Protoporphyrin IX conjugated bacterial cellulose via diamide spacer arms with specific antibacterial photodynamic inactivation against Escherichia coli

Protoporphyrin IX conjugated bacterial cellulose via diamide spacer arms with specific... Herein, protoporphyrin IX (PPIX) was covalently grafted onto a bacterial cellulose (BC) surface via three diamine spacer arms with different chain lengths. The obtained materials were characterized by spectroscopic (infrared, Raman, UV–Vis diffuse reflectance, electron paramagnetic and fluorescence) and physical (elemental, gravimetric) methods. Antibacterial efficacy was evaluated against Staphylococcus aureus and Escherichia coli, and the PPIX supported BC surface exhibited specific antibacterial photodynamic inactivation against E. coli. The 1,2-bis(2-aminoethoxy)ethane aminated BC immobilized the maximal amount of PPIX, and the resulting photosensitive surface achieved a 99.999% (1st cycle) inactivation efficiency against E. coli, but relatively low efficiency against S. aureus. A mechanism of Gram negative bacterial inactivation was proposed as the positively charged PPIX-conjugated BC surface coupled with sufficient 1O2 generation. Though the reusability of the as-fabricated materials needs to be further enhanced, this work provides a potent strategy for efficient photodynamic inactivation against Gram negative bacteria using neutral photosensitizers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cellulose Springer Journals

Protoporphyrin IX conjugated bacterial cellulose via diamide spacer arms with specific antibacterial photodynamic inactivation against Escherichia coli

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Publisher
Springer Netherlands
Copyright
Copyright © 2018 by Springer Science+Business Media B.V., part of Springer Nature
Subject
Chemistry; Bioorganic Chemistry; Physical Chemistry; Organic Chemistry; Polymer Sciences; Ceramics, Glass, Composites, Natural Materials; Sustainable Development
ISSN
0969-0239
eISSN
1572-882X
D.O.I.
10.1007/s10570-018-1697-3
Publisher site
See Article on Publisher Site

Abstract

Herein, protoporphyrin IX (PPIX) was covalently grafted onto a bacterial cellulose (BC) surface via three diamine spacer arms with different chain lengths. The obtained materials were characterized by spectroscopic (infrared, Raman, UV–Vis diffuse reflectance, electron paramagnetic and fluorescence) and physical (elemental, gravimetric) methods. Antibacterial efficacy was evaluated against Staphylococcus aureus and Escherichia coli, and the PPIX supported BC surface exhibited specific antibacterial photodynamic inactivation against E. coli. The 1,2-bis(2-aminoethoxy)ethane aminated BC immobilized the maximal amount of PPIX, and the resulting photosensitive surface achieved a 99.999% (1st cycle) inactivation efficiency against E. coli, but relatively low efficiency against S. aureus. A mechanism of Gram negative bacterial inactivation was proposed as the positively charged PPIX-conjugated BC surface coupled with sufficient 1O2 generation. Though the reusability of the as-fabricated materials needs to be further enhanced, this work provides a potent strategy for efficient photodynamic inactivation against Gram negative bacteria using neutral photosensitizers.

Journal

CelluloseSpringer Journals

Published: Feb 6, 2018

References

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