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Žiganova M, Merijs-Meri R, Zicāns J, Ābele A, Bochkov I, Ivanova T. Accelerated Weathering Testing (AWT) and Bacterial Biodegradation Effects on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/Rapeseed Microfiber Biocomposites Properties. Polymers (Basel) 2024; 16:622. [PMID: 38475304 DOI: 10.3390/polym16050622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 02/19/2024] [Accepted: 02/21/2024] [Indexed: 03/14/2024] Open
Abstract
In the context of sustainable materials, this study explores the effects of accelerated weathering testing and bacterial biodegradation on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/rapeseed microfiber biocomposites. Accelerated weathering, simulating outdoor environmental conditions, and bacterial biodegradation, representing natural degradation processes in soil, were employed to investigate the changes in the mechanical, thermal and morphological properties of these materials during its post-production life cycle. Attention was paid to the assessment of the change of structural, mechanical and calorimetric properties of alkali and N-methylmorpholine N-oxide (NMMO)-treated rapeseed microfiber (RS)-reinforced plasticized PHBV composites before and after accelerated weathering. Results revealed that accelerated weathering led to an increase in stiffness, but a reduction in tensile strength and elongation at break, of the investigated PHBV biocomposites. Additionally, during accelerated weathering, the crystallinity of PHBV biocomposites increased, especially in the presence of RS, due to both the hydrolytic degradation of the polymer matrix and the nucleating effect of the filler. It has been observed that an increase in PHBV crystallinity, determined by DSC measurements, correlates with the intensity ratio I1225/1180 obtained from FTIR-ATR data. The treatment of RS microfibers increased the biodegradation capability of the developed PHBV composites, especially in the case of chemically untreated RS. All the developed PHBV composites demonstrated faster biodegradation in comparison to neat PHBV matrix.
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Affiliation(s)
- Madara Žiganova
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
| | - Remo Merijs-Meri
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
| | - Jānis Zicāns
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
| | - Agnese Ābele
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
| | - Ivan Bochkov
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
| | - Tatjana Ivanova
- Institute of Chemistry and Chemistry Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 3 Paula Valdena Street, LV-1048 Riga, Latvia
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Kim SM, Lee HI, Nam SW, Jin DH, Jeong GT, Nam SW, Burns B, Jeon YJ. The Halophilic Bacterium Paracoccus haeundaensis for the Production of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate) from Single Carbon Sources. J Microbiol Biotechnol 2024; 34:74-84. [PMID: 37997264 PMCID: PMC10840474 DOI: 10.4014/jmb.2305.05025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 10/29/2023] [Accepted: 10/31/2023] [Indexed: 11/25/2023]
Abstract
The study objective was to evaluate the potential production of polyhydroxyalkanoates (PHAs), a biodegradable plastic material, by Paracoccus haeundaensis for which PHA production has never been reported. To identify the most effective nitrogen-limited culture conditions for PHAs production from this bacterium, batch fermentation using glucose concentrations ranging from 4 g l-1 to 20 g l-1 with a fixed ammonium concentration of 0.5 g l-1 was carried out at 30°C and pH 8.0. A glucose supplement of 12 g l-1 produced the highest PHA concentration (1.6 g l-1) and PHA content (0.63 g g-1) thereby identifying the optimal condition for PHA production from this bacterium. Gas chromatography-mass spectrometry analysis suggests that P. haeundaensis mostly produced copolymer types of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] from glucose concentrations at 12 g l-1 or higher under the nitrogen-limited conditions. When several other single carbon sources were evaluated for the most efficient PHA production, fructose provided the highest biomass (2.8 g l-1), and PHAs (1.29 g l-1) concentrations. Results indicated that this bacterium mostly produced the copolymers P(3HB-co-3HV) from single carbon sources composing a range of 93-98% of 3-hydroxybutyrate and 2-7% of 3-hydroxyvalerate, whereas mannose-supplemented conditions produced the only homopolymer type of P(3HB). However, when propionic acid as a secondary carbon source were supplemented into the media, P. haeundaensis produced the copolymer P(3HB-co-3HV), composed of a 50% maximum monomeric unit of 3-hydroxyvaleric acid (3HV). However, as the concentration of propionic acid increased, cell biomass and PHAs concentrations substantially decreased due to cell toxicity.
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Affiliation(s)
- Seon Min Kim
- Department of Microbiology, College of Natural Sciences, Pukyong National University, Busan 48513, Republic of Korea
- School of Marine and Fisheries Life Science, Pukyong National University, Busan 48513, Republic of Korea
| | - Hye In Lee
- Department of Microbiology, College of Natural Sciences, Pukyong National University, Busan 48513, Republic of Korea
- School of Marine and Fisheries Life Science, Pukyong National University, Busan 48513, Republic of Korea
| | - Seung Won Nam
- Bioresources Collection and Research Team, Nakdonggang National Institute of Biological Resources, Sangju 37242, Republic of Korea
| | - Deok Hyeon Jin
- Bioresources Collection and Research Team, Nakdonggang National Institute of Biological Resources, Sangju 37242, Republic of Korea
| | - Gwi-Taek Jeong
- School of Marine and Fisheries Life Science, Pukyong National University, Busan 48513, Republic of Korea
- Department of Biotechnology, Pukyong National University, Busan 48513, Republic of Korea
| | - Soo-Wan Nam
- Department of Smart Bio-Health, Dong-eui University, Busan 47340, Republic of Korea
- Biomedical Engineering and Biotechnology Major, Division of Applied Bioengineering, College of Engineering, Dong-eui University, Busan 47340, Republic of Korea
| | - Brendan Burns
- School of Biotechnology & Biomolecular Science, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Young Jae Jeon
- Department of Microbiology, College of Natural Sciences, Pukyong National University, Busan 48513, Republic of Korea
- School of Marine and Fisheries Life Science, Pukyong National University, Busan 48513, Republic of Korea
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Uğurlu N, Erdal E, Malekghasemi S, Demirbilek M. Effectiveness of carbonic anhydrase inhibitor loaded nanoparticles in the treatment of diabetic retinopathy. Biomed Phys Eng Express 2023; 10:015002. [PMID: 36758224 DOI: 10.1088/2057-1976/acba9d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 02/09/2023] [Indexed: 02/11/2023]
Abstract
Diabetic Retinopathy (DRP) is a disease consisting of all the structural and functional changes that develop in the retinal layer of the eye due to diabetes. DRP is the most important cause of blindness between the ages of 20-74 in the world, and the most successful standard treatment option in the treatment of DRP is intravitreal injections. To synthesize acetazolamide loaded nanoparticles to be applied intravitreal treatment of DRP and to examine thein vitroefficacy of the nanoparticles. ACZ loaded PHBV nanoparticles (PHBV-ACZ NPs) formulations were prepared. Nanoparticles with a particle size of 253.20 ± 0.55 nm. A DRP model was established and characterized in HRMEC cells. The effect of the nanoparticles on permeability has been investigated and carrier proteins in BRB due to the development of DRP has been investigated. To establish thein vitroDRP model, HRMEC was stimulated with Recombinant human 165 Vascular Endothelial Growth Factor (VEGF), thereby temporarily reducing the expression levels of endothelial junction proteins, increasing the number of intercellular spaces in the monolayers of HRMECs. It was determined that after the cells were exposed to Carbonic anhydrase inhibitors (CAI) loaded nanoparticles, permeability decreased and protein expression increased.
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Affiliation(s)
- Nagihan Uğurlu
- Ankara Yıldırım Beyazıt University, Faculty of Medicine, Department of Ophthalmology, Advanced Technologies Application and Research Center, Ankara, Turkey
- Ministry of Health, Ankara City Hospital, Ophthalmology Clinic, Ankara, Turkey
| | - Ebru Erdal
- Ankara Yıldırım Beyazıt University, Faculty of Medicine, Advanced Technologies Application and Research Center, Ankara, Turkey
| | - Soheil Malekghasemi
- Hacettepe University, Department of Bioengineering, Graduate School of Science and Engineering, Ankara, Turkey
| | - Murat Demirbilek
- Ankara Haci Bayram Veli University, Biology Department, Ankara, Turkey
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Alfano S, Pagnanelli F, Martinelli A. Rapid Estimation of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Composition Using ATR-FTIR. Polymers (Basel) 2023; 15:4127. [PMID: 37896375 PMCID: PMC10611011 DOI: 10.3390/polym15204127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 10/11/2023] [Accepted: 10/16/2023] [Indexed: 10/29/2023] Open
Abstract
A great research effort is involved in polyhydroxyalkanoates (PHAs) production and characterization since they are an attractive degradable polyester family that potentially could substitute oil-based polymers. This is due to two main key factors: their production is sustainable, being that they are produced by microorganisms possibly fed by organic waste-derived products, and they are degradable. Moreover, PHAs' thermal and mechanical properties could be tuned by varying their monomeric composition through the proper selection of microorganism feedstock and bioreactor operative conditions. Hence, a rapid and facile determination of the PHA chemical structure by widely available instrumentation is useful. As an alternative to the standard gas-chromatographic method, a new procedure for the composition determination of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P3HBV), the most common PHA copolymer, by attenuated total reflection FTIR (ATR-FTIR) is presented. It is based on the linear dependence of selected and normalized absorption band intensity with the molar fraction of repeating units. To break free from the crystallinity variability, which affects the result reproducibility and data scattering, the polymer sample was rapidly quenched from the melt directly on the surface of the ATR internal reflection element and analyzed. The data obtained from 14 samples with a molar fraction of 3-hydroxybutyrate repeating units (X3HB) ranging from 0.15 to 1 were analyzed. According to preliminary analyses, the normalized intensity of two absorption bands was selected to develop a calibration method able to predict X3HB of unknown samples and to evaluate the related uncertainty through prediction intervals of inverse regression. The proposed method proves to be useful for an easy and rapid estimation of P3HBV composition.
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Affiliation(s)
| | | | - Andrea Martinelli
- Department of Chemistry, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (S.A.); (F.P.)
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Frank C, Emmerstorfer-Augustin A, Rath T, Trimmel G, Nachtnebel M, Stelzer F. Bio-Polyester/Rubber Compounds: Fabrication, Characterization, and Biodegradation. Polymers (Basel) 2023; 15:2593. [PMID: 37376240 DOI: 10.3390/polym15122593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 05/23/2023] [Accepted: 05/26/2023] [Indexed: 06/29/2023] Open
Abstract
Biobased and biodegradable polymers (BBDs) such as poly(3-hydroxy-butyrate), PHB, and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) are considered attractive alternatives to fossil-based plastic materials since they are more environmentally friendly. One major problem with these compounds is their high crystallinity and brittleness. In order to generate softer materials without using fossil-based plasticizers, the suitability of natural rubber (NR) as an impact modifier was investigated in PHBV blends. Mixtures with varying proportions of NR and PHBV were generated, and samples were prepared by mechanical mixing (roll mixer and/or internal mixer) and cured by radical C-C crosslinking. The obtained specimens were investigated with respect to their chemical and physical characteristics, applying a variety of different methods such as size exclusion chromatography, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal analysis, XRD, and mechanical testing. Our results clearly indicate that NR-PHBV blends exhibit excellent material characteristics including high elasticity and durability. Additionally, biodegradability was tested by applying heterologously produced and purified depolymerases. pH shift assays and morphology analyses of the surface of depolymerase-treated NR-PHBV through electron scanning microscopy confirmed the enzymatic degradation of PHBV. Altogether, we prove that NR is highly suitable to substitute fossil-based plasticizers; NR-PHBV blends are biodegradable and, hence, should be considered as interesting materials for a great number of applications.
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Affiliation(s)
- Carina Frank
- Acib-GmbH, Krenngasse 32, A-8010 Graz, Austria
- Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Anita Emmerstorfer-Augustin
- Acib-GmbH, Krenngasse 32, A-8010 Graz, Austria
- Institute for Molecular Biotechnology, Graz University of Technology, NAWI Graz, BioTechMed-Graz, Petersgasse 14, A-8010 Graz, Austria
| | - Thomas Rath
- Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Gregor Trimmel
- Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Manfred Nachtnebel
- Graz Centre for Electron Microscopy, Steyrergasse 17, A-8010 Graz, Austria
| | - Franz Stelzer
- Acib-GmbH, Krenngasse 32, A-8010 Graz, Austria
- Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
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Aparicio-Collado JL, Zheng Q, Molina-Mateo J, Torregrosa Cabanilles C, Vidaurre A, Serrano-Aroca Á, Sabater i Serra R. Engineered Highly Porous Polyvinyl Alcohol Hydrogels with Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Graphene Nanosheets for Musculoskeletal Tissue Engineering: Morphology, Water Sorption, Thermal, Mechanical, Electrical Properties, and Biocompatibility. Materials (Basel) 2023; 16:3114. [PMID: 37109950 PMCID: PMC10145967 DOI: 10.3390/ma16083114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 06/19/2023]
Abstract
Electroactive composite materials are very promising for musculoskeletal tissue engineering because they can be applied in combination with electrostimulation. In this context, novel graphene-based poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/polyvinyl alcohol (PHBV/PVA) semi-interpenetrated networks (semi-IPN) hydrogels were engineered with low amounts of graphene (G) nanosheets dispersed within the polymer matrix to endow them with electroactive properties. The nanohybrid hydrogels, obtained by applying a hybrid solvent casting-freeze-drying method, show an interconnected porous structure and a high water-absorption capacity (swelling degree > 1200%). The thermal characterization indicates that the structure presents microphase separation, with PHBV microdomains located between the PVA network. The PHBV chains located in the microdomains are able to crystallize; even more after the addition of G nanosheets, which act as a nucleating agent. Thermogravimetric analysis indicates that the degradation profile of the semi-IPN is located between those of the neat components, with an improved thermal stability at high temperatures (>450 °C) after the addition of G nanosheets. The mechanical (complex modulus) and electrical properties (surface conductivity) significantly increase in the nanohybrid hydrogels with 0.2% of G nanosheets. Nevertheless, when the amount of G nanoparticles increases fourfold (0.8%), the mechanical properties diminish and the electrical conductivity does not increase proportionally, suggesting the presence of G aggregates. The biological assessment (C2C12 murine myoblasts) indicates a good biocompatibility and proliferative behavior. These results reveal a new conductive and biocompatible semi-IPN with remarkable values of electrical conductivity and ability to induce myoblast proliferation, indicating its great potential for musculoskeletal tissue engineering.
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Affiliation(s)
- José Luis Aparicio-Collado
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
| | - Qiqi Zheng
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
| | - José Molina-Mateo
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
| | - Constantino Torregrosa Cabanilles
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
| | - Ana Vidaurre
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 46022 València, Spain
| | - Ángel Serrano-Aroca
- Biomaterials and Bioengineering Lab, Centro de Investigación Traslacional San Alberto Magno, Universidad Católica de Valencia San Vicente Mártir, 46001 València, Spain
| | - Roser Sabater i Serra
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 València, Spain; (J.L.A.-C.); (J.M.-M.); (C.T.C.); (A.V.)
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 46022 València, Spain
- Department of Electrical Engineering, Universitat Politècnica de València, 46022 València, Spain
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Gherasim O, Grumezescu V, Irimiciuc SA. Overview of Antimicrobial Biodegradable Polyester-Based Formulations. Int J Mol Sci 2023; 24. [PMID: 36769266 DOI: 10.3390/ijms24032945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/18/2023] [Accepted: 01/21/2023] [Indexed: 02/05/2023] Open
Abstract
As the clinical complications induced by microbial infections are known to have life-threatening side effects, conventional anti-infective therapy is necessary, but not sufficient to overcome these issues. Some of their limitations are connected to drug-related inefficiency or resistance and pathogen-related adaptive modifications. Therefore, there is an urgent need for advanced antimicrobials and antimicrobial devices. A challenging, yet successful route has been the development of new biostatic or biocide agents and biomaterials by considering the indisputable advantages of biopolymers. Polymers are attractive materials due to their physical and chemical properties, such as compositional and structural versatility, tunable reactivity, solubility and degradability, and mechanical and chemical tunability, together with their intrinsic biocompatibility and bioactivity, thus enabling the fabrication of effective pharmacologically active antimicrobial formulations. Besides representing protective or potentiating carriers for conventional drugs, biopolymers possess an impressive ability for conjugation or functionalization. These aspects are key for avoiding malicious side effects or providing targeted and triggered drug delivery (specific and selective cellular targeting), and generally to define their pharmacological efficacy. Moreover, biopolymers can be processed in different forms (particles, fibers, films, membranes, or scaffolds), which prove excellent candidates for modern anti-infective applications. This review contains an overview of antimicrobial polyester-based formulations, centered around the effect of the dimensionality over the properties of the material and the effect of the production route or post-processing actions.
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Khamplod T, Winterburn JB, Cartmell SH. Electrospun poly(3-hydroxybutyrate-co-3-hydroxyvalerate) scaffolds - a step towards ligament repair applications. Sci Technol Adv Mater 2022; 23:895-910. [PMID: 36570876 PMCID: PMC9769142 DOI: 10.1080/14686996.2022.2149034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/11/2022] [Accepted: 11/13/2022] [Indexed: 06/17/2023]
Abstract
The incidence of anterior cruciate ligament (ACL) ruptures is approximately 50 per 100,000 people. ACL rupture repair methods that offer better biomechanics have the potential to reduce long term osteoarthritis. To improve ACL regeneration biomechanically similar, biocompatible and biodegradable tissue scaffolds are required. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), with high 3-hydroxyvalerate (3HV) content, based scaffold materials have been developed, with the advantages of traditional tissue engineering scaffolds combined with attractive mechanical properties, e.g., elasticity and biodegradability. PHBV with 3HV fractions of 0 to 100 mol% were produced in a controlled manner allowing specific compositions to be targeted, giving control over material properties. In conjunction electrospinning conditions were altered, to manipulate the degree of fibre alignment, with increasing collector rotating speed used to obtain random and aligned PHBV fibres. The PHBV based materials produced were characterised, with mechanical properties, thermal properties and surface morphology being studied. An electrospun PHBV fibre mat with 50 mol% 3HV content shows a significant increase in elasticity compared to those with lower 3HV content and could be fabricated into aligned fibres. Biocompatibility testing with L929 fibroblasts demonstrates good cell viability, with the aligned fibre network promoting fibroblast alignment in the axial fibre direction, desirable for ACL repair applications. Dynamic load testing shows that the 50 mol% 3HV PHBV material produced can withstand cyclic loading with reasonable resilience. Electrospun PHBV can be produced with low batch variability and tailored, application specific properties, giving these biomaterials promise in tissue scaffold applications where aligned fibre networks are desired, such as ACL regeneration. .
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Affiliation(s)
- Thammarit Khamplod
- Department of Chemical Engineering, School of Engineering, Faculty of Science and Engineering, The University of Manchester, Manchester, UK
- Henry Royce Institute, The University of Manchester, Manchester, UK
| | - James B. Winterburn
- Department of Chemical Engineering, School of Engineering, Faculty of Science and Engineering, The University of Manchester, Manchester, UK
| | - Sarah H. Cartmell
- Henry Royce Institute, The University of Manchester, Manchester, UK
- Department of Materials Science, School of Natural Sciences, Faculty of Science and Engineering, The University of Manchester, Manchester, UK
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Hathi ZJ, Haque MA, Priya A, Qin ZH, Huang S, Lam CH, Ladakis D, Pateraki C, Mettu S, Koutinas A, Du C, Lin CSK. Fermentative bioconversion of food waste into biopolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) using Cupriavidus necator. Environ Res 2022; 215:114323. [PMID: 36115419 DOI: 10.1016/j.envres.2022.114323] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/20/2022] [Accepted: 09/07/2022] [Indexed: 05/27/2023]
Abstract
Dependency on plastic commodities has led to a recurrent increase in their global production every year. Conventionally, plastic products are derived from fossil fuels, leading to severe environmental concerns. The recent coronavirus disease 2019 pandemic has triggered an increase in medical waste. Conversely, it has disrupted the supply chain of personal protective equipment (PPE). Valorisation of food waste was performed to cultivate C. necator for fermentative production of biopolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The increase in biomass, PHBV yield and molar 3-hydroxy valerate (3HV) content was estimated after feeding volatile fatty acids. The fed-batch fermentation strategy reported in this study produced 15.65 ± 0.14 g/L of biomass with 5.32 g/L of PHBV with 50% molar 3HV content. This is a crucial finding, as molar concentration of 3HV can be modulated to suit the specification of biopolymer (film or fabric). The strategy applied in this study addresses the issue of global food waste burden and subsequently generates biopolymer PHBV, turning waste to wealth.
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Affiliation(s)
- Zubeen J Hathi
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Md Ariful Haque
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Anshu Priya
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Zi-Hao Qin
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Shuquan Huang
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Chun Ho Lam
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Dimitris Ladakis
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Chrysanthi Pateraki
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Srinivas Mettu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria, 3000, Australia
| | - Apostolis Koutinas
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Chenyu Du
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom
| | - Carol Sze Ki Lin
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong.
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Khan N, Ali I, Mazhar S, Munir S, Batool R, Jamil N. Co-Culture of Halotolerant Bacteria to Produce Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Using Sewage Wastewater Substrate. Polymers (Basel) 2022; 14. [PMID: 36433088 DOI: 10.3390/polym14224963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 10/28/2022] [Accepted: 10/31/2022] [Indexed: 11/18/2022] Open
Abstract
The focus of the current study was the use of sewage wastewater to obtain PHA from a co-culture to produce a sustainable polymer. Two halotolerant bacteria, Bacillus halotolerans 14SM (MZ801771) and Bacillus aryabhattai WK31 (MT453992), were grown in a consortium to produce PHA. Sewage wastewater (SWW) was used to produce PHA, and glucose was used as a reference substrate to compare the growth and PHA production parameters. Both bacterial strains produced PHA in monoculture, but a copolymer was obtained when the co-cultures were used. The co-culture accumulated a maximum of 54% after 24 h of incubation in 10% SWW. The intracellular granules indicated the presence of nucleation sites for granule initiation. The average granule size was recorded to be 231 nm; micrographs also indicated the presence of extracellular polymers and granule-associated proteins. Fourier transform infrared spectroscopy (FTIR) analysis of the polymer produced by the consortium showed a significant peak at 1731 cm-1, representing the C=O group. FTIR also presented peaks in the region of 2800 cm-1 to 2900 cm-1, indicating C-C stretching. Proton nuclear magnetic resonance (1HNMR) of the pure polymer indicated chemical shifts resulting from the proton of hydroxy valerate and hydroxybutyrate, confirming the production of poly(3-hydroxybutyrate-co-3-hydroxy valerate) (P3HBV). A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay showed that the copolymer was biocompatible, even at a high concentration of 5000 µg mL-1. The results of this study show that bacterial strains WK31 and 14SM can be used to synthesize a copolymer of butyrate and valerate using the volatile fatty acids present in the SWW, such as propionic acid or pentanoic acid. P3HBV can also be used to provide an extracellular matrix for cell-line growth without causing any cytotoxic effects.
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Pecorini G, Braccini S, Parrini G, Chiellini F, Puppi D. Additive Manufacturing of Poly(3-hydroxybutyrate- co-3-hydroxyvalerate)/Poly(D,L-lactide- co-glycolide) Biphasic Scaffolds for Bone Tissue Regeneration. Int J Mol Sci 2022; 23:3895. [PMID: 35409254 DOI: 10.3390/ijms23073895] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 03/18/2022] [Accepted: 03/30/2022] [Indexed: 02/04/2023] Open
Abstract
Polyhydroxyalkanoates are biopolyesters whose biocompatibility, biodegradability, environmental sustainability, processing versatility, and mechanical properties make them unique scaffolding polymer candidates for tissue engineering. The development of innovative biomaterials suitable for advanced Additive Manufacturing (AM) offers new opportunities for the fabrication of customizable tissue engineering scaffolds. In particular, the blending of polymers represents a useful strategy to develop AM scaffolding materials tailored to bone tissue engineering. In this study, scaffolds from polymeric blends consisting of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(D,L-lactide-co-glycolide) (PLGA) were fabricated employing a solution-extrusion AM technique, referred to as Computer-Aided Wet-Spinning (CAWS). The scaffold fibers were constituted by a biphasic system composed of a continuous PHBV matrix and a dispersed PLGA phase which established a microfibrillar morphology. The influence of the blend composition on the scaffold morphological, physicochemical, and biological properties was demonstrated by means of different characterization techniques. In particular, increasing the content of PLGA in the starting solution resulted in an increase in the pore size, the wettability, and the thermal stability of the scaffolds. Overall, in vitro biological experiments indicated the suitability of the scaffolds to support murine preosteoblast cell colonization and differentiation towards an osteoblastic phenotype, highlighting higher proliferation for scaffolds richer in PLGA.
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Wong HSJ, Bhubalan K, Amirul AA. A Critical Review on the Economically Feasible and Sustainable Poly(3-Hydroxybutyrate- co-3-hydroxyvalerate) Production from Alkyl Alcohols. Polymers (Basel) 2022; 14:670. [PMID: 35215584 DOI: 10.3390/polym14040670] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/03/2022] [Accepted: 02/05/2022] [Indexed: 01/14/2023] Open
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-co-3HV)) is the most studied short-chain-length polyhydroxyalkanoates (PHA) with high application importance in various fields. The domination of high-cost propionate and valerate over other 3-hydroxyvalerate (3HV) precursors owing to their wide preference among PHA-producing bacteria has hindered the development of diverse production processes. As alkyl alcohols are mainly produced from inexpensive starting materials through oxo synthesis, they contribute a cost-effective advantage over propionate and valerate. Moreover, alkyl alcohols can be biosynthesized from natural substrates and organic wastes. Despite their great potential, their toxicity to most PHA-producing bacteria has been the major drawback for their wide implementation as 3HV precursors for decades. Although the standard PHA-producing bacteria Cupriavidus necator showed promising alcohol tolerance, the 3HV yield was discouraging. Continuous discovery of alkyl alcohols-utilizing PHA-producing bacteria has enabled broader choices in 3HV precursor selection for diverse P(3HB-co-3HV) production processes with higher economic feasibility. Besides continuous effort in searching for promising wild-type strains, genetic engineering to construct promising recombinant strains based on the understanding of the mechanisms involved in alkyl alcohols toxicity and tolerance is an alternative approach. However, more studies are required for techno-economic assessment to analyze the economic performance of alkyl alcohol-based production compared to that of organic acids.
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Voronova MI, Gurina DL, Surov OV. Properties of Poly(3-hydroxybutyrate- co-3-hydroxyvalerate)/Polycaprolactone Polymer Mixtures Reinforced by Cellulose Nanocrystals: Experimental and Simulation Studies. Polymers (Basel) 2022; 14:340. [PMID: 35054746 PMCID: PMC8780583 DOI: 10.3390/polym14020340] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/05/2022] [Accepted: 01/12/2022] [Indexed: 02/05/2023] Open
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/polycaprolactone (PHBV/PCL) polymer mixtures reinforced by cellulose nanocrystals (CNCs) have been obtained. To improve the CNC compatibility with the hydrophobic PHBV/PCL matrix, the CNC surface was modified by amphiphilic polymers, i.e., polyvinylpyrrolidone (PVP) and polyacrylamide (PAM). The polymer composites were characterized by FTIR, DSC, TG, XRD, microscopy, BET surface area, and tensile testing. The morphological, sorption, thermal, and mechanical properties of the obtained composites have been studied. It was found out that with an increase in the CNC content in the composites, the porosity of the films increased, which was reflected in an increase in their specific surface areas and water sorption. An analysis of the IR spectra confirms that hydrogen bonds can be formed between the CNC hydroxyl- and the -CO- groups of PCL and PHBV. The thermal decomposition of CNC in the PHBV/PCL/CNC composites starts at a much higher temperature than the decomposition of pure CNC. It was revealed that CNCs can either induce crystallization and the polymer crystallite growth or act as a compatibilizer of a mixture of the polymers causing their amorphization. The CNC addition significantly reduces the elongation and strength of the composites, but changes Young's modulus insignificantly, i.e., the mechanical properties of the composites are retained under conditions of small linear deformations. A molecular-dynamics simulation of several systems, starting from simplest binary (solvent-polymer) and finishing with multi-component (CNC-polymer mixture-solvent) systems, has been made. It is concluded that the surface modification of CNCs with amphiphilic polymers makes it possible to obtain the CNC composites with hydrophobic polymer matrices.
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Affiliation(s)
| | | | - Oleg V. Surov
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., 153045 Ivanovo, Russia; (M.I.V.); (D.L.G.)
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El-Newehy MH, Kim HY, Khattab TA, Abdulhameed MM, El-Naggar ME. Fabrication, microstructure characterization, and degradation performance of electrospun mats based on poly(3-hydroxybutyrate-co-3 hydroxyvalerate)/polyethylene glycol blend for potential tissue engineering. LUMINESCENCE 2021; 37:323-331. [PMID: 34871472 DOI: 10.1002/bio.4174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 11/11/2022]
Abstract
There have been strong demands for nanofibrous scaffolds fabricated by electrospinning for various fields due to their various advantages. Electrospun poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) fibre mats were prepared. The effects of processing variables as well as the inclusion of poly(ethylene glycol) (PEG) on the morphologies of generated fibres were investigated using Fourier-transform infrared spectroscopy and scanning electron microscopy. The average fibrous diameter was monitored in the range 400-3000 nm relying on the total content of PEG. The fluorescence cell imaging of electrospun mats was also explored. The results of cell viability demonstrated that skin fibroblast BJ-1 cells showed different adhesions and growth rates for the three kinds of PHBV fibres. Electrospun PHBV mats with low amount of PEG offer a high-quality medium for cell growth. Therefore, those mats exhibited high potential for soft tissue engineering, in particular wound healing.
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Affiliation(s)
- Mohamed H El-Newehy
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Hak Yong Kim
- Nano Convergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea
| | - Tawfik A Khattab
- Institute of Textile Research and Technology, National Research Centre, Dokki, Cairo, Egypt
| | - Meera Moydeen Abdulhameed
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Mehrez E El-Naggar
- Institute of Textile Research and Technology, National Research Centre, Dokki, Cairo, Egypt
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Abstract
Tailing off release in the sustained release of water-insoluble curcumin (Cur) is a significant challenge in the drug delivery system. As a novel solution, core-shell nanodrug containers have aroused many interests due to their potential improvement in drug-sustained release. In this work, a biodegradable polymer, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and hydrophilic polyvinylpyrrolidone (PVP) were exploited as drug delivery carriers by coaxial electrospinning, and the core-shell drug-loaded fibers exhibited improved sustained release of Cur. A cylindrical morphology and a clear core-shell structure were observed by scanning and transmission electron microscopies. The X-ray diffraction pattern and infrared spectroscopy revealed that Cur existed in amorphous form due to its good compatibility with PHBV and PVP. The in vitro drug release curves confirmed that the core-shell container manipulated Cur in a faster drug release process than that in the traditional PHBV monolithic container. The combination of the material and structure forms a novel nanodrug container with a better sustained release of water-insoluble Cur. This strategy is beneficial for exploiting more functional biomedical materials to improve the drug release behavior.
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Affiliation(s)
- Yubo Liu
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China
| | - Xiaohong Chen
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China.,Shanghai Engineering Technology Research Center for High-Performance Medical Device Materials, Shanghai 200093, China
| | - Deng-Guang Yu
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China.,Shanghai Engineering Technology Research Center for High-Performance Medical Device Materials, Shanghai 200093, China
| | - Hang Liu
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China
| | - Yuyang Liu
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China
| | - Ping Liu
- School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China.,Shanghai Engineering Technology Research Center for High-Performance Medical Device Materials, Shanghai 200093, China
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Li HF, Wang MR, Tian LY, Li ZJ. Production of Polyhydroxyalkanoates (PHAs) by Vibrio alginolyticus Strains Isolated from Salt Fields. Molecules 2021; 26:molecules26206283. [PMID: 34684864 PMCID: PMC8537743 DOI: 10.3390/molecules26206283] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/09/2021] [Accepted: 10/14/2021] [Indexed: 11/16/2022] Open
Abstract
Vibrio alginolyticus is a halophilic organism usually found in marine environments. It has attracted attention as an opportunistic pathogen of aquatic animals and humans, but there are very few reports on polyhydroxyalkanoate (PHA) production using V. alginolyticus as the host. In this study, two V. alginolyticus strains, LHF01 and LHF02, isolated from water samples collected from salt fields were found to produce poly(3-hydroxybutyrate) (PHB) from a variety of sugars and organic acids. Glycerol was the best carbon source and yielded the highest PHB titer in both strains. Further optimization of the NaCl concentration and culture temperature improved the PHB titer from 1.87 to 5.08 g/L in V. alginolyticus LHF01. In addition, the use of propionate as a secondary carbon source resulted in the production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). V. alginolyticus LHF01 may be a promising host for PHA production using cheap waste glycerol from biodiesel refining.
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Gigante V, Cinelli P, Righetti MC, Sandroni M, Polacco G, Seggiani M, Lazzeri A. On the Use of Biobased Waxes to Tune Thermal and Mechanical Properties of Polyhydroxyalkanoates-Bran Biocomposites. Polymers (Basel) 2020; 12:polym12112615. [PMID: 33172020 PMCID: PMC7694654 DOI: 10.3390/polym12112615] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 10/30/2020] [Accepted: 11/03/2020] [Indexed: 01/26/2023] Open
Abstract
In this work, processability and mechanical performances of bio-composites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing 5, 10, and 15 wt % of bran fibers, untreated and treated with natural carnauba and bee waxes were evaluated. Wheat bran, the main byproduct of flour milling, was used as filler to reduce the final cost of the PHBV-based composites and, in the same time, to find a potential valorization to this agro-food by-product, widely available at low cost. The results showed that the wheat bran powder did not act as reinforcement, but as filler for PHBV, due to an unfavorable aspect ratio of the particles and poor adhesion with the polymeric matrix, with consequent moderate loss in mechanical properties (tensile strength and elongation at break). The surface treatment of the wheat bran particles with waxes, and in particular with beeswax, was found to improve the mechanical performance in terms of tensile properties and impact resistance of the composites, enhancing the adhesion between the PHBV-based polymeric matrix and the bran fibers, as confirmed by predictive analytic models and dynamic mechanical analysis results.
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Affiliation(s)
- Vito Gigante
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
| | - Patrizia Cinelli
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
- CNR-IPCF, National Research Council—Institute for Chemical and Physical Processes, Via Moruzzi 1, 56124 Pisa, Italy;
- Correspondence: (P.C.); (M.S.)
| | - Maria Cristina Righetti
- CNR-IPCF, National Research Council—Institute for Chemical and Physical Processes, Via Moruzzi 1, 56124 Pisa, Italy;
| | - Marco Sandroni
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
| | - Giovanni Polacco
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
| | - Maurizia Seggiani
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
- Correspondence: (P.C.); (M.S.)
| | - Andrea Lazzeri
- Inter University Consortium of Material Science and Technology, c/o Unit Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy; (V.G.); (M.S.); (G.P.); (A.L.)
- CNR-IPCF, National Research Council—Institute for Chemical and Physical Processes, Via Moruzzi 1, 56124 Pisa, Italy;
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Antunes A, Popelka A, Aljarod O, Hassan MK, Kasak P, Luyt AS. Accelerated Weathering Effects on Poly(3-hydroxybutyrate- co-3-hydroxyvalerate) (PHBV) and PHBV/TiO 2 Nanocomposites. Polymers (Basel) 2020; 12:E1743. [PMID: 32764247 DOI: 10.3390/polym12081743] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/22/2020] [Accepted: 07/30/2020] [Indexed: 11/25/2022] Open
Abstract
The effect of accelerated weathering on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV-based nanocomposites with rutile titanium (IV) dioxide (PHBV/TiO2) was investigated. The accelerated weathering test applied consecutive steps of UV irradiation (at 340 nm and 0.76 W m−2 irradiance) and moisture at 50 °C following the ASTM D4329 standard for up to 2000 h of exposure time. The morphology, chemical structure, crystallization, as well as the mechanical and thermal properties were studied. Samples were characterized after 500, 1000, and 2000 h of exposure time. Different degradation mechanisms were proposed to occur during the weathering exposure and were confirmed based on the experimental data. The PHBV surface revealed cracks and increasing roughness with the increasing exposure time, whereas the PHBV/TiO2 nanocomposites showed surface changes only after 2000 h of accelerated weathering. The degradation of neat PHBV under moisture and UV exposure occurred preferentially in the amorphous phase. In contrast, the presence of TiO2 in the nanocomposites retarded this process, but the degradation would occur simultaneously in both the amorphous and crystalline segments of the polymer after long exposure times. The thermal stability, as well as the temperature and rate of crystallization, decreased in the absence of TiO2. TiO2 not only provided UV protection, but also restricted the physical mobility of the polymer chains, acting as a nucleating agent during the crystallization process. It also slowed down the decrease in mechanical properties. The mechanical properties were shown to gradually decrease for the PHBV/TiO2 nanocomposites, whereas a sharp drop was observed for the neat PHBV after an accelerated weathering exposure. Atomic force microscopy (AFM), using the amplitude modulation–frequency modulation (AM–FM) tool, also confirmed the mechanical changes in the surface area of the PHBV and PHBV/TiO2 samples after accelerated weathering exposure. The changes in the physical and chemical properties of PHBV/TiO2 confirm the barrier activity of TiO2 for weathering attack and its retardation of the degradation process.
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Alsafadi D, Al-Mashaqbeh O, Mansour A, Alsaad M. Optimization of nitrogen source supply for enhanced biosynthesis and quality of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by extremely halophilic archaeon Haloferax mediterranei. Microbiologyopen 2020; 9:e1055. [PMID: 32410392 PMCID: PMC7424248 DOI: 10.1002/mbo3.1055] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/13/2020] [Accepted: 04/20/2020] [Indexed: 11/06/2022] Open
Abstract
The extreme halophilic archaeon, Haloferax mediterranei can accumulate polyhydroxyalkanoate (PHA) from different renewable resources. To enhance the biosynthesis and quality of PHA, H. mediterranei cultivation media was optimized at different C/N ratios using glucose as the main carbon source. Three sets of media (yeast extract [YE], NH4 Cl and combination of YE and NH4 Cl) were prepared at different nitrogen concentrations to achieve C/N ratios of 9, 20, and 35, respectively. The media containing YE (organic nitrogen source) produced a higher growth rate of H. mediterranei than NH4 Cl (inorganic source) at all tested C/N ratios. The highest PHA accumulation (18.4% PHA/cell dry mass) was achieved in a media that combined YE with NH4 Cl at a C/N ratio of 20. Analysis of the produced polymers revealed the production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) with different 3-hydroxyvalerate (3HV) content. The polymers produced from YE and the combined media have greater 3HV content (10 mol%) than those polymers recovered from NH4 Cl (1.5 mol%). Resultingly, PHBHV from YE and the combined media displayed reduced melting points at 144°C. The nitrogen type/concentration was found to also have an impact on the molecular weights and polydispersity indices of the produced biopolymers. Furthermore, the tensile strengths were found to vary with the best tensile strength (14.4 MPa) being recorded for the polymer recovered from YE at C/N = 9. Interestingly, the tensile strength of PHBHV was significantly higher than petroleum-based polyethylene (13.5 MPa), making it a much more suitable bioplastic for industrial application.
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Affiliation(s)
- Diya Alsafadi
- Biosynthesis and Biocatalysis Research Unit, Foundational Science Research Division, Royal Scientific Society, Amman, Jordan
| | | | - Aya Mansour
- Biosynthesis and Biocatalysis Research Unit, Foundational Science Research Division, Royal Scientific Society, Amman, Jordan
| | - Majd Alsaad
- Biosynthesis and Biocatalysis Research Unit, Foundational Science Research Division, Royal Scientific Society, Amman, Jordan
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Zhuikov VA, Zhuikova YV, Makhina TK, Myshkina VL, Rusakov A, Useinov A, Voinova VV, Bonartseva GA, Berlin AA, Bonartsev AP, Iordanskii AL. Comparative Structure-Property Characterization of Poly(3-Hydroxybutyrate-Co-3-Hydroxyvalerate)s Films under Hydrolytic and Enzymatic Degradation: Finding a Transition Point in 3-Hydroxyvalerate Content. Polymers (Basel) 2020; 12:E728. [PMID: 32214006 PMCID: PMC7183050 DOI: 10.3390/polym12030728] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/14/2020] [Accepted: 03/20/2020] [Indexed: 01/23/2023] Open
Abstract
The hydrolytic and enzymatic degradation of polymer films of poly(3-hydroxybutyrate) (PHB) of different molecular mass and its copolymers with 3-hydroxyvalerate (PHBV) of different 3-hydroxyvalerate (3-HV) content and molecular mass, 3-hydroxy-4-methylvalerate (PHB4MV), and polyethylene glycol (PHBV-PEG) produced by the Azotobacter chroococcum 7B by controlled biosynthesis technique were studied under in vitro model conditions. The changes in the physicochemical properties of the polymers during their in vitro degradation in the pancreatic lipase solution and in phosphate-buffered saline for a long time (183 days) were investigated using different analytical techniques. A mathematical model was used to analyze the kinetics of hydrolytic degradation of poly(3-hydroxyaklannoate)s by not autocatalytic and autocatalytic hydrolysis mechanisms. It was also shown that the degree of crystallinity of some polymers changes differently during degradation in vitro. The total mass of the films decreased slightly up to 8-9% (for the high-molecular weight PHBV with the 3-HV content 17.6% and 9%), in contrast to the copolymer molecular mass, the decrease of which reached 80%. The contact angle for all copolymers after the enzymatic degradation decreased by an average value of 23% compared to 17% after the hydrolytic degradation. Young's modulus increased up to 2-fold. It was shown that the effect of autocatalysis was observed during enzymatic degradation, while autocatalysis was not available during hydrolytic degradation. During hydrolytic and enzymatic degradation in vitro, it was found that PHBV, containing 5.7-5.9 mol.% 3-HV and having about 50% crystallinity degree, presents critical content, beyond which the structural and mechanical properties of the copolymer have essentially changed. The obtained results could be applicable to biomedical polymer systems and food packaging materials.
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Affiliation(s)
- Vsevolod A. Zhuikov
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
| | - Yuliya V. Zhuikova
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
| | - Tatiana K. Makhina
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
| | - Vera L. Myshkina
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
| | - Alexey Rusakov
- Federal State Budgetary Institution “Technological Institute for Superhard and Novel Carbon Materials”, 7a Tsentralnaya Street, Troitsk, 108840 Moscow, Russia; (A.R.); (A.U.)
| | - Alexey Useinov
- Federal State Budgetary Institution “Technological Institute for Superhard and Novel Carbon Materials”, 7a Tsentralnaya Street, Troitsk, 108840 Moscow, Russia; (A.R.); (A.U.)
| | - Vera V. Voinova
- Faculty of Biology, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia;
| | - Garina A. Bonartseva
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
| | - Alexandr A. Berlin
- Research Center of Chemical Physics the Russian Academy of Sciences, Kosygin str. 4, 119991 Moscow, Russia; (A.A.B.); (A.L.I.)
| | - Anton P. Bonartsev
- Research Center of Biotechnology of the Russian Academy of Sciences 33, Bld. 2 Leninsky Ave, 119071 Moscow, Russia; (Y.V.Z.); (T.K.M.); (V.L.M.); (G.A.B.); (A.P.B.)
- Faculty of Biology, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia;
| | - Alexey L. Iordanskii
- Research Center of Chemical Physics the Russian Academy of Sciences, Kosygin str. 4, 119991 Moscow, Russia; (A.A.B.); (A.L.I.)
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Kelly CA, Hay JN, Turner RP, Jenkins MJ. The Effect of a Secondary Process on the Analysis of Isothermal Crystallisation Kinetics by Differential Scanning Calorimetry. Polymers (Basel) 2019; 12:polym12010019. [PMID: 31861861 PMCID: PMC7022950 DOI: 10.3390/polym12010019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 12/13/2019] [Accepted: 12/18/2019] [Indexed: 11/21/2022] Open
Abstract
This paper demonstrates the application of a modified Avrami equation in the analysis of crystallisation curves obtained using differential scanning calorimetry (DSC). The model incorporates a square root of time dependence of the secondary process into the conventional Avrami equation and, although previously validated using laser flash analysis and infrared spectroscopy, is not currently transferable to DSC. Application of the model to calorimetric data required long-duration isotherms and a series of data treatments. Once implemented, the square root of time dependence of the secondary process was once again observed. After separation of the secondary process from the primary, a mechanistic n value of 3 was obtained for the primary process. Kinetic parameters obtained from the analysis were used in the model to regenerate the fractional crystallinity curves. Comparison of the model with experimental data generated R2 values in excess of 0.995. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) was used as model polymer due to the prominent secondary crystallisation behaviour that this polymer is known to display.
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Chen J, Mitra R, Zhang S, Zuo Z, Lin L, Zhao D, Xiang H, Han J. Unusual Phosphoenolpyruvate (PEP) Synthetase-Like Protein Crucial to Enhancement of Polyhydroxyalkanoate Accumulation in Haloferax mediterranei Revealed by Dissection of PEP-Pyruvate Interconversion Mechanism. Appl Environ Microbiol 2019; 85:e00984-19. [PMID: 31350314 DOI: 10.1128/AEM.00984-19] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 07/08/2019] [Indexed: 12/21/2022] Open
Abstract
Phosphoenolpyruvate (PEP)/pyruvate interconversion is a major metabolic point in glycolysis and gluconeogenesis and is catalyzed by various sets of enzymes in different Archaea groups. In this study, we report the key enzymes that catalyze the anabolic and catabolic directions of the PEP/pyruvate interconversion in Haloferax mediterranei The in silico analysis showed the presence of a potassium-dependent pyruvate kinase (PYKHm [HFX_0773]) and two phosphoenol pyruvate synthetase (PPS) candidates (PPSHm [HFX_0782] and a PPS homolog protein named PPS-like [HFX_2676]) in this strain. Expression of the pyk Hm gene and pps Hm was induced by glycerol and pyruvate, respectively; whereas the pps-like gene was not induced at all. Similarly, genetic analysis and enzyme activities of purified proteins showed that PYKHm catalyzed the conversion from PEP to pyruvate and that PPSHm catalyzed the reverse reaction, while PPS-like protein displayed no function in PEP/pyruvate interconversion. Interestingly, knockout of the pps-like gene led to a 70.46% increase in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) production. The transcriptome sequencing (RNA-Seq) and quantitative reverse transcription-PCR (qRT-PCR) results showed that many genes responsible for PHBV monomer supply and for PHBV synthesis were upregulated in a pps-like gene deletion strain and thereby improved PHBV accumulation. Additionally, our phylogenetic evidence suggested that PPS-like protein diverged from PPS enzyme and evolved as a distinct protein with novel function in haloarchaea. Our findings attempt to fill the gaps in central metabolism of Archaea by providing comprehensive information about key enzymes involved in the haloarchaeal PEP/pyruvate interconversion, and we also report a high-yielding PHBV strain with great future potentials.IMPORTANCE Archaea, the third domain of life, have evolved diversified metabolic pathways to cope with their extreme habitats. Phosphoenol pyruvate (PEP)/pyruvate interconversion during carbohydrate metabolism is one such important metabolic process that is highly differentiated among Archaea However, this process is still uncharacterized in the haloarchaeal group. Haloferax mediterranei is a well-studied haloarchaeon that has the ability to produce polyhydroxyalkanoates (PHAs) under unbalanced nutritional conditions. In this study, we identified the key enzymes involved in this interconversion and discussed their differences with their counterparts from other members of the Archaea and Bacteria domains. Notably, we found a novel protein, phosphoenolpyruvate synthetase-like (PPS-like), which exhibited high homology to PPS enzyme. However, PPS-like protein has evolved some distinct sequence features and functions, and strikingly the corresponding gene deletion helped to enhance poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) synthesis significantly. Overall, we have filled the gap in knowledge about PEP/pyruvate interconversion in haloarchaea and reported an efficient strategy for improving PHBV production in H. mediterranei.
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Öner M, Kızıl G, Keskin G, Pochat-Bohatier C, Bechelany M. The Effect of Boron Nitride on the Thermal and Mechanical Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate). Nanomaterials (Basel) 2018; 8:E940. [PMID: 30445720 PMCID: PMC6265921 DOI: 10.3390/nano8110940] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/09/2018] [Accepted: 11/13/2018] [Indexed: 11/16/2022]
Abstract
The thermal and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) composites filled with boron nitride (BN) particles with two different sizes and shapes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA) and mechanical testing. The biocomposites were produced by melt extrusion of PHBV with untreated BN and surface-treated BN particles. Thermogravimetric analysis (TGA) showed that the thermal stability of the composites was higher than that of neat PHBV while the effect of the different shapes and sizes of the particles on the thermal stability was insignificant. DSC analysis showed that the crystallinity of the PHBV was not affected significantly by the change in filler concentration and the type of the BN nanoparticle but decreasing of the crystallinity of PHBV/BN composites was observed at higher loadings. BN particles treated with silane coupling agent yielded nanocomposites characterized by good mechanical performance. The results demonstrate that mechanical properties of the composites were found to increase more for the silanized flake type BN (OSFBN) compared to silanized hexagonal disk type BN (OSBN). The highest Young's modulus was obtained for the nanocomposite sample containing 1 wt.% OSFBN, for which increase of Young's modulus up to 19% was observed in comparison to the neat PHBV. The Halpin⁻Tsai and Hui⁻Shia models were used to evaluate the effect of reinforcement by BN particles on the elastic modulus of the composites. Micromechanical models for initial composite stiffness showed good correlation with experimental values.
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Affiliation(s)
- Mualla Öner
- Chemical Engineering Department, Chemical-Metallurgical Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
| | - Gülnur Kızıl
- Chemical Engineering Department, Chemical-Metallurgical Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
| | - Gülşah Keskin
- Chemical Engineering Department, Chemical-Metallurgical Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
| | - Celine Pochat-Bohatier
- Institut Européen des Membranes, IEM UMR-5635, ENCSM, CNRS, Université de Montpellier, ENSCM, CNRS, Place Eugéne Bataillon, 34000 Montpellier, France.
| | - Mikhael Bechelany
- Institut Européen des Membranes, IEM UMR-5635, ENCSM, CNRS, Université de Montpellier, ENSCM, CNRS, Place Eugéne Bataillon, 34000 Montpellier, France.
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Sarasini F, Luzi F, Dominici F, Maffei G, Iannone A, Zuorro A, Lavecchia R, Torre L, Carbonell-Verdu A, Balart R, Puglia D. Effect of Different Compatibilizers on Sustainable Composites Based on a PHBV/PBAT Matrix Filled with Coffee Silverskin. Polymers (Basel) 2018; 10:E1256. [PMID: 30961181 DOI: 10.3390/polym10111256] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 11/02/2018] [Accepted: 11/08/2018] [Indexed: 11/24/2022] Open
Abstract
This work investigates the feasibility of using coffee silverskin (CSS), one of the most abundant coffee waste products, as a reinforcing agent in biopolymer-based composites. The effect of using two compatibilizers, a maleinized linseed oil (MLO) and a traditional silane (APTES, (3-aminopropyl)triethoxysilane), on mechanical and thermal behavior of sustainable composites based on a poly(butylene adipate-co-terephthalate/Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) PBAT/PHBV blend filled with coffee silverskin, in both the as-received state and after the extraction of antioxidants, was studied. Thermal (by differential scanning calorimetry), mechanical (by tensile testing), and morphological properties (by scanning electron microscopy) of injection molded biocomposites at three different weight contents (10, 20, and 30 wt %) were considered and discussed as a function of compatibilizer type. The effects of extraction procedure and silane treatment on surface properties of CSS were investigated by infrared spectroscopy. Obtained results confirmed that extracted CSS and silane-treated CSS provided the best combination of resistance properties and ductility, while MLO provided a limited compatibilization effect with CSS, due to the reduced amount of hydroxyl groups on CSS after extraction, suggesting that the effects of silane modification were more significant than the introduction of plasticizing agent.
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25
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Diermann SH, Lu M, Edwards G, Dargusch M, Huang H. In vitro degradation of a unique porous PHBV scaffold manufactured using selective laser sintering. J Biomed Mater Res A 2018; 107:154-162. [PMID: 30358091 DOI: 10.1002/jbm.a.36543] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/10/2018] [Accepted: 09/05/2018] [Indexed: 12/20/2022]
Abstract
Biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) scaffolds have shown great promise for bone tissue engineering applications. The investigation of their hydrolytic degradation is thus essential to understand the effect of hydrolysis on the complex biodegradation behavior of PHBV scaffolds. In this study, we investigated the degradation behavior of high molecular weight PHBV scaffolds manufactured using selective laser sintering (SLS) without using predesigned porous architectures. The manufactured scaffolds have high specific surface areas with great water-uptake abilities. After an incubation of 6 weeks in phosphate-buffered saline solution, the structural integrity of the scaffolds was unaffected. However, a significant decrease in molecular weight ranging from 39% to 46% was found. The measured weight loss was negligible, but their compressive modulus and strength both decreased, likely due to water plasticization. These findings suggest that hydrolytic degradation of PHBV by means of bulk degradation was the predominant mechanism, attributed to their excellent water absorptivity. Overall, the PHBV scaffolds manufactured using SLS exhibited adequate mechanical properties and satisfactory structural integrity after incubation. As a result, the scaffolds have great potential as candidates for bone repair in clinical practice. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 154-162, 2019.
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Affiliation(s)
- Sven H Diermann
- School of Mechanical and Mining Engineering, The University of Queensland, Queensland, 4072, Australia
| | - Mingyuan Lu
- School of Mechanical and Mining Engineering, The University of Queensland, Queensland, 4072, Australia
| | - Grant Edwards
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Queensland, 4072, Australia
| | - Matthew Dargusch
- School of Mechanical and Mining Engineering, The University of Queensland, Queensland, 4072, Australia
| | - Han Huang
- School of Mechanical and Mining Engineering, The University of Queensland, Queensland, 4072, Australia
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26
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Rivera-Briso AL, Serrano-Aroca Á. Poly(3-Hydroxybutyrate- co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications. Polymers (Basel) 2018; 10:E732. [PMID: 30960657 PMCID: PMC6403723 DOI: 10.3390/polym10070732] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 01/21/2023] Open
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, is a microbial biopolymer with excellent biocompatible and biodegradable properties that make it a potential candidate for substituting petroleum-derived polymers. However, it lacks mechanical strength, water sorption and diffusion, electrical and/or thermal properties, antimicrobial activity, wettability, biological properties, and porosity, among others, limiting its application. For this reason, many researchers around the world are currently working on how to overcome the drawbacks of this promising material. This review summarises the main advances achieved in this field so far, addressing most of the chemical and physical strategies to modify PHBV and placing particular emphasis on the combination of PHBV with other materials from a variety of different structures and properties, such as other polymers, natural fibres, carbon nanomaterials, nanocellulose, nanoclays, and nanometals, producing a wide range of composite biomaterials with increased potential applications. Finally, the most important methods to fabricate porous PHBV scaffolds for tissue engineering applications are presented. Even though great advances have been achieved so far, much research needs to be conducted still, in order to find new alternative enhancement strategies able to produce advanced PHBV-based materials able to overcome many of these challenges.
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Affiliation(s)
- Ariagna L Rivera-Briso
- Escuela de Doctorado, Universidad Católica de Valencia San Vicente Mártir, C/Guillem de Castro 65, 46008 Valencia, Spain.
| | - Ángel Serrano-Aroca
- Facultad de Veterinaria y Ciencias Experimentales, Universidad Católica de Valencia San Vicente Mártir, C/Guillem de Castro 94, 46001 Valencia, Spain.
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27
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Chang CK, Wang HMD, Lan JCW. Investigation and Characterization of Plasma-Treated Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Biopolymers for an In Vitro Cellular Study of Mouse Adipose-Derived Stem Cells. Polymers (Basel) 2018; 10:E355. [PMID: 30966390 PMCID: PMC6415170 DOI: 10.3390/polym10040355] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 03/13/2018] [Accepted: 03/20/2018] [Indexed: 12/30/2022] Open
Abstract
Polyhydroxyalkanoates (PHAs) are a type of thermoprocessable and biodegradable polyester, which represent a potential sustainable replacement for fossil-fuel synthetic polymers, such as polypropylene and polyethylene. In recent years, copolymers of PHAs, i.e., poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), have received attention for medical and packaging industrial applications, due to their biodegradable, toxic-free, and biocompatible nature. This study investigated and characterized plasma-treated PHB and PHBV films fermented with Ralstonia eutropha H16. The X-ray photoelectron spectroscopy (XPS) and water contact angle analyses on the plasma-treated PHB and PHBV film surfaces revealed an increase in the number of functional groups and contact angle degree, respectively, compared to that of the untreated films. In addition, an in vitro experiment of mouse adipose-derived stem cells showed better growth and adhesion of the cells on the surface of plasma-treated PHBV film. Overall, these results reveal that plasma surface modifications are useful in biomaterial development.
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Affiliation(s)
- Chih-Kai Chang
- Biorefinery and Bioprocess Engineering Laboratory, Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135, Yuan-Tung Road, Chungli, Taoyuan 320, Taiwan.
| | - Hui-Min David Wang
- Graduate Institute of Biomedical Engineering, National Chung Hsing University, No. 145, Xing-Da Road, South District, Taichung 402, Taiwan.
| | - John Chi-Wei Lan
- Biorefinery and Bioprocess Engineering Laboratory, Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135, Yuan-Tung Road, Chungli, Taoyuan 320, Taiwan.
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28
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Gamerith C, Vastano M, Ghorbanpour SM, Zitzenbacher S, Ribitsch D, Zumstein MT, Sander M, Herrero Acero E, Pellis A, Guebitz GM. Enzymatic Degradation of Aromatic and Aliphatic Polyesters by P. pastoris Expressed Cutinase 1 from Thermobifida cellulosilytica. Front Microbiol 2017; 8:938. [PMID: 28596765 PMCID: PMC5443175 DOI: 10.3389/fmicb.2017.00938] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 05/09/2017] [Indexed: 11/13/2022] Open
Abstract
To study hydrolysis of aromatic and aliphatic polyesters cutinase 1 from Thermobifida cellulosilytica (Thc_Cut1) was expressed in P. pastoris. No significant differences between the expression of native Thc_Cut1 and of two glycosylation site knock out mutants (Thc_Cut1_koAsn and Thc_Cut1_koST) concerning the total extracellular protein concentration and volumetric activity were observed. Hydrolysis of poly(ethylene terephthalate) (PET) was shown for all three enzymes based on quantification of released products by HPLC and similar concentrations of released terephthalic acid (TPA) and mono(2-hydroxyethyl) terephthalate (MHET) were detected for all enzymes. Both tested aliphatic polyesters poly(butylene succinate) (PBS) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were hydrolyzed by Thc_Cut1 and Thc_Cut1_koST, although PBS was hydrolyzed to significantly higher extent than PHBV. These findings were also confirmed via quartz crystal microbalance (QCM) analysis; for PHBV only a small mass change was observed while the mass of PBS thin films decreased by 93% upon enzymatic hydrolysis with Thc_Cut1. Although both enzymes led to similar concentrations of released products upon hydrolysis of PET and PHBV, Thc_Cut1_koST was found to be significantly more active on PBS than the native Thc_Cut1. Hydrolysis of PBS films by Thc_Cut1 and Thc_Cut1_koST was followed by weight loss and scanning electron microscopy (SEM). Within 96 h of hydrolysis up to 92 and 41% of weight loss were detected with Thc_Cut1_koST and Thc_Cut1, respectively. Furthermore, SEM characterization of PBS films clearly showed that enzyme tretment resulted in morphological changes of the film surface.
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Affiliation(s)
| | - Marco Vastano
- Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences ViennaTulln, Austria.,Dipartimento di Scienze Chimiche, Universita degli Studi di Napoli Federico IINaples, Italy
| | - Sahar M Ghorbanpour
- Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences ViennaTulln, Austria
| | | | - Doris Ribitsch
- Austrian Centre of Industrial BiotechnologyTulln, Austria.,Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences ViennaTulln, Austria
| | - Michael T Zumstein
- Institute of Biogeochemistry and Pollutant Dynamics, ETH ZurichZurich, Switzerland
| | - Michael Sander
- Institute of Biogeochemistry and Pollutant Dynamics, ETH ZurichZurich, Switzerland
| | | | - Alessandro Pellis
- Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences ViennaTulln, Austria
| | - Georg M Guebitz
- Austrian Centre of Industrial BiotechnologyTulln, Austria.,Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences ViennaTulln, Austria
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29
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Enrique-Jimenez P, Vega JF, Martínez-Salazar J, Ania F, Flores A. Mapping the Mechanical Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Banded Spherulites by Nanoindentation. Polymers (Basel) 2016; 8:polym8100358. [PMID: 30974634 PMCID: PMC6432475 DOI: 10.3390/polym8100358] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 10/04/2016] [Accepted: 10/07/2016] [Indexed: 11/16/2022] Open
Abstract
Nanoindentation provides clear evidence that spherulite banding can be associated with a continuous modulation of mechanical properties from the more compliant peaks to the stiffer valleys. The structural arrangement in polymer-banded spherulites has intrigued scientists for many decades, and the debate has been recently intensified with the advent of new experimental evidence. The present paper approaches this issue by exploring the local mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-ringed spherulites via nanoindentation and discussing the confidence of the results. It was found that storage modulus and hardness across the banding morphology can be described as a sequence of regular oscillations with a periodicity that exactly matches the one observed using optical and atomic force microscopy. Results are consistent with the model of regular twisting of the lamellae, with flat-on arrangement in the low regions and edge-on lamellae in the crests.
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Affiliation(s)
- Patricia Enrique-Jimenez
- Department of Macromolecular Physics, Institute for the Structure of Matter (IEM-CSIC), Serrano 119 and 113bis, 28006 Madrid, Spain.
| | - Juan F Vega
- Department of Macromolecular Physics, Institute for the Structure of Matter (IEM-CSIC), Serrano 119 and 113bis, 28006 Madrid, Spain.
| | - Javier Martínez-Salazar
- Department of Macromolecular Physics, Institute for the Structure of Matter (IEM-CSIC), Serrano 119 and 113bis, 28006 Madrid, Spain.
| | - Fernando Ania
- Department of Macromolecular Physics, Institute for the Structure of Matter (IEM-CSIC), Serrano 119 and 113bis, 28006 Madrid, Spain.
| | - Araceli Flores
- Department of Macromolecular Physics, Institute for the Structure of Matter (IEM-CSIC), Serrano 119 and 113bis, 28006 Madrid, Spain.
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30
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Antonova LV, Sevostyanova VV, Kutikhin AG, Mironov AV, Krivkina EO, Shabaev AR, Matveeva VG, Velikanova EA, Sergeeva EA, Burago AY, Vasyukov GY, Glushkova TV, Kudryavtseva YA, Barbarash OL, Barbarash LS. Vascular Endothelial Growth Factor Improves Physico-Mechanical Properties and Enhances Endothelialization of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Poly(ε-caprolactone) Small-Diameter Vascular Grafts In vivo. Front Pharmacol 2016; 7:230. [PMID: 27524968 PMCID: PMC4965475 DOI: 10.3389/fphar.2016.00230] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 07/15/2016] [Indexed: 12/21/2022] Open
Abstract
The combination of a natural polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and a synthetic hydrophobic polymer poly(ε-caprolactone) (PCL) is promising for the preparation of biodegradable and biocompatible small-diameter vascular grafts for bypass surgery. However, physico-mechanical properties and endothelialization rate of PHBV/PCL grafts are poor. We suggested that incorporation of vascular endothelial growth factor (VEGF) into PHBV/PCL grafts may improve their physico-mechanical properties and enhance endothelialization. Here we compared morphology, physico-mechanical properties, and in vivo performance of electrospun small-diameter vascular grafts prepared from PHBV/PCL with and without VEGF. Structure of the graft surface and physico-mechanical properties were examined by scanning electron microscopy and universal testing machine, respectively. Grafts were implanted into rat abdominal aorta for 1, 3, and 6 months with the further histological, immunohistochemical, and immunofluorescence examination. PHBV/PCL grafts with and without VEGF were highly porous and consisted mostly of nanoscale and microscale fibers, respectively. Mean pore diameter and mean pore area were significantly lower in PHBV/PCL/VEGF compared to PHBV/PCL grafts (1.47 μm and 10.05 μm(2); 2.63 μm and 47.13 μm(2), respectively). Durability, elasticity, and stiffness of PHBV/PCL grafts with VEGF were more similar to internal mammary artery compared to those without, particularly 6 months postimplantation. Both qualitative examination and quantitative image analysis showed that three-fourths of PHBV/PCL grafts with VEGF were patent and had many CD31-, CD34-, and vWF-positive cells at their inner surface. However, all PHBV/PCL grafts without VEGF were occluded and had no or a few CD31-positive cells at the inner surface. Therefore, VEGF enhanced endothelialization and improved graft patency at all the time points in a rat abdominal aorta replacement model. In conclusion, PHBV/PCL grafts with VEGF have better biocompatibility and physico-mechanical properties compared to those without. Incorporation of VEGF improves graft patency and accelerates formation of endothelial cell monolayer.
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Affiliation(s)
- Larisa V Antonova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | | | - Anton G Kutikhin
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Andrey V Mironov
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Evgeniya O Krivkina
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Amin R Shabaev
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Vera G Matveeva
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Elena A Velikanova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Evgeniya A Sergeeva
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Andrey Y Burago
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Georgiy Y Vasyukov
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Tatiana V Glushkova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | | | - Olga L Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Leonid S Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
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31
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Antonova LV, Seifalian AM, Kutikhin AG, Sevostyanova VV, Krivkina EO, Mironov AV, Burago AY, Velikanova EA, Matveeva VG, Glushkova TV, Sergeeva EA, Vasyukov GY, Kudryavtseva YA, Barbarash OL, Barbarash LS. Bioabsorbable Bypass Grafts Biofunctionalised with RGD Have Enhanced Biophysical Properties and Endothelialisation Tested In vivo. Front Pharmacol 2016; 7:136. [PMID: 27252652 PMCID: PMC4879758 DOI: 10.3389/fphar.2016.00136] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 05/10/2016] [Indexed: 01/01/2023] Open
Abstract
Small diameter arterial bypass grafts are considered as unmet clinical need since the current grafts have poor patency of 25% within 5 years. We have developed a 3D scaffold manufactured from natural and synthetic biodegradable polymers, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(𝜀-caprolactone) (PCL), respectively. Further to improve the biophysical properties as well as endothelialisation, the grafts were covalently conjugated with arginine-glycine-aspartic acid (RGD) bioactive peptides. The biophysical properties as well as endothelialisation of PHBV/PCL and PCL 2 mm diameter bypass grafts were assessed with and without biofunctionalisation with RGD peptides in vitro and in vivo. Morphology of the grafts was assessed by scanning electron microscopy, whereas physico-mechanical properties were evaluated using a physiological circulating system equipped with a state of art ultrasound vascular wall tracking system. Endothelialisation of the grafts in vitro and in vivo were assessed using a cell viability assay and rat abdominal aorta replacement model, respectively. The biofunctionalisation with RGD bioactive peptides decreased mean fiber diameter and mean pore area in PHBV/PCL grafts; however, this was not the case for PCL grafts. Both PHBV/PCL and PCL grafts with RGD peptides had lower durability compared to those without; these durability values were similar to those of internal mammary artery. Modification of PHBV/PCL and PCL grafts with RGD peptides increased endothelial cell viability in vitro by a factor of eight and enhanced the formation of an endothelial cell monolayer in vivo 1 month postimplantation. In conclusion, PHBV/PCL small-caliber graft can be a suitable 3D scaffold for the development of a tissue engineering arterial bypass graft.
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Affiliation(s)
- Larisa V Antonova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Alexander M Seifalian
- Centre for Nanotechnology and Regenerative Medicine, UCL Division of Surgery and Interventional Science, University College LondonLondon, UK; NanoRegMed LtdLondon, UK
| | - Anton G Kutikhin
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | | | - Evgeniya O Krivkina
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Andrey V Mironov
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Andrey Y Burago
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Elena A Velikanova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Vera G Matveeva
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Tatiana V Glushkova
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Evgeniya A Sergeeva
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Georgiy Y Vasyukov
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | | | - Olga L Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
| | - Leonid S Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases Kemerovo, Russia
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Ivanov SY, Bonartsev AP, Gazhva YV, Zharkova II, Mukhametshin RF, Mahina TK, Myshkina VL, Bonartseva GA, Voinova VV, Andreeva NV, Akulina EA, Kharitonova ES, Shaitan KV, Muraev AA. [Development and preclinical studies of insulating membranes based on poly-3-hydroxybutyrate-co-3-hydroxyvalerate for guided bone regeneration]. Biomed Khim 2016; 61:717-23. [PMID: 26716743 DOI: 10.18097/pbmc20156106717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Bone tissue damages are one of the dominant causes of temporary disability and developmental disability. Currently, there are some methods of guided bone regeneration employing different osteoplastic materials and insulation membranes used in surgery. In this study, we have developed a method of preparation of porous membranes from the biopolymer poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV), produced by a strain of Azotobacter chroococcum 7B. The biocompatibility of the porous membranes was investigated in vitro using mesenchymal stem cells (MSCs) and in vivo on laboratory animals. The cytotoxicity test showed the possibility of cell attachment on membrane and histological studies confirmed good insulating properties the material. The data obtained demonstrate the high biocompatibility and the potential application of insulating membranes based on PHBV in bone tissue engineering.
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Affiliation(s)
- S Yu Ivanov
- Nizhny Novgorod State Medical Academy, Nizhny Novgorod, Russia
| | - A P Bonartsev
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia; Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | - Yu V Gazhva
- Nizhny Novgorod State Medical Academy, Nizhny Novgorod, Russia
| | - I I Zharkova
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | | | - T K Mahina
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | - V L Myshkina
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | - G A Bonartseva
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | - V V Voinova
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - N V Andreeva
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | - E A Akulina
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - E S Kharitonova
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - K V Shaitan
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - A A Muraev
- Nizhny Novgorod State Medical Academy, Nizhny Novgorod, Russia
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Bhatia SK, Yi DH, Kim HJ, Jeon JM, Kim YH, Sathiyanarayanan G, Seo HM, Lee JH, Kim JH, Park K, Brigham CJ, Yang YH. Overexpression of succinyl-CoA synthase for poly (3-hydroxybutyrate-co-3-hydroxyvalerate) production in engineered Escherichia coli BL21(DE3). J Appl Microbiol 2015; 119:724-35. [PMID: 26109231 DOI: 10.1111/jam.12880] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 06/04/2015] [Accepted: 06/11/2015] [Indexed: 01/27/2023]
Abstract
AIM This study aims to increase the 3-hydroxyvalerate (3HV) fraction in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(HB-co-HV)] using succinyl-CoA synthase. METHODS AND RESULTS Escherichia coli YH090, a polyhydroxyalkonate (PHA)-producing strain, was further engineered for overexpression of succinyl-CoA synthase genes (sucCD), and examined for P(HB-co-HV) copolymer production in the presence of various precursor molecules using mixture analysis. Glycerol, succinate and propionate were screened as important factors for controlling intracellular PHA accumulation and monomer composition. Glycerol concentrations exerted the greatest influence on the overall biomass concentration and the intracellular PHA content, while propionate concentrations in the presence of succinate influenced the 3HV content of the copolymer. Mixture analysis also demonstrated that the engineered strain has the capacity to accumulate up to 80% of its cell dry weight (CDW) as PHA with a variable fraction of 3HV monomer (maximum of 72 wt %) depending on the controlled conditions. CONCLUSIONS Propionate is the principal precursor for 3HV monomer in P(HB-co-HV) biopolymer and its utilization requires conversion to propionyl-CoA. Engineered E. coli YHY99, overexpressing sucCD genes, leads to an increase of the succinyl-CoA pool, which enhances the conversion rate of propionate by providing a CoA supply to other acyltransferase enzymes that have a role in propionate utilization. SIGNIFICANCE AND IMPACT OF THE STUDY Engineered E. coli YHY99 was able to utilize propionate with a 4·5-fold increase in rate, as compared to the control strain, and resulted in the synthesis of a copolymer with high 3HV monomer content.
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Affiliation(s)
- S K Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - D-H Yi
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - H-J Kim
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - J-M Jeon
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - Y-H Kim
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - G Sathiyanarayanan
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - H M Seo
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - J H Lee
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - J-H Kim
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - K Park
- Department of Biological and Chemical Engineering, Hongik University, Jochiwon, Sejong City, Korea
| | - C J Brigham
- Department of Bioengineering, University of Massachusetts Dartmouth, North Dartmouth, MA, USA
| | - Y-H Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea.,Institute for Ubiquitous Information Technology and Applications (CBRU), Konkuk University, Seoul, South Korea
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Biazar E, Keshel SH, Pouya M, Rad H, Nava MO, Azarbakhsh M, Hooshmand S. Nanofibrous nerve conduits for repair of 30-mm-long sciatic nerve defects. Neural Regen Res 2014; 8:2266-74. [PMID: 25206536 PMCID: PMC4146035 DOI: 10.3969/j.issn.1673-5374.2013.24.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 06/08/2013] [Indexed: 11/18/2022] Open
Abstract
It has been confirmed that nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nerve conduit can promote peripheral nerve regeneration in rats. However, its efficiency in repair of over 30-mm-long sciatic nerve defects needs to be assessed. In this study, we used a nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nerve conduit to bridge a 30-mm-long gap in the rat sciatic nerve. At 4 months after nerve conduit implantation, regenerated nerves were cally observed and histologically assessed. In the nanofibrous graft, the rat sciatic nerve trunk had been reconstructed by restoration of nerve continuity and formation of myelinated nerve fiber. There were Schwann cells and glial cells in the regenerated nerves. Masson's trichrome staining showed that there were no pathological changes in the size and structure of gastrocnemius muscle cells on the operated side of rats. These findings suggest that nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nerve conduit is suitable for repair of long-segment sciatic nerve defects.
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Affiliation(s)
- Esmaeil Biazar
- Department of Biomaterial Engineering, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Saeed Heidari Keshel
- Student Research Committee, Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Majid Pouya
- Department of Medical Sciences, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Hadi Rad
- Department of Medical Sciences, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Melody Omrani Nava
- Department of Medical Sciences, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Mohammad Azarbakhsh
- Faculty of Medical Sciences, Babol University of Medical Sciences, Babol, Iran
| | - Shirin Hooshmand
- Faculty of Medical Sciences, Babol University of Medical Sciences, Babol, Iran
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Biazar E, Keshel SH, Pouya M. Efficacy of nanofibrous conduits in repair of long-segment sciatic nerve defects. Neural Regen Res 2013; 8:2501-9. [PMID: 25206560 PMCID: PMC4145933 DOI: 10.3969/j.issn.1673-5374.2013.27.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 07/16/2013] [Indexed: 01/03/2023] Open
Abstract
Our previous studies have histomorphologically confirmed that nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) conduit can be used to repair 30-mm-long sciatic nerve defects. However, the repair effects on rat behaviors remain poorly understood. In this study, we used nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) conduit and autologous sciatic nerve to bridge 30-mm-long rat sciatic nerve gaps. Within 4 months after surgery, rat sciatic nerve functional recovery was evaluated per month by behavioral analyses, including toe out angle, toe spread analysis, walking track analysis, extensor postural thrust, swimming test, open-field analysis and nociceptive function. Results showed that rat sciatic nerve functional recovery was similar after nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) conduit and autologous nerve grafting. These findings suggest that nanofibrous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) conduit is suitable in use for repair of long-segment sciatic nerve defects.
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Affiliation(s)
- Esmaeil Biazar
- Department of Biomaterial Engineering, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Saeed Heidari Keshel
- Student Research Committee, Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Majid Pouya
- Faculty of Medical Sciences, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
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Versace DL, Ramier J, Grande D, Andaloussi SA, Dubot P, Hobeika N, Malval JP, Lalevee J, Renard E, Langlois V. Versatile photochemical surface modification of biopolyester microfibrous scaffolds with photogenerated silver nanoparticles for antibacterial activity. Adv Healthc Mater 2013; 2:1008-18. [PMID: 23299982 DOI: 10.1002/adhm.201200269] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 11/26/2012] [Indexed: 12/29/2022]
Abstract
A straightforward and versatile method for immobilizing macromolecules and silver nanoparticles on the surface of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) electrospun fibers is developed with the objective of designing a new functional material having significant antibacterial activity. The approach relies on a two-step procedure: UV photografting of poly(methacrylic acid) (PMAA) on the surface of PHBHV fibers according to a "grafting from" method, and complexation of in situ photogenerated silver nanoparticles (Ag NPs) by carboxyl groups from tethered PMAA chains. The photografting process is conducted through a photoinduced free-radical process employing a ketone-based photoinitiator in aqueous medium. Under appropriate conditions, the photogenerated radicals abstract hydrogen atoms from the PHBHV backbone, thus initiating the UV-mediated photopolymerization of MAA from the PHBHV microfibrous surface. The photochemical mechanism of the ketone photolysis is entirely described by the electron spin resonance/spin-trapping technique, and the modified PHBHV microfibrous scaffold is extensively characterized by ATR-FTIR spectroscopy, water contact-angle measurements, and mercury intrusion porosimetry. In a second step, the in situ synthesis of Ag NPs within the microfibrous scaffold is implemented by photoreduction reaction in the presence of both a silver precursor and a photosensitizer. The photoinduced formation of Ag NPs is confirmed by UV spectrophotometry and XPS analysis. SEM and TEM experiments confirm the formation and dispersion of Ag NPs on the surface of the modified fibers. Finally, a primary investigation is conducted to support the antibacterial activity of the new functionalized biomaterial against Staphylococcus aureus and Escherichia coli.
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