1）品係
2）產地
3）貯藏時間長短
4）加工方式
等等。
剛才下麵有位朋友說葵花籽油多不飽和脂肪酸高，單不飽和脂肪酸低。這是一般書本的說法。
在真實的世界裏，不說別的因素，隻說葵花籽的品係。
的確有高多不飽和脂肪酸（Omega 6）的品係，但也有平衡品係和高單不飽和脂肪酸品係。都是葵花籽，數據可以有本質區別。
轉：
There are four types of sunflower oil available in the United States, all of which are made from sunflower seeds that are bred to produce different fatty acid compositions.
These include high linoleic (68% linoleic acid), mid-oleic (NuSun, 65% oleic acid), high oleic (82% oleic acid), and high stearic/high oleic (Nutrisun, 72% oleic acid, 18% stearic acid) (1).
As their names suggest, some sunflower oils are higher in either linoleic or oleic acid.
Linoleic acid, commonly known as omega-6, is a polyunsaturated fatty acid that has two double bonds in its carbon chain. Meanwhile, oleic acid, or omega-9, is a monounsaturated fatty acid with one double bond. These properties make them liquid at room temperature (2).
問題是，買葵花籽油的時候我們怎麽能確知是那種品係，真實的數字是什麽？
