SN/T 0859-2016
基本信息
标准号:
SN/T 0859-2016
中文名称:出口调味料中脱氢乙酸的测定紫外分光光度法
标准类别:商检行业标准(SN)
标准状态:现行
出版语种:简体中文
下载格式:.zip .pdf
下载大小:3979000
相关标签:
出口
调味料
脱氢
乙酸
测定
紫外
光度法
标准分类号
关联标准
出版信息
相关单位信息
标准简介
SN/T 0859-2016.Determination of dehydroacetic acid in condiments for export-Ultraviolet spectrophotometric method.
1范围
SN/T 0859规定了用紫外分光光度法测定出口调味料中脱氢乙酸含量的方法。
SN/T 0859适用于出口酱油(生抽酱油、老抽酱油)、醋、蚝油、烧烤汁、调味酱中脱氢乙酸含量的测定。
2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T6682分析实验室用水规格和试验方法
3测定方法
3.1方法原理
样品中脱氢乙酸在酸性条件下经水蒸气蒸馏和有机溶剂萃取后,用紫外分光光度计在308nm波长处测定吸光度,与标准比较定量。
3.2试剂和材料
除非另有规定,本方法所用试剂均为分析纯。水为GB/T 6682规定的三级水。
3.2.115%(质量浓度)酒石酸溶液:称取酒石酸15g,加水溶解定容至100mL。
3.2.2氯 化钠。
3.2.3硅氧树脂:液态,工业级,作消泡用。
3.2.4盐酸(ρ=1.19 g/mL)。
3.2.5盐 酸溶液(1+9,体积比):取10 mL盐酸慢慢加入90 mL水中。
3.2.6乙醚。
3.2.7碳 酸氢钠。
3.2.8 1%(质量浓度)碳酸氢钠溶液:称取1g碳酸氢钠,以水溶解定容至100mL
3.2.9 2 mol/L氯化钠溶液:称取11.7g氯化钠,以水溶解定容至100mL
3.2.10 2 mol/L盐酸溶液:量取16.7mL盐酸加水定容至100mL
标准内容
中华人民共和国出入境检验检疫行业标准SN/T0859—2016
代替SN/T0859—2000
出口调味料中脱氢乙酸的测定
紫外分光光度法
Determination of dehydroacetic acid in condiments for export-Ultraviolet spectrophotometric method2016-08-23发布
中华人民共和国
国家质量监督检验检疫总局
数涂泵
2017-03-01实施
本标准按照GB/T1.1-2009给出的规则起草SN/T0859—2016
本标准代替SN/T0859—2000《进出口酱油中脱氢乙酸的测定方法》。本标准与SN/T0859-2000相比,除编辑性修改外主要技术变化如下:适用范围在原标准(酱油)的基础上,增加了醋、蚝油、烧烤汁、调味酱:-增加了定量检出限(LOQ)的规定。本标准由国家认证认可监督管理委员会提出并归口。本标准起草单位:中华人民共和国上海出人境检验检疫局、中华人民共和国广东出入境检验检疫局。
本标准主要起草人:陈丹萍、杨富春、褚庆华、原波、谢应新、黎敏华。本标准所代替标准的历次版本发布情况为:SN/T08592000。
1范围
出口调味料中脱氢乙酸的测定
紫外分光光度法
本标准规定了用紫外分光光度法测定出口调味料中脱氢乙酸含量的方法。SN/T0859—2016
本标准适用于出口酱油(生抽酱油、老抽酱油)、醋、蚝油、烧烤汁、调味酱中脱氢乙酸含量的测定。2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。GB/T6682分析实验室用水规格和试验方法3测定方法
3.1方法原理
样品中脱氢乙酸在酸性条件下经水蒸气蒸馏和有机溶剂萃取后,用紫外分光光度计在308nm波长处测定吸光度,与标准比较定量。3.2试剂和材料
除非另有规定,本方法所用试剂均为分析纯。水为GB/T6682规定的三级水。3.2.115%(质量浓度)酒石酸溶液:称取酒石酸15g,加水溶解定容至100mL。3.2.2氯化钠。
3.2.3硅氧树脂:液态,工业级,作消泡用。3.2.4
盐酸(p=1.19g/mL)。
盐酸溶液(1十9,体积比):取10mL盐酸慢慢加入90mL水中。3.2.5
乙醚。
碳酸氢钠。
1%(质量浓度)碳酸氢钠溶液:称取1g碳酸氢钠,以水溶解定容至100mL。3.2.8
3.2.92mol/L氯化钠溶液:称取11.7g氯化钠,以水溶解定容至100mL。2mol/L盐酸溶液:量取16.7mL盐酸加水定容至100mL。3.2.10
盐酸-氯化钠溶液:吸取2mol/l.氯化钠溶液(3.2.9)50mL和2mol/L盐酸溶液(3.2.10)3.2.11
1mL,混合后用水稀释至200mL。2无水硫酸钠。
3.2.13氢氧化钠。
3.2.140.1mol/L氢氧化钠溶液:称取4g氢氧化钠,以水溶解定容至1L。3.2.15脱氢乙酸标准溶液:精确称取0.1000g脱氢乙酸标准品于6mL(0.1mol/L.)氢氧化钠溶液(3.2.14)中,加水稀释至100mL,即浓度为1mg/mL的标准储备液。使用时用水稀释为20ug/mL脱氢乙酸标准工作液。
SN/T0859—2016
3.3仪器设备
紫外分光光度计,配1cm石英比色杯,波长范围110nm~900nm。水蒸气蒸馏装置。
旋涡混合器。
恒温水浴锅
感量0.01g的电子天平。
感量0.0001g的电子天平。
分析步骤
试样的蒸馏
称取10g(精确至0.01g)样品于100mL烧杯中,用100mL水分数次将样品全部转入500mL圆底烧瓶中,并用15%(质量浓度)酒石酸溶液(3.2.1调节样液至pH2~3,加人50g氯化钠(3.2.2)、2滴硅氧树脂(3.2.3)(样品蒸馏时若泡沫不多可不加)、数粒玻璃珠,加水至总体积250mL~300mL,连接水蒸气蒸留装置进行蒸馅。以每分钟收集10mL留出液的速度收集蒸液近200mL,转移入200ml容量瓶,用水定容,即为蒸馏液的总体积V3.4.2脱氢乙酸的提取及测定
3.4.2.1标准曲线的制作
吸取20ug/mL的脱氢乙酸标准溶液(3.2.15)0mL、1.00mL.2.00mL、3.00mL、4.00mL和5.00mL(相当于0μg.20.0ug、40.0μg、60.0μg、80.0μg和100.0ug脱氢乙酸)分别置于50mL带塞刻度玻璃试管中,分别加水至总体积10mL,然后分别加人0.8mL盐酸溶液(3,2.5)、2g氯化钠(3.2.2)。用乙醚(3.2.6)分3次(10mL、5mL、5mL)涡旋振摇提取,合并上层乙醚提取液于另一50mL带塞刻度玻璃试管中。将1%(质量浓度)碳酸氢钠溶液(3.2.8)分3次(10mL、5ml.5mL)加人已合并的乙醛提取液刻度玻璃试管中再次提取,合并下层碳酸氢钠提取液于烧杯中,置水浴上小心地加温,待乙醚挥发后,~5,分别移入25mL容量瓶中,加人2mL盐酸-氯化钠溶继续在水浴上滴加盐酸溶液(3.2.5)至PH3液(3.2.11),加水稀释至刻度,混匀。用1cm石英比色杯,以零管调节零点,于波长308nm处测吸光度,以脱氢乙酸的质量为横坐标,吸光度为纵坐标,绘制标准曲线3.4.2.2样品溶液的测定
移取3.4.1的蒸馏液10mL(V.)于50mL带塞刻度玻璃试管中,然后按照3.4.2.1的步骤执行。同时做试剂空白。根据样品溶液的吸光度由标准曲线计算得到样液中脱氢乙酸的质量mA,单位为微克(pg)。4脱氢乙酸含量的计算
按式(1)计算试释市脱氢乙酸的含量:X
式中:
mx×1000
mX(V/V)X1000
X试样中脱氢乙酸的含量,单位为毫克每千克(mg/kg);测定用样液中脱氢乙酸质量,单位为微克(pg);ma
一试样质量,单位为克(g);
V一试样蒸馅液总体积,单位为毫升(mL);2
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V:测定用蒸馏液体积,单位为毫升(mL)SN/T0859--2016
以重复性条件下获得的两次独立测定结果的算术平均值表示,结果保留三位有效数字。测定结果须扣除空白值。
精密度
在重复性条件下获得的两次独立测定结果的绝对差值不得超过算术平均值的10%。6
测定低限、回收率
测定低限
紫外分光光度法测定酱油(生抽酱油)、老抽酱油)、醋(米醋、添丁甜醋、陈醋)蚝油、烧烤汁、调味酱中脱氢乙酸含量的测定低限均为:30mg/kg。6.2回收率
回收率数据见表1.
酱油、醋、蚝油、烧烧汁和调味酱中脱氢乙酸添加浓度及其回收率实验数据表1
样品名称
酱油(鲜味生抽)
酱油(草菇老抽)
醋(米醋)
醋(添丁甜醋)
(陈酷)
烧烤汁
调味酱(甜辣酱)
添加水平/(mg/kg)
平均回收率/%
93.8-~100.0
92.7~101.8
95.5~~96.9
95.5~~106.3
90.0~97.9
93.4105.6
100.1~102.5
90.0~97.9
92.6~103.4
99.0~100.3
96.8~103.5
94.1~100.0
101.8-~104.7
97.7~104.6
97.9~107.9
97.8~~101.8
91.2~101.0
91.3~-100,0
97.4102.0
90.8~100.6
97.1~100.0
98.2102.0
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SN/T0859-—2016
Foreword
This standard is drafted in accordance with the rules given by GB/T 1.1-2009.This standard replaces SN/T 0859-2000 Method for the determination of dehydroacetic acid in soy-bean sauce for import and export.ComparedwithSN/T0859-2000,this standardhasthefollowingmaintechnical changesasfollowsScope of application on the basis of the original standard(soy sauce)increases vinegar,oystersauce.barbecuesauceandseasoning sauce.IncreasestheregulationofLimitofquantitation(LoQ)This standard is proposed by and is under the charge of the Certification and Accreditation Adminis-trationofthePeoplesRepublicof ChinaThis standard is drafted by Shanghai Entry-Exit Inspection and Quarantine Bureau,Guangdong EntryExitInspectionandQuarantineBureauThe main drafters of this standard are Chen DanpingYang Fuchun,Chu Qinghua,Yuan Bo,XieYingx-in,LiMinhua
Thepreviouspublicationsofthisstandardwas:SN/T0859—2000.
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SN/T0859—2016
Determination of dehydroacetic acid in condiments forexportUltravioletspectrophotometricmethodScope
This standard specifies determination of dehydroacetic acid in condiments for export by ultravioletspectrophotometricmethod.
This standard is suitable for determination of dehydroacetic acid in soy sauce,vinegar,oyster sauce,barbecue juiceandseasoningsauceforexport.2Normative reference
Referenced in this standard file for the application of this standard is necessary.Every notedate ref.erence documents,note the date of version only apply to the standard. Anyone who doesn't notedate reference documents,the latest version (including all the modified single)applicable to thisstandard.
Waterforanalytical laboratoryuse-SpecificationandtestmethodsGB/T6682
Determination method
3.1 Principle
Dehydroacetic acid in the sample is distilled under acidic condition and is extracted with organic sol-vent,which absorbance is determined with ultraviolet spectrophotometer at 308 nm wavelength andisdeterminedquantitativelywiththecomparisonof standard solutionsReagents and materials
Unless otherwise specified,the reagents used are allanalytically pure.Water is the level 3 stipulatedinGB/T6682.
15% (mass concentration)tartaric acid solution:Weigh 15 g tartaric acid,dissolves with3.2.1
water and set the volume to 100 mL.5
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SN/T0859—2016
Sodium chloride.
Silicaresin:liquid,industrialgradefordefoaminguse.3.2.4 Hydrochloricacid(p=1.19g/mL).3.2.5Hydrochloric acid solution(1+9,volume ratio):Add 10 mL of hydrochloric acid slowly to90 mL water.
3.2.6 Diethyl ether.
Sodium bicarbonate.
3.2.81% (mass concentration)Sodium bicarbonate solution: Weigh 1 g Sodium bicarbonate,dissolve withwater and set the volume to 100 mL.3.2.92mol/LSodiumchloridesolution:Weigh11.7gthe volume to 100 mL.
3.2.102mol/LHydrochloric acid solutiand set thevolume to 100 mL
dissolvewith waterandset
ydrochloricacid,dissolvewithwaterHydrochloricacid-SodiumchloridesolutionSodium chloride solution
Measure2mol/
(3.2.9)50mLand2mol/LHydrochloric acid solution(3.2.10)1mL.mixanddilutewithwaterto200mL.
Anhydroussodium sulfate.
Sodiumhydroxide
3.2.140.1mol/LSodiumhydroxidesolution:weigh4gsodiumhydroxide.dissolvewithwaterandsetthevolumeto1L.
3.2.15Dehydroacetic acid standard solution:Accurately weigh 0.100 0 g dehydroacetic acid standard ma-terial into 6mL0.1mol/L sodium hydroxide solution (3.2.14),dilute with water sand setthe volumeto100mL,that is thestandard stock solutionwiththeconcentrationof1mg/mL.Whenusing,dilutetothe concentration of 20 μg/mL dehydroacetic acid standard working solution.3.3Apparatusandequipment
3.3.1 Ultraviolet spectrophotometer,equipped with 1 cm quartz colorimetric cup and with thewavelength rangeof 110nm~900nm.6
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3.3.2Watervapordistillationapparatus.3.3.3Vortexmixer.
3.3.4Constant temperature water bath.3.3.5
Electronicbalance,accurateto0.01g3.3.6
Electronicbalance.accurate to0.0001g3.4Analysissteps
3.4.1 Distillation
SN/T0859—2016
Weigh 10g(Accurate to0.01g)sampleto100ml beaker,transfer it intoa 500 mL round-bottomedflask withtotalvolume of 100 mL water for several times.Use 15% (mass concentration)tartaricacidsolution(3.2.1)toadjustthepHto2~3.add50gsodlitim.chloride(3.2.2).2dropsofsilicaresin(3.2.3)(ifavailable),severalglassbeads,addwatertothetotalvolumeof250mL~300mL.connectthe flask to the water vapor distillation apparatus and distill Collect the condensation with the speedof 10 mL per minute until nearly200 mL.Transfer the liguid into 200 mL volumetric flask and set thevolumewithwaterwhichisthevolume of thedistilled liquidVy.3.4.2 Extraction and determination3.4.2.1Standard curve
standard.solution(32.15)o.0mL,1.0mL.2.0mL,Separatelyshift2oug/mLdehydroaceticacid3.0mL,4.0mLand5.0mL,whichequal to0.00μg.20.0μg.40.0ug.60.0ug.80.0μgand100.0μgde-mLgraduatedglasstube
hydroacetic acid respectively.into a 50with stopper.add water to the totalvolumeof10mL,theninturnadd0.8mL hydrochloricacid solution(3.2.5)and2gsodiumchloride(3.2.2).Add10mL,5mLand5mLdiethylether(3.2.6)extract withvortexvibration,combinetheupper ether layer into another50 mL graduated glass tube with stopper.Add 10 mL,5 mL and5 mL1% sodiumbicarbonate solution(3.2.8)to the second50 mLgraduatedglasstube with stopper toextract,combine the lower sodium bicarbonate layer into a beaker,carefully heat on the water bath.While diethyl ether volatilized,keep the beaker still on the water bath,drophydrochloric acid solution(3.2.5)topH3~5.Respectivelytransferthesolutions above intoa25mL volumetricflask and add2mLhydrochloric acid-sodium chloride solution(3.2.11),dilutetovolume withwater and mix thor-oughly.Determine the absorbance of solutions with 1 cm quartz colorimetric cup and adjust zeropoint with the solution of O μg/mL.Draw the standard curve,with the quality of dehydroacetic acid asX-axisandtheabsorbanceunder308nmasY-axis.SN/T0859—2016
Samplebzxz.net
Takedistillation liquid 10mL(3.4.1)(V,)in a 50mL 50 mL graduated glasstube with stopper,andfollowthestepof3.4.2.1.Atthesametime.carryonreagentblanktest.Accordingtotheabsorbanceof the sample solution,calculate the mass of dehydroacetic acid in the sample(ma)with standardcurve.
Thecalculation of dehydroacetic acid content4
Accordingto thecalculationformula(1),calculatedehydroacetic acidcontent in the sample.X:
Inthecalculationformula:
ma×1000
mx(V2/V,)x1000
X-Dehydroaceticacidcontentofasample,mg/kgma—Thequalityofthedeterminationof dehydroaceticacid in sample solution,ug.m-Samplequality.g
V,-The distilled liquid sample volume,mLV,-Determinationofdistilled liguidproduct.mL5Precision
(1)
Under the condition of the repeatability of the absolute difference between two independent determination results shall not exceed 10% of thearithmetic averagevalue.6 Limit of quantitation and recovery6.1Limit of quantitation
Limit of quantitation for determination of dehydroacetic acid contents in soy sauce (containing lightsoya sauce and soy sauce),vinegar(containing rice vinegar,sweetened vinegar and mature vinegar),oyster sauce,barbecue sauce and seasoning sauce with ultraviolet spectrophotometric method is30mg/kg.
Recoveries
Recoverydataislisted intable1Table1
SN/T0859—2016
Recoveries of soy sauce,vinegar,oyster sauce,barbecue sauce and seasoning ofdehydroacetic acid in standard material additional experimentsSample
Soy sauce
(light soya sauce)
SQysauce
(darksoysaucemadefrom
straw.mushrooms)
Vinegar
(ricewine)
Sweetened vinegar
Vinegar
(maturevinegar)
Oyster sauce
Barbecue sauce
Seasoning sauce
(sweet chili sauce)
Additionlevel/(mg/kg)
Average recovery/%
93.8~100.0
92.7~101.8
95.5~96.9
95.5~106.3
93.1~98.2
97.7~98.8
90.0~97.9
93.4~105.6
100.1~102.5
90.0~97.9
92.6~103.4
99.0~100.3
96.8~103.5
94.1~100.0
101.8~104.7
97.7~104.6
97.9~107.9
97.8~101.8
91.2~101.0
91.3~100.0
97.4~102.0
90.8~100.6
97.1~100.0
98.2~102.0
SN/T0859-2016
中华人民共和国出入境检验检疫行业标准
出口调味料中脱氢乙酸的测定
紫外分光光度法
SN/T0859—-2016
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