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1、畢業(yè)論文(設計)中文摘要醬油中乙酰丙酸測定方法研究摘要由于生產工藝的不同,醬油可分為釀造醬油、水解醬油和配制醬油三種。這三種醬油的生產成本及營養(yǎng)價值差異很大,其中釀造醬油營養(yǎng)價值及生產成本最高,為有效防止其他種類的醬油冒充釀造醬油,保護消費者的利益,急需建立有效的可操作性的分析方法。釀造醬油中乙酰丙酸含量極微,而其他醬油中乙酰丙酸含量相對較高,所以醬油中乙酰丙酸的含量是區(qū)分釀造醬油和其他醬油的重要指標之一。本文采用高效液相色譜法研究了醬油中乙酰丙酸含量的測定方法,結果表明:當色譜條件為Lichrspher-C1
2、8(150mm×4.6mm,i.d.5μm),流動相甲醇:水=15:85,流速1.0mL/min,檢測波長266nm,進樣體積5μL,采用了標準加入法定量,乙酰丙酸加入量與其峰面積在5.00~25.00mg·mL-1范圍內有良好的線性關系,方法的重現(xiàn)性(RSD)為2.3%。經用于實際樣品分析,在釀造醬油中,其相關系數(shù)r為0.9995,平均加標回收率為99.1%;在配制醬油中,其相關系數(shù)r為0.9996,平均加標回收率為98.5%。此法操作簡單、快速,符合要求。關鍵詞:乙酰丙酸,高效液相色譜法,醬油28畢業(yè)論文(
3、設計)英文摘要StudyontheanalysismethodofLevulinicAcidinsoysauceAbstractSoysauceisconsistoftheblendedsoysauces,thehydrolyticsoysauceandfermentedsoysaucebecauseofdifferenttechniqueofproduction.Thesethreesoysaucesdiffergreatlyinproductioncostandnutritivevalue,andthefe
4、rmentedsoysaucehasthehighestproductioncostandnutritivevalue.Inordertoavoidothersoysaucespersonatingthefermentedsoysauce,thereisanurgentneedtoestablisheffectiveandpracticablemethodtoprotectthebenefitofconsumers.Thecontentoflevulinicacidisrelativelylowerinthef
5、ermentedsoysauceandhigherinothersoysauces.Sothecontentoflevulinicacidinthesoysaucesisanimportantindextodistinguishthefermentedsoysaucesandothersoysauces.ThedeterminationoflevulinicacidinsoysaucehasbeenstudiedbymeansofHighPerformanceLiquidChromatography(HPLC)
6、.Theresultsindicatethatanalyticalconditionsincludecolumn:C18(150×4.6mm,5μm),mobilephase:methanol-water(15:85v/v),UVdetectionwavelength:266nm,flowrate:1.0mL/min,oventemperature:25℃,injectionvolume:5μL.Thestandardadditioncalibrationtechniqueisappliedinthepaper
7、.Therearegoodlinearcorrelationsbetweentheconcentrationsandpeakareasofthecomponents,thelinearrangeisfrom5.00mg·mL-1to25.00mg·mL-1.Thereproducibilityofthecontentoflevulinicacidis2.3%.Thismethodhasbeenappliedtotheanalysisofrealsamples.Theresultsshowthatthelinea
8、rcorrelationcoefficientis0.9995inthefermentedsoysauceand0.9996intheblendedsoysauce,andtheaveragerecoveryis99.1%inthefermentedsoysauceand98.5%intheblendedsoysauce.Theexperimentalresultsshowthatth