Assessment of dairy product quality by selective incubation and rapid techniques

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dc.contributor.authorByrne, Robert Duaneen
dc.contributor.committeechairBishop, J. Russellen
dc.contributor.committeememberEigel, William N. IIIen
dc.contributor.committeememberJones, Gerald M.en
dc.contributor.departmentFood Science and Technologyen
dc.date.accessioned2014-03-14T21:50:25Zen
dc.date.adate2012-11-21en
dc.date.available2014-03-14T21:50:25Zen
dc.date.issued1989-12-05en
dc.date.rdate2012-11-21en
dc.date.sdate2012-11-21en
dc.description.abstractA study was conducted to investigate the use of bacterial numbers and metabolites for their Value in predicting potential shelf-life of pasteurized fluid milk. The study consisted of two phases. In the first phase, chemical inhibitors were evaluated for their ability to allow growth of gram-negative psychrotrophic bacteria while inhibiting growth of gram-positive organisms. Crystal violet, benzalkonium chloride, a mixture of crystal violet and benzalkonium chloride, and alkylaryl sulfonate were tested. These were incubated with milk samples separately inoculated with gram-negative and gram-positive bacteria, at 2l°C for 18 hours. Alkylaryl sulfonate allowed growth of gram-positive organisms. Crystal violet inhibited gram-positive organisms but was not as effective as the mixture of crystal violet and benzalkonium chloride, The inhibitor of choice was benzalkonium chloride as it inhibited growth of all gram-positive organisms tested and allowed growth of the gram-negative psychrotrophic organisms.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 51 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11212012-040107en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11212012-040107/en
dc.identifier.urihttp://hdl.handle.net/10919/45943en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1989.B976.pdfen
dc.relation.isformatofOCLC# 21188564en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1989.B976en
dc.subject.lcshDairy products -- Qualityen
dc.subject.lcshMilk -- Qualityen
dc.titleAssessment of dairy product quality by selective incubation and rapid techniquesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineFood Science and Technologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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