/24/2022]
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Structures of building blocks in clusters of sweetpotato amylopectin. Carbohydr Res 2011; 346:2913-25. [DOI: 10.1016/j.carres.2011.10.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2011] [Revised: 06/10/2011] [Accepted: 10/07/2011] [Indexed: 11/23/2022]
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Bertoft E, Källman A, Koch K, Andersson R, Åman P. The cluster structure of barley amylopectins of different genetic backgrounds. Int J Biol Macromol 2011; 49:441-53. [DOI: 10.1016/j.ijbiomac.2011.04.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Revised: 04/19/2011] [Accepted: 04/22/2011] [Indexed: 11/27/2022]
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Zhu F, Corke H, Åman P, Bertoft E. Structures of clusters in sweetpotato amylopectin. Carbohydr Res 2011; 346:1112-21. [DOI: 10.1016/j.carres.2011.03.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 02/15/2011] [Accepted: 03/02/2011] [Indexed: 10/18/2022]
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Bertoft E, Laohaphatanalert K, Piyachomkwan K, Sriroth K. The fine structure of cassava starch amylopectin. Part 2: Building block structure of clusters. Int J Biol Macromol 2010; 47:325-35. [DOI: 10.1016/j.ijbiomac.2010.05.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2010] [Accepted: 05/24/2010] [Indexed: 11/25/2022]
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Laohaphatanaleart K, Piyachomkwan K, Sriroth K, Bertoft E. The fine structure of cassava starch amylopectin. Int J Biol Macromol 2010; 47:317-24. [DOI: 10.1016/j.ijbiomac.2010.01.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 01/07/2010] [Accepted: 01/11/2010] [Indexed: 11/15/2022]
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Witt T, Gidley MJ, Gilbert RG. Starch digestion mechanistic information from the time evolution of molecular size distributions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:8444-8452. [PMID: 20572670 DOI: 10.1021/jf101063m] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Size-exclusion chromatography [SEC, also termed gel permeation chromatography (GPC)] is used to measure the time evolution of the distributions of molecular size and of branch length as starch is subjected to in vitro digestion, including studying the development of enzyme-resistant starch. The method is applied to maize starches with varying amylose contents; the starches were extruded so as to provide an analogue for processed food. The initial rates of digestion of amylose and amylopectin components were found to be the same for high-amylose starches. A small starch species, not present in the original starting material, was formed during the digestion process; this new species has a slower digestion rate and is probably formed by retrogradation of longer branches of amylose and amylopectin as they are partially or wholly liberated from their parent starch molecule during the digestion process. The data suggest that the well-known connection between high amylose content and resistant starch arises from the greater number of longer branches, which can form the small retrograded species. The method is useful for the purpose of comparisons between different starches undergoing the process of digestion, by observing the changes in their molecular structures, as an adjunct to detailed studies of the enzyme-resistant fraction.
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Affiliation(s)
- Torsten Witt
- Centre for Nutrition & Food Sciences, The University of Queensland, Brisbane, Qld 4072, Australia
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Pérez S, Bertoft E. The molecular structures of starch components and their contribution to the architecture of starch granules: A comprehensive review. STARCH-STARKE 2010. [DOI: 10.1002/star.201000013] [Citation(s) in RCA: 897] [Impact Index Per Article: 64.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mechanical and structural properties of solution-cast high-amylose maize starch films. Int J Biol Macromol 2010; 46:13-9. [DOI: 10.1016/j.ijbiomac.2009.10.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Revised: 09/08/2009] [Accepted: 10/03/2009] [Indexed: 11/18/2022]
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Kong X, Corke H, Bertoft E. Fine structure characterization of amylopectins from grain amaranth starch. Carbohydr Res 2009; 344:1701-8. [DOI: 10.1016/j.carres.2009.05.032] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2009] [Revised: 05/17/2009] [Accepted: 05/20/2009] [Indexed: 11/28/2022]
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Tao Y, Yan Y, Xu W. Shrinking factors of hyperbranched polysaccharide from fungus. Carbohydr Res 2009; 344:1311-8. [DOI: 10.1016/j.carres.2009.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 04/14/2009] [Accepted: 05/07/2009] [Indexed: 10/20/2022]
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Kong X, Bertoft E, Bao J, Corke H. Molecular structure of amylopectin from amaranth starch and its effect on physicochemical properties. Int J Biol Macromol 2008; 43:377-82. [DOI: 10.1016/j.ijbiomac.2008.07.018] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 07/25/2008] [Accepted: 07/28/2008] [Indexed: 10/21/2022]
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Matheson N, Caldwell R. Modeling of α(1–4) chain arrangements in α(1–4)(1–6) glucans: The action and outcome of β-amylase and Pseudomonas stutzeri amylase on an α(1–4)(1–6) glucan model. Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2007.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Rolland-Sabaté A, Colonna P, Mendez-Montealvo MG, Planchot V. Branching Features of Amylopectins and Glycogen Determined by Asymmetrical Flow Field Flow Fractionation Coupled with Multiangle Laser Light Scattering. Biomacromolecules 2007; 8:2520-32. [PMID: 17645307 DOI: 10.1021/bm070024z] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aim of this work was to characterize starch polysaccharides using asymmetrical flow field flow fractionation coupled with multiangle laser light scattering. Amylopectins from eight different botanical sources and rabbit liver glycogen were studied. Amylopectins and glycogen were completely solubilized and analyzed, and high mass recoveries were achieved (81.7-100.0%). Amylopectin Mw, RG, and the hydrodynamic coefficient nuG (the slope of the log-log plot of RGi vs Mi) were within the ranges 1.05-3.18 x 10(8) g mol(-1), 163-229 nm, 0.37-0.49, respectively. The data were also considered in terms of structural parameters. The results were analyzed by comparison with the theory of hyperbranched polymers (Flory, P. J. Principles of Polymer Chemistry; Cornell University Press: Ithaca, NY, 1953; Burchard, W. Macromolecules, 1977, 10, 919-927). This theory, based upon the ABC model, has been shown to underestimate the branching degrees of amylopectins. However, quantitative agreement with the data in the literature was found for amylopectins when using the ABC model modified by the introduction of a multiplying factor, determined from previously described amylopectin structures in terms of the number of branching point calculations.
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Xia H, Thompson DB. Debranching of β-Dextrins to Explore Branching Patterns of Amylopectins from Three Maize Genotypes. Cereal Chem 2006. [DOI: 10.1094/cc-83-0668] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Huan Xia
- Department of Food Science, The Pennsylvania State University, University Park 16802
| | - Donald B. Thompson
- Department of Food Science, The Pennsylvania State University, University Park 16802
- Corresponding author. Phone: 814-863-0481. Fax: 814-863-6132. E-mail: dbt1@ psu.edu
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Yao Y, Thompson DB, Guiltinan MJ. Maize starch-branching enzyme isoforms and amylopectin structure. In the absence of starch-branching enzyme IIb, the further absence of starch-branching enzyme Ia leads to increased branching. PLANT PHYSIOLOGY 2004; 136:3515-23. [PMID: 15516514 PMCID: PMC527151 DOI: 10.1104/pp.104.043315] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2004] [Revised: 09/01/2004] [Accepted: 09/08/2004] [Indexed: 05/21/2023]
Abstract
Previous studies indicated that the deficiency of starch-branching enzyme (SBE) Ia in the single mutant sbe1a::Mu (sbe1a) has no impact on endosperm starch structure, whereas the deficiency of SBEIIb in the ae mutant is well known to reduce the branching of starch. We hypothesized that in maize (Zea mays) endosperm, the function of SBEIIb is predominant to that of SBEIa, and SBEIa would have an observable effect only on amylopectin structure in the absence of SBEIIb. To test this hypothesis, the mutant sbe1a was introgressed into lines containing either wx (lacking the granule-bound starch synthase GBSSI) or ae wx (lacking both SBEIIb and GBSSI) in the W64A background. Both western blotting and zymogram analysis confirmed the SBEIa deficiency in sbe1a wx and sbe1a ae wx, and the SBEIIb deficiency in ae wx and sbe1a ae wx. Using zymogram analysis, no pleiotropic effects of sbe1a genes on SBEIIa, starch synthase, or starch-debranching enzyme isoforms were observed. High-performance size exclusion chromatography analysis shows that the chain-length profiles of amylopectin as well as beta-limit dextrin were indistinguishable between wx and sbe1a wx, whereas significant differences for both were observed between ae wx and sbe1a ae wx, suggesting an effect of SBEIa on amylopectin biosynthesis that is observable only in the absence of SBEIIb. The amylopectin branch density and the average number of branches per cluster were both higher in endosperm starch from sbe1a ae wx than from ae wx. These results indicate possible functional interactions between SBE isoforms that may involve enzymatic inhibition. Both the cluster repeat distance and the distance between branch points on the short intracluster chains were similar for all genotypes however, suggesting a similar pattern of individual SBE isoforms in cluster initiation and the determination of branch point location.
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Affiliation(s)
- Yuan Yao
- The Huck Institutes of the Life Sciences , The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Molecular Basis of the Gelatinisation and Swelling Characteristics of Waxy Rice Starches Grown in the Same Location During the Same Season. J Cereal Sci 2003. [DOI: 10.1006/jcrs.2002.0508] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Gelders GG, Bijnens L, Loosveld AM, Vidts A, Delcour JA. Fractionation of starch hydrolysates into dextrins with narrow molecular mass distribution and their detection by high-performance anion-exchange chromatography with pulsed amperometric detection. J Chromatogr A 2003; 992:75-83. [PMID: 12735464 DOI: 10.1016/s0021-9673(03)00313-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Low levels of high-molecular-mass dextrins in starch hydrolysates can be detected by high-performance anion-exchange chromatography with pulsed amperometric detection in spite of their low responses by dialysis of the starch hydrolysate and fractionation of the resulting adialysate with ethanol (final concentration 30-80% at 6 degrees C). In doing so, dextrin fractions with a relatively narrow molecular mass distribution were obtained.
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Affiliation(s)
- Greta G Gelders
- Laboratory of Food Chemistry, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium.
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Klucinec JD, Thompson DB. Amylopectin Nature and Amylose-to-Amylopectin Ratio as Influences on the Behavior of Gels of Dispersed Starch. Cereal Chem 2002. [DOI: 10.1094/cchem.2002.79.1.24] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jeffrey D. Klucinec
- Department of Food Science, Penn State University, University Park, PA 16802
| | - Donald B. Thompson
- Department of Food Science, Penn State University, University Park, PA 16802
- Corresponding author. E-mail: Phone: (814) 863-2950. Fax: (814) 863-6132
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Bertoft E, Boyer C, Manelius R, Åvall AK. Observations on the α-Amylolysis Pattern of Some Waxy Maize Starches from Inbred Line Ia453. Cereal Chem 2000. [DOI: 10.1094/cchem.2000.77.5.657] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Eric Bertoft
- Department of Biochemistry and Pharmacy, Åbo Akademi University, BioCity, P.O. Box 66, FIN-20521 Turku, Finland
- Corresponding author: Fax: +358-2-2154745. E-mail:
| | - Charles Boyer
- Oregon State University, Department of Horticulture, Agriculture and Life Science 4017, Corvallis, OR 97331-7304
| | - Robin Manelius
- Department of Biochemistry and Pharmacy, Åbo Akademi University, BioCity, P.O. Box 66, FIN-20521 Turku, Finland
| | - Ann-Kristin Åvall
- Department of Biochemistry and Pharmacy, Åbo Akademi University, BioCity, P.O. Box 66, FIN-20521 Turku, Finland
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Gérard C, Planchot V, Colonna P, Bertoft E. Relationship between branching density and crystalline structure of A- and B-type maize mutant starches. Carbohydr Res 2000; 326:130-44. [PMID: 10877096 DOI: 10.1016/s0008-6215(00)00025-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Amylopectin from two double maize mutant starches of A-crystalline (wxdu) and B-crystalline type (aewx) was subjected successively to hydrolysis involving alpha and beta amylases, which isolated clusters and all branching zones of clusters (BZC). Enzymatic analysis together with ionic and size-exclusion chromatography revealed the structural features of the clusters and BZC and their role in starch crystallization. A-type clusters were larger (dp(n) > 80) and contained more (but shorter) chains than B-type clusters. The BZC of A-type starch was also larger, but with a shorter distance between the branching points than in B-type BZC. A-type clusters had a densely packed structure and B-type a poorly branched structure. Models for the structure of A- and B-type clusters are presented, and a hypothesis for the influence of cluster geometry on crystallization is proposed.
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