1
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Chen X, Li X, Qiao Z, Xiu H, Bai H. Using an aromatic amide as nucleating agent to enhance the crystallization and dimensional stability of poly(3-hydroxybutyrate-co-3-hydroxyhexanate). Int J Biol Macromol 2023; 253:127632. [PMID: 37884241 DOI: 10.1016/j.ijbiomac.2023.127632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/20/2023] [Accepted: 10/21/2023] [Indexed: 10/28/2023]
Abstract
Biosynthesized poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) has emerged as a promising biodegradable polymer with a great potential to compete with traditional petroleum-based plastics, however, the poor crystallization ability makes it challenge to transform into high-performance products via common melt-processing methods. Herein, we demonstrate that N,N'-dicyclohexyl-2,6-naphthalenedicarboxamide (TMB) can serve as an efficient nucleating agent to significantly enhance the crystallization and resulting storage stability of PHBHHx. The results indicate that PHBHHx with small amounts of TMB (0.3-0.5 wt%) can crystallize completely even under a rapid cooling rate of 100 °C/min and the isothermal crystallization time is greatly reduced. As a result, the crystallinity of the injection-molded PHBHHx products is increased from 24.5 % to 39.5 %, without secondary crystallization after being stored at room temperature for 6 h. The products exhibit superior dimensional stability and the post-shrinkage can be decreased to as low as 0.1 %. Our work offers a feasible method to develop high-performance PHBHHx materials with remarkably enhanced crystallization ability.
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Affiliation(s)
- Xiaonan Chen
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Xiangyang Li
- Shanxi Provincial Institute of Chemical Industry, (Co., Ltd.), Taiyuan 030000, PR China
| | - Zeshuang Qiao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Hao Xiu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Hongwei Bai
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China.
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2
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Righetti MC, Di Lorenzo ML, Cavallo D, Müller AJ, Gazzano M. Structural evolution of poly(butylene succinate) crystals on heating with the formation of a dual lamellar population, as monitored by temperature-dependent WAXS/SAXS analysis. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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3
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Morphology and crystallization behaviour of polyhydroxyalkanoates-based blends and composites: A review. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Nguyen TV, Nagata T, Noso K, Kaji K, Masunaga H, Hoshino T, Sakurai S, Sasaki S. Comparison between Ultrathin Films and the Bulk of Microbial Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) with Regard to Their Melt-Isothermal Crystallization Kinetics. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toan Van Nguyen
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
| | - Toshiteru Nagata
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
| | - Kosei Noso
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
| | - Kenshiro Kaji
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Taiki Hoshino
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Shinichi Sakurai
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Sono Sasaki
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho,
Sakyo-ku, Kyoto 606-8585, Japan
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
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5
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Kim C, Jarumaneeroj C, Rungswang W, Jin KS, Ree M. A comprehensive small angle X-ray scattering analysis on morphological structure of semicrystalline linear polymer in bulk state. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Van Nguyen T, Nagata T, Noso K, Kaji K, Masunaga H, Hoshino T, Hikima T, Sakurai S, Yamamoto K, Miura Y, Aoki T, Yamane H, Sasaki S. Effect of the 3-Hydroxyhexanoate Content on Melt-Isothermal Crystallization Behavior of Microbial Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate). Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toan Van Nguyen
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Toshiteru Nagata
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Kosei Noso
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Kenshiro Kaji
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Taiki Hoshino
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Takaaki Hikima
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Shinichi Sakurai
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Kenta Yamamoto
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Yuta Miura
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Takashi Aoki
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Hideki Yamane
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
| | - Sono Sasaki
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, 1, Matsugasaki Hashikami-cho, Sakyo-ku, Kyoto 606-8585, Japan
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7
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Barbosa J, Perin GB, Felisberti MI. Plasticization of Poly(3-hydroxybutyrate- co-3-hydroxyvalerate) with an Oligomeric Polyester: Miscibility and Effect of the Microstructure and Plasticizer Distribution on Thermal and Mechanical Properties. ACS OMEGA 2021; 6:3278-3290. [PMID: 33553946 PMCID: PMC7860244 DOI: 10.1021/acsomega.0c05765] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/08/2021] [Indexed: 06/12/2023]
Abstract
In the last few decades, many efforts have been made to make poly(3-hydroxybutyrate) (PHB) and its copolymers more suitable for industrial production and large-scale use. Plasticization, especially using biodegradable oligomeric plasticizers, has been one of the strategies for this purpose. However, PHB and its copolymers generally present low miscibility with plasticizers. An understanding of the plasticizer distribution between the mobile and rigid amorphous phases and how this influences thermal, mechanical, and morphological properties remains a challenge. Herein, formulations of poly(hydroxybutyrate-co-valerate) (PHBV) plasticized with an oligomeric polyester based on lactic acid, adipic acid, and 1,2-propanediol (PLAP) were prepared by melt extrusion. The effects of the PLAP content on the processability, miscibility, and microstructure of the semicrystalline PHBV and on the thermal, morphological, and mechanical properties of the formulations were investigated. The compositions of the mobile and rigid amorphous phases of the PHBV/PLAP formulations were easily estimated by combining dynamic mechanical data and the Fox equation, which showed a heterogeneous distribution of PLAP in these two phases. An increase in the PLAP mass fraction in the formulations led to progressive changes in the composition of the amorphous phases, an increase of both crystalline lamellae and interlamellar layer thickness, and a decrease in the melting and glass transition temperatures as well as the PHBV stiffness. The Flory-Huggins interaction parameter varied with the formulation composition in the range of -0.299 to -0.081. The critical PLAP mass fraction of 0.37 obtained from thermodynamic data is close to the value estimated from dynamic mechanical analysis (DMA) data and the Fox equation. The mechanical properties showed a close relationship with the distribution of PLAP in the rigid and mobile amorphous phases as well as with the microstructure of the crystalline phase of PHBV in the formulations.
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8
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Melt density, equilibrium melting temperature, and crystallization characteristics of highly pure cyclic poly(ε-Caprolactone)s. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122899] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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9
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Umemura RT, Felisberti MI. Plasticization of poly(3‐hydroxybutyrate) with triethyl citrate: Thermal and mechanical properties, morphology, and kinetics of crystallization. J Appl Polym Sci 2020. [DOI: 10.1002/app.49990] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Nanoparticles of niobium oxyhydroxide incorporated in different polymers for photocatalytic degradation of dye. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1824-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Tong BB, Ding YH. Crystallization Kinetics and Multiple Melting Behavior of Biodegradable Poly(3-hydroxybutyrate-co-4-hydroxybutyrate). INT POLYM PROC 2018. [DOI: 10.3139/217.3599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The crystallization and melting behavior of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] with 11 % 4HB content was investigated by differential scanning calorimetry (DSC), small and wide angle X-ray scattering (SAXS and WAXS). The Avrami analysis was performed to obtain the kinetic parameters of crystallization. The results showed that the Avrami equation was suitable for describing the isothermal and nonisothermal crystallization processes of P(3HB-co-4HB). Based on the values of the equilibrium melting temperature and the half-time of crystallization, its nucleation constant of crystal growth kinetics was obtained by using the Lauritzen-Hoffman model, which was found to be 1.92 × 105 K2, lower than that for pure PHB. During the subsequent heating process, quite different multiple melting behaviors were observed for P(3HB-co-4HB) crystallized isothermally or nonisothermally. The origins of the multiple melting behaviors were discussed based on either the presence of dual lamellar thicknesses or the melt-recrystallization mechanism. In general, the crystallization and melting behaviors were elucidated by this work.
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Affiliation(s)
- B.-B. Tong
- Department of Mechanical and Electrical Engineering , Yellow River Conservancy Technology Institute, Kaifeng , PRC
| | - Y.-H. Ding
- Henan Xinfei Electrical Appliance Co. , Ltd., Xinxiang , PRC
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12
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Reorientation of the poly(3-hydroxybutyrate- co -3-hydroxyhexanoate) crystal in thin film induced by polyethylene glycol. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.05.050] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Crétois R, Chenal JM, Sheibat-Othman N, Monnier A, Martin C, Astruz O, Kurusu R, Demarquette NR. Physical explanations about the improvement of PolyHydroxyButyrate ductility: Hidden effect of plasticizer on physical ageing. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.09.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Tognana S, Salgueiro W. Influence of the rigid amorphous fraction and segregation during crystallization in PHB/DGEBA blends. Polym J 2015. [DOI: 10.1038/pj.2015.71] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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15
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González-Ausejo J, Sánchez-Safont E, Gámez-Pérez J, Cabedo L. On the use of tris(nonylphenyl) phosphite as a chain extender in melt-blended poly(hydroxybutyrate-co-hydroxyvalerate)/clay nanocomposites: Morphology, thermal stability, and mechanical properties. J Appl Polym Sci 2015. [DOI: 10.1002/app.42390] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | - José Gámez-Pérez
- Polymer and Advanced Materials Group (PIMA); Universidad Jaume I; 12071 Castellon Spain
| | - Luis Cabedo
- Polymer and Advanced Materials Group (PIMA); Universidad Jaume I; 12071 Castellon Spain
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16
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Ree M. Probing the self-assembled nanostructures of functional polymers with synchrotron grazing incidence X-ray scattering. Macromol Rapid Commun 2014; 35:930-59. [PMID: 24706560 DOI: 10.1002/marc.201400025] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Indexed: 11/09/2022]
Abstract
For advanced functional polymers such as biopolymers, biomimic polymers, brush polymers, star polymers, dendritic polymers, and block copolymers, information about their surface structures, morphologies, and atomic structures is essential for understanding their properties and investigating their potential applications. Grazing incidence X-ray scattering (GIXS) is established for the last 15 years as the most powerful, versatile, and nondestructive tool for determining these structural details when performed with the aid of an advanced third-generation synchrotron radiation source with high flux, high energy resolution, energy tunability, and small beam size. One particular merit of this technique is that GIXS data can be obtained facilely for material specimens of any size, type, or shape. However, GIXS data analysis requires an understanding of GIXS theory and of refraction and reflection effects, and for any given material specimen, the best methods for extracting the form factor and the structure factor from the data need to be established. GIXS theory is reviewed here from the perspective of practical GIXS measurements and quantitative data analysis. In addition, schemes are discussed for the detailed analysis of GIXS data for the various self-assembled nanostructures of functional homopolymers, brush, star, and dendritic polymers, and block copolymers. Moreover, enhancements to the GIXS technique are discussed that can significantly improve its structure analysis by using the new synchrotron radiation sources such as third-generation X-ray sources with picosecond pulses and partial coherence and fourth-generation X-ray laser sources with femtosecond pulses and full coherence.
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Affiliation(s)
- Moonhor Ree
- Department of Chemistry, Division of Advanced Materials Science, Pohang Accelerator Laboratory, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science & Technology, Pohang, 790-784, Republic of Korea
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17
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Wang L, Yang MB. Unusual hierarchical distribution of β-crystals and improved mechanical properties of injection-molded bars of isotactic polypropylene. RSC Adv 2014. [DOI: 10.1039/c4ra00380b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Shish-kebab and β-cylindrite morphology were observed simultaneously in the GAIM iPP part, which showed greatly improved mechanical properties.
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Affiliation(s)
- Long Wang
- College of Polymer Science & Engineering
- The State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065, P.R. China
| | - Ming-Bo Yang
- College of Polymer Science & Engineering
- The State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065, P.R. China
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18
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Sreedevi S, Unni KN, Sajith S, Priji P, Josh MS, Benjamin S. Bioplastics: Advances in Polyhydroxybutyrate Research. ADVANCES IN POLYMER SCIENCE 2014. [DOI: 10.1007/12_2014_297] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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19
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Time-resolved synchrotron X-ray scattering studies on crystallization behaviors of poly(ethylene terephthalate) copolymers containing 1,4-cyclohexylenedimethylene units. Macromol Res 2013. [DOI: 10.1007/s13233-014-2020-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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20
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Chen J, Bi Q, Liu S, Li X, Liu Y, Zhai Y, Zhao Y, Yang L, Xu Y, Noda I, Wu J. Double Asynchronous Orthogonal Sample Design Scheme for Probing Intermolecular Interactions. J Phys Chem A 2012; 116:10904-16. [DOI: 10.1021/jp300918g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Quan Bi
- College of Pharmacy, Liaoning University of Traditional Chinese Medicine, Shenyang 11660, P. R. China
| | | | | | | | - Yanjun Zhai
- College of Pharmacy, Liaoning University of Traditional Chinese Medicine, Shenyang 11660, P. R. China
| | | | | | | | - Isao Noda
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United
States
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21
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Srubar W, Wright Z, Tsui A, Michel A, Billington S, Frank C. Characterizing the effects of ambient aging on the mechanical and physical properties of two commercially available bacterial thermoplastics. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.04.011] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Righetti MC, Lorenzo MLD. Nonlinear determination of the equilibrium melting temperature from initial nonreorganized crystals of poly(3-hydroxybutyrate). POLYM ENG SCI 2012. [DOI: 10.1002/pen.23199] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Hu D, Chung AL, Wu LP, Zhang X, Wu Q, Chen JC, Chen GQ. Biosynthesis and Characterization of Polyhydroxyalkanoate Block Copolymer P3HB-b-P4HB. Biomacromolecules 2011; 12:3166-73. [DOI: 10.1021/bm200660k] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Die Hu
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ah-Leum Chung
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Lin-Ping Wu
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Xin Zhang
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Qiong Wu
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jin-Chun Chen
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Guo-Qiang Chen
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
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24
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Kim M, Rho Y, Jin KS, Ahn B, Jung S, Kim H, Ree M. pH-dependent structures of ferritin and apoferritin in solution: disassembly and reassembly. Biomacromolecules 2011; 12:1629-40. [PMID: 21446722 DOI: 10.1021/bm200026v] [Citation(s) in RCA: 223] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The pH-dependent structures of the ferritin shell (apoferritin, 24-mer) and the ferrihydrite core, under physiological conditions that permit enzymatic activity, were investigated by synchrotron small-angle X-ray scattering (SAXS). The solution structure of apoferritin was found to be nearly identical to the crystal structure. The shell thickness and hollow core volumes were estimated. The intact hollow spherical apoferritin was stable over a wide pH range, 3.40-10.0, and the ferrihydrite core was stable over the pH range 2.10-10.0. The apoferritin subunits underwent aggregation below pH 0.80, whereas the ferrihydrite cores aggregated below pH 2.10 as a result of the disassembly of the ferritin shell under the strongly acidic conditions. As the pH decreased from 3.40 to 0.80, apoferritin underwent stepwise disassembly by first forming a hollow sphere with two holes, then a headset-shaped structure, and, finally, rodlike oligomers. As the pH was increased from pH 1.96, the disassembled rodlike oligomers recovered only to the headset-shaped structure, and the disassembled headset-shaped intermediates recovered only to the hollow spherical structure with two hole defects. The apoferritin hole defects that formed during the disassembly process did not heal as the pH was increased to neutral or slightly basic conditions. The pH-induced apoferritin disassembly and reassembly processes were not fully reversible, although they were pseudoreversible over a limited pH range, between 10.0 and 2.66.
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Affiliation(s)
- Mihee Kim
- Department of Chemistry, Division of Advanced Material Science, BK School of Molecular Science, Pohang University of Science and Technology, Pohang, Republic of Korea
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25
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Microbial production of polyhydroxyalkanoate block copolymer by recombinant Pseudomonas putida. Appl Microbiol Biotechnol 2010; 90:659-69. [PMID: 21181145 DOI: 10.1007/s00253-010-3069-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 12/07/2010] [Accepted: 12/07/2010] [Indexed: 10/18/2022]
Abstract
Polyhydroxyalkanoate (PHA) synthesis genes phaPCJ(Ac) cloned from Aeromonas caviae were transformed into Pseudomonas putida KTOY06ΔC, a mutant of P. putida KT2442, resulting in the ability of the recombinant P. putida KTOY06ΔC (phaPCJ(A.c)) to produce a short-chain-length and medium-chain-length PHA block copolymer consisting of poly-3-hydroxybutyrate (PHB) as one block and random copolymer of 3-hydroxyvalerate (3HV) and 3-hydroxyheptanoate (3HHp) as another block. The novel block polymer was studied by differential scanning calorimetry (DSC), nuclear magnetic resonance, and rheology measurements. DSC studies showed the polymer to possess two glass transition temperatures (T(g)), one melting temperature (T(m)) and one cool crystallization temperature (T(c)). Rheology studies clearly indicated a polymer chain re-arrangement in the copolymer; these studies confirmed the polymer to be a block copolymer, with over 70 mol% homopolymer (PHB) of 3-hydroxybutyrate (3HB) as one block and around 30 mol% random copolymers of 3HV and 3HHp as the second block. The block copolymer was shown to have the highest tensile strength and Young's modulus compared with a random copolymer with similar ratio and a blend of homopolymers PHB and PHVHHp with similar ratio. Compared with other commercially available PHA including PHB, PHBV, PHBHHx, and P3HB4HB, the short-chain- and medium-chain-length block copolymer PHB-b-PHVHHp showed differences in terms of mechanical properties and should draw more attentions from the PHA research community.
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Composition-dependent phase segregation and cocrystallization behaviors of blends of metallocene-catalyzed octene-LLDPE(D) and LDPE(H). POLYMER 2010. [DOI: 10.1016/j.polymer.2010.09.075] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jin KS, Shin SR, Ahn B, Jin S, Rho Y, Kim H, Kim SJ, Ree M. Effect of C(60) fullerene on the duplex formation of i-motif DNA with complementary DNA in solution. J Phys Chem B 2010; 114:4783-8. [PMID: 20218585 DOI: 10.1021/jp9122453] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural effects of fullerene on i-motif DNA were investigated by characterizing the structures of fullerene-free and fullerene-bound i-motif DNA, in the presence of cDNA and in solutions of varying pH, using circular dichroism and synchrotron small-angle X-ray scattering. To facilitate a direct structural comparison between the i-motif and duplex structures in response to pH stimulus, we developed atomic scale structural models for the duplex and i-motif DNA structures, and for the C(60)/i-motif DNA hybrid associated with the cDNA strand, assuming that the DNA strands are present in an ideal right-handed helical conformation. We found that fullerene shifted the pH-induced conformational transition between the i-motif and the duplex structure, possibly due to the hydrophobic interactions between the terminal fullerenes and between the terminal fullerenes and an internal TAA loop in the DNA strand. The hybrid structure showed a dramatic reduction in cyclic hysteresis.
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Affiliation(s)
- Kyeong Sik Jin
- Pohang Accelerator Laboratory, Department of Chemistry, National Research Lab for Polymer Synthesis and Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Division of Advanced Materials Science, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
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Jin S, Higashihara T, Jin KS, Yoon J, Rho Y, Ahn B, Kim J, Hirao A, Ree M. Synchrotron X-ray Scattering Characterization of the Molecular Structures of Star Polystyrenes with Varying Numbers of Arms. J Phys Chem B 2010; 114:6247-57. [DOI: 10.1021/jp911928b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sangwoo Jin
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Tomoya Higashihara
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Kyeong Sik Jin
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Jinhwan Yoon
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Yecheol Rho
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Byungcheol Ahn
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Jehan Kim
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Akira Hirao
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
| | - Moonhor Ree
- Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Center for Electro-Photo Behaviors in Advanced Molecular Systems, BK School of Molecular Science, Division of Advanced Materials Science, and Polymer Research Institute, Pohang University of Science & Technology (POSTECH), Pohang 790-784, Republic of Korea, Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552,
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Zhang C, Huang K, Li H, Chen J, Liu S, Zhao Y, Wang D, Xu Y, Wu J, Noda I, Ozaki Y. Double Orthogonal Sample Design Scheme and Corresponding Basic Patterns in Two-Dimensional Correlation Spectra for Probing Subtle Spectral Variations Caused by Intermolecular Interactions. J Phys Chem A 2009; 113:12142-56. [DOI: 10.1021/jp9005185] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chengfeng Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Kun Huang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Huizhen Li
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Jing Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Shaoxuan Liu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Ying Zhao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Dujin Wang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Yizhuang Xu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Jinguang Wu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Isao Noda
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
| | - Yukihiro Ozaki
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China, Graduate School of Chinese Academy of Sciences, Beijing 100190, China, College of Chemistry and Environmental Science, Henan Normal
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Jin KS, Shin SR, Ahn B, Rho Y, Kim SJ, Ree M. pH-dependent structures of an i-motif DNA in solution. J Phys Chem B 2009; 113:1852-6. [PMID: 19173566 DOI: 10.1021/jp808186z] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have investigated for the first time the structure of i-motif DNA in solution at various pH conditions by using synchrotron small-angle X-ray scattering technique. To facilitate direct structural comparison between solution structures of i-motif DNA at various pH values, we created atomic coordinates of i-motif DNA from a fully folded to unfolded atomic model. Under mild acidic conditions, the conformations for i-motif DNA appeared to be similar to that of the partially unfolded i-motif atomic model in overall shape, rather than the fully folded i-motif atomic model. Collectively, our observations indicate that i-motif DNA molecule is structurally dynamic over a wide pH range, adopting multiple conformations ranging from the folded i-motif structure to a random coil conformation. As the i-motif structure has been used as an important component in nanomachines, we can therefore believe that the structural evidence presented herein will promote the development of future DNA-based molecular-actuator devices.
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Affiliation(s)
- Kyeong Sik Jin
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Polymer Research Institute, Republic of Korea.
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31
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Cai H, Qiu Z. Effect of comonomer content on the crystallization kinetics and morphology of biodegradable poly(3-hydroxybutyrate-co-3-hydroxyhexanoate). Phys Chem Chem Phys 2009; 11:9569-77. [DOI: 10.1039/b907677h] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Jin KS, Rho Y, Kim J, Kim H, Kim IJ, Ree M. Synchrotron Small-Angle X-ray Scattering Studies of the Structure of Porcine Pepsin under Various pH Conditions. J Phys Chem B 2008; 112:15821-7. [DOI: 10.1021/jp805940d] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kyeong Sik Jin
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
| | - Yecheol Rho
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
| | - Jehan Kim
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
| | - Heesoo Kim
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
| | - Ik Jung Kim
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
| | - Moonhor Ree
- Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea, and Department of Microbiology, Dongguk Medical Institute, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea
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33
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Yoon J, Kim KW, Kim J, Heo K, Jin KS, Jin S, Shin TJ, Lee B, Rho Y, Ahn B, Ree M. Small-angle x-ray scattering station 4C2 BL of pohang accelerator laboratory for advance in Korean polymer science. Macromol Res 2008. [DOI: 10.1007/bf03218563] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Yoon J, Jung SY, Ahn B, Heo K, Jin S, Iyoda T, Yoshida H, Ree M. Order−Order and Order−Disorder Transitions in Thin Films of an Amphiphilic Liquid Crystalline Diblock Copolymer. J Phys Chem B 2008; 112:8486-95. [DOI: 10.1021/jp803664h] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jinhwan Yoon
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Sun Young Jung
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Byungcheol Ahn
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Kyuyoung Heo
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Sangwoo Jin
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Tomokazu Iyoda
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Hirohisa Yoshida
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
| | - Moonhor Ree
- Department of Chemistry, National Research Laboratory for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, and BK school of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea, Graduate School of Environmental Science, Tokyo Metropolitan University, 1-1- Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan, CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan, and Chemical Resources Laboratory,
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