Effects of small-diameter silver nanoparticles on microbial load in cow milk

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dc.contributor.authorYildiz, N.
dc.contributor.authorPala, A.
dc.date.accessioned2025-01-27T21:03:50Z
dc.date.available2025-01-27T21:03:50Z
dc.date.issued2012
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractControlling bacterial growth in fluid milk is of economic interest, and supplemental methods to stop or reduce bacterial growth before and during the cooling chain may be valuable. Silver is effective in controlling growth of single-celled organisms, but has no effect on tissue cells. Smaller diameter (6-8 nm) silver nanoparticles were produced, with purity over 99.99% (no chemical reaction used in the process), by using a terminated gas condensation principle. The first trial investigated effects of time, temperature, and accelerating voltages on total aerobic bacteria count in control milk and milk treated with silver nanoparticles. Metal braids were coated with silver nanoparticles using 3 accelerating voltages, 0, 100, and 200 V, the results of which indicated that the braids coated using 100 V (AgNP100) were optimal. The AgNP1.00 particles were effective at all treatment temperatures and durations except for 10 h, which indicated that the treated milk could be used after 10 h for other dairy products such as yogurt, which require microbial activity. The second experiment investigated the effects of silver nanoparticles on counts of yeasts and molds, coliform bacteria, Escherichia coli, and Staphylococcus aureus in cow milk by treating milk with AgNP100 braids at 22 degrees C for 1 h. Inductively coupled plasma mass spectrometry analyses indicated that the maximum amount of silver found in the AgNP100-treated milk was 6.1 mu g/L, which is below the safety limits. Counts in milk samples containing the nanoparticle-coated braids were lower for all yeasts and molds and bacteria investigated compared with the control milk samples, which were kept under the same conditions but without; the braids. The differences were significant for coliforms, Escherichia coli, and Staphylococcus aureus but not for yeasts and molds, although ranking of the counts (AgNP100 < initial load < control) were the same for all microorganisms. Small-diameter, silver nanoparticle-coated braids can stop or reduce bacterial growth in fluid milk. Silver nanoparticles inhibited microbial growth and may be useful in complementing the cooling chain and the thermal processes. These results warrant more research on the sensory properties and long-term safety of the use of silver nanoparticles in dairy products.
dc.description.sponsorshipScientific Research Commission of Canakkale 18 Mart University (Canakkale, Turkey)
dc.description.sponsorshipThis project was partially supported by Scientific Research Commission of Canakkale 18 Mart University (Canakkale, Turkey). We also thank Alistair Kean (Mantis Deposition, Thame, UK) for his help.
dc.identifier.doi10.3168/jds.2011-4817
dc.identifier.endpage1127
dc.identifier.issn0022-0302
dc.identifier.issn1525-3198
dc.identifier.issue3
dc.identifier.pmid22365195
dc.identifier.scopus2-s2.0-84857312171
dc.identifier.scopusqualityQ1
dc.identifier.startpage1119
dc.identifier.urihttps://doi.org/10.3168/jds.2011-4817
dc.identifier.urihttps://hdl.handle.net/20.500.12428/27467
dc.identifier.volume95
dc.identifier.wosWOS:000300531500009
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherElsevier Science Inc
dc.relation.ispartofJournal of Dairy Science
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectnanotechnology
dc.subjectsilver nanoparticle
dc.subjectcow milk
dc.subjectinductively coupled plasma mass spectrometry
dc.titleEffects of small-diameter silver nanoparticles on microbial load in cow milk
dc.typeArticle

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