BS ISO 14461-2-2005 乳和乳制品.微生物实验室内质量控制.平行板和后续稀释步骤的菌落计数可靠性测定

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【英文标准名称】:Milkandmilkproducts-Qualitycontrolinmicrobiologicallaboratories-Determinationofthereliabilityofcolonycountsofparallelplatesandsubsequentdilutionsteps
【原文标准名称】:乳和乳制品.微生物实验室内质量控制.平行板和后续稀释步骤的菌落计数可靠性测定
【标准号】:BSISO14461-2-2005
【标准状态】:现行
【国别】:英国
【发布日期】:2005-08-04
【实施或试行日期】:2005-08-04
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:食品;食品检验;食品检验;菌落计数;试验;定义;可靠度;质量控制;微生物学;牛奶;乳制品;实验室;乳制品分析;农产品;微生物分析;奶制品;菌落计数技术
【英文主题词】:Agriculturalproducts;Colonycount;Colonycounttechniques;Dairyanalysis;Dairyproducts;Definition;Definitions;Foodinspection;Foodproducts;Foodtesting;Laboratories;Microbiologicalanalysis;Microbiology;Milk;Milkproducts;Qualitycontrol;Reliability;Testing
【摘要】:ThispartofISO14461|IDF169describesaroutineprocedurefortheevaluationofresultsoftheenumerationofmicroorganismsusingcolony-countmethodswithsubsequent10-folddilutionstepsandoneplateortwoparallelplateswithineachdilutionstep.Thisroutineprocedureisappliedregularlyineachlaboratoryperformingcolonycounts.Itprovidescriteriafortheacceptabilityofdifferencesbetweentheresultsfromparallelplatesandsubsequentdilutionsteps,asfollows.a)Theresults(colonycounts)obtainedfromparallelplatesarecomparedwithtabulatedlimitsforgivencolonycounts.Iftheselimitsareexceeded,atechnicalproblemwhenperformingtheparalleldeterminationsmaybeindicated.b)Theresults(sumsofcolonycounts)oftwoparallelplatesoftwosubsequent10-folddilutionstepsarecomparedwithtabulatedlimitsforgivensumsofcolonycounts.Iftheselimitsareexceeded,atechnicalproblemwhenperformingthedilutionsmaybeindicated.c)Ifthelimitsmentionedaboveareexceededinmorecasesthanexpected,thisindicatesthatthetestprocedurelacksreliability.NOTETheformulaeforcalculatingthevaluesinTable1and2aregivenandexplainedinClause7.
【中国标准分类号】:X16
【国际标准分类号】:07_100_30
【页数】:28P.;A4
【正文语种】:英语