植物的成分永远测不准，因为有影响的因素太多，不可能有单一标准和数据

1）品系

2）产地

3）贮藏时间长短

4）加工方式

等等。

刚才下面有位朋友说葵花籽油多不饱和脂肪酸高，单不饱和脂肪酸低。这是一般书本的说法。

在真实的世界里，不说别的因素，只说葵花籽的品系。

的确有高多不饱和脂肪酸（Omega 6）的品系，但也有平衡品系和高单不饱和脂肪酸品系。都是葵花籽，数据可以有本质区别。

转：

Different types of sunflower oil

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) (1Trusted Source).

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 (2Trusted Source).

问题是，买葵花籽油的时候我们怎么能确知是那种品系，真实的数字是什么？