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      Antimicrobial Activity of Zinc Oxide Nano/Microparticles and Their Combinations against Pathogenic Microorganisms for Biomedical Applications: From Physicochemical Characteristics to Pharmacological Aspects

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          Abstract

          Zinc oxide (ZnO) nano/microparticles (NPs/MPs) have been studied as antibiotics to enhance antimicrobial activity against pathogenic bacteria and viruses with or without antibiotic resistance. They have unique physicochemical characteristics that can affect biological and toxicological responses in microorganisms. Metal ion release, particle adsorption, and reactive oxygen species generation are the main mechanisms underlying their antimicrobial action. In this review, we describe the physicochemical characteristics of ZnO NPs/MPs related to biological and toxicological effects and discuss the recent findings of the antimicrobial activity of ZnO NPs/MPs and their combinations with other materials against pathogenic microorganisms. Current biomedical applications of ZnO NPs/MPs and combinations with other materials are also presented. This review will provide the better understanding of ZnO NPs/MPs as antibiotic alternatives and aid in further development of antibiotic agents for industrial and clinical applications.

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          Review on Zinc Oxide Nanoparticles: Antibacterial Activity and Toxicity Mechanism

          Amna Sirelkhatim, Shahrom Mahmud, Azman Seeni … (2015)
          Antibacterial activity of zinc oxide nanoparticles (ZnO-NPs) has received significant interest worldwide particularly by the implementation of nanotechnology to synthesize particles in the nanometer region. Many microorganisms exist in the range from hundreds of nanometers to tens of micrometers. ZnO-NPs exhibit attractive antibacterial properties due to increased specific surface area as the reduced particle size leading to enhanced particle surface reactivity. ZnO is a bio-safe material that possesses photo-oxidizing and photocatalysis impacts on chemical and biological species. This review covered ZnO-NPs antibacterial activity including testing methods, impact of UV illumination, ZnO particle properties (size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration. Particular emphasize was given to bactericidal and bacteriostatic mechanisms with focus on generation of reactive oxygen species (ROS) including hydrogen peroxide (H2O2), OH− (hydroxyl radicals), and O2 −2 (peroxide). ROS has been a major factor for several mechanisms including cell wall damage due to ZnO-localized interaction, enhanced membrane permeability, internalization of NPs due to loss of proton motive force and uptake of toxic dissolved zinc ions. These have led to mitochondria weakness, intracellular outflow, and release in gene expression of oxidative stress which caused eventual cell growth inhibition and cell death. In some cases, enhanced antibacterial activity can be attributed to surface defects on ZnO abrasive surface texture. One functional application of the ZnO antibacterial bioactivity was discussed in food packaging industry where ZnO-NPs are used as an antibacterial agent toward foodborne diseases. Proper incorporation of ZnO-NPs into packaging materials can cause interaction with foodborne pathogens, thereby releasing NPs onto food surface where they come in contact with bad bacteria and cause the bacterial death and/or inhibition.
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            Curcumin: A Review of Its’ Effects on Human Health

            Susan J Hewlings, Douglas Kalman (2017)
            Turmeric, a spice that has long been recognized for its medicinal properties, has received interest from both the medical/scientific world and from culinary enthusiasts, as it is the major source of the polyphenol curcumin. It aids in the management of oxidative and inflammatory conditions, metabolic syndrome, arthritis, anxiety, and hyperlipidemia. It may also help in the management of exercise-induced inflammation and muscle soreness, thus enhancing recovery and performance in active people. In addition, a relatively low dose of the complex can provide health benefits for people that do not have diagnosed health conditions. Most of these benefits can be attributed to its antioxidant and anti-inflammatory effects. Ingesting curcumin by itself does not lead to the associated health benefits due to its poor bioavailability, which appears to be primarily due to poor absorption, rapid metabolism, and rapid elimination. There are several components that can increase bioavailability. For example, piperine is the major active component of black pepper and, when combined in a complex with curcumin, has been shown to increase bioavailability by 2000%. Curcumin combined with enhancing agents provides multiple health benefits. The purpose of this review is to provide a brief overview of the plethora of research regarding the health benefits of curcumin.
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              Antimicrobial activity of metals: mechanisms, molecular targets and applications.

              Joseph A. Lemire, Joe Harrison, Raymond J. Turner (2013)
              Metals have been used as antimicrobial agents since antiquity, but throughout most of history their modes of action have remained unclear. Recent studies indicate that different metals cause discrete and distinct types of injuries to microbial cells as a result of oxidative stress, protein dysfunction or membrane damage. Here, we describe the chemical and toxicological principles that underlie the antimicrobial activity of metals and discuss the preferences of metal atoms for specific microbial targets. Interdisciplinary research is advancing not only our understanding of metal toxicity but also the design of metal-based compounds for use as antimicrobial agents and alternatives to antibiotics.
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                Author and article information

                Contributors
                Nghia P. Truong: Role: Academic Editor
                Journal
                Journal ID (nlm-ta): Nanomaterials (Basel)
                Journal ID (iso-abbrev): Nanomaterials (Basel)
                Journal ID (publisher-id): nanomaterials
                Title: Nanomaterials
                Publisher: MDPI
                ISSN (Electronic): 2079-4991
                Publication date (Electronic): 20 January 2021
                Publication date Collection: February 2021
                Volume: 11
                Issue: 2
                Electronic Location Identifier: 263
                Affiliations
                [1 ]Research Institute for Medical Sciences, College of Medicine, Inha University, Incheon 22212, Korea
                [2 ]College of Pharmacy, Ajou University, Suwon 16499, Korea
                Author notes
                [* ]Correspondence: jins@ 123456inha.ac.kr (S.-E.J.); hjin@ 123456ajou.ac.kr (H.-E.J.)
                Author information
                https://orcid.org/0000-0003-3342-4371
                https://orcid.org/0000-0002-1292-5508
                Article
                Publisher ID: nanomaterials-11-00263
                DOI: 10.3390/nano11020263
                PMC ID: 7922830
                PubMed ID: 33498491
                SO-VID: 0256eafc-23b0-4a86-8839-14b4c5e5e368
                Copyright © © 2021 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 13 December 2020
                Date accepted : 17 January 2021
                Categories
                Subject: Review

                Keywords: zinc oxide nano/microparticles,antimicrobial activity,nanoantibiotics,physicochemical characteristics,biomedical application
                Data availability:
                Keywords: zinc oxide nano/microparticles, antimicrobial activity, nanoantibiotics, physicochemical characteristics, biomedical application

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