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Chitosan-Based Systems for Controlled Delivery of Antimicrobial Peptides for Biomedical Application

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Abstract

Nowadays, topical microbial infections and antimicrobial resistance are global public health challenges. Despite the fact that many different antibiotics have been discovered during the “golden era,” they cannot withstand due to increase in antimicrobial resistance. Antimicrobial polymers have gained attention due to their unique properties. Chitosan, a biocompatible and biodegradable polymer, has been used as an antimicrobial agent in different biomedical applications. As well, antimicrobial peptides (AMPs) are potent candidates to kill the microorganisms; however, their high toxicity and hemolytic activity hinder their clinical use. In this chapter, the use of chitosan as a matrix or as a carrier for antimicrobial peptides is addressed, with an emphasis on topical application. The first section provides an overview of the present challenges related to topical microbial infections and the antimicrobial resistance. Second, chitosan and its antimicrobial mechanism against both Gram-positive and Gram-negative bacteria, as well as fungi, are summed up. In the third section, antimicrobial peptides as efficient antimicrobial agents and their in vitro, in vivo, and current clinical applications are presented. In particular, binding AMPs to chitosan either by covalent conjugation or using chitosan as a carrier is investigated in the last section.

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Abbreviations

ADMET:

Absorption, distribution, metabolism, excretion, and toxicity

AMP:

Antimicrobial peptide

AMR:

Antimicrobial resistance

CFU:

Colony-forming unit

CMTMC:

Carboxymethyl-trimethyl chitosan

DA:

Degree of acetylation

DMCMC:

N-(4-N,N-Dimethylaminocinnamyl) chitosan

DQ:

Degree of quaternization

DS:

Degree of substitution

EDC:

1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide

ESKAPE:

Enterococcus spp., S. aureus, Klebsiella spp., A. baumannii, P. aeruginosa, and Enterobacter spp.

FDA:

Food and Drug Administration

GRAS:

Generally recognized as safe

HC:

Hemolytic activity

HC50 :

Hemolytic activity to cause 50% lysis of RBCs

hLF:

Human lactoferin fragment

HMW:

High molecular weight

LMW:

Low molecular weight

MTGase:

Microbial transglutaminase

MPyMeC:

Methylated N-(4-pyridylmethyl) chitosan chloride

MW:

Molecular weight

MBC:

Minimal bactericidal concentration

MIC:

Minimal inhibitory concentration

NHS:

N-Hydroxysulfosuccinimide

NP:

Nanoparticle

O-QCTS-DEBn:

O-Quaternized-N,N-diethyl-N-benzyl ammonium chitosan

O-QCTSS:

O-quaternized-N-benzylidene-chitosan

γ-PGA:

Poly-γ-glutamic acid

PLGA:

Poly-(lactic-co-glycolic acid)

Ppm:

Parts per million

RBC:

Red blood cells

TBDMS:

Tert-butyldimethylsilyl

TMC:

Trimethyl chitosan

TPP:

Sodium tripolyphosphate

USP:

United States Pharmacopeia

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Acknowledgments

We would like to acknowledge Aleksandar Jovanovic for his help in drawing Fig. 14.1.

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Correspondence to Gerrit Borchard .

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© 2019 Springer Nature Singapore Pte Ltd.

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Patrulea, V., Younes, I., Jordan, O., Borchard, G. (2019). Chitosan-Based Systems for Controlled Delivery of Antimicrobial Peptides for Biomedical Application. In: Jana, S., Jana, S. (eds) Functional Chitosan. Springer, Singapore. https://doi.org/10.1007/978-981-15-0263-7_14

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