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T. de Carvalho L, da S. Paula ML, M. de Moraes R, Alves GM, M. Lacerda T, dos Santos JC, M. dos Santos A, Medeiros SDF. Chemical Modification of Pullulan Exopolysaccharide by Grafting Poly(3-hydroxybutyrate- co-3-hydroxyvalerate) (PHBHV) via Click Chemistry. Polymers (Basel) 2020; 12:polym12112527. [PMID: 33138011 PMCID: PMC7693682 DOI: 10.3390/polym12112527] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/30/2020] [Accepted: 08/06/2020] [Indexed: 01/25/2023] Open
Abstract
Biodegradable and biocompatible copolymers have been often studied for the development of biomaterials for drug delivery systems. In this context, this work reports the synthesis and characterization of a novel pullulan-g-poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (Pull-g-PHBHV) graft copolymer using click chemistry. Well-defined and functional pullulan backbones containing azide groups (PullN3) previously prepared by our group were successfully used for this purpose and propargyl-terminated poly(3-hydroxybutyrate-co-3-hydroxyvalerate) was prepared via transesterification using propargyl alcohol as a chain transfer agent. By an alkyne-azide cycloaddition reaction catalyzed by copper (Cu (I)) (CuAAC), the graft copolymer Pull-g-PHBHV was obtained. The chemical structures of the polymers were accessed by 1H NMR and 13C NMR FTIR. Disappearance of the bands referring to the main bonds evidenced success in the grafting reaction. Besides that, DRX, DSC and TGA were used in order to access the changes in crystallinity and thermal behavior of the material. The remaining crystallinity of the Pull-g-PHBHV structure evidences the presence of PHBHV. Pull-g-PHBHV presented lower degradation maximum temperature values than the starting materials, indicating its minor thermal stability. Finally, the synthesized material is an innovative biopolymer, which has never been reported in the previous literature. It is a bio-derived and biodegradable polymer, chemically modified, resulting in interesting properties which can be useful for their further applications as biomedical systems for controlled delivery, for example.
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Affiliation(s)
- Layde T. de Carvalho
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
| | - Maria Luiza da S. Paula
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
| | - Rodolfo M. de Moraes
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
| | - Gizelda M. Alves
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
| | - Talita M. Lacerda
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, Lorena 12602-810, SP, Brazil; (T.M.L.); (J.C.d.S.)
| | - Julio C. dos Santos
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, Lorena 12602-810, SP, Brazil; (T.M.L.); (J.C.d.S.)
| | - Amilton M. dos Santos
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
| | - Simone de F. Medeiros
- Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, EEL-USP, Lorena 12602-810, SP, Brazil; (L.T.d.C.); (M.L.d.S.P.); (R.M.d.M.); (G.M.A.); (A.M.d.S.)
- Correspondence:
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