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A Practical Tool for the Assessment of Polymer Biodegradability in Marine Environments Guides the Development of Truly Biodegradable Plastics. Polymers (Basel) 2023; 15:polym15040974. [PMID: 36850256 PMCID: PMC9965661 DOI: 10.3390/polym15040974] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/06/2023] [Accepted: 02/09/2023] [Indexed: 02/18/2023] Open
Abstract
Environmental persistence is one of the few shortcomings of plastic materials. As a consequence, alternative plastics labeled as compostable are replacing polyolefins in some commercial applications, such as food bags and trash bags. A rapid, high-throughput, and environmentally relevant method to assess the potential biodegradability in marine conditions is used to assess these materials already on the market, as well as novel bio-based polymers still in development. By fitting experimental data to a non-linear logistic model, ultimate biodegradability can be calculated without regard for incubation time. Whereas the commercial products show negligible or very low marine biodegradability, one of the novel materials exceeds the 20% biodegradation threshold relative to fully marine biodegradable PHB after 28 days. In addition, the sensitivity of the method can be enhanced and its duration reduced, at the expense of labor-demanding preconditioning of the microbial inoculum, by increasing the bacterial density in the incubation vessels. In contrast, pre-exposure of the inoculum to plastic, either in laboratory or field conditions, does not enhance the performance of the test.
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López-Ibáñez S, Beiras R. Is a compostable plastic biodegradable in the sea? A rapid standard protocol to test mineralization in marine conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 831:154860. [PMID: 35351500 DOI: 10.1016/j.scitotenv.2022.154860] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/21/2022] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
Due to environmental persistence, lack of a proper land-based waste management, and global circulation, marine ecosystems are especially threatened by plastics. The search for alternatives to conventional oil-based polymers gave rise to novel materials commercialized under different "green" labels based on compostability. However, current international standards are not effective in predicting actual biodegradability of plastic objects in natural scenarios, and degradation of these novel bioplastics in marine conditions is unwarranted. We present a simple and rapid standard protocol based on their biological oxygen demand, intended to support policy-makers and plastic industry in the search for truly marine-biodegradable plastics. Improvements include: development of an environmentally relevant nutrient formulation following Redfield ratio (106C:16 N:1P); use of a natural inoculum representative of marine habitats (sediment pore water); standardization of the test material by grinding to particles below 250 μm to shorten the incubation period, and selection of a truly biodegradable biopolymer (PHB), used as positive control. This protocol was successfully applied to show that commercial compostable plastics are not biodegradable in marine environments.
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Affiliation(s)
- Sara López-Ibáñez
- Centro de Investigación Mariña, ECIMAT, Universidade de Vigo, 36331 Vigo, Galicia, Spain
| | - Ricardo Beiras
- Centro de Investigación Mariña, ECIMAT, Universidade de Vigo, 36331 Vigo, Galicia, Spain; Universidade de Vigo, Facultade de Ciencias do Mar, 36310 Vigo, Galicia, Spain.
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Ansari S, Sami N, Yasin D, Ahmad N, Fatma T. Biomedical applications of environmental friendly poly-hydroxyalkanoates. Int J Biol Macromol 2021; 183:549-563. [PMID: 33932421 DOI: 10.1016/j.ijbiomac.2021.04.171] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 04/26/2021] [Accepted: 04/26/2021] [Indexed: 02/06/2023]
Abstract
Biological polyesters of hydroxyacids are known as polyhydroxyalkanoates (PHA). They have proved to be an alternative, environmentally friendly and attractive candidate for the replacement of petroleum-based plastics in many applications. Many bacteria synthesize these compounds as an intracellular carbon and energy compound usually under unbalanced growth conditions. Biodegradability and biocompatibility of different PHA has been studied in cell culture systems or in an animal host during the last few decades. Such investigations have proposed that PHA can be used as biomaterials for applications in conventional medical devices such as sutures, patches, meshes, implants, and tissue engineering scaffolds as well. Moreover, findings related to encapsulation capability and degradation kinetics of some PHA polymers has paved their way for development of controlled drug delivery systems. The present review discusses about bio-plastics, their characteristics, examines the key findings and recent advances highlighting the usage of bio-plastics in different medical devices. The patents concerning to PHA application in biomedical field have been also enlisted that will provide a brief overview of the status of research in bio-plastic. This would help medical researchers and practitioners to replace the synthetic plastics aids that are currently being used. Simultaneously, it could also prove to be a strong step in reducing the plastic pollution that surged abruptly due to the COVID-19 medical waste.
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Affiliation(s)
- Sabbir Ansari
- Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi 110025, India
| | - Neha Sami
- Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi 110025, India
| | - Durdana Yasin
- Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi 110025, India
| | - Nazia Ahmad
- Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi 110025, India
| | - Tasneem Fatma
- Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi 110025, India.
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Lopera-Valle A, Caputo JV, Leão R, Sauvageau D, Luz SM, Elias A. Influence of Epoxidized Canola Oil (eCO) and Cellulose Nanocrystals (CNCs) on the Mechanical and Thermal Properties of Polyhydroxybutyrate (PHB)-Poly(lactic acid) (PLA) Blends. Polymers (Basel) 2019; 11:E933. [PMID: 31146438 PMCID: PMC6631437 DOI: 10.3390/polym11060933] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 05/25/2019] [Accepted: 05/27/2019] [Indexed: 11/16/2022] Open
Abstract
Two major obstacles to utilizing polyhydroxybutyrate (PHB)-a biodegradable and biocompatible polymer-in commercial applications are its low tensile yield strength (<10 MPa) and elongation at break (~5%). In this work, we investigated the modification of the mechanical properties of PHB through the use of a variety of bio-derived additives. Poly(lactic acid) (PLA) and sugarcane-sourced cellulose nanocrystals (CNCs) were proposed as mechanical reinforcing elements, and epoxidized canola oil (eCO) was utilized as a green plasticizer. Zinc acetate was added to PHB and PLA blends in order to improve blending. Composites were mixed in a micro-extruder, and the resulting filaments were molded into 2-mm sheets utilizing a hot-press prior to characterization. The inclusion of the various additives was found to influence the crystallization process of PHB without affecting thermal stability. In general, the addition of PLA and, to a lesser degree, CNCs, resulted in an increase in the Young's modulus of the material, while the addition of eCO improved the strain at break. Overall, samples containing eCO and PLA (at concentrations of 10 wt %, and 25 wt %, respectively) demonstrated the best mechanical properties in terms of Young's modulus, tensile strength and strain at break.
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Affiliation(s)
- Adrián Lopera-Valle
- Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Joseph V Caputo
- Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Rosineide Leão
- Department of Automotive Engineering, University of Brasília, Faculdade do Gama, Brasília-DF 72444-240, Brazil.
| | - Dominic Sauvageau
- Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Sandra Maria Luz
- Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
- Department of Automotive Engineering, University of Brasília, Faculdade do Gama, Brasília-DF 72444-240, Brazil.
| | - Anastasia Elias
- Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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Elmowafy E, Abdal-Hay A, Skouras A, Tiboni M, Casettari L, Guarino V. Polyhydroxyalkanoate (PHA): applications in drug delivery and tissue engineering. Expert Rev Med Devices 2019; 16:467-482. [PMID: 31058550 DOI: 10.1080/17434440.2019.1615439] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The applications of naturally obtained polymers are tremendously increased due to them being biocompatible, biodegradable, environmentally friendly and renewable in nature. Among them, polyhydroxyalkanoates are widely studied and they can be utilized in many areas of human life research such as drug delivery, tissue engineering, and other medical applications. AREAS COVERED This review provides an overview of the polyhydroxyalkanoates biosynthesis and their possible applications in drug delivery in the range of micro- and nano-size. Moreover, the possible applications in tissue engineering are covered considering macro- and microporous scaffolds and extracellular matrix analogs. EXPERT COMMENTARY The majority of synthetic plastics are non-biodegradable so, in the last years, a renewed interest is growing to develop alternative processes to produce biologically derived polymers. Among them, PHAs present good properties such as high immunotolerance, low toxicity, biodegradability, so, they are promisingly using as biomaterials in biomedical applications.
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Affiliation(s)
- Enas Elmowafy
- a Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy , Ain Shams University , Cairo , Egypt
| | - Abdalla Abdal-Hay
- b Dentistry and Oral Health School , The University of Queensland , Qld , Australia
| | - Athanasios Skouras
- c Department of Biomolecular Sciences , University of Urbino , Urbino (PU) , Italy.,d Department of Life Sciences , School of Sciences, European University Cyprus , Nicosia , Cyprus
| | - Mattia Tiboni
- c Department of Biomolecular Sciences , University of Urbino , Urbino (PU) , Italy
| | - Luca Casettari
- c Department of Biomolecular Sciences , University of Urbino , Urbino (PU) , Italy
| | - Vincenzo Guarino
- e Institute of Polymers, composites and Biomaterials , National Research Council of Italy , Naples , Italy
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Adeyeye OA, Sadiku ER, Babu Reddy A, Ndamase AS, Makgatho G, Sellamuthu PS, Perumal AB, Nambiar RB, Fasiku VO, Ibrahim ID, Agboola O, Kupolati WK, Daramola OO, Machane MJ, Jamiru T. The Use of Biopolymers in Food Packaging. MATERIALS HORIZONS: FROM NATURE TO NANOMATERIALS 2019. [DOI: 10.1007/978-981-13-8063-1_6] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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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.
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Affiliation(s)
- Preetam Anbukarasu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada.
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Bayón B, Berti IR, Gagneten AM, Castro GR. Biopolymers from Wastes to High-Value Products in Biomedicine. ENERGY, ENVIRONMENT, AND SUSTAINABILITY 2018. [DOI: 10.1007/978-981-10-7431-8_1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Flanagan JCA, Myung J, Criddle CS, Waymouth RM. Poly(hydroxyalkanoate)s from Waste Biomass: A Combined Chemical-Biological Approach. ChemistrySelect 2016. [DOI: 10.1002/slct.201600592] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
| | - Jaewook Myung
- Department of Civil and Environmental Engineering; Stanford University; Stanford, CA 94305 USA
| | - Craig S. Criddle
- Department of Civil and Environmental Engineering; Stanford University; Stanford, CA 94305 USA
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Effects of crystallization temperature and spherulite size on cracking behavior of semi-crystalline polymers. Polym Bull (Berl) 2016. [DOI: 10.1007/s00289-016-1634-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Strong PJ, Laycock B, Mahamud SNS, Jensen PD, Lant PA, Tyson G, Pratt S. The Opportunity for High-Performance Biomaterials from Methane. Microorganisms 2016; 4:E11. [PMID: 27681905 PMCID: PMC5029516 DOI: 10.3390/microorganisms4010011] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 01/15/2016] [Accepted: 01/22/2016] [Indexed: 01/18/2023] Open
Abstract
Polyhydroxyalkanoate (PHA) biopolymers are widely recognised as outstanding candidates to replace conventional petroleum-derived polymers. Their mechanical properties are good and can be tailored through copolymer composition, they are biodegradable, and unlike many alternatives, they do not rely on oil-based feedstocks. Further, they are the only commodity polymer that can be synthesised intracellularly, ensuring stereoregularity and high molecular weight. However, despite offering enormous potential for many years, they are still not making a significant impact. This is broadly because commercial uptake has been limited by variable performance (inconsistent polymer properties) and high production costs of the raw polymer. Additionally, the main type of PHA produced naturally is poly-3-hydroxybutyrate (PHB), which has limited scope due to its brittle nature and low thermal stability, as well as its tendency to embrittle over time. Production cost is strongly impacted by the type of the feedstock used. In this article we consider: the production of PHAs from methanotrophs using methane as a cost-effective substrate; the use of mixed cultures, as opposed to pure strains; and strategies to generate a poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer (PHBV), which has more desirable qualities such as toughness and elasticity.
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Affiliation(s)
- Peter James Strong
- Centre for Solid Waste Bioprocessing, School of Civil Engineering and School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Bronwyn Laycock
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia.
| | | | - Paul Douglas Jensen
- Advanced Water Management Centre, The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Paul Andrew Lant
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia.
| | - Gene Tyson
- Australian Centre for Ecogenomics, The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Steven Pratt
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia.
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Tuning the properties of polyhydroxybutyrate films using acetic acid via solvent casting. Sci Rep 2015; 5:17884. [PMID: 26640089 PMCID: PMC4671097 DOI: 10.1038/srep17884] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 11/09/2015] [Indexed: 11/29/2022] Open
Abstract
Biodegradable polyhydroxybutyrate (PHB) films were fabricated using acetic acid as an alternative to common solvents such as chloroform. The PHB films were prepared using a solvent casting process at temperatures ranging from 80 °C to 160 °C. The crystallinity, mechanical properties and surface morphology of the films cast at different temperatures were characterized and compared to PHB films cast using chloroform as a solvent. Results revealed that the properties of the PHB film varied considerably with solvent casting temperature. In general, samples processed with acetic acid at low temperatures had comparable mechanical properties to PHB cast using chloroform. This acetic acid based method is environmentally friendly, cost efficient and allows more flexible processing conditions and broader ranges of polymer properties than traditional methods.
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Hazer DB, Bal E, Nurlu G, Benli K, Balci S, Öztürk F, Hazer B. In vivo application of poly-3-hydroxyoctanoate as peripheral nerve graft. J Zhejiang Univ Sci B 2014; 14:993-1003. [PMID: 24190445 DOI: 10.1631/jzus.b1300016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE This study aims to investigate the degree of biocompatibility and neuroregeneration of a polymer tube, poly-3-hydroxyoctanoate (PHO) in nerve gap repair. METHODS Forty Wistar Albino male rats were randomized into two groups: autologous nerve gap repair group and PHO tube repair group. In each group, a 10-mm right sciatic nerve defect was created and reconstructed accordingly. Neuroregeneration was studied by sciatic function index (SFI), electromyography, and immunohistochemical studies on Days 7, 21, 45 and 60 of implantation. Biocompatibility was analyzed by the capsule formation around the conduit. Biodegradation was analyzed by the molecular weight loss in vivo. RESULTS Electrophysiological and histomorphometric assessments demonstrated neuroregeneration in both groups over time. In the experimental group, a straight alignment of the Schwann cells parallel to the axons was detected. However, autologous nerve graft seems to have a superior neuroregeneration compared to PHO grafts. Minor biodegradation was observed in PHO conduit at the end of 60 d. CONCLUSIONS Although neuroregeneration is detected in PHO grafts with minor degradation in 60 d, autologous nerve graft is found to be superior in axonal regeneration compared to PHO nerve tube grafts. PHO conduits were found to create minor inflammatory reaction in vivo, resulting in good soft tissue response.
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Affiliation(s)
- D Burcu Hazer
- Department of Neurosurgery, Faculty of Medicine, Muğla Sıtkı Koçman University, Muğla 48000, Turkey; Atatürk Research and Medical Center, Neurosurgery Clinic, Ministry of Health of the Republic of Turkey, Ankara 06110, Turkey; Department of Neurology, Faculty of Medicine, School of Medicine, Hacettepe University, Ankara 06100, Turkey; Department of Neurosurgery, Faculty of Medicine, School of Medicine, Hacettepe University, Ankara 06100, Turkey; Atatürk Research and Medical Center, Department of Pathology, Yıldırım Beyazıt University, Ankara 06110, Turkey; Department of Histology and Embryology, Faculty of Medicine, Muğla Sıtkı Koçman University, Muğla 48000, Turkey; Department of Chemistry, Bülent Ecevit University, Zonguldak 67100, Turkey
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Sójka-Ledakowicz J, Łatwińska M, Kudzin M, Klepacz-Smółka A. A study on obtaining nonwovens using polyhydroxyalkanoates and the melt-blown technique. E-POLYMERS 2014. [DOI: 10.1515/epoly-2014-0089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractPoly(3-hydroxybutyrate) [P(3HB)] nonwovens were obtained from polymers enriched with nucleants using the melt-blown technique. The most important physico-mechanical parameters, susceptibility to hydrolytic degradation (in neutral and alkaline medium) and to biodegradation, were analysed for the obtained nonwovens. It was determined that P(3HB) nonwovens, compared to popular polypropylene (PP) nonwovens, are characterized by elementary fibres with several times greater average diameter, greater mass per unit area and greater air permeability value. P(3HB) nonwovens are, on average, seven times more susceptible to breakage, and their elongation at maximum force is more than 50 times smaller than that for PP nonwovens. Hydrolysis of P(3HB) nonwovens is faster in an alkaline than in a neutral medium, and the observed relationships led to the conclusion that, at the start, short chains are subject to hydrolysis. Analysis of the weight loss associated with the degradation in bioreactors showed that P(3HB) nonwovens are more susceptible to biodegradation under anaerobic than under aerobic conditions.
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Affiliation(s)
| | - Marta Łatwińska
- 1Instytut Włókiennictwa (Textile Research Institute), ul. Brzezińska 5/15, 92-103 Łódź, Poland
| | - Marcin Kudzin
- 1Instytut Włókiennictwa (Textile Research Institute), ul. Brzezińska 5/15, 92-103 Łódź, Poland
| | - Anna Klepacz-Smółka
- 2Politechnika Łódzka, Wydział Inżynierii Procesowej i Ochrony Środowiska (Lodz University of Technology, Faculty of Process and Environmental Engineering), ul. Wólczańska 213, 90-924 Łódź, Poland
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Laycock B, Halley P, Pratt S, Werker A, Lant P. The chemomechanical properties of microbial polyhydroxyalkanoates. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2013.06.008] [Citation(s) in RCA: 137] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Vijayendra SVN, Shamala TR. Film forming microbial biopolymers for commercial applications—A review. Crit Rev Biotechnol 2013; 34:338-57. [DOI: 10.3109/07388551.2013.798254] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Advances in the applications of polyhydroxyalkanoate nanoparticles for novel drug delivery system. BIOMED RESEARCH INTERNATIONAL 2013; 2013:581684. [PMID: 23984383 PMCID: PMC3741897 DOI: 10.1155/2013/581684] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2013] [Accepted: 06/09/2013] [Indexed: 12/16/2022]
Abstract
Drug delivery technology is emerging as an interdisciplinary science aimed at improving human health. The controlled delivery of pharmacologically active agents to the specific site of action at the therapeutically optimal rate and dose regimen has been a major goal in designing drug delivery systems. Over the past few decades, there has been considerable interest in developing biodegradable drug carriers as effective drug delivery systems. Polymeric materials from natural sources play an important role in controlled release of drug at a particular site. Polyhydroxyalkanoates, due to their origin from natural sources, are given attention as candidates for drug delivery materials. Biodegradable and biocompatible polyhydroxyalkanoates are linear polyesters produced by microorganisms under unbalanced growth conditions, which have emerged as potential polymers for use as biomedical materials for drug delivery due to their unique physiochemical and mechanical properties. This review summarizes many of the key findings in the applications of polyhydroxyalkanoates and polyhydroxyalkanoate nanoparticles for drug delivery system.
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Laycock B, Halley P, Pratt S, Werker A, Lant P. The chemomechanical properties of microbial polyhydroxyalkanoates. Prog Polym Sci 2013. [DOI: 10.1016/j.progpolymsci.2012.06.003] [Citation(s) in RCA: 197] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gözke G, Prechtl C, Kirschhöfer F, Mothes G, Ondruschka J, Brenner-Weiss G, Obst U, Posten C. Electrofiltration as a purification strategy for microbial poly-(3-hydroxybutyrate). BIORESOURCE TECHNOLOGY 2012; 123:272-278. [PMID: 22940329 DOI: 10.1016/j.biortech.2012.07.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 06/02/2012] [Accepted: 07/13/2012] [Indexed: 06/01/2023]
Abstract
The biodegradable polyester poly-(3-hydroxybutyrate) (PHB), produced by Ralstonia eutropha in batch and fed-batch processes, was purified by electrofiltration. The protein film on PHB granules determines their high negative zeta potential, enabling the application of electrofiltration as an integrated technology in the downstream processing of PHB. In order to determine the optimal purification parameters, various pressure and electric field strength conditions were tested. Electrofiltration of PHB at 4bars and 4V/mm provided an up to four times higher concentration factor than conventional filtration. FT-Raman spectroscopy demonstrated that electrofiltration did not result in structural changes to the products. The study demonstrates the efficiency and practical advantages of electrofiltration as a promising downstream step in the PHB production technology.
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Affiliation(s)
- Gözde Gözke
- Institute of Process Engineering in Life Sciences, Bioprocess Engineering, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, Build. 30.44, D-76131 Karlsruhe, Germany.
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Nitschke M, Costa SG, Contiero J. Rhamnolipids and PHAs: Recent reports on Pseudomonas-derived molecules of increasing industrial interest. Process Biochem 2011. [DOI: 10.1016/j.procbio.2010.12.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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The effect of gold clusters on the autoxidation of poly(3-hydroxy 10-undecenoate-co-3-hydroxy octanoate) and tissue response evaluation. JOURNAL OF POLYMER RESEARCH 2010. [DOI: 10.1007/s10965-010-9413-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Amphiphilic Poly(3-hydroxy alkanoate)s: Potential Candidates for Medical Applications. INT J POLYM SCI 2010. [DOI: 10.1155/2010/423460] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Poly(3-hydroxy alkanoate)s, PHAs, have been very attractive as biomaterials due to their biodegradability and biocompatibility. These hydrophobic natural polyesters, PHAs, need to have hydrophilic character particularly for drug delivery systems. In this manner, poly(ethylene glycol) (PEG) and hydrophilic functional groups such as amine, hydroxyl, carboxyl, and sulfonic acid have been introduced into the PHAs in order to obtain amphiphilic polymers. This review involves in the synthesis and characterization of the amphiphilic PHAs.
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Synthesis of microbial elastomers based on soybean oil. Autoxidation kinetics, thermal and mechanical properties. JOURNAL OF POLYMER RESEARCH 2009. [DOI: 10.1007/s10965-009-9345-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hazer DB, Hazer B, Kaymaz F. Synthesis of microbial elastomers based on soybean oily acids. Biocompatibility studies. Biomed Mater 2009; 4:035011. [PMID: 19498224 DOI: 10.1088/1748-6041/4/3/035011] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biocompatibility studies of the autoxidized and unoxidized unsaturated medium-long chain length (m-lcl) co-poly-3-hydroxyalkanoates (m-lclPHAs) derived from soya oily acids have been reported. Pseudomonas oleovorans was grown on a series of mixtures of octanoic acid (OA) and soya oily acids (Sy) with weight ratios of 20:80, 28:72 and 50:50 in order to obtain unsaturated m-lcl copolyesters coded PHO-Sy-2080, PHO-Sy-2872 and PHO-Sy-5050, respectively. The PHA films were obtained by solvent cast from CHCl(3). They were all originally sticky and waxy except PHO-Sy-5050. Autoxidation of the unsaturated copolyester films was carried out on exposure to air at room temperature in order to obtain crosslinked polymers. They became a highly flexible elastomer after being autoxidized (about 40 days of autoxidation). The in vivo tissue reactions of the autoxidized PHAs were evaluated by subcutaneous implantation in rats. The rats appeared to be healthy throughout the implantation period. No symptom such as necrosis, abscess or tumorigenesis was observed in the vicinity of the implants. Retrieved materials varied in their physical appearance after 6 weeks of implantation. In vivo biocompatibility studies of the medical applications indicated that the microbial copolyesters obtained were all biocompatible and especially the PHOSy series of copolyesters had the highest biocompatibility among them.
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Affiliation(s)
- Derya Burcu Hazer
- Department of Neurosurgery, Faculty of Medicine, School of Medicine, Hacettepe University, Sihhiye, 06100 Ankara, Turkey.
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Chen GQ. A microbial polyhydroxyalkanoates (PHA) based bio- and materials industry. Chem Soc Rev 2009; 38:2434-46. [PMID: 19623359 DOI: 10.1039/b812677c] [Citation(s) in RCA: 724] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Biopolyesters polyhydroxyalkanoates (PHA) produced by many bacteria have been investigated by microbiologists, molecular biologists, biochemists, chemical engineers, chemists, polymer experts and medical researchers. PHA applications as bioplastics, fine chemicals, implant biomaterials, medicines and biofuels have been developed and are covered in this critical review. Companies have been established or involved in PHA related R&D as well as large scale production. Recently, bacterial PHA synthesis has been found to be useful for improving robustness of industrial microorganisms and regulating bacterial metabolism, leading to yield improvement on some fermentation products. In addition, amphiphilic proteins related to PHA synthesis including PhaP, PhaZ or PhaC have been found to be useful for achieving protein purification and even specific drug targeting. It has become clear that PHA and its related technologies are forming an industrial value chain ranging from fermentation, materials, energy to medical fields (142 references).
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Affiliation(s)
- Guo-Qiang Chen
- Dept Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.
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