橄榄油怎么凝结了?

(2009-04-27 16:23:50)
标签: 橄榄油
       前段时间,家里常用的茶油用完了,想起柜子里还有一瓶初榨橄榄油,找出来一看,怎么凝结了?瓶子底部有絮状的沉淀物,还有一些凝结的颗粒悬浮在中间。难道坏了,看日期还在保质期内的呀?
     上网,用“橄榄油”、“凝结”这两个关键字搜索,找到了答案:

    橄榄油的燃点低,很容易凝固,在温度比较低的时候会出现一些白色沉淀物,这是很正常的。

    橄榄油低温出现浑浊是正常现象。因为其中含有不同比例的腊质物(WAX)在低温下会凝结。每个等级的橄榄油蜡的含量国际橄榄油理事会和欧盟橄榄油标准都有规定。初榨橄榄油蜡含量标准是小于等于250mg/kg。

    橄榄油的蜡含量同一生产商不同年份/不同批次的产品都会有所不同。橄榄油的蜡含量取决于橄榄果,橄榄果的蜡含量受产地和树种的影响。即使同一产地,同一品种也会因每年的气候条件的变化有不同的蜡含量。它不象水那样有固定的冰点。

     原来如此,过去我在温暖的南方沿海地区居住,也用过橄榄油,冬天的气温很少低于10度,从来没有遇到过这种状况。今天第一次在这么冷的地方过冬,橄榄油竟然都结住了。

        后来去一个室温很低的大超市,发现那里的橄榄油也都凝结了,再次证明了这个特性。

    最近,气温逐渐回升,橄榄油也恢复了正常的液态。

    特写一篇日志,供大家参考。

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