301
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Long H, Wu Z, Dong Q, Shen Y, Zhou W, Luo Y, Zhang C, Dong X. Mechanical and thermal properties of bamboo fiber reinforced polypropylene/polylactic acid composites for 3D printing. POLYM ENG SCI 2018. [DOI: 10.1002/pen.25043] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Haibo Long
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Zhiqiang Wu
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Qianqian Dong
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Yuting Shen
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Wuyi Zhou
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Ying Luo
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Chaoqun Zhang
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
| | - Xianming Dong
- Biomass 3D Printing Materials Research Center; College of Materials and Energy, South China Agricultural University; Guangzhou 510642 China
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302
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Akindoyo JO, Beg MDH, Ghazali S, Alam AKMM, Heim HP, Feldmann M. Synergized poly(lactic acid)-hydroxyapatite composites: Biocompatibility study. J Appl Polym Sci 2018. [DOI: 10.1002/app.47400] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- John O. Akindoyo
- Faculty of Chemical and Natural Resources Engineering; Universiti Malaysia Pahang; Lebuhraya Tun Razak, Gambang 26300 Kuantan Pahang Malaysia
- Center of Excellence for Advanced Research in Fluid Flow; Universiti Malaysia Pahang; Lebuhraya Tun Razak Gambang 26300 Kuantan Pahang Malaysia
- Institute of Materials Engineering; University of Kassel; MönchebergStreet - 3, 34125 Kassel Germany
- School of Materials & Mineral Resources Engineering; Engineering Campus, Universiti Sains Malaysia; 14300 Nibong Tebal Pulau Pinang Malaysia
| | - Mohammad D. H. Beg
- Faculty of Chemical and Natural Resources Engineering; Universiti Malaysia Pahang; Lebuhraya Tun Razak, Gambang 26300 Kuantan Pahang Malaysia
- Center of Excellence for Advanced Research in Fluid Flow; Universiti Malaysia Pahang; Lebuhraya Tun Razak Gambang 26300 Kuantan Pahang Malaysia
| | - Suriati Ghazali
- Faculty of Chemical and Natural Resources Engineering; Universiti Malaysia Pahang; Lebuhraya Tun Razak, Gambang 26300 Kuantan Pahang Malaysia
| | - A. K. M. M. Alam
- Faculty of Chemical and Natural Resources Engineering; Universiti Malaysia Pahang; Lebuhraya Tun Razak, Gambang 26300 Kuantan Pahang Malaysia
| | - Hans P. Heim
- Institute of Materials Engineering; University of Kassel; MönchebergStreet - 3, 34125 Kassel Germany
| | - Maik Feldmann
- Institute of Materials Engineering; University of Kassel; MönchebergStreet - 3, 34125 Kassel Germany
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303
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Souza Jr. FG, Soares BG, Silveira F, Renukappa N, Siddaramaiah S. Dielectric Behavior of SBS/Polyaniline Thermally Processable Blends. CHEMISTRY & CHEMICAL TECHNOLOGY 2018. [DOI: 10.23939/chcht12.04.441] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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304
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Physico-Mechanical, Thermal and Biodegradation Performance of Random Flax/Polylactic Acid and Unidirectional Flax/Polylactic Acid Biocomposites. FIBERS 2018. [DOI: 10.3390/fib6040098] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Fully biodegradable flax/polylactic acid (PLA) thermoplastic composites were fabricated by using random (nonwoven mat) and aligned (unidirectional yarn) flax fiber as reinforcements (39% flax by volume) and Polylactic acid (PLA) as matrix. Results revealed that the aligned flax fibers have a greater reinforcing effect due to the uniform distribution of load axially along the fiber length in the composite. The aligned flax/PLA and random flax/PLA showed the tensile strength of (83.0 ± 5.0) and (151.0 ± 7.0) MPa respectively and flexural strength of (130.0 ± 5.0) and (215.0 ± 7.2) MPa respectively. Young’s modulus of (9.3 ± 1.5) and (18.5 ± 2.0) GPa and flexural modulus of (9.9 ± 1.0) and (18.8 ± 1.0) GPa was attained for the random and unidirectional fiber composites, respectively. It was also found that both composite constituents, fiber and matrix, were degradable if buried in compost soil (ready soil after composting process), which is a distinctive advantage of the new composite structures. Remarkably, the biodegradation property of aligned flax fiber composites was significantly lower than random mat composites, possibly due to the less water swelling behavior of the aligned fiber composites. After 120 days burial test, the aligned flax/PLA composite displayed the reduction of 19% mass, residual flexural strength and modulus decreased by 57 and 50% respectively, while the random mat composites exhibited the loss of 27% mass, residual flexural strength and modulus declined by 80% at the same period.
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305
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Segura González EA, Olmos D, Lorente MÁ, Vélaz I, González-Benito J. Preparation and Characterization of Polymer Composite Materials Based on PLA/TiO₂ for Antibacterial Packaging. Polymers (Basel) 2018; 10:E1365. [PMID: 30961290 PMCID: PMC6401929 DOI: 10.3390/polym10121365] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 12/06/2018] [Accepted: 12/06/2018] [Indexed: 01/25/2023] Open
Abstract
Polymer composite materials based on polylactic acid (PLA) filled with titanium dioxide (TiO₂) nanoparticles were prepared. The aim of this work was to investigate the antibacterial action of TiO₂ against a strain of E. coli (DH5α) to obtain information on their potential uses in food and agro-alimentary industry. PLA/TiO₂ systems were prepared by a two-step process: Solvent casting followed by a hot-pressing step. Characterization was done as a function of particle size (21 nm and <100 nm) and particle content (0%, 1%, 5%, 10%, and 20%, wt %). Structural characterization carried out by X-ray diffraction (XRD) and Fourier Transformed Infrared spectroscopy (FTIR) did not reveal significant changes in polymer structure due to the presence of TiO₂ nanoparticles. Thermal characterization indicated that thermal transitions, measured by differential scanning calorimetry (DSC), did not vary, irrespective of size or content, whereas thermogravimetric analysis (TGA) revealed a slight increase in the temperature of degradation with particle content. Bacterial growth and biofilm formation on the surface of the composites against DH5α Escherichia coli was studied. Results suggested that the presence of TiO₂ nanoparticles decreases the amount of extracellular polymeric substance (EPS) and limits bacterial growth. The inhibition distances estimated with the Kirby-Bauer were doubled when 1% TiO₂ nanoparticles were introduced in PLA, though no significant differences were obtained for higher contents in TiO₂ NPs.
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Affiliation(s)
- Edwin A Segura González
- Universidad Interamericana de Panamá, Research Direction (DI-UIP 6338000), Av. Ricardo J. Alfaro, Panama City, Panama.
- Department of Materials Science and Engineering and Chemical Engineering, Instituto de Química y Materiales Álvaro Alonso Barba (IQMAA), Universidad Carlos III de Madrid, Leganés 28911, Madrid, Spain.
| | - Dania Olmos
- Department of Materials Science and Engineering and Chemical Engineering, Instituto de Química y Materiales Álvaro Alonso Barba (IQMAA), Universidad Carlos III de Madrid, Leganés 28911, Madrid, Spain.
| | - Miguel Ángel Lorente
- Department of Materials Science and Engineering and Chemical Engineering, Instituto de Química y Materiales Álvaro Alonso Barba (IQMAA), Universidad Carlos III de Madrid, Leganés 28911, Madrid, Spain.
| | - Itziar Vélaz
- Departamento de Química, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Navarra, Spain.
| | - Javier González-Benito
- Department of Materials Science and Engineering and Chemical Engineering, Instituto de Química y Materiales Álvaro Alonso Barba (IQMAA), Universidad Carlos III de Madrid, Leganés 28911, Madrid, Spain.
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306
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Yang JN, Xu YX, Nie SB, Cheng GJ, Tao YL, Zhu JB. Morphological structure, impact toughness, thermal property and kinetic analysis on the cold crystallization of poly (lactic acid) bio-composites toughened by precipitated barium sulfate. Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2018.11.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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307
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Scala A, Piperno A, Torcasio SM, Nicosia A, Mineo PG, Grassi G. “Clickable” polylactic acids obtained by solvent free intra-chain amidation. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.10.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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308
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Zaharescu T, Râpă M, Lungulescu EM, Butoi N. Filler effect on the degradation of γ-processed PLA/vinyl POSS hybrid. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2018.09.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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309
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Towards polylactide/core-shell rubber blends with balanced stiffness and toughness via the formation of rubber particle network with the aid of stereocomplex crystallites. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.11.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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310
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Willberg-Keyriläinen P, Orelma H, Ropponen J. Injection Molding of Thermoplastic Cellulose Esters and Their Compatibility with Poly(Lactic Acid) and Polyethylene. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E2358. [PMID: 30477116 PMCID: PMC6316932 DOI: 10.3390/ma11122358] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 11/19/2018] [Accepted: 11/21/2018] [Indexed: 11/16/2022]
Abstract
Interest in biobased polymers from renewable resources has grown in recent years due to environmental concerns, but they still have a minimal fraction of the total global market. In this study, the injection molding of thermoplastic cellulose octanate (cellulose C8) and cellulose palmitate (cellulose C16) were studied. The mechanical properties of injection-molded test specimens were analyzed by using tensile testing, and the internal structure of injection-molded objects was studied by using a field emission scanning electron microscopy (FE-SEM). We showed that thermoplastic cellulose C8 and cellulose C16 were completely processable without the addition of a plasticizer, which is very unusual in the case of cellulose esters. The compatibility of cellulose esters with poly(lactic acid) (PLA) and biopolyethylene (bio-PE) was also tested. By compounding the cellulose esters with PLA, the elongation of PLA-based blends could be improved and the density could be reduced. The tested thermoplastic cellulose materials were fully biobased, and have good future potential to be used in injection molding applications.
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Affiliation(s)
- Pia Willberg-Keyriläinen
- VTT Technical Research Centre of Finland Ltd., Tietotie 4E, P.O. Box 1000, FI-02044 VTT, FI-02150 Espoo, Finland.
| | - Hannes Orelma
- VTT Technical Research Centre of Finland Ltd., Tietotie 4E, P.O. Box 1000, FI-02044 VTT, FI-02150 Espoo, Finland.
| | - Jarmo Ropponen
- VTT Technical Research Centre of Finland Ltd., Tietotie 4E, P.O. Box 1000, FI-02044 VTT, FI-02150 Espoo, Finland.
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311
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1,3-Propanediol and its Application in Bio-Based Polyesters for Resin Applications. CHEMISTRY AFRICA 2018. [DOI: 10.1007/s42250-018-0026-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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312
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Hamad K, Kaseem M, Ayyoob M, Joo J, Deri F. Polylactic acid blends: The future of green, light and tough. Prog Polym Sci 2018. [DOI: 10.1016/j.progpolymsci.2018.07.001] [Citation(s) in RCA: 183] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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313
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Alzate Marin JC, Rivero S, Pinotti A, Caravelli A, Zaritzky NE. Microstructural Behaviors of Matrices Based on Polylactic Acid and Polyhydroxyalkanoates. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:10033-10040. [PMID: 30036472 DOI: 10.1021/acs.jafc.8b01506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Individual films of polyhydroxyalkanoates (PHA) and polylactic acid (PLA) and their blends were developed by solvent casting. PHA was obtained from activated sludges from a wastewater-treatment system at a laboratory scale. This work focused on analyzing the microstructural properties and thermal behaviors of individual films of PHA and PLA as well as those of their blends. The behaviors of the biodegradation processes of the individual films and blends were examined from a microstructural point of view. ATR-FTIR spectra indicated the existence of weak molecular interactions between the polymers. The formulation of blend films improved the crystallinity of PLA; additionally, it induced the polymer-recrystallization phenomenon, because crystallized PHA acted as a PLA-nucleating agent. This phenomenon explains the improvements in the films' water-vapor-barrier properties. The blends exposed to a biodegradation process showed an intermediate behavior between PLA and PHA, leading to a consistent basis for designing systems tailored to a particular purpose.
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Affiliation(s)
- Juan Carlos Alzate Marin
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Universidad Nacional de La Plata (UNLP), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) , 47 y 116 S/N , La Plata B1900AJJ , Buenos Aires , Argentina
| | - Sandra Rivero
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Universidad Nacional de La Plata (UNLP), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) , 47 y 116 S/N , La Plata B1900AJJ , Buenos Aires , Argentina
- Facultad de Ciencias Exactas , Universidad Nacional de La Plata (UNLP) , La Plata B1900AJJ , Buenos Aires , Argentina
| | - Adriana Pinotti
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Universidad Nacional de La Plata (UNLP), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) , 47 y 116 S/N , La Plata B1900AJJ , Buenos Aires , Argentina
- Facultad de Ingeniería , Universidad Nacional de La Plata (UNLP) , La Plata B1900AJJ , Buenos Aires , Argentina
| | - Alejandro Caravelli
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Universidad Nacional de La Plata (UNLP), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) , 47 y 116 S/N , La Plata B1900AJJ , Buenos Aires , Argentina
| | - Noemí Elisabet Zaritzky
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Universidad Nacional de La Plata (UNLP), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) , 47 y 116 S/N , La Plata B1900AJJ , Buenos Aires , Argentina
- Facultad de Ingeniería , Universidad Nacional de La Plata (UNLP) , La Plata B1900AJJ , Buenos Aires , Argentina
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314
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Recent Advances in Nanocomposites Based on Aliphatic Polyesters: Design, Synthesis, and Applications in Regenerative Medicine. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8091452] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the last decade, biopolymer matrices reinforced with nanofillers have attracted great research efforts thanks to the synergistic characteristics derived from the combination of these two components. In this framework, this review focuses on the fundamental principles and recent progress in the field of aliphatic polyester-based nanocomposites for regenerative medicine applications. Traditional and emerging polymer nanocomposites are described in terms of polymer matrix properties and synthesis methods, used nanofillers, and nanocomposite processing and properties. Special attention has been paid to the most recent nanocomposite systems developed by combining alternative copolymerization strategies with specific nanoparticles. Thermal, electrical, biodegradation, and surface properties have been illustrated and correlated with the nanoparticle kind, content, and shape. Finally, cell-polymer (nanocomposite) interactions have been described by reviewing analysis methodologies such as primary and stem cell viability, adhesion, morphology, and differentiation processes.
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315
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Torres-Hernández YG, Ortega-Díaz GM, Téllez-Jurado L, Castrejón-Jiménez NS, Altamirano-Torres A, García-Pérez BE, Balmori-Ramírez H. Biological Compatibility of a Polylactic Acid Composite Reinforced with Natural Chitosan Obtained from Shrimp Waste. MATERIALS 2018; 11:ma11081465. [PMID: 30126167 PMCID: PMC6119920 DOI: 10.3390/ma11081465] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 06/01/2018] [Accepted: 06/01/2018] [Indexed: 01/04/2023]
Abstract
The aim of this work is to evaluate the effect of chitosan content (1, 3 and 5 wt %) dispersed in polylactic acid (PLA) on the structure and properties of composites. Also, the hydrolytic degradation, and the cell viability and adhesion of human MG-63 osteoblasts are analyzed to determine the composites’ suitability for use in tissue engineering. For the manufacture of the materials, natural chitosan was extracted chemically from shrimp exoskeleton. The composites were fabricated by extrusion, because it is a low-cost process, it is reproducible, and it does not compromise the biocompatibility of the materials. FT-IR and XRD show that the chitosan does not change the polymer structure, and interactions between the composite components are discarded. In vitro degradation tests show that the composites do not induce significant pH changes in phosphate buffer solution due to their low susceptibility to hydrolytic degradation. The adhesion and morphological characteristics of the osteoblasts are evaluated using confocal microscopy and scanning electron microscopy. The cell viability is determined by the MTT assay. Osteoblasts adhesion is observed on the surface of PLA and composites. A higher amount of chitosan, higher number of cells with osteoblastic morphology, and mineralized nodules are observed on the composite surface. The highest metabolic activity is evidenced at 21 days. The results suggest that the Polylactic acid/chitosan composites are potentially suitable for use as a biomaterial.
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Affiliation(s)
- Yaret Gabriela Torres-Hernández
- Department of Metallurgical and Materials Engineering, Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE), Instituto Politécnico Nacional, Unidad Profesional Adolfo López Mateos (UPALM), Av. Instituto Politécnico Nacional S/N, C.P., Ciudad de México 07738, Mexico.
| | - Gloria Michel Ortega-Díaz
- Escuela Nacional de Ciencias Biológicas (ENCB), Department of Microbiology, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala S/N, Casco de Santo Tomás. C.P., Ciudad de México 11340, Mexico.
| | - Lucía Téllez-Jurado
- Department of Metallurgical and Materials Engineering, Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE), Instituto Politécnico Nacional, Unidad Profesional Adolfo López Mateos (UPALM), Av. Instituto Politécnico Nacional S/N, C.P., Ciudad de México 07738, Mexico.
| | - Nayeli Shantal Castrejón-Jiménez
- Escuela Nacional de Ciencias Biológicas (ENCB), Department of Microbiology, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala S/N, Casco de Santo Tomás. C.P., Ciudad de México 11340, Mexico.
| | - Alejandro Altamirano-Torres
- Department of Materials, Universidad Autónoma Metropolitana-Azcapotzalco, San Pablo No.180, Col. Reynosa-Tamaulipas, C.P., Ciudad de México 02200, Mexico.
| | - Blanca Estela García-Pérez
- Escuela Nacional de Ciencias Biológicas (ENCB), Department of Microbiology, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala S/N, Casco de Santo Tomás. C.P., Ciudad de México 11340, Mexico.
| | - Heberto Balmori-Ramírez
- Department of Metallurgical and Materials Engineering, Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE), Instituto Politécnico Nacional, Unidad Profesional Adolfo López Mateos (UPALM), Av. Instituto Politécnico Nacional S/N, C.P., Ciudad de México 07738, Mexico.
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316
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Iordanskii A, Zhulkina A, Olkhov A, Fomin S, Burkov A, Stilman M. Characterization and Evaluation of Controlled Antimicrobial Release from Petrochemical (PU) and Biodegradable (PHB) Packaging. Polymers (Basel) 2018; 10:E817. [PMID: 30960742 PMCID: PMC6403705 DOI: 10.3390/polym10080817] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/09/2018] [Accepted: 07/17/2018] [Indexed: 12/31/2022] Open
Abstract
The academic exploration and technology design of active packaging are coherently supplying innovative approaches for enhancing the quality and safety of food, as well as prolonging their shelf-life. With the object of comparison between two barrier materials, such as stable petrochemical polyurethane (PU), (BASF), and biodegradable natural poly(3-hydroxybutyrate) (PHB), (Biomer Co., Krailling, Germany), the study of antibacterial agent release has been performed. For the characterization of polymer surface morphology and crystallinity, the scanning electron microscopy (SEM), atomic force microscopy (AFM) and differential scanning calorimetry (DSC) were used respectively. The antimicrobial activity of chlorhexidine digluconate (CHD) has been estimated by the Bauer⁻Kirby Disk Diffusion Test. It was shown that the kinetic release profiles of CHD, as the active agent, in both polymers, significantly differed due to the superposition of diffusion and surface degradation in poly(3-hydroxybutyrate) (PHB). To emphasize the special transport phenomena in polymer packaging, the diffusivity modeling was performed and the CHD diffusion coefficients for the plane films of PU and PHB were further compared. The benefit of active biodegradable packaging on the base of PHB is discussed.
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Affiliation(s)
- Alexey Iordanskii
- Semenov Institute of Chemical Physics, Kosygin Str. 4, 119991 Moscow, Russia.
| | - Anna Zhulkina
- Semenov Institute of Chemical Physics, Kosygin Str. 4, 119991 Moscow, Russia.
| | - Anatoliy Olkhov
- Semenov Institute of Chemical Physics, Kosygin Str. 4, 119991 Moscow, Russia.
- Polymer Chemistry Department, Plekhanov Russian University of Economics, Stremyannyy Pereulok, 36, 115093 Moskva, Russia.
| | - Sergey Fomin
- Vyatskiy State University, Moskovskaya ul. 36, 610000 Kirov, Russia.
| | - Andrey Burkov
- Vyatskiy State University, Moskovskaya ul. 36, 610000 Kirov, Russia.
| | - Mikhail Stilman
- Mendeleev University of Chemical Technology of Russia, 9, Miusskaya sq., 125047 Moscow, Russia.
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317
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Mbarki K, Boumbimba RM, Sayari A, Elleuch B. Influence of microfibers length on PDLA/cellulose microfibers biocomposites crystallinity and properties. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2431-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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318
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Rocha DB, Souza de Carvalho J, de Oliveira SA, dos Santos Rosa D. A new approach for flexible PBAT/PLA/CaCO3films into agriculture. J Appl Polym Sci 2018. [DOI: 10.1002/app.46660] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Daniel Belchior Rocha
- Environmentally Friendly Polymer Laboratory, Centro de Engenharia; Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Avenida dos Estados; Santo André SP 5001 Brazil
| | - Jéssika Souza de Carvalho
- Environmentally Friendly Polymer Laboratory, Centro de Engenharia; Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Avenida dos Estados; Santo André SP 5001 Brazil
| | - Sueli Aparecida de Oliveira
- Environmentally Friendly Polymer Laboratory, Centro de Engenharia; Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Avenida dos Estados; Santo André SP 5001 Brazil
| | - Derval dos Santos Rosa
- Environmentally Friendly Polymer Laboratory, Centro de Engenharia; Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Avenida dos Estados; Santo André SP 5001 Brazil
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319
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Arrieta M, López de Dicastillo C, Garrido L, Roa K, Galotto M. Electrospun PVA fibers loaded with antioxidant fillers extracted from Durvillaea antarctica algae and their effect on plasticized PLA bionanocomposites. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.04.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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320
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Hu H, Zhang R, Wang J, Ying WB, Zhu J. Fully bio-based poly(propylene succinate-co-propylene furandicarboxylate) copolyesters with proper mechanical, degradation and barrier properties for green packaging applications. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.03.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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321
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The role of lignin on the mechanical performance of polylactic acid and jute composites. Int J Biol Macromol 2018; 116:299-304. [PMID: 29698765 DOI: 10.1016/j.ijbiomac.2018.04.124] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 04/17/2018] [Accepted: 04/23/2018] [Indexed: 11/21/2022]
Abstract
The present work shows the feasibility of incorporating properly treated jute strands into a polylactic acid (PLA) thermoplastic matrix. The role of lignin in the interaction between jute strands and PLA was assessed by means of gradually decreasing the amount of lignin and producing composites. Five different lignin contents were studied and the resulting strands were incorporated into the PLA matrix at the ratio of 30 wt%. Composites were produced in a discontinuous extruder and standard specimens were injected and characterized at tensile. It was found that as the amount of lignin was decreased, the interface between the matrix and the reinforcement was properly improved, since tensile strength was increased up to 46% and FTIR analysis revealed the existence of H-bonds however they cannot be clearly related with an interaction between both phases. Both macro and micromechanical analysis showed that jute strands with a lignin content of 4% were the most suitable to be used as PLA reinforcement, mainly due to their higher intrinsic mechanical properties, better interaction with PLA and dispersion within the matrix. Overall, it was found that it is possible to obtain high-performance bio-based and presumably biodegradable composites with potential to substitute current oil-based commodities.
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322
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Composite PLA/PEG/nHA/Dexamethasone Scaffold Prepared by 3D Printing for Bone Regeneration. Macromol Biosci 2018; 18:e1800068. [DOI: 10.1002/mabi.201800068] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 03/20/2018] [Indexed: 11/07/2022]
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323
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Luo Y, Cao Y, Guo G. Effects of TiO2
nanoparticles on the photodegradation of poly(lactic acid). J Appl Polym Sci 2018. [DOI: 10.1002/app.46509] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yanbing Luo
- School of History and Culture; Center for Archaeological Science, Sichuan University; Chengdu 610064 China
| | - Yuzhen Cao
- School of History and Culture; Center for Archaeological Science, Sichuan University; Chengdu 610064 China
| | - Gang Guo
- State Key Laboratory of Biotherapy and Cancer Center; West China Hospital, West China Medical School, Sichuan University; Chengdu 610065 China
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324
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Lin J, Yang Z, Hu X, Hong G, Zhang S, Song W. The Effect of Alkali Treatment on Properties of Dopamine Modification of Bamboo Fiber/Polylactic Acid Composites. Polymers (Basel) 2018; 10:polym10040403. [PMID: 30966437 PMCID: PMC6415265 DOI: 10.3390/polym10040403] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/20/2018] [Accepted: 03/27/2018] [Indexed: 11/23/2022] Open
Abstract
In this study, a synergistic treatment including dopamine (DA) modification and alkali pretreatment on bamboo fiber (BF) was used as reinforcement in a polylactic acid (PLA) matrix to improve the mechanical and thermal properties of BF/PLA composites. The effects of the sodium hydroxide loading rate on the performance of mussel-inspired dopamine-modified bamboo fiber and the BF/PLA composites were evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), mechanical testing (examining flexural, tensile, and impact properties), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Analysis of the composites suggested that the optimal condition was treatment with a 4 wt % solution of NaOH and a 1 wt % concentration of dopamine. Compared with the untreated bamboo fiber/polylactic acid composites, the synergistic treatment improved the thermal properties and mechanical properties; flexural, tensile, and impact strengths increased by 16.1%, 34.4%, and 3.7%, respectively. It was further verified that appropriate alkali treatment was a promising approach in promoting the effect of dopamine-modified coating while maintaining the crystal structure of the cellulose.
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Affiliation(s)
- Jianyong Lin
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Zexun Yang
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Xiaoxia Hu
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Gonghua Hong
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Shuangbao Zhang
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Wei Song
- Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
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325
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Stueckle TA, Davidson DC, Derk R, Kornberg TG, Battelli L, Friend S, Orandle M, Wagner A, Dinu CZ, Sierros KA, Agarwal S, Gupta RK, Rojanasakul Y, Porter DW, Rojanasakul L. Short-Term Pulmonary Toxicity Assessment of Pre- and Post-incinerated Organomodified Nanoclay in Mice. ACS NANO 2018; 12:2292-2310. [PMID: 29451776 PMCID: PMC6357971 DOI: 10.1021/acsnano.7b07281] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Organomodified nanoclays (ONCs) are increasingly used as filler materials to improve nanocomposite strength, wettability, flammability, and durability. However, pulmonary risks associated with exposure along their chemical lifecycle are unknown. This study's objective was to compare pre- and post-incinerated forms of uncoated and organomodified nanoclays for potential pulmonary inflammation, toxicity, and systemic blood response. Mice were exposed via aspiration to low (30 μg) and high (300 μg) doses of preincinerated uncoated montmorillonite nanoclay (CloisNa), ONC (Clois30B), their respective incinerated forms (I-CloisNa and I-Clois30B), and crystalline silica (CS). Lung and blood tissues were collected at days 1, 7, and 28 to compare toxicity and inflammation indices. Well-dispersed CloisNa caused a robust inflammatory response characterized by neutrophils, macrophages, and particle-laden granulomas. Alternatively, Clois30B, I-Clois30B, and CS high-dose exposures elicited a low grade, persistent inflammatory response. High-dose Clois30B exposure exhibited moderate increases in lung damage markers and a delayed macrophage recruitment cytokine signature peaking at day 7 followed by a fibrotic tissue signature at day 28, similar to CloisNa. I-CloisNa exhibited acute, transient inflammation with quick recovery. Conversely, high-dose I-Clois30B caused a weak initial inflammatory signal but showed comparable pro-inflammatory signaling to CS at day 28. The data demonstrate that ONC pulmonary toxicity and inflammatory potential relies on coating presence and incineration status in that coated and incinerated nanoclay exhibited less inflammation and granuloma formation than pristine montmorillonite. High doses of both pre- and post-incinerated ONC, with different surface morphologies, may harbor potential pulmonary health hazards over long-term occupational exposures.
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Affiliation(s)
- Todd A. Stueckle
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Donna C. Davidson
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Ray Derk
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Tiffany G. Kornberg
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
- Department of Basic Pharmaceutical Sciences, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Lori Battelli
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Sherri Friend
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Marlene Orandle
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Alixandra Wagner
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Cerasela Zoica Dinu
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Konstantinos A. Sierros
- Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Sushant Agarwal
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Rakesh K. Gupta
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Yon Rojanasakul
- Department of Basic Pharmaceutical Sciences, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Dale W. Porter
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
| | - Liying Rojanasakul
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, United States
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326
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Supercritical CO 2 impregnation of PLA/PCL films with natural substances for bacterial growth control in food packaging. Food Res Int 2018; 107:486-495. [PMID: 29580511 DOI: 10.1016/j.foodres.2018.02.065] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 02/03/2018] [Accepted: 02/25/2018] [Indexed: 12/13/2022]
Abstract
Biodegradable polymers with antibacterial properties are highly desirable materials for active food packaging applications. Thymol, a dietary monoterpene phenol with a strong antibacterial activity is abundant in plants belonging to the genus Thymus. This study presents two approaches for supercritical CO2 impregnation of poly(lactic acid)(PLA)/poly(ε-caprolactone)(PCL) blended films to induce antibacterial properties of the material: (i) a batch impregnation process for loading pure thymol, and (ii) an integrated supercritical extraction-impregnation process for isolation of thyme extract and its incorporation into the films, operated in both batch or semi-continuous modes with supercritical solution circulation. The PCL content in films, impregnation time and CO2 flow regime were varied to maximize loading of the films with thymol or thyme extract with preserving films' structure and thermal stability. Representative film samples impregnated with thymol and thyme extract were tested against Gram (-) (Escherichia coli) and Gram(+) (Bacillus subtilis) model strains, by measuring their metabolic activity and re-cultivation after exposure to the films. The film containing thymol (35.8 wt%) showed a strong antibacterial activity leading to a total reduction of bacterial cell viability. Proposed processes enable fast, controlled and organic solvent-free fabrication of the PLA/PCL films containing natural antibacterial substances at moderately low temperature, with a compact structure and a good thermal stability, for potential use as active food packaging materials.
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327
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Bher A, Uysal Unalan I, Auras R, Rubino M, Schvezov CE. Toughening of Poly(lactic acid) and Thermoplastic Cassava Starch Reactive Blends Using Graphene Nanoplatelets. Polymers (Basel) 2018; 10:E95. [PMID: 30966131 PMCID: PMC6415146 DOI: 10.3390/polym10010095] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 01/12/2018] [Accepted: 01/15/2018] [Indexed: 01/15/2023] Open
Abstract
Poly(lactic acid) (PLA) was reactively blended with thermoplastic cassava starch (TPCS) and functionalized with commercial graphene (GRH) nanoplatelets in a twin-screw extruder, and films were produced by cast-film extrusion. Reactive compatibilization between PLA and TPCS phases was reached by introducing maleic anhydride and a peroxide radical during the reactive blending extrusion process. Films with improved elongation at break and toughness for neat PLA and PLA-g-TPCS reactive blends were obtained by an addition of GRH nanoplatelets. Toughness of the PLA-g-TPCS-GRH was improved by ~900% and ~500% when compared to neat PLA and PLA-g-TPCS, respectively. Crack bridging was established as the primary mechanism responsible for the improvement in the mechanical properties of PLA and PLA-g-TPCS in the presence of the nanofiller due to the high aspect ratio of GRH. Scanning electron microscopy images showed a non-uniform distribution of GRH nanoplatelets in the matrix. Transmittance of the reactive blend films decreased due to the TPCS phase. Values obtained for the reactive blends showed ~20% transmittance. PLA-GRH and PLA-g-TPCS-GRH showed a reduction of the oxygen permeability coefficient with respect to PLA of around 35% and 50%, respectively. Thermal properties, molecular structure, surface roughness, XRD pattern, electrical resistivity, and color of the films were also evaluated. Biobased and compostable reactive blend films of PLA-g-TPCS compounded with GRH nanoplatelets could be suitable for food packaging and agricultural applications.
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Affiliation(s)
- Anibal Bher
- School of Packaging, Michigan State University, East Lansing, MI 48824, USA.
- Instituto Sabato, UNSAM-CNEA, San Martin, Buenos Aires 1650, Argentina.
- Instituto de Materiales de Misiones (IMAM), CONICET-UNaM, Posadas, Misiones 3300, Argentina.
| | - Ilke Uysal Unalan
- School of Packaging, Michigan State University, East Lansing, MI 48824, USA.
- Department of Food Engineering, Faculty of Engineering, İzmir University of Economics, İzmir 35330, Turkey.
| | - Rafael Auras
- School of Packaging, Michigan State University, East Lansing, MI 48824, USA.
| | - Maria Rubino
- School of Packaging, Michigan State University, East Lansing, MI 48824, USA.
| | - Carlos E Schvezov
- Instituto de Materiales de Misiones (IMAM), CONICET-UNaM, Posadas, Misiones 3300, Argentina.
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328
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Bher A, Auras R, Schvezov CE. Improving the toughening in poly(lactic acid)-thermoplastic cassava starch reactive blends. J Appl Polym Sci 2017. [DOI: 10.1002/app.46140] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Anibal Bher
- School of Packaging; Michigan State University; East Lansing Michigan USA, 48824
- Instituto Sabato, UNSAM-CNEA; San Martin Buenos Aires Argentina
- Instituto de Materiales de Misiones (IMAM), CONICET-UNaM; Posadas Misiones Argentina
| | - Rafael Auras
- School of Packaging; Michigan State University; East Lansing Michigan USA, 48824
| | - Carlos E. Schvezov
- Instituto de Materiales de Misiones (IMAM), CONICET-UNaM; Posadas Misiones Argentina
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329
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Kawaguchi H, Ogino C, Kondo A. Microbial conversion of biomass into bio-based polymers. BIORESOURCE TECHNOLOGY 2017; 245:1664-1673. [PMID: 28688739 DOI: 10.1016/j.biortech.2017.06.135] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 05/19/2023]
Abstract
The worldwide market for plastics is rapidly growing, and plastics polymers are typically produced from petroleum-based chemicals. The overdependence on petroleum-based chemicals for polymer production raises economic and environmental sustainability concerns. Recent progress in metabolic engineering has expanded fermentation products from existing aliphatic acids or alcohols to include aromatic compounds. This diversity provides an opportunity to expand the development and industrial uses of high-performance bio-based polymers. However, most of the biomonomers are produced from edible sugars or starches that compete directly with food and feed uses. The present review focuses on recent progress in the microbial conversion of biomass into bio-based polymers, in which fermentative products from renewable feedstocks serve as biomonomers for the synthesis of bio-based polymers. In particular, the production of biomonomers from inedible lignocellulosic feedstocks by metabolically engineered microorganisms and the synthesis of bio-based engineered plastics from the biological resources are discussed.
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Affiliation(s)
- Hideo Kawaguchi
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Chiaki Ogino
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Akihiko Kondo
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan; Biomass Engineering Research Division, RIKEN, 1-7-22 Suehiro, Turumi, Yokohama, Kanagawa 230-0045, Japan.
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330
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Shah AM, Kadir MRA, Razak SIA. Novel PLA-Based Conductive Polymer Composites for Biomedical Applications. JOM 2017; 69:2838-2843. [DOI: 10.1007/s11837-017-2577-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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331
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Granados-Hernández MV, Serrano-Bello J, Montesinos JJ, Alvarez-Gayosso C, Medina-Velázquez LA, Alvarez-Fregoso O, Alvarez-Perez MA. In vitro and in vivo biological characterization of poly(lactic acid) fiber scaffolds synthesized by air jet spinning. J Biomed Mater Res B Appl Biomater 2017; 106:2435-2446. [PMID: 29193687 DOI: 10.1002/jbm.b.34053] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 11/03/2017] [Accepted: 11/12/2017] [Indexed: 12/14/2022]
Abstract
Poly(lactic acid) (PLA) is one of the most promising renewable and biodegradable polymers for mimic extracellular matrix for tissue engineering applications. In this work, PLA spun membrane scaffold were successfully prepared by air jet spinning technology. Morphology, mechanical properties, in vitro biocompatibility, and in vitro and in vivo degradation of PLA fibrous scaffold were characterized by X-ray diffraction, Fourier Transform Infrared, and scanning electron microscope (SEM). Morphological results assessed by SEM analyses indicated that PLA scaffolds possessed an average fiber diameter of approximately 0.558 ± 0.141 µm for 7% w/v of PLA and approximately 0.647 ± 0.137 µm for 10% w/v. Interestingly, our results showed that the nanofiber size of PLA scaffold allow structural stability after 100 days of in vitro degradation in Ringer solution where the average fiber diameter were of approximately 0.633 ± 0.147 µm for 7% w/v and approximately 0.645 ± 0.140 µm for 10% w/v of PLA. Mechanical properties of PLA fibers scaffold after in vitro degradation showed decrease in terms of flexibility elongation, and less energy was needed to achieve maximal elastic deformation. The fiber size exerts an influence on the biological response of human Bone Marrow Mesenchymal Stromal Cells as confirmed by MTT assay after 9 days of cell culture and the in vivo degradation assay of 7% w/v and 10% w/v of PLA scaffold, did not demonstrate evidence of toxicity with a mild inflammatory respond. In conclusion, airbrushing technology promises to be a viable and attractive alternative technique for producing a biocompatible PLA nanofiber scaffold that could be considered for tissue engineering regeneration. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2435-2446, 2018.
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Affiliation(s)
- Marco Vladimir Granados-Hernández
- Laboratorio de Bioingeniería de Tejidos; DEPeI, Facultad de Odontología, UNAM. Circuito Exterior s/n. Cd. Universitaria, 04510 Coyoacán, CDMX, México.,Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México; Av. Ciudad Universitaria 3000, C.P. 04360, Coyoacán, CDMX, México
| | - Janeth Serrano-Bello
- Laboratorio de Bioingeniería de Tejidos; DEPeI, Facultad de Odontología, UNAM. Circuito Exterior s/n. Cd. Universitaria, 04510 Coyoacán, CDMX, México
| | - Juan José Montesinos
- Mesenchymal Stem Cells Laboratory, Oncology Research Unit, Oncology Hospital, National Medical Center, IMSS, Mexico City, México
| | - Carlos Alvarez-Gayosso
- Laboratorio de Materiales Dentales; DEPeI, Facultad de Odontología, UNAM. Circuito Exterior s/n. Cd. Universitaria, 04510 Coyoacán, CDMX, México
| | - Luis Alberto Medina-Velázquez
- Instituto de Física, Universidad Nacional Autónoma de México, CDMX, 04510, México.,Unidad de Investigación Biomédica en Cáncer INCan/UNAM, Instituto Nacional de Cancerología, CDMX, 14080, México
| | - Octavio Alvarez-Fregoso
- Instituto de Investigaciones en Materiales, Circuito Exterior s/n. Cd. Universitaria, 04510 Coyoacán, CDMX, México
| | - Marco Antonio Alvarez-Perez
- Laboratorio de Bioingeniería de Tejidos; DEPeI, Facultad de Odontología, UNAM. Circuito Exterior s/n. Cd. Universitaria, 04510 Coyoacán, CDMX, México
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332
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Zhang C, Zhou C, Assavasirijinda N, Yu B, Wang L, Ma Y. Non-sterilized fermentation of high optically pure D-lactic acid by a genetically modified thermophilic Bacillus coagulans strain. Microb Cell Fact 2017; 16:213. [PMID: 29178877 PMCID: PMC5702109 DOI: 10.1186/s12934-017-0827-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/16/2017] [Indexed: 12/03/2022] Open
Abstract
Background Optically pure d-lactic acid (≥ 99%) is an important precursor of polylactic acid. However, there are relatively few studies on d-lactic acid fermentation compared with the extensive investigation of l-lactic acid production. Most lactic acid producers are mesophilic organisms. Optically pure d-lactic acid produced at high temperature not only could reduce the costs of sterilization but also could inhibit the growth of other bacteria, such as l-lactic acid producers. Results Thermophilic Bacillus coagulans is an excellent producer of l-lactic acid with capable of growing at 50 °C. In our previous study, the roles of two l-lactic acid dehydrogenases have been demonstrated in B. coagulans DSM1. In this study, the function of another annotated possible l-lactate dehydrogenase gene (ldhL3) was verified to be leucine dehydrogenase with an activity of 0.16 units (μmol/min) per mg protein. Furthermore, the activity of native d-lactate dehydrogenase was too low to support efficient d-lactic acid production, even under the control of strong promoter. Finally, an engineered B. coagulans D-DSM1 strain with the capacity for efficient production of d-lactic acid was constructed by deletion of two l-lactate dehydrogenases genes (ldhL1 and ldhL2) and insertion of the d-lactate dehydrogenase gene (LdldhD) from Lactobacillus delbrueckii subsp. bulgaricus DSM 20081 at the position of ldhL1. Conclusions This genetically engineered strain produced only d-lactic acid under non-sterilized condition, and finally 145 g/L of d-lactic acid was produced with an optical purity of 99.9% and a high yield of 0.98 g/g. This is the highest optically pure d-lactic acid titer produced by a thermophilic strain. Electronic supplementary material The online version of this article (10.1186/s12934-017-0827-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Caili Zhang
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Cheng Zhou
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Nilnate Assavasirijinda
- Department of Biology, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
| | - Bo Yu
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Limin Wang
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China.
| | - Yanhe Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
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333
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Pozo Morales A, Güemes A, Fernandez-Lopez A, Carcelen Valero V, De La Rosa Llano S. Bamboo-Polylactic Acid (PLA) Composite Material for Structural Applications. MATERIALS 2017; 10:ma10111286. [PMID: 29120398 PMCID: PMC5706233 DOI: 10.3390/ma10111286] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 10/24/2017] [Accepted: 11/03/2017] [Indexed: 11/16/2022]
Abstract
Developing an eco-friendly industry based on green materials, sustainable technologies, and optimum processes with low environmental impact is a general societal goal, but this remains a considerable challenge to achieve. Despite the large number of research on green structural composites, limited investigation into the most appropriate manufacturing methodology to develop a structural material at industrial level has taken place. Laboratory panels have been manufactured with different natural fibers but the methodologies and values obtained could not be extrapolated at industrial level. Bamboo industry panels have increased in the secondary structural sector such as building application, flooring and sport device, because it is one of the cheapest raw materials. At industrial level, the panels are manufactured with only the inner and intermediate region of the bamboo culm. However, it has been found that the mechanical properties of the external shells of bamboo culm are much better than the average cross-sectional properties. Thin strips of bamboo (1.5 mm thick and 1500 mm long) were machined and arranged with the desired lay-up and shape to obtain laminates with specific properties better than those of conventional E-Glass/Epoxy laminates in terms of both strength and stiffness. The strips of bamboo were bonded together by a natural thermoplastic polylactic acid (PLA) matrix to meet biodegradability requirements. The innovative mechanical extraction process developed in this study can extract natural strip reinforcements with high performance, low cost, and high rate, with no negative environmental impact, as no chemical treatments are used. The process can be performed at the industrial level. Furthermore, in order to validate the structural applications of the composite, the mechanical properties were analyzed under ageing conditions. This material could satisfy the requirements for adequate mechanical properties and life cycle costs at industrial sectors such as energy or automotive.
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Affiliation(s)
- Angel Pozo Morales
- Department of Aerospace Materials and Manufacturing, Polytechnic University of Madrid, 28031 Madrid, Spain.
| | - Alfredo Güemes
- Department of Aerospace Materials and Manufacturing, Polytechnic University of Madrid, 28031 Madrid, Spain.
| | - Antonio Fernandez-Lopez
- Department of Aerospace Materials and Manufacturing, Polytechnic University of Madrid, 28031 Madrid, Spain.
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334
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Therias S, Murariu M, Dubois P. Bionanocomposites based on PLA and halloysite nanotubes: From key properties to photooxidative degradation. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2017.06.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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335
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Ivanovic J, Rezwan K, Kroll S. Supercritical CO2
deposition and foaming process for fabrication of biopolyester-ZnO bone scaffolds. J Appl Polym Sci 2017. [DOI: 10.1002/app.45824] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jasna Ivanovic
- Faculty of Technology and Metallurgy, Department of Organic Chemical Technology; University of Belgrade, Karnegijeva 4; Belgrade 11000 Republic of Serbia
| | - Kurosch Rezwan
- Advanced Ceramics; University of Bremen, Am Biologischen Garten 2; Bremen 28359 Germany
- Centre for Materials and Processes (MAPEX); University of Bremen, Bibliothekstraße 1; Bremen 28359 Germany
| | - Stephen Kroll
- Advanced Ceramics; University of Bremen, Am Biologischen Garten 2; Bremen 28359 Germany
- Centre for Materials and Processes (MAPEX); University of Bremen, Bibliothekstraße 1; Bremen 28359 Germany
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Arrieta MP, Samper MD, Aldas M, López J. On the Use of PLA-PHB Blends for Sustainable Food Packaging Applications. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E1008. [PMID: 28850102 PMCID: PMC5615663 DOI: 10.3390/ma10091008] [Citation(s) in RCA: 203] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 08/21/2017] [Accepted: 08/24/2017] [Indexed: 02/03/2023]
Abstract
Poly(lactic acid) (PLA) is the most used biopolymer for food packaging applications. Several strategies have been made to improve PLA properties for extending its applications in the packaging field. Melt blending approaches are gaining considerable interest since they are easy, cost-effective and readily available processing technologies at the industrial level. With a similar melting temperature and high crystallinity, poly(hydroxybutyrate) (PHB) represents a good candidate to blend with PLA. The ability of PHB to act as a nucleating agent for PLA improves its mechanical resistance and barrier performance. With the dual objective to improve PLAPHB processing performance and to obtain stretchable materials, plasticizers are frequently added. Current trends to enhance PLA-PHB miscibility are focused on the development of composite and nanocomposites. PLA-PHB blends are also interesting for the controlled release of active compounds in the development of active packaging systems. This review explains the most relevant processing aspects of PLA-PHB based blends such as the influence of polymers molecular weight, the PLA-PHB composition as well as the thermal stability. It also summarizes the recent developments in PLA-PHB formulations with an emphasis on their performance with interest in the sustainable food packaging field. PLA-PHB blends shows highly promising perspectives for the replacement of traditional petrochemical based polymers currently used for food packaging.
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Affiliation(s)
- Marina Patricia Arrieta
- Institute of Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain.
| | - María Dolores Samper
- Instituto de Tecnología de Materiales, Universitat Politècnica de València, 03801 Alcoy-Alicante, Spain.
| | - Miguel Aldas
- Instituto de Tecnología de Materiales, Universitat Politècnica de València, 03801 Alcoy-Alicante, Spain.
- Departamento de Ciencia de Alimentos y Biotecnología, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional, Quito 170517, Ecuador.
| | - Juan López
- Instituto de Tecnología de Materiales, Universitat Politècnica de València, 03801 Alcoy-Alicante, Spain.
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Cortés JD, Carriazo JG, Sierra CA, Ochoa-Puentes C. Micro-composites based on polylactic acid with kaolinite or rice husk particles and their performance on water vapor permeability. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2017. [DOI: 10.1080/10601325.2017.1317580] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- José David Cortés
- Estado Sólido y Catálisis Ambiental (ESCA), Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá-Colombia
- Grupo de Investigación en Macromoléculas, Departamento de Química, Universidad Nacional de Colombia, Bogotá-Colombia
| | - José G. Carriazo
- Estado Sólido y Catálisis Ambiental (ESCA), Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá-Colombia
| | - Cesar A. Sierra
- Grupo de Investigación en Macromoléculas, Departamento de Química, Universidad Nacional de Colombia, Bogotá-Colombia
| | - Cristian Ochoa-Puentes
- Grupo de Investigación en Macromoléculas, Departamento de Química, Universidad Nacional de Colombia, Bogotá-Colombia
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338
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Effects of PLA Film Incorporated with ZnO Nanoparticle on the Quality Attributes of Fresh-Cut Apple. NANOMATERIALS 2017; 7:nano7080207. [PMID: 28758980 PMCID: PMC5575689 DOI: 10.3390/nano7080207] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Revised: 07/18/2017] [Accepted: 07/25/2017] [Indexed: 11/30/2022]
Abstract
A novel nanopackaging film was synthesized by incorporating ZnO nanoparticles into a poly-lactic acid (PLA) matrix, and its effect on the quality of fresh-cut apple during the period of preservation was investigated at 4 ± 1 °C for 14 days. Six wt % cinnamaldehyde was added into the nano-blend film. Scanning electron microscope (SEM) analysis showed a rougher cross-section of the nano-blend films and an X-ray diffraction (XRD) was carried out to determine the structure of the ZnO nanoparticles. Compared to the pure PLA film, the nano-blend film had a higher water vapor permeability (WVP) and lower oxygen permeability. With the increase of the nanoparticles (NPs) in the PLA, the elongation at break (ε) and elastic modulus (EM) increased, while tensile strength (TS) decreased. Thermogravimetric analysis (TGA) presented a relatively good thermostability. Most importantly, the physical and biochemical properties of the fresh-cut apple were also measured, such as weight loss, firmness, polyphenol oxidase (PPO), total phenolic content, browning index (BI), sensory quality, and microbiological level. The results indicated that nano-blend packaging films had the highest weight loss at the end of storage compared to the pure PLA film; however, nanopackaging provided a better retention of firmness, total phenolic countent, color, and sensory quality. It also had a remarkable inhibition on the growth of microorganisms. Therefore, Nano-ZnO active packaging could be used to improve the shelf-life of fresh-cut produce.
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339
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Demina TS, Bardakova KN, Minaev NV, Svidchenko EA, Istomin AV, Goncharuk GP, Vladimirov LV, Grachev AV, Zelenetskii AN, Timashev PS, Akopova TA. Two-Photon-Induced Microstereolithography of Chitosan-g-Oligolactides as a Function of Their Stereochemical Composition. Polymers (Basel) 2017; 9:E302. [PMID: 30970980 PMCID: PMC6432183 DOI: 10.3390/polym9070302] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/20/2017] [Accepted: 07/21/2017] [Indexed: 12/27/2022] Open
Abstract
Chitosan-g-oligolactide copolymers with relatively long oligolactide grafted chains of various stereochemical compositions have been synthetized via a solvent-free mechanochemical technique and tailored to fabricate three-dimensional hydrogels using two-photon induced microstereolithography. An effect of the characteristics of chitosan and oligolactide used for the synthesis on the grafting yield and copolymer's behavior were evaluated using fractional analysis, FTIR-spectroscopy, dynamic light scattering, and UV-spectrophotometry. The lowest copolymer yield was found for the system based on chitosan with higher molecular weight, while the samples consisting of low-molecular weight chitosan showed higher grafting degrees, which were comparable in both the cases of l,l- or l,d-oligolactide grafting. The copolymer processability in the course of two-photon stereolithography was evaluated as a function of the copolymer's characteristics and stereolithography conditions. The structure and mechanical properties of the model film samples and fabricated 3D hydrogels were studied using optical and scanning electron microscopy, as well as by using tensile and nanoindenter devices. The application of copolymer with oligo(l,d-lactide) side chains led to higher processability during two-photon stereolithography in terms of the response to the laser beam, reproduction of the digital model, and the mechanical properties of the fabricated hydrogels.
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Affiliation(s)
- Tatiana S Demina
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
| | - Kseniia N Bardakova
- Institute of Photonic Technologies, Research center "Crystallography and Photonics", Russian Academy of Sciences, 2 Pionerskaya str., Troitsk, Moscow 142190, Russia.
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., Moscow 119991, Russia.
| | - Nikita V Minaev
- Institute of Photonic Technologies, Research center "Crystallography and Photonics", Russian Academy of Sciences, 2 Pionerskaya str., Troitsk, Moscow 142190, Russia.
| | - Eugenia A Svidchenko
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
| | - Alexander V Istomin
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
| | - Galina P Goncharuk
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
| | - Leonid V Vladimirov
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina str., Moscow 119334, Russia.
| | - Andrey V Grachev
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina str., Moscow 119334, Russia.
| | - Alexander N Zelenetskii
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
| | - Peter S Timashev
- Institute of Photonic Technologies, Research center "Crystallography and Photonics", Russian Academy of Sciences, 2 Pionerskaya str., Troitsk, Moscow 142190, Russia.
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., Moscow 119991, Russia.
| | - Tatiana A Akopova
- Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russia.
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340
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Hu C, Louisy E, Fontaine G, Bonnet F. Cyclic versus linear polylactide: Straightforward access using a single catalyst. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28699] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chi Hu
- Unité de Catalyse et Chimie du Solide, CNRS, UMR 8181, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59655 France
- Unité Matériaux Et Transformation, CNRS, UMR 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59652 France
| | - Elodie Louisy
- Unité de Catalyse et Chimie du Solide, CNRS, UMR 8181, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59655 France
- Unité Matériaux Et Transformation, CNRS, UMR 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59652 France
| | - Gaëlle Fontaine
- Unité Matériaux Et Transformation, CNRS, UMR 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59652 France
| | - Fanny Bonnet
- Unité de Catalyse et Chimie du Solide, CNRS, UMR 8181, Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Université Lille 1; Villeneuve d'Ascq 59655 France
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341
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342
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Barletta M, Pizzi E, Puopolo M, Vesco S, Daneshvar-Fatah F. Thermal behavior of extruded and injection-molded poly(lactic acid)-talc engineered biocomposites: Effects of material design, thermal history, and shear stresses during melt processing. J Appl Polym Sci 2017. [DOI: 10.1002/app.45179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Barletta
- Dipartimento di Ingegneria; Università degli Studi Roma Tre; Via Vito Volterra 62 00146 Rome Italy
- Dipartimento di Ingegneria dell'Impresa; Università degli Studi di Roma Tor Vergata; Via del Politecnico 1 00133 Rome Italy
| | - E. Pizzi
- Dipartimento di Ingegneria dell'Impresa; Università degli Studi di Roma Tor Vergata; Via del Politecnico 1 00133 Rome Italy
| | - M. Puopolo
- Dipartimento di Ingegneria dell'Impresa; Università degli Studi di Roma Tor Vergata; Via del Politecnico 1 00133 Rome Italy
| | - S. Vesco
- Dipartimento di Ingegneria dell'Impresa; Università degli Studi di Roma Tor Vergata; Via del Politecnico 1 00133 Rome Italy
| | - F. Daneshvar-Fatah
- Polymer Technology Center, Department of Materials Science and Engineering; Texas A&M University; Reed-McDonald Building, 3003 TAMU, 575 Ross Street College Station Texas 77843
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343
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Study on the Preparation and Anisotropic Distribution of Mechanical Properties of Well-Aligned PMIA Nanofiber Mats Reinforced Composites. J CHEM-NY 2017. [DOI: 10.1155/2017/8274024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Well-aligned PMIA nanofiber mats were fabricated by electrospinning and then hot-pressing was used to produce PMIA nanofiber mats reinforced PLA matrix by layer-by-layer with the interlayer angles of 0, 45, and 90°. Orthogonal experimental design was employed to fix the effect of the hot-pressing parameters on the tensile strength of nanocomposites, and SEM was used to characterize the broken sections of the nanocomposites after tensile test. The optimized process parameters were achieved of pressure as 1000 Pa, temperature as 180°C, and time as 30 min. The SEM images of broken sections showed that the different laminate forms and the state of bearing load of nanofibers resulted in the different morphologies of broken sections. The break strength of PMIA/PLA nanocomposites with any of interlayer angles at different tensile testing directions was revealed as follows: axial > oblique > transverse, and the initial modulus also showed the same except the angle of 90° with the approach initial modulus at the axial and transverse directions. The maximum tensile strength and modulus of the nanocomposites were 17.12 MPa and 1642.17 MPa, respectively, of the axial tensile testing directions of the interlayer angle of 0°.
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344
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Preparation and characterization of electrospun alginate/PLA nanofibers as tissue engineering material by emulsion eletrospinning. J Mech Behav Biomed Mater 2017; 65:428-438. [DOI: 10.1016/j.jmbbm.2016.09.012] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 09/06/2016] [Accepted: 09/07/2016] [Indexed: 12/15/2022]
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345
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Poh PSP, Chhaya MP, Wunner FM, De-Juan-Pardo EM, Schilling AF, Schantz JT, van Griensven M, Hutmacher DW. Polylactides in additive biomanufacturing. Adv Drug Deliv Rev 2016; 107:228-246. [PMID: 27492211 DOI: 10.1016/j.addr.2016.07.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 07/25/2016] [Indexed: 01/25/2023]
Abstract
New advanced manufacturing technologies under the alias of additive biomanufacturing allow the design and fabrication of a range of products from pre-operative models, cutting guides and medical devices to scaffolds. The process of printing in 3 dimensions of cells, extracellular matrix (ECM) and biomaterials (bioinks, powders, etc.) to generate in vitro and/or in vivo tissue analogue structures has been termed bioprinting. To further advance in additive biomanufacturing, there are many aspects that we can learn from the wider additive manufacturing (AM) industry, which have progressed tremendously since its introduction into the manufacturing sector. First, this review gives an overview of additive manufacturing and both industry and academia efforts in addressing specific challenges in the AM technologies to drive toward AM-enabled industrial revolution. After which, considerations of poly(lactides) as a biomaterial in additive biomanufacturing are discussed. Challenges in wider additive biomanufacturing field are discussed in terms of (a) biomaterials; (b) computer-aided design, engineering and manufacturing; (c) AM and additive biomanufacturing printers hardware; and (d) system integration. Finally, the outlook for additive biomanufacturing was discussed.
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Affiliation(s)
- Patrina S P Poh
- Department of Experimental Trauma Surgery, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - Mohit P Chhaya
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.
| | - Felix M Wunner
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.
| | - Elena M De-Juan-Pardo
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.
| | - Arndt F Schilling
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany; Clinic for Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany.
| | - Jan-Thorsten Schantz
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - Martijn van Griensven
- Department of Experimental Trauma Surgery, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - Dietmar W Hutmacher
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia; Institute for Advanced Study, Technical University of Munich, Garching, Germany.
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346
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Passos MF, Fernández-Gutiérrez M, Vázquez-Lasa B, Román JS, Filho RM. PHEMA-PLLA semi-interpenetrating polymer networks: A study of their swelling kinetics, mechanical properties and cellular behavior. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.10.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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347
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Lee JW, In JH, Park JB, Shin J, Park JH, Sung BH, Sohn JH, Seo JH, Park JB, Kim SR, Kweon DH. Co-expression of two heterologous lactate dehydrogenases genes in Kluyveromyces marxianus for l-lactic acid production. J Biotechnol 2016; 241:81-86. [PMID: 27867078 DOI: 10.1016/j.jbiotec.2016.11.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 11/10/2016] [Accepted: 11/16/2016] [Indexed: 11/18/2022]
Abstract
Lactic acid (LA) is a versatile compound used in the food, pharmaceutical, textile, leather, and chemical industries. Biological production of LA is possible by yeast strains expressing a bacterial gene encoding l-lactate dehydrogenase (LDH). Kluyveromyces marxianus is an emerging non-conventional yeast with various phenotypes of industrial interest. However, it has not been extensively studied for LA production. In this study, K. marxianus was engineered to express and co-express various heterologous LDH enzymes that were reported to have different pH optimums. Specifically, three LDH enzymes originating from Staphylococcus epidermidis (SeLDH; optimal at pH 5.6), Lactobacillus acidophilus (LaLDH; optimal at pH 5.3), and Bos taurus (BtLDH; optimal at pH 9.8) were functionally expressed individually and in combination in K. marxianus, and the resulting strains were compared in terms of LA production. A strain co-expressing SeLDH and LaLDH (KM5 La+SeLDH) produced 16.0g/L LA, whereas the strains expressing those enzymes individually produced only 8.4 and 6.8g/L, respectively. This co-expressing strain produced 24.0g/L LA with a yield of 0.48g/g glucose in the presence of CaCO3. Our results suggest that co-expression of LDH enzymes with different pH optimums provides sufficient LDH activity under dynamic intracellular pH conditions, leading to enhanced production of LA compared to individual expression of the LDH enzymes.
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Affiliation(s)
- Jae Won Lee
- Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Jung Hoon In
- Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Joon-Bum Park
- Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Jonghyeok Shin
- Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Jin Hwan Park
- Biomaterials Lab, Samsung Advanced Institute of Technology, Yongin 446-712, Republic of Korea
| | - Bong Hyun Sung
- Korea Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Republic of Korea
| | - Jung-Hoon Sohn
- Korea Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Republic of Korea
| | - Jin-Ho Seo
- Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea
| | - Jin-Byoung Park
- Department of Food Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Soo Rin Kim
- School of Food Science and Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, 702-701, Republic of Korea.
| | - Dae-Hyuk Kweon
- Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
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348
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Preparation of Au Nanoclusters-Modified Polylactic Acid Fiber with Bright Red Fluorescence and its Use as Sensing Probe. J Fluoresc 2016; 27:287-292. [PMID: 27785651 DOI: 10.1007/s10895-016-1956-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 10/19/2016] [Indexed: 10/20/2022]
Abstract
In present work, the Au nanoclusters-modified polylactic acid fiber (PLA-Au NCs) with bright red fluorescence were fabricated by the encapsulation of Au nanoclusters (Au NCs) in the PLA fiber treated with H2O2. The Au25 nanoclusters stabilized by bovine serum albumin (BSA-Au NCs) were prepared via an improved "green" synthetic routine. With pretreatment of the PLA fiber in H2O2 concentration of 12 and 18 %, the as-prepared PLA-Au NCs exhibited brighter red emission with a strong peak centered at ~640 nm than BSA-Au NCs. The fluorescence can be quenched by nitric oxide (NO). A good linear relationship between the relative fluorescence quenching intensity of the as-prepared PLA-Au NCs and the concentration of NO can be obtained in the range of 0.0732 to 0.7320 mM, and the detection limit was 0.0070 mM.
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349
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PLA with Intumescent System Containing Lignin and Ammonium Polyphosphate for Flame Retardant Textile. Polymers (Basel) 2016; 8:polym8090331. [PMID: 30974606 PMCID: PMC6431874 DOI: 10.3390/polym8090331] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/26/2016] [Accepted: 08/29/2016] [Indexed: 11/21/2022] Open
Abstract
Using bio-based polymers to replace of polymers from petrochemicals in the manufacture of textile fibers is a possible way to improve sustainable development for the textile industry. Polylactic acid (PLA) is one of the available bio-based polymers. One way to improve the fire behavior of this bio-based polymer is to add an intumescent formulation mainly composed of acid and carbon sources. In order to optimize the amount of bio-based product in the final material composition, lignin from wood waste was selected as the carbon source. Different formulations of and/or ammonium polyphosphate (AP) were prepared by melt extrusion and then hot-pressed into sheets. The thermal properties (thermogravimetric analyses (TGA) and differential scanning calorimetry (DSC)) and fire properties (UL-94) were measured. The spinnability of the various composites was evaluated. The mechanical properties and physical aspect (microscopy) of PLA multifilaments with lignin (LK) were checked. A PLA multifilament with up to 10 wt % of intumescent formulation was processed, and the fire behavior of PLA fabrics with lignin/AP formulation was studied by cone calorimeter.
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350
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De Santis F, Volpe V, Pantani R. Effect of molding conditions on crystallization kinetics and mechanical properties of poly(lactic acid). POLYM ENG SCI 2016. [DOI: 10.1002/pen.24414] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Felice De Santis
- Department of Industrial Engineering; University of Salerno; Fisciano Salerno 84084 Italy
| | - Valentina Volpe
- Department of Industrial Engineering; University of Salerno; Fisciano Salerno 84084 Italy
| | - Roberto Pantani
- Department of Industrial Engineering; University of Salerno; Fisciano Salerno 84084 Italy
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