【英文标准名称】:Foodstuffs-DeterminationofniacinbyHPLC
【原文标准名称】:食品.烟酸的高效液相色谱法(HPLC)测定
【标准号】:BSEN15652-2009
【标准状态】:现行
【国别】:英国
【发布日期】:2009-06-30
【实施或试行日期】:2009-06-30
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:化学分析和测试;比较;比较分析法;测定;含量测定;萃取;食品检验;食品;高效液相色谱法;高效液相色谱分析法;水解;质量浓度;数学计算;分析方法;烟酰胺;精密度;复合维生素B;维生素
【英文主题词】:Chemicalanalysisandtesting;Comparison;Comparisonanalysis;Determination;Determinationofcontent;Extraction;Foodinspection;Foodproducts;Highperformanceliquidchromatography;HPLC;Hydrolysis;Massconcentration;Mathematicalcalculations;Methodsofanalysis;Nicotinamide;Precision;VitaminBcomplex;Vitamins
【摘要】:ThisEuropeanStandardspecifiesamethodforthedeterminationofthemassfractionofniacininfoodstuffsbyhighperformanceliquidchromatography(HPLC)bythreedifferentwaysofhydrolysis,acidhydrolysis(A),enzymatichydrolysis(B)oracid/alkalinehydrolysis(C).Themethodhasbeenvalidatedininterlaboratorytestsonfortifiedandnon-fortifiedsamplessuchasbreakfastcerealpowder,chocolatecereals,cookedham,greenpeas,lyophilizedgreenpeaswithham,lyophilizedsoup,nutritiveorangejuice,milkpowderandwheatflour,atlevelsfrom0,5mg/100gto24mg/100g.Forfurtherinformationonthevalidationdata,seeAnnexB.AandBgivesimilarresultsforniacin.InoptionsAandBniaciniscalculatedasthesumofnicotinamideandnicotinicacid,andexpressedasnicotinicacid[1].OptionCgiveshigherresultsthanAandBforniacinwithnon-supplementedcereals,butsimilarresultsforotherproducts.InoptionC,niaciniscalculatedandexpressedasnicotinicacidaftertransformationofnicotinamideintonicotinicacid[2].OptionAisfasterandcheaperthanBandC.OptionBisusedifanexactquantificationofnicotinamideandnicotinicacidisneeded.ThiscannotbedonewithoptionA,becausethereisaslighttransformationofnicotinamideintonicotinicacidduringtheacidhydrolysis.OptionCquantifiestotalniacin.Thealkalinehydrolysisisabletoliberateotherformsgivinghigherresultsforniacin,whichinsomefoodssuchasmaizeandcerealsarenotnormallybiologicallyavailable,see[3],[4]and[5].InformationonacomparisonbetweenthethreedifferentwaysofhydrolysisisgiveninAnnexC.
【中国标准分类号】:X04
【国际标准分类号】:67_050
【页数】:24P.;A4
【正文语种】:英语


【英文标准名称】:OpenSystemsInterconnection:filetransfer,accessandmanagement.Fileprotocolspecification
【原文标准名称】:开式系统互连.文档转换、存取和管理.第4部分:文档协议规范
【标准号】:BS7090-4-1989
【标准状态】:作废
【国别】:英国
【发布日期】:1989-07-31
【实施或试行日期】:1989-07-31
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:开式系统互连;误差检测;句法;文件结构(计算机);合格;应用层;计算机技术;文档;算法;数据传送;数据传输;编码(数据转换)
【英文主题词】:fileorganization(computers);algorithms;conformity;opensystemsinterconnection;datatransfer;syntax;datatransmission;coding(dataconversion);applicationlayer(osi);computertechnology;files;errordetection
【摘要】:Thebasicprotocolthatsupportstheusercorrectablefileservice;theerrorrecoveryprotocolwhichsupportsthereliablefileservice;theabstractsyntaxrequiredtoconveythefileprotocolinformationandconformancerequirements.
【中国标准分类号】:L79
【国际标准分类号】:35_100_60
【页数】:380P;A4
【正文语种】:英语