51
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Ghasemi SM, Alavifar SS. The role of physicochemical properties in the nanoprecipitation of cellulose acetate. Carbohydr Polym 2019; 230:115628. [PMID: 31887871 DOI: 10.1016/j.carbpol.2019.115628] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 11/14/2019] [Accepted: 11/14/2019] [Indexed: 12/18/2022]
Abstract
The cellulose acetate (CA) nanoparticles (NPs) were prepared via the nanoprecipitation technique. The effects of solvent mixture quality and order of addition on the size evolution of CA NPs were investigated. The size of CA NPs was reduced by decreasing the nonsolvent-solvent mixture interaction parameter (χNS-mS) and by increasing the polymer-solvent mixture interaction parameter (χP-mS). The NPs prepared by the method of addition of the polymer solution to the nonsolvent were smaller than those prepared by addition of the nonsolvent to the polymer solution. The very small CA NPs with the diameter of 37 nm and very narrow PdI of 0.045 were fabricated without using any surfactant and charged groups. The role of surface tension and osmotic pressure forces on the formation of NPs were discussed. The formation mechanism of NPs could be assigned to the rapid polymer precipitation and solidification (vitrification) of the nuclei.
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Affiliation(s)
- Seyed Morteza Ghasemi
- Faculty of Polymer Engineering, Sahand University of Technology, Sahand New Town, Tabriz, 5331817634, Iran; Institute of Polymeric Materials, Sahand University of Technology, Sahand New Town, Tabriz, 5331817634, Iran.
| | - Seyedeh Sepideh Alavifar
- Faculty of Polymer Engineering, Sahand University of Technology, Sahand New Town, Tabriz, 5331817634, Iran
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52
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Cellulose based materials for controlled release formulations of agrochemicals: A review of modifications and applications. J Control Release 2019; 316:105-115. [PMID: 31704109 DOI: 10.1016/j.jconrel.2019.11.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/01/2019] [Accepted: 11/01/2019] [Indexed: 11/22/2022]
Abstract
Controlled release formulations (CRFs) of agrochemicals have been attracted considerable attention due to their friendliness to environment. The commercial supporting materials for CRFs of agrochemicals are non-degradable, leading to secondary pollution issue. Cellulose, as the most abundant natural materials in the world, is regarded as one of the most ideal substitutes for non-degradable supporting materials thanks to its good biocompatibility and biodegradability. As raw cellulose materials suffer several problems, such as poor mechanical strength, fast release rate, etc., chemical modifications are commonly performed to improve their properties. In this review, modification methods of cellulose materials for CRFs of agrochemicals were introduced. The relationships between release rate and cellulose based materials were discussed in detail. The applications of cellulose materials for CRFs of agrochemicals were also expounded.
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53
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Milovanovic S, Markovic D, Ivanovic J. Added-value porous materials for controlled thymol release obtained by supercritical CO2 impregnation process. CELLULAR POLYMERS 2019. [DOI: 10.1177/0262489319872329] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
This study explores utilization of biodegradable and biocompatible polymers for controlled release of natural bioactive substance. For that purpose, poly(ε-caprolactone) (PCL) beads, cellulose acetate (CA) film, and poly lactic- co-glycolic acid (PLGA) flakes were impregnated with thymol by employing environmentally friendly process of supercritical carbon dioxide (scCO2) impregnation. At selected pressure and temperature, prolongation of operating time increased thymol loading. Pure scCO2 did not affect CA film with average pore diameter of approximately 3 µm, while it enabled change of PCL beads and PLGA flakes into foams with average pore diameter approximately 175 µm and 87 µm, respectively. Additionally to scCO2, thymol acted as a plasticizer increasing pore size of polymers up to three times. Kinetic of thymol release from selected samples was tested using phosphate buffer saline at 37°C and successfully described with Korsmeyer–Peppas, zero-order, first-order, and Higuchi models. The suggested method of PCL, CA, and PLGA supercritical impregnation led to development of porous, solvent free, added-value materials that release thymol in a controlled manner from 5 h to several days.
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Affiliation(s)
- Stoja Milovanovic
- Faculty of Technology and Metallurgy, University of Belgrade, Department of Organic Chemical Technology, Karnegijeva 4, Belgrade, Serbia
| | - Darka Markovic
- Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia
| | - Jasna Ivanovic
- Faculty of Technology and Metallurgy, University of Belgrade, Department of Organic Chemical Technology, Karnegijeva 4, Belgrade, Serbia
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54
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Supercritical impregnation of olive leaf extract to obtain bioactive films effective in cherry tomato preservation. Food Packag Shelf Life 2019. [DOI: 10.1016/j.fpsl.2019.100338] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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55
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Sorghum straw: Pulping and bleaching process optimization and synthesis of cellulose acetate. Int J Biol Macromol 2019; 135:877-886. [DOI: 10.1016/j.ijbiomac.2019.05.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 05/01/2019] [Accepted: 05/03/2019] [Indexed: 11/23/2022]
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56
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Gim S, Zhu Y, Seeberger PH, Delbianco M. Carbohydrate-based nanomaterials for biomedical applications. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2019; 11:e1558. [PMID: 31063240 DOI: 10.1002/wnan.1558] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/21/2019] [Accepted: 03/26/2019] [Indexed: 01/09/2023]
Abstract
Carbohydrates are abundant biomolecules, with a strong tendency to form supramolecular networks. A host of carbohydrate-based nanomaterials have been exploited for biomedical applications. These structures are based on simple mono- or disaccharides, as well as on complex, polymeric systems. Chemical modifications serve to tune the shapes and properties of these materials. In particular, carbohydrate-based nanoparticles and nanogels were used for drug delivery, imaging, and tissue engineering applications. Due to the reversible nature of the assembly, often based on a combination of hydrogen bonding and hydrophobic interactions, carbohydrate-based materials are valuable substrates for the creations of responsive systems. Herein, we review the current research on carbohydrate-based nanomaterials, with a particular focus on carbohydrate assembly. We will discuss how these systems are formed and how their properties are tuned. Particular emphasis will be placed on the use of carbohydrates for biomedical applications. This article is categorized under: Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
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Affiliation(s)
- Soeun Gim
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany.,Department of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Yuntao Zhu
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Peter H Seeberger
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany.,Department of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Martina Delbianco
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
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57
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Cejudo Bastante C, Cran M, Casas Cardoso L, Mantell Serrano C, Martínez de la Ossa E, Bigger S. Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.12.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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58
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Rojas A, Torres A, José Galotto M, Guarda A, Julio R. Supercritical impregnation for food applications: a review of the effect of the operational variables on the active compound loading. Crit Rev Food Sci Nutr 2019; 60:1290-1301. [PMID: 30729794 DOI: 10.1080/10408398.2019.1567459] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The scCO2-assisted impregnation process has arisen as an effective method to impregnate solid materials. Its multiple advantages include high diffusion, it allows to obtain free-solvent materials and to operate under low temperatures, which permits to process thermolabile solutes. These characteristics have allowed its application at industrial scale for the impregnation of wood with fungicides and in the last years for textile dyeing. Meanwhile, other numerous applications are still being studied at laboratory scale. One potential field of application corresponds to the food-related industry, which includes the use of scCO2-assisted impregnation process to develop active materials for food packaging and to generate food-grade materials loaded with nutraceuticals for functional food applications. In this framework, this article summarizes the advantages and the main drawbacks with the scCO2-assisted impregnation process. The effect of the processing variables of the scCO2-assisted impregnation process is discussed in terms of the incorporation of active compounds within polymer structures. Including the principles and description of the process and a review of the investigated systems for a better understanding.
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Affiliation(s)
- Adrián Rojas
- Laboratory of Membrane Separation Processes (LabProSeM) Department of Chemical Engineering, University of Santiago de Chile, Santiago, Chile.,Food Packaging Laboratory Department of Food Science and Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile, Santiago, Chile
| | - Alejandra Torres
- Food Packaging Laboratory Department of Food Science and Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile, Santiago, Chile
| | - María José Galotto
- Food Packaging Laboratory Department of Food Science and Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile, Santiago, Chile
| | - Abel Guarda
- Food Packaging Laboratory Department of Food Science and Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile, Santiago, Chile
| | - Romero Julio
- Laboratory of Membrane Separation Processes (LabProSeM) Department of Chemical Engineering, University of Santiago de Chile, Santiago, Chile
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59
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Kuska R, Milovanovic S, Frerich S, Ivanovic J. Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.10.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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60
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Milovanovic S, Markovic D, Mrakovic A, Kuska R, Zizovic I, Frerich S, Ivanovic J. Supercritical CO 2 - assisted production of PLA and PLGA foams for controlled thymol release. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:394-404. [PMID: 30889714 DOI: 10.1016/j.msec.2019.01.106] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 11/21/2018] [Accepted: 01/23/2019] [Indexed: 12/19/2022]
Abstract
Amorphous, medical grade poly(d,l-lactic acid) (PLA) and poly(d,l-lactic-co-glycolic acid) (PLGA) were used to develop systems for controlled release of a natural bioactive substance - thymol. Supercritical carbon dioxide (scCO2) was successfully used both as an impregnation medium for thymol incorporation into the polymer matrix and a foaming agent in a single-step batch process. Impregnation of samples using low to moderate scCO2 densities (273 kg/m3 and 630 kg/m3) and short processing times (2 h and 4 h) enabled thymol loading of 0.92%-6.62% and formation of microcellular foams upon system depressurization. Thymol effect on structural and thermal properties on foamed samples was proven by FTIR and DSC. The effect of CO2 under elevated pressure on the neat polymers was analysed by high pressure DSC. Foaming of polymers with lower molecular weight by CO2 of higher density yielded foams with smaller pores. All tested foams released thymol in a controlled manner in phosphate buffered saline (PBS) at 37 °C within 3 to 6 weeks. Higher loading and lower cell density favoured thymol release rate, while its concentration in PBS for the tested period depended on foam interaction with the medium. Representative PLGA foam sample with the highest thymol loading (6.62%) showed controlled thymol release within 72 h in mediums having pH values from 1.1 to 7.4.
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Affiliation(s)
- Stoja Milovanovic
- University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
| | - Darka Markovic
- University of Belgrade, Innovation Centre of Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
| | - Ana Mrakovic
- Vinča Institute of Nuclear Sciences, Department of Theoretical and Condensed Matter Physics, 11001 Belgrade, Serbia
| | - Robert Kuska
- Ruhr-University Bochum, Institute of Thermo and Fluid Dynamics, Universitätsstraβe 150, 44801 Bochum, Germany
| | - Irena Zizovic
- Wroclaw University of Science and Technology, Faculty of Chemistry, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Sulamith Frerich
- Ruhr-University Bochum, Institute of Thermo and Fluid Dynamics, Universitätsstraβe 150, 44801 Bochum, Germany
| | - Jasna Ivanovic
- University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia.
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61
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Harini K, Sukumar M. Development of cellulose-based migratory and nonmigratory active packaging films. Carbohydr Polym 2019; 204:202-213. [DOI: 10.1016/j.carbpol.2018.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 10/05/2018] [Accepted: 10/06/2018] [Indexed: 11/15/2022]
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62
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Barman BK, Roy K, Roy MN. Probing Inclusion Complexes of Pentoxifylline and Pralidoxim inside Cyclic Oligosaccharides by Physicochemical Methodologies. Z PHYS CHEM 2018. [DOI: 10.1515/zpch-2017-1020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Structurally different Molecules namely Pentoxifylline and Pralidoxim were chosen along with α-cyclodextrin and β-cyclodextrin to study host-guest inclusion phenomena. The formations of host guest inclusion complexes were confirmed by studying 1H-NMR spectra, FT-IR spectra, apparent molar volume and viscosity co-efficient. The stabilities of inclusion complexes were compared calculating the binding constant from UV-VIS spectroscopic study. The 1:1 stoichiometry of the inclusion complexes were also determined by analysing the Jobs plot and surface tension data. The values for Gibbs’ free energy were found negative for both the processes. Based on all the above experiments the inclusion processes were found feasible for both the compounds. These types of inclusion complexes are of high interest in the field of research and industry as these are used as drug delivery systems.
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Affiliation(s)
- Biraj Kumar Barman
- Department of Chemistry , University of North Bengal , Darjeeling 734013, India
| | - Kanak Roy
- Department of Chemistry , University of North Bengal , Darjeeling 734013, India
| | - Mahendra Nath Roy
- Department of Chemistry , University of North Bengal , Darjeeling 734013, India
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63
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Zizovic I, Senerovic L, Moric I, Adamovic T, Jovanovic M, Krusic MK, Misic D, Stojanovic D, Milovanovic S. Utilization of supercritical carbon dioxide in fabrication of cellulose acetate films with anti-biofilm effects against Pseudomonas aeruginosa and Staphylococcus aureus. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.05.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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64
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Sarkar K, Barman BK, Nath Roy M. Study to explore inclusion complexes of α- and β-cyclodextrin molecules with 3-octyl-1-methylimidazolium bromide with the manifestation of hydrophobic and hydrophilic interactions. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.07.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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65
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Barman BK, Barman S, Roy MN. Inclusion complexation between tetrabutylphosphonium methanesulfonate as guest and α- and β-cyclodextrin as hosts investigated by physicochemical methodology. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.148] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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66
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Marković D, Milovanović S, De Clerck K, Zizovic I, Stojanović D, Radetić M. Development of material with strong antimicrobial activity by high pressure CO2 impregnation of polyamide nanofibers with thymol. J CO2 UTIL 2018. [DOI: 10.1016/j.jcou.2018.04.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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67
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Pajnik J, Radetić M, Stojanovic DB, Jankovic-Častvan I, Tadic V, Stanković MV, Jovanović DM, Zizovic I. Functionalization of polypropylene, polyamide and cellulose acetate materials with pyrethrum extract as a natural repellent in supercritical carbon dioxide. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.02.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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68
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Barman BK, Rajbanshi B, Yasmin A, Roy MN. Exploring inclusion complexes of ionic liquids with α- and β- cyclodextrin by NMR, IR, mass, density, viscosity, surface tension and conductance study. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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69
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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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70
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Saha S, Roy A, Roy MN. Mechanistic Investigation of Inclusion Complexes of a Sulfa Drug with α- and β-Cyclodextrins. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02619] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Subhadeep Saha
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India
| | - Aditi Roy
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India
| | - Mahendra Nath Roy
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India
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71
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72
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Villegas C, Torres A, Rios M, Rojas A, Romero J, de Dicastillo CL, Valenzuela X, Galotto MJ, Guarda A. Supercritical impregnation of cinnamaldehyde into polylactic acid as a route to develop antibacterial food packaging materials. Food Res Int 2017; 99:650-659. [DOI: 10.1016/j.foodres.2017.06.031] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 06/13/2017] [Accepted: 06/17/2017] [Indexed: 01/20/2023]
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73
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Controlled release for crop and wood protection: Recent progress toward sustainable and safe nanostructured biocidal systems. J Control Release 2017; 262:139-150. [PMID: 28739450 DOI: 10.1016/j.jconrel.2017.07.025] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 07/15/2017] [Accepted: 07/17/2017] [Indexed: 12/13/2022]
Abstract
We review biocide delivery systems (BDS), which are designed to deter or control harmful organisms that damage agricultural crops, forests and forest products. This is a timely topic, given the growing socio-economical concerns that have motivated major developments in sustainable BDS. Associated designs aim at improving or replacing traditional systems, which often consist of biocides with extreme behavior as far as their solubility in water. This includes those that compromise or pollute soil and water (highly soluble or volatile biocides) or those that present low bioavailability (poorly soluble biocides). Major breakthroughs are sought to mitigate or eliminate consequential environmental and health impacts in agriculture and silviculture. Here, we consider the most important BDS vehicles or carriers, their synthesis, the environmental impact of their constituents and interactions with the active components together with the factors that affect their rates of release such as environmental factors and interaction of BDS with the crops or forest products. We put in perspective the state-of-the-art nanostructured carriers for controlled release, which need to address many of the challenges that exist in the application of BDS.
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74
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Torres A, Ilabaca E, Rojas A, Rodríguez F, Galotto MJ, Guarda A, Villegas C, Romero J. Effect of processing conditions on the physical, chemical and transport properties of polylactic acid films containing thymol incorporated by supercritical impregnation. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.01.019] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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75
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Cellulose Acetate Based Material with Antibacterial Properties Created by Supercritical Solvent Impregnation. INT J POLYM SCI 2017. [DOI: 10.1155/2017/8762649] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Supercritical CO2 was used as a green solvent and impregnation medium for loading cellulose acetate beads with carvacrol in order to obtain a biomaterial with antibacterial properties. Supercritical solvent impregnation was performed in a high-pressure view cell at temperature of 50°C and pressures of 10, 21, and 30 MPa with the processing time ranging from 2 to 18 h. The rate of impregnation increased with the pressure increase. However, maximum impregnation yield (round 60%) was not affected by the pressure applied. Selected samples of the impregnated cellulose acetate containing 6–60% of carvacrol were proven to have considerable antibacterial effect against Gram-positive and Gram-negative bacterial strains including methicillin-resistant Staphylococcus aureus which causes severe infections in humans and animals. In addition, cellulose acetate beads containing 6.0–33.6% of carvacrol were shown to have a porous structure with submicron pores which is of interest for the controlled delivery applications.
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76
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Ribeiro SD, -->Rodrigues Filho G, Meneguin AB, Prezotti FG, Boni FI, Cury BSF, Gremião MPD. Cellulose triacetate films obtained from sugarcane bagasse: Evaluation as coating and mucoadhesive material for drug delivery systems. Carbohydr Polym 2016; 152:764-774. [DOI: 10.1016/j.carbpol.2016.07.069] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 07/09/2016] [Accepted: 07/17/2016] [Indexed: 11/29/2022]
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77
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Leite LSF, Battirola LC, da Silva LCE, Gonçalves MDC. Morphological investigation of cellulose acetate/cellulose nanocrystal composites obtained by melt extrusion. J Appl Polym Sci 2016. [DOI: 10.1002/app.44201] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | | | - Maria do Carmo Gonçalves
- Institute of Chemistry, University of Campinas (UNICAMP); P.O. Box 6154 Campinas SP 13083-970 Brazil
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78
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Roy A, Saha S, Datta B, Roy MN. Insertion behavior of imidazolium and pyrrolidinium based ionic liquids into α and β-cyclodextrins: mechanism and factors leading to host–guest inclusion complexes. RSC Adv 2016. [DOI: 10.1039/c6ra19684e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The encapsulation of [BMIm]Cl and [BMP]Cl within α and β-cyclodextrin in both the solid state and aqueous solution with 1 : 1 supramolecular assembly.
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Affiliation(s)
- Aditi Roy
- Department of Chemistry
- University of North Bengal
- Darjeeling – 734013
- India
| | - Subhadeep Saha
- Department of Chemistry
- University of North Bengal
- Darjeeling – 734013
- India
| | - Biswajit Datta
- Department of Chemistry
- University of North Bengal
- Darjeeling – 734013
- India
| | - Mahendra Nath Roy
- Department of Chemistry
- University of North Bengal
- Darjeeling – 734013
- India
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