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Novel Nanocomposites for the Treatme...

Baek, Soyoung.

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Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms./
Author:	Baek, Soyoung.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	198 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
Subject:	Water Resource Management. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13877747
ISBN:	9781392230268

Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms.
Baek, Soyoung.

Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 198 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--University of Miami, 2019.

This item must not be sold to any third party vendors.

Recently, the presence of antibiotic-resistant bacteria in water is a major concern worldwide due to its adverse health effects. Conventional disinfection technologies, such as ultraviolet, ozone, and chlorine disinfection are currently used to inactivate antibioticresistant bacteria in water. Conventional disinfection technologies not only produce byproducts but also selectively promote the survival of antibiotic-resistant bacteria. Nanoparticles (NPs), even in a small amounts, have potential benefits as novel materials in terms of inactivating pathogenic bacteria due to their strong antibacterial effect. However, because of issues pertaining to leaching, mobility, and the cost of NPs, their applications for water treatment have not been pursued earlier. Therefore, this study seeks to understand the development of NPs for water treatment applications by using alginate coating to encapsulate NPs.To study the development of NP-alginate beads, the antibacterial properties and toxicity mechanisms of different types of NPs (i.e., Industrial NPs, NPs derived from consumer products, and nanohybrids) were investigated on antibiotic-resistant bacteria (i.e., E. coli and P. aeruginosa). The study showed that the large surface area and dispersion of NPs enhanced the effect of antibacterial properties. ROS (reactive oxygen species) produced by NPs was the primary mechanism for inactivating the antibiotic-resistant bacteria.Based on the results of the effects of antibacterial properties and the mechanisms of NPs, novel nanocomposites for the removal of antibiotic-resistant bacteria in water were synthesized by encapsulating NPs in alginate-beads. NP-alginate beads were designed to prevent NP's leaching into the water, and to promote the antibacterial properties of NPs through dispersion and increased surface areas. The results showed that the NP-alginate beads inactivated up to 99.1% of antibiotic-resistant bacteria and the bacterial inactivation increased with the increasing dose of NPs.In the current study, these NPs-alginate beads revealed efficacy with no by-product formed and proved cost-effective with just a small amount of NPs and are reusable in the treatment of antibiotic-resistant bacteria in water. Therefore, the alginate nanocomposites can be deemed as potential antimicrobial agents for water disinfection, and offer a new opportunity for a large-scale production for point-of-use treatment.

ISBN: 9781392230268Subjects--Topical Terms:

1669219
Water Resource Management.

Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms.
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245 1 0 $a Novel Nanocomposites for the Treatment of Antibiotic-Resistant Bacteria in Water - Antibacterial Effects and Mechanisms.
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300 $a 198 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
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506 $a This item must not be sold to any third party vendors.
520 $a Recently, the presence of antibiotic-resistant bacteria in water is a major concern worldwide due to its adverse health effects. Conventional disinfection technologies, such as ultraviolet, ozone, and chlorine disinfection are currently used to inactivate antibioticresistant bacteria in water. Conventional disinfection technologies not only produce byproducts but also selectively promote the survival of antibiotic-resistant bacteria. Nanoparticles (NPs), even in a small amounts, have potential benefits as novel materials in terms of inactivating pathogenic bacteria due to their strong antibacterial effect. However, because of issues pertaining to leaching, mobility, and the cost of NPs, their applications for water treatment have not been pursued earlier. Therefore, this study seeks to understand the development of NPs for water treatment applications by using alginate coating to encapsulate NPs.To study the development of NP-alginate beads, the antibacterial properties and toxicity mechanisms of different types of NPs (i.e., Industrial NPs, NPs derived from consumer products, and nanohybrids) were investigated on antibiotic-resistant bacteria (i.e., E. coli and P. aeruginosa). The study showed that the large surface area and dispersion of NPs enhanced the effect of antibacterial properties. ROS (reactive oxygen species) produced by NPs was the primary mechanism for inactivating the antibiotic-resistant bacteria.Based on the results of the effects of antibacterial properties and the mechanisms of NPs, novel nanocomposites for the removal of antibiotic-resistant bacteria in water were synthesized by encapsulating NPs in alginate-beads. NP-alginate beads were designed to prevent NP's leaching into the water, and to promote the antibacterial properties of NPs through dispersion and increased surface areas. The results showed that the NP-alginate beads inactivated up to 99.1% of antibiotic-resistant bacteria and the bacterial inactivation increased with the increasing dose of NPs.In the current study, these NPs-alginate beads revealed efficacy with no by-product formed and proved cost-effective with just a small amount of NPs and are reusable in the treatment of antibiotic-resistant bacteria in water. Therefore, the alginate nanocomposites can be deemed as potential antimicrobial agents for water disinfection, and offer a new opportunity for a large-scale production for point-of-use treatment.
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