Polymer-layered silicate nanocomposites in the design of antimicrobial materials

Abstract

A robust processing of polymers into antimicrobial materials is introduced using polymer/clay nanotechnology. Antimicrobial activity of commercially available organoclays modified with cationic surfactants has been screened in tests against gram-negative Escherichia coli and gram-positive Staphylococcus aureus bacteria. Despite the leaching biocidal surfactants, cell interactions with organoclay surface have been identified to be responsible for antimicrobial activity of organoclays. Distribution of clay platelets within polymer matrix by melt extrusion process resulted in polymer/clay nanocomposites active against both gram-positive and gram-negative bacteria by contact. The study discloses a much overlooked function of organoclays modified with cationic surfactants for nanocomposite application, i.e., the ability of organoclays to render polymer nanocomposites biocidal.

Antibacterial and antifungal LDPE films for active packaging

“…[2,[44][45][46] An emerging approach is to employ polymer nanocomposites for potential antimicrobial applications. [47][48][49] The prevailing methodology in most studies is to incorporate organo-modified montmorillonite clays (MMT) as filler during melt compounding. [26,31,50] The rational for the incorporation of the clay was to improve the barrier properties of the films in order to protect the volatile and heat-sensitive essential oil molecules.…”

Preparation of LDPE/EVA/PE-MA, Nano Clay Blend Composite in the Stage Potassium Sorbate (KS) and Garlic Oil (GO) as an Antimicrobial Substance

“…namely, microorganisms often have strong powers to live on normal polymeric materials. preparation of antibacterial nanocomposite is one of the possible states to reduce a danger of unclean, diseased things of surface of polymer materials [14][15][16]. Light polyethylene is one of common thermoplastic plastics that with respect to the price, producing careful way and because of having some features such as light weight, high thermal without change, unmoving, slow destruction (by acid) resistance, good strength against stretch and water gettinginto, having the lowest making soft point than other plastics and this less energy and processing costs in comparison with other making a parcel plastics, get attraction special attention toward itself and are widely used in the food making a parcel industries [17,18].…”

Estudo da influência de argilas organofílicas no processo de biodegradação do PLA

“…A efetividade da ação antimicrobiana de compostos quaternários de amônio pode variar com sua estrutura química, sendo que os mais hidrofóbicos provavelmente não apresentam impacto sobre as comunidades microbianas, em razão da baixa biodisponibilidade, ou seja, baixa ocorrência em fase aquosa [44] . Nigmatulin et al [45] reportou que modificadores orgânicos mais hidrofílicos como o da argila Cloisite 30B podem migrar mais facilmente para o meio aquoso quando comparados àqueles mais hidrofóbicos, como o presente na Cloisite 20A. O modificador orgânico da Cloisite 30B, por ser mais hidrofílico (devido à presença de duas hidroxilas na sua estrutura química) tende a apresentar maior biodisponibilidade, e consequentemente, maior potencial para provocar o efeito antimicrobiano.…”