嬰兒奶粉過氧化值測定方法的研究

食品科學論文編號:SP071  論文字數:9503,頁數:29

目  錄
中文摘要 I
英文摘要 II
目錄 III
1. 緒論 1
 1.1 引言 1
 1.2嬰兒奶粉中不飽和脂肪酸含量 1 
 1.3嬰兒奶粉脂肪氧化機理 2
 1.4測定過氧化值的意義 3
2. 實驗部分 4
 2.1實驗材料與設備  4
 2.2實驗主要試劑 4
 2.3實驗方法 5
3. 結果與討論 8
 3.1脂肪提取的方法 8
 3.2五種檢測方法    11
 3.3精密度測定 19
4．總結與展望 23
致謝 24
參考文獻 25

摘 要：至今為止，我國仍沒有檢測奶粉過氧化值的國標法，而嬰兒奶粉中脂肪含量達到27%，其中不飽和脂肪酸占了大半，所以脂肪過氧化值仍是測定奶粉質量的一個重要指標。奶粉中過氧化物的含量很低，所以用油脂滴定法很難準確測定。本論文主要研究內容是奶粉脂肪提取方法的確定和優化，以及應用三種碘量比色法、鐵離子法及澳大利亞AS2300-8-6-2004法來測定奶粉中脂肪的過氧化值。實驗結果表明超聲波萃取法的脂肪提取率可以達到81.89%，且優化后提取率達到92.9%；AS2300-8-6-2004測定方法比較簡便且精密度最高（相對偏差為0.18），鐵離子法其次，三種碘量比色法的準確性不高且操作過程十分復雜。所以采取超聲波萃取法提取脂肪及AS2300-8-6-2004法來測定奶粉中脂肪的過氧化值。
關鍵詞：奶粉；脂肪；過氧化值；測定方法

Abstract: From now on, there is no original method to determinate the peroxide value of dry milk in our country. But the percent of fat in the infant formula is almost 27%, and most of which is unsaturated fatty acid, so the peroxide value is a very important norm to determine whether a kind of dry milk is good. The number of  peroxide in the dry milk is very little, so it’s hard to use the means like oli. This paper studies to choose a good method to take fat from dry milk, and how to determinate the peroxide value of dry milk. There are three methods of iodometry colorimetry. The method of ferric ion and a method based on the mean of determinate the peroxide value of milk fat of Australia. The experiment results show that the ultrasonic method had a 81.89% extraction rate. And the precision of Australia method is best the relative deviation is (0.18), then is the method of ferric ion ,the last is three methods of iodometry colorimnate. So use the ultrasonic method to take fat and the method of AS2300-8-6-2004 to determinate the peroxide value.
 Keywords：infant formula, fat, peroxide value，measuring method