1
|
Qazi RA, Khattak R, Ali Shah L, Ullah R, Khan MS, Sadiq M, Hessien MM, El-Bahy ZM. Effect of MWCNTs Functionalization on Thermal, Electrical, and Ammonia-Sensing Properties of MWCNTs/PMMA and PHB/MWCNTs/PMMA Thin Films Nanocomposites. NANOMATERIALS 2021; 11:nano11102625. [PMID: 34685066 PMCID: PMC8539491 DOI: 10.3390/nano11102625] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 12/18/2022]
Abstract
Partially biodegradable polymer nanocomposites Poly(3-Hydroxybutyrate) (PHB)/MultiwalledCarbon Nanotubes (MWCNTs)/Poly(Methyl Methacrylate) (PMMA)and non-biodegradable nanocomposites (MWCNTs/PMMA) were synthesized, and their thermal, electrical, and ammonia-sensing properties were compared. MWCNTs were chemically modified to ensure effective dispersion in the polymeric matrix. Pristine MWCNTs (p-MWCNTs) were functionalized with –COOH (a-MWCNTs) and amine groups (f-MWCNTs). Then, PHB grafted multiwalled carbon nanotubes (g-MWNTs) were prepared by a ‘grafting to’ technique. The p-MWCNTs, a-MWCNTs, f-MWCNTs, and g-MWCNTs were incorporated into the PMMA matrix and PMMA/PHB blend system by solution mixing. The PHB/f-MWCNTs/PMMA blend system showed good thermal properties among all synthesized nanocomposites. Results from TGA and dTGA analysis for PHB/f-MWCNTs/PMMA showed delay in T5 (about 127 °C), T50 (up to 126 °C), and Tmax (up to 65 °C) as compared to neat PMMA. Higher values of frequency capacitance were observed in nanocomposites containing f-MWCNTs and g-MWCNTs as compared to nanocomposites containing p-MWCNTs and a-MWCNTs. This may be attributed to their excellent interaction and good dispersion in the polymeric blend. Analysis of ammonia gas-sensing data showed that PHB/g-MWCNTs/PMMA nanocomposites exhibited good sensitivity (≈100%) and excellent repeatability with a constant response. The calculated limit of detection (LOD) is 0.129 ppm for PHB/g-MWCNTs/PMMA, while that of all other nanocomposites is above 40 ppm.
Collapse
Affiliation(s)
- Raina Aman Qazi
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
- Correspondence: (R.A.Q.); (R.K.)
| | - Rozina Khattak
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
- Correspondence: (R.A.Q.); (R.K.)
| | - Luqman Ali Shah
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
| | - Rizwan Ullah
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
| | | | - Muhammad Sadiq
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;
| | - Mahmoud M. Hessien
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
| | - Zeinhom M. El-Bahy
- Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt;
| |
Collapse
|
2
|
The effect of natural fillers on the marine biodegradation behaviour of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). Sci Rep 2021; 11:911. [PMID: 33441581 PMCID: PMC7806601 DOI: 10.1038/s41598-020-78122-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 10/12/2020] [Indexed: 12/04/2022] Open
Abstract
Worldwide, improper disposal of plastics is instigating environmental initiatives to combat plastics accumulation of in the environment and the world’s oceans. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) biocomposites with Miscanthus (Misc) fibres and distillers’ dried grains with solubles (DDGS) were studied to ascertain if natural fibres and proteinaceous fillers can improve polyhydroxyalkanoate marine biodegradability. Using ASTM standard D7991-15, the biodegradation of PHBV, PHBV with Misc (15 and 25 wt%) and PHBV with DDGS (15 and 25 wt%) was performed in a simulated marine environment for the first time, as indicated by a literature survey. PHBV/Misc (85/15) and (75/25) biocomposites showed 15 and 25% more biodegradation compared to PHBV, respectively. Proteinaceous PHBV/DDGS (85/15) and (75/25) biocomposites showed 17 and 40% more biodegradation compared to PHBV, respectively. Furthermore, PHBV/Misc (75/25) and PHBV/DDGS (75/25) biocomposites were marine biodegraded in 412 and 295 days, respectively. In conclusion, proteinaceous fillers (DDGS) biocomposites have better marine biodegradability than miscanthus.
Collapse
|
3
|
Casey KC, Appiah JK, Robinson JR. Low-Symmetry β-Diketimine Aryloxide Rare-Earth Complexes: Flexible, Reactive, and Selective. Inorg Chem 2020; 59:14827-14837. [PMID: 32986427 DOI: 10.1021/acs.inorgchem.0c02170] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We report the synthesis, characterization, and reactivity of a new low-symmetry β-diketimine featuring a pendant amino(methyl)phenol donor and its corresponding heteroleptic rare-earth (RE) complexes. This includes the first structurally characterized examples of alcoholysis and insertion from an isolated REIII amide in a β-diketimine framework. The flexible methylene linkage leads to REIII complexes with tunable dynamic solution behavior that defines their stoichiometric and catalytic reactivity. The addition of a strong neutral donor ligand, tricyclohexylphosphine oxide, suppresses a prevalent catalyst degradation pathway (base-promoted elimination) and dramatically enhances the catalyst performance in the stereospecific ring-opening polymerization of rac-β-butyrolactone. Our results further demonstrate the importance of ligand reorganization in the stoichiometric and catalytic activity of REIII ions.
Collapse
Affiliation(s)
- Kerry C Casey
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| | - Jude K Appiah
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| | - Jerome R Robinson
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| |
Collapse
|
4
|
Dong X, Robinson JR. The role of neutral donor ligands in the isoselective ring-opening polymerization of rac-β-butyrolactone. Chem Sci 2020; 11:8184-8195. [PMID: 34123089 PMCID: PMC8163396 DOI: 10.1039/d0sc03507f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Isoenriched poly-3-hydroxybutyrate (P3HB) is a biodegradable material with properties similar to isotactic polypropylene, yet efficient routes to this material are lacking after 50+ years of extensive efforts in catalyst design. In this contribution, a novel lanthanum aminobisphenolate catalyst (1-La) can access isoenriched P3HB through the stereospecific ring-opening polymerization (ROP) of rac-β-butyrolactone (rac-BBL). Replacing the tethered donor group of a privileged supporting ligand with a non-coordinating benzyl substituent generates a catalyst whose reactivity and selectivity can be tuned with inexpensive achiral neutral donor ligands (e.g. phosphine oxides, OPR3). The 1-La/OPR3 (R = n-octyl, Ph) systems display high activity and are the most isoselective homogeneous catalysts for the ROP of rac-BBL to date (0 °C: Pm = 0.8, TOF ∼190 h−1). Combined reactivity and spectroscopic studies provide insight into the active catalyst structure and ROP mechanism. Both 1-La(TPPO)2 and a structurally related catalyst with a tethered donor group (2-Y) operate under chain-end stereocontrol; however, 2-RE favors formation of P3HB with opposite tacticity (syndioenriched) and its ROP activity and selectivity are totally unaffected by added neutral donor ligands. Our studies uncover new roles for neutral donor ligands in stereospecific ROP, including suppression of chain-scission events, and point to new opportunities for catalyst design. Simple achiral neutral donor ligands modify catalyst structure and function to enable access to isoenriched poly-3-hydroxybutyrate, a biodegradable material with properties similar to isotactic polypropylene.![]()
Collapse
Affiliation(s)
- Xiang Dong
- Department of Chemistry, Brown University 324 Brook St. Providence RI 02912 USA
| | - Jerome R Robinson
- Department of Chemistry, Brown University 324 Brook St. Providence RI 02912 USA
| |
Collapse
|
5
|
Anbukarasu P, Sauvageau D, Elias AL. Enzymatic degradation of dimensionally constrained polyhydroxybutyrate films. Phys Chem Chem Phys 2018; 19:30021-30030. [PMID: 29094122 DOI: 10.1039/c7cp05133f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The effect of dimensional constraint, imparted by a variation in film thickness, on the enzymatic degradation of polyhydroxybutyrate (PHB) is reported. The characterization of the crystalline structure and the surface topography of solvent-cast PHB thin films revealed strong correlations between film thickness and both crystallinity and crystal anisotropy, with the polymer film becoming more amorphous with decreasing thickness. The enzymatic degradation of the PHB films was characterized using a high precision diffraction metrology, which enabled the visualization of small variations in the degradation behavior. The results show that the degradation rate increases with decreasing thickness due to the corresponding decrease in crystallinity. However, in a nanoscopic ultra-thin PHB specimen, produced by μ-transfer molding, enzymatic degradation was impeded. The enzymatic degradation rate of the PHB films therefore was found to exhibit a discontinuous trend with respect to film thickness: initially increasing as film thickness was reduced, and then decreasing dramatically once the thickness was reduced to tens of nanometers. In this regime, enzymatic degradation was hindered by the absence of crystalline regions in the films. These results show that a nano-dimensional constraint on PHB films can result in specimens with a tunable response to extracellular enzymes.
Collapse
Affiliation(s)
- Preetam Anbukarasu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada.
| | | | | |
Collapse
|
6
|
Hou C, Sun X, Ren Z, Li H, Yan S. Polymorphism and Enzymatic Degradation of Poly(1,4-butylene adipate) and Its Binary Blends with Atactic Poly(3-hydroxybutyrate) and Poly(vinyl phenol). Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b03706] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chunyue Hou
- State Key Laboratory of Chemical Resource
Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xiaoli Sun
- State Key Laboratory of Chemical Resource
Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhongjie Ren
- State Key Laboratory of Chemical Resource
Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Huihui Li
- State Key Laboratory of Chemical Resource
Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Shouke Yan
- State Key Laboratory of Chemical Resource
Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| |
Collapse
|
7
|
Tan LC, Zhou WH, Huang YL, Chen YW. Sequential Structure, Crystallization, and Properties of Biodegradable Poly(ethylene Terephthalate-Co-Ethylene Oxide-Co-Lactide) Copolyester. J MACROMOL SCI B 2014. [DOI: 10.1080/00222348.2014.901870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
8
|
Synthesis, physical properties and enzymatic degradation of poly (oxyethylene-b-butylene succinate) ionomers. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.04.065] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
9
|
Jacquel N, Tajima K, Nakamura N, Kawachi H, Pan P, Inoue Y. Nucleation mechanism of polyhydroxybutyrate and poly(hydroxybutyrate-co-hydroxyhexanoate) crystallized by orotic acid as a nucleating agent. J Appl Polym Sci 2010. [DOI: 10.1002/app.30873] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
10
|
Kowalczuk MM. Anionic ring-opening polymerization for synthetic analogues of aliphatic biopolyesters. POLYMER SCIENCE SERIES A 2009. [DOI: 10.1134/s0965545x09110078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Jacquel N, Tajima K, Nakamura N, Miyagawa T, Pan P, Inoue Y. Effect of orotic acid as a nucleating agent on the crystallization of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymers. J Appl Polym Sci 2009. [DOI: 10.1002/app.30587] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
12
|
Kikkawa Y, Suzuki T, Kanesato M, Doi Y, Abe H. Effect of Phase Structure on Enzymatic Degradation in Poly(l-lactide)/Atactic Poly(3-hydroxybutyrate) Blends with Different Miscibility. Biomacromolecules 2009; 10:1013-8. [DOI: 10.1021/bm900117j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshihiro Kikkawa
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan, Chemical Analysis Team, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan, and Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
| | - Takayuki Suzuki
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan, Chemical Analysis Team, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan, and Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
| | - Masatoshi Kanesato
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan, Chemical Analysis Team, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan, and Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
| | - Yoshiharu Doi
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan, Chemical Analysis Team, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan, and Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
| | - Hideki Abe
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan, Chemical Analysis Team, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan, and Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
| |
Collapse
|
13
|
Zhu B, Kai W, Pan P, Yazawa K, Nishida H, Sakurai M, Inoue Y. Polymorphic Packing and Dynamics of Biodegradable Poly(3-hydroxypropionate). J Phys Chem B 2008; 112:9684-92. [DOI: 10.1021/jp801538p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bo Zhu
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Weihua Kai
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Pengju Pan
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Koji Yazawa
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Haruo Nishida
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Minoru Sakurai
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| | - Yoshio Inoue
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan, Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midori-ku, Yokohama 226-8501, Japan, and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan
| |
Collapse
|
14
|
Zhu B, He Y, Nishida H, Yazawa K, Ishii N, Kasuya KI, Inoue Y. Crystalline-Structure-Dependent Enzymatic Degradation of Polymorphic Poly(3-hydroxypropionate). Biomacromolecules 2008; 9:1221-8. [DOI: 10.1021/bm701220x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Zhu
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Yong He
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Haruo Nishida
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Koji Yazawa
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Nariaki Ishii
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Ken-ichi Kasuya
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Yoshio Inoue
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259−B-55, Midori-ku, Yokohama 226-8501, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan, and Department of Biological and Chemical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
| |
Collapse
|
15
|
Zhu B, He Y, Asakawa N, Nishida H, Inoue Y. A New Crystal Form Favored in Low Molecular Weight Biodegradable Poly(3-hydroxypropionate). Macromolecules 2005. [DOI: 10.1021/ma051922v] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Zhu
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259-B-55, Midori-ku, Yokohama 226-8501, Japan, and Molecular Engineering Institute, Kinki University, 11-6, Kayanomori, Iizuka, Fukuoka, 820-8555, Japan
| | - Yong He
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259-B-55, Midori-ku, Yokohama 226-8501, Japan, and Molecular Engineering Institute, Kinki University, 11-6, Kayanomori, Iizuka, Fukuoka, 820-8555, Japan
| | - Naoki Asakawa
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259-B-55, Midori-ku, Yokohama 226-8501, Japan, and Molecular Engineering Institute, Kinki University, 11-6, Kayanomori, Iizuka, Fukuoka, 820-8555, Japan
| | - Haruo Nishida
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259-B-55, Midori-ku, Yokohama 226-8501, Japan, and Molecular Engineering Institute, Kinki University, 11-6, Kayanomori, Iizuka, Fukuoka, 820-8555, Japan
| | - Yoshio Inoue
- Department of Biomolecular Engineering, Tokyo Institute of Technology, Nagatsuta 4259-B-55, Midori-ku, Yokohama 226-8501, Japan, and Molecular Engineering Institute, Kinki University, 11-6, Kayanomori, Iizuka, Fukuoka, 820-8555, Japan
| |
Collapse
|
16
|
Hirota Y, Yoshie N, Ishii N, Kasuya KI, Inoue Y. Correlation between Solid-State Structures and Enzymatic Degradability of Cocrystallized Blends. Macromol Biosci 2005; 5:1094-100. [PMID: 16245274 DOI: 10.1002/mabi.200500133] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Solid-state structures and enzymatic degradability have been investigated for cocrystallized blends between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHBV] and poly(3-hydroxybutyrate-co-3-hydroxypropionate) [PHBP]. From wide-angle X-ray diffraction patterns, small-angle X-ray scattering data, and the comparison of the enzymatic degradability of these blends, the solid-state structures of PHBV/PHBP blend samples, in which the PHBV component has higher isothermal crystal growth rate (G) value than the PHBP one, might be similar to those of the component PHBVs; while those of the PHBP/PHBV blend samples, in which PHBP component has higher G value, were similar to the component PHBPs. Normalized one-dimensional correlation functions gamma(x) of PHBV/PHBP binary blends crystallized at 90 degrees C.
Collapse
Affiliation(s)
- Yuuki Hirota
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan
| | | | | | | | | |
Collapse
|
17
|
Zhu B, Tanaka S, Feng L, Ishii N, Kasuya K, Doi Y, Inoue Y. Enzymatic Hydrolysis of Thioester Linkages in Bacterial Poly(3-hydroxybutyrate-co-3-mercaptopropionate)s by Poly(3-hydroxybutyrate) Depolymerase Isolated from Ralstonia pickettii T1. Polym J 2005. [DOI: 10.1295/polymj.37.711] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
18
|
Kasuya KI, Takano T, Tezuka Y, Hsieh WC, Mitomo H, Doi Y. Cloning, expression and characterization of a poly(3-hydroxybutyrate) depolymerase from Marinobacter sp. NK-1. Int J Biol Macromol 2004; 33:221-6. [PMID: 14607367 DOI: 10.1016/j.ijbiomac.2003.08.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A DNA fragment carrying the gene encoding poly(3-hydroxybutyrate) (P(3HB)) depolymerase was cloned from the genomic DNA of Marinobacter sp. DNA sequencing analysis revealed that the Marinobacter sp. P(3HB) depolymerase gene is composed of 1734bp and encodes 578 amino acids with a molecular mass of 61,757Da. A sequence homology search showed that the deduced protein contains the signal peptide, catalytic domain (CD), cadherin-type linker domain (LD), and two substrate-binding domain (SBD). The fusion proteins of glutathione S-transferase (GST) with the CD showed the hydrolytic activity for denatured P(3HB) (dP(3HB)), P(3HB) emulsion (eP(3HB)) and p-nitrophenylbutyrate. On the other hand, the fusion proteins lacking the SBD showed much lower hydrolytic activity for dP(3HB) compared to the proteins containing both CD and SBD. In addition, binding tests revealed that the SBDs are specifically bound not to eP(3HB) but dP(3HB). These suggest that the SBDs play a crucial role in the enzymatic hydrolysis of dP(3HB) that is a solid substrate.
Collapse
Affiliation(s)
- Ken-ichi Kasuya
- Material Science Laboratory, Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, 1-5-1 Tenjin, Kiryu-shi, Gunma 376-8515, Japan.
| | | | | | | | | | | |
Collapse
|
19
|
Kikkawa Y, Fujita M, Abe H, Doi Y. Effect of Water on the Surface Molecular Mobility of Poly(lactide) Thin Films: An Atomic Force Microscopy Study. Biomacromolecules 2004; 5:1187-93. [PMID: 15244429 DOI: 10.1021/bm0345007] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Physical properties associated with molecular mobility on the surface of thin films with 300 nm thickness for poly(lactide)s (PLAs) were studied under vacuum conditions as well as under aqueous conditions by using friction force mode atomic force microscopy (AFM). Two types of PLAs were applied for the experimental samples as uncrystallizable PLA (uc-PLA) and crystallizable PLA (c-PLA). The friction force on the surface of thin films was measured as a function of temperature to assess the surface molecular mobility both under vacuum and under aqueous conditions. A lower glass-transition temperature of the uc-PLA surface in water was detected than that under vacuum conditions. In the case of the c-PLA thin film, change in friction force was detected at a lower temperature under aqueous conditions than in vacuo. A morphological change was observed in the c-PLA thin film during heating process from room temperature to 100 degrees C by temperature-controlled AFM. The surface of the c-PLA thin film became rough due to the cold crystallization, and the crystallization of c-PLA molecules in water took place at a lower temperature than in vacuo. These friction force measurements and AFM observations suggest that molecular motion on the surface of the both uc- and c-PLA thin films is enhanced in the presence of water molecules. In addition, in situ AFM observation of the enzymatic degradation process for the c-PLA thin film crystallized at 160 degrees C was carried out in buffer solution containing proteinase K at room temperature. The amorphous region around the hexagonal crystal was eroded within 15 min. It has been suggested that the adsorption of water molecules on the PLA film surface enhances the surface molecular mobility of the glassy amorphous region of PLA and induces the enzymatic hydrolysis by proteinase K.
Collapse
Affiliation(s)
- Yoshihiro Kikkawa
- Polymer Chemistry Laboratory, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
| | | | | | | |
Collapse
|
20
|
Feng L, Wang Y, Inagawa Y, Kasuya K, Saito T, Doi Y, Inoue Y. Enzymatic degradation behavior of comonomer compositionally fractionated bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate)s by poly(3-hydroxyalkanoate) depolymerases isolated from Ralstonia pickettii T1 and Acidovorax sp. TP4. Polym Degrad Stab 2004. [DOI: 10.1016/j.polymdegradstab.2003.09.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
21
|
|
22
|
Na YH, He Y, Nishiwaki T, Inagawa Y, Osanai Y, Matsumura S, Saito T, Doi Y, Inoue Y. Phase-separation enhanced enzymatic degradation of atactic poly(R,S-3-hydroxybutyrate) in the blends with poly(methyl methacrylate). Polym Degrad Stab 2003. [DOI: 10.1016/s0141-3910(02)00371-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
23
|
Wang Y, Inagawa Y, Osanai Y, Kasuya KI, Saito T, Matsumura S, Doi Y, Inoue Y. Enzymatic hydrolysis of chemosynthesized atactic poly(3-hydroxybutyrate) by poly(3-hydroxyalkanoate) depolymerase from Acidovorax Sp. TP4 and Ralstonia pickettii T1. Biomacromolecules 2002; 3:894-8. [PMID: 12217032 DOI: 10.1021/bm020052b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The enzymatic degradability of chemosynthesized atactic poly([R,S]-3-hydroxybutyrate) [a-P(3HB)] by two types of extracellular poly(3-hydroxyalkanoate) (PHA) depolymerases purified from Ralstonia pickettii T1 (PhaZ(ral)) and Acidovorax Sp. TP4 (PhaZ(aci)), defined respectively as PHA depolymerase types I and II according to the position of the lipase box in the catalytic domain, were studied. The enzymatic degradation of a-P(3HB) by PhaZ(aci) depolymerase was confirmed from the results of weight loss and the scanning electron micrographs. The degradation products were characterized by one- and two-dimension (1)H NMR spectroscopy. It was found that a-P(3HB) could be degraded into monomer, dimer, and trimer by PhaZ(aci) depolymerase at temperatures ranging from 4 to 20 degrees C, while a-P(3HB) could hardly be hydrolyzed by PhaZ(ral) depolymerase in the same temperature range. These results suggested that the chemosynthesized a-P(3HB) could be degraded in the pure state by natural PHA depolymerase.
Collapse
Affiliation(s)
- Yi Wang
- Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Shuai X, Porbeni FE, Wei M, Bullions T, Tonelli AE. Formation of Inclusion Complexes of Poly(3-hydroxybutyrate)s with Cyclodextrins. 1. Immobilization of Atactic Poly(R,S-3-hydroxybutyrate) and Miscibility Enhancement between Poly(R,S-3-hydroxybutyrate) and Poly(ε-caprolactone). Macromolecules 2002. [DOI: 10.1021/ma011954s] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xintao Shuai
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, North Carolina 27695-8301
| | - Francis E. Porbeni
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, North Carolina 27695-8301
| | - Min Wei
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, North Carolina 27695-8301
| | - Todd Bullions
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, North Carolina 27695-8301
| | - Alan E. Tonelli
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, North Carolina 27695-8301
| |
Collapse
|
25
|
Shuai X, Wei M, Porbeni FE, Bullions TA, Tonelli AE. Formation of and coalescence from the inclusion complex of a biodegradable block copolymer and alpha-cyclodextrin. 2: A novel way to regulate the biodegradation behavior of biodegradable block copolymers. Biomacromolecules 2002; 3:201-7. [PMID: 11866574 DOI: 10.1021/bm015609m] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A biodegradable block copolymer (PCL-b-PLLA, M(n) = 1.72 x 10(4), M(w)/M(n) = 1.37) of poly(epsilon-caprolactone) (PCL) and poly(L-lactide) (PLLA) with very low crystallinity was obtained by forming the inclusion complex between alpha-cyclodextrin molecules and PCL-b-PLLA followed by coalescence of the guest polymer chains. Films of the as-synthesized and coalesced copolymer samples, PCL and PLLA homopolymers of approximately the same chain lengths as the corresponding blocks of PCL-b-PLLA, and a physical blend of PCL/PLLA homopolymers with the same molar composition as PCL-b-PLLA were prepared by melt-compression molding between Teflon plates. Subsequently, the in vitro biodegradation behavior of these films was studied in phosphate buffer solution containing lipase from Rhizopus arrhizus, by means of ultraviolet spectra, attenuated total reflectance FTIR spectra, differential scanning calorimetry, wide-angle X-ray diffraction measurements, and weight loss analysis. PCL segments were found to degrade much faster than PLLA segments, both in the pure state and in copolymer or blend samples. Consistent with our expectation, suppression of the phase separation, as well as a decrease of crystallinity, in the coalesced copolymer sample led to a much faster enzymatic degradation than that of either as-synthesized copolymer or the PCL/PLLA physical blend sample, especially during the early stages of biodegradation. Thus the biodegradation behavior of biodegradable block copolymers, which is of decisive importance in drug delivery and controlled release systems, may be regulated by the novel and convenient means recently reported by us.(1)
Collapse
Affiliation(s)
- Xintao Shuai
- Fiber and Polymer Science Program, College of Textiles, North Carolina State University, Raleigh, NC 27695-8301, USA
| | | | | | | | | |
Collapse
|