来宝网 2012/4/12点击3082次
<p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’">本方法引用标准及应用范围</span><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; text-indent: 15.75pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">本方法完全满足<font face="Times New Roman">GB/T17377-2008</font><font face="宋体">《动植物油脂 脂肪酸甲酯的气相色谱分析》以及</font><font face="Times New Roman">GB/T17376-2008</font><font face="宋体">《动植物油脂 脂肪酸甲酯制备》中的规定。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’">本方法可以检测下列各种植物油品种</span><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; text-indent: 15.75pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">1<font face="宋体">）豆油，主要脂肪酸组成是亚油酸</font><font face="Times New Roman">50%</font><font face="宋体">－</font><font face="Times New Roman">55%</font><font face="宋体">，油酸</font><font face="Times New Roman">22%</font><font face="宋体">－</font><font face="Times New Roman">25%</font><font face="宋体">，棕榈酸</font><font face="Times New Roman">10%</font><font face="宋体">－</font><font face="Times New Roman">12%</font><font face="宋体">，亚麻酸</font><font face="Times New Roman">7%</font><font face="宋体">－</font><font face="Times New Roman">9%</font><font face="宋体">。亚油酸和α－亚麻酸是两种人体必需的脂肪酸。精炼豆油中维生素</font><font face="Times New Roman">E</font><font face="宋体">的含量为</font><font face="Times New Roman">60</font><font face="宋体">－</font><font face="Times New Roman">110mg/100g</font><font face="宋体">。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 2<font face="宋体">）菜籽油，其脂肪酸的组成受气候、品种等的影响较大。菜籽油中含有较多可能对健康不利的芥酸，其主要脂肪酸组成是亚油酸</font><font face="Times New Roman">10%</font><font face="宋体">－</font><font face="Times New Roman">20%</font><font face="宋体">，油酸</font><font face="Times New Roman">10%</font><font face="宋体">－</font><font face="Times New Roman">35%</font><font face="宋体">，棕榈酸</font><font face="Times New Roman">2%</font><font face="宋体">－</font><font face="Times New Roman">5%</font><font face="宋体">，亚麻酸</font><font face="Times New Roman">5%</font><font face="宋体">－</font><font face="Times New Roman">15%</font><font face="宋体">，芥酸</font><font face="Times New Roman">25%</font><font face="宋体">－</font><font face="Times New Roman">55%</font><font face="宋体">，花生四烯酸</font><font face="Times New Roman">7%</font><font face="宋体">－</font><font face="Times New Roman">14%</font><font face="宋体">。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 3<font face="宋体">）花生油，具有独特的花生气味和风味，可直接用于制造起酥油、人造奶油、蛋黄酱，也是良好的煎炸油。花生油的脂肪酸组成比较独特，含有</font><font face="Times New Roman">6%</font><font face="宋体">－</font><font face="Times New Roman">7%</font><font face="宋体">的长链脂肪酸，因此，花生油具有良好的氧化稳定性。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 4<font face="宋体">）玉米油，又称为玉米胚芽油、粟米油，主要脂肪酸组成是亚油酸</font><font face="Times New Roman">55%</font><font face="宋体">－</font><font face="Times New Roman">60%</font><font face="宋体">，油酸</font><font face="Times New Roman">25%</font><font face="宋体">－</font><font face="Times New Roman">30%</font><font face="宋体">，棕榈酸</font><font face="Times New Roman">10%</font><font face="宋体">－</font><font face="Times New Roman">12%</font><font face="宋体">，亚麻酸</font><font face="Times New Roman">2%</font><font face="宋体">以下。玉米油含亚油酸高，其降血清胆固醇的效能优于其他油脂。又由于玉米油富含维生素</font><font face="Times New Roman">E</font><font face="宋体">，所以，其氧化稳定性也较好。</font><font face="Times New Roman"> </font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 5<font face="宋体">）葵花籽油，是为数不多的高亚油酸油脂之一，故有人将它与玉米油列为“健康保健油脂”。其主要脂肪酸组成是亚油酸</font><font face="Times New Roman">65%</font><font face="宋体">－</font><font face="Times New Roman">78%</font><font face="宋体">，油酸</font><font face="Times New Roman">14%</font><font face="宋体">－</font><font face="Times New Roman">17%</font><font face="宋体">，棕榈酸</font><font face="Times New Roman">6%</font><font face="宋体">－</font><font face="Times New Roman">8%</font><font face="宋体">，硬脂酸</font><font face="Times New Roman">2%</font><font face="宋体">－</font><font face="Times New Roman">3%</font><font face="宋体">，维生素</font><font face="Times New Roman">E</font><font face="宋体">的含量为</font><font face="Times New Roman">100mg/100g</font><font face="宋体">，还含有绿原酸，其氧化稳定性好，但它不宜单独用于煎炸食品。</font><font face="Times New Roman"> </font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 6<font face="宋体">）</font><font face="Times New Roman"> </font><font face="宋体">橄榄油，是从油橄榄鲜果中直接压榨出来的果汁，分离掉其中的水分后取得。单不饱和脂肪酸含量高达</font><font face="Times New Roman">80%</font><font face="宋体">以上，必需脂肪酸亚油酸与亚麻酸的比例为</font><font face="Times New Roman">1</font><font face="宋体">：</font><font face="Times New Roman">4</font><font face="宋体">，正好符合人体对摄入脂肪的标准，对人体健康尤其是心脏健康有益。世界卫生组织调查表明，以橄榄油为首选食用油的希腊，心血管系统和癌症发病率极低。</font><font face="Times New Roman"> </font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><br /> </span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"> 7<font face="宋体">）</font><font face="Times New Roman"> </font><font face="宋体">茶油，是利用油茶的种子榨制的一种优质食用油。茶油含有丰富的维生素</font><font face="Times New Roman">E</font><font face="宋体">、</font><font face="Times New Roman">D</font><font face="宋体">、</font><font face="Times New Roman">K</font><font face="宋体">和－胡萝卜素，不饱和脂肪酸含量高达</font><font face="Times New Roman">85%</font><font face="宋体">－</font><font face="Times New Roman">97%</font><font face="宋体">，比橄榄油的含量还要高，茶油还含有茶多酚和茶皂甙，对降低胆固醇和抗癌有明显的功效。二、二、实验原理</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">本实验甲酯化方法采用国标<font face="Times New Roman">GB/T 17376-2008</font><font face="宋体">，甘油酯皂化后，释出的脂肪酸进行酯化，萃取得到脂肪酸甲酯用于气相色谱分析。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">样品中的脂肪酸经过适当的前处理（甲酯化）后，进样，样品在汽化室被汽化，在一定的温度下，汽化的样品随载气通过色谱柱，由于样品中组分与固定相间相互用的强弱不同而被逐一分离，分离后的组分，到达检测器时经检测口的相应处理，产生可检测的信号。根据色谱峰的保留时间定性，归一法确定不同脂肪酸的百分含量。</span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’">仪器及试剂配置</span><span style="font-family: ’宋体’; font-size: 10.5pt; font-weight: bold; mso-spacerun: ’yes’"><o:p></o:p></span></p> <p> <table style="padding-bottom: 0pt; padding-left: 5.4pt; padding-right: 5.4pt; border-collapse: collapse; margin-left: -3.6pt; padding-top: 0pt; mso-table-layout-alt: fixed"> <tbody> <tr style="height: 7.25pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: rgb(0,0,0) 0.5pt solid; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">检测项目</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: rgb(0,0,0) 0.5pt solid; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">植物油中脂肪酸的测定</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="height: 3.5pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">色谱仪器型号</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">GC5890<font face="宋体">型色谱仪 配有</font><font face="Times New Roman">FID</font><font face="宋体">检测器</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="height: 3.5pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">毛细管色谱柱</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">PEG-20M30*0.32*0.5<font face="宋体">专用柱</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="height: 3.5pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">色谱工作站<font face="Times New Roman">N2000</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">（电脑<font face="Times New Roman">1</font><font face="宋体">台自备）</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="height: 3.5pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: rgb(255,255,255) 31.875pt; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 31.8750pt none rgb(255,255,255)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">氮氢空发生器</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: rgb(255,255,255) 31.875pt; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 31.8750pt none rgb(255,255,255)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">HGT300E 1<font face="宋体">台或高纯氮、氢气、空气钢瓶各一瓶</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="height: 23.25pt"> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: rgb(0,0,0) 0.5pt solid; padding-bottom: 0pt; padding-left: 5.4pt; width: 144pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: 0.5000pt solid rgb(0,0,0); mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="192"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">其它仪器</span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> <td style="border-bottom: rgb(0,0,0) 0.5pt solid; border-left: medium none; padding-bottom: 0pt; padding-left: 5.4pt; width: 270pt; padding-right: 5.4pt; border-top: medium none; border-right: rgb(0,0,0) 0.5pt solid; padding-top: 0pt; mso-border-bottom-alt: 0.5000pt solid rgb(0,0,0); mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0,0,0); mso-border-top-alt: 0.5000pt solid rgb(0,0,0)" valign="top" width="360"> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">1<font face="宋体">．恒温水浴锅</font><font face="Times New Roman">2</font><font face="宋体">．移液管</font><font face="Times New Roman">3</font><font face="宋体">．胶头滴管</font><font face="Times New Roman">4</font><font face="宋体">．小圆底烧瓶</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> <p style="text-align: center; margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">5<font face="宋体">．冷凝管</font><font face="Times New Roman">6. </font><font face="宋体">样品瓶</font></span><span style="font-family: ’宋体’; font-size: 10.5pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> </p> <p style="margin-top: 0pt; margin-bottom: 0pt" class="p0"><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’">试剂：<font face="Times New Roman">.</font><font face="宋体">石油醚、乙醚、氢氧化钾、甲醇均为</font><font face="Times New Roman">AR</font><font face="宋体">级。</font></span><span style="font-family: ’宋体’; font-size: 10.5pt; mso-spacerun: ’yes’"><o:p></o:p></span></p> <!--EndFragment-->
