充氮储藏的菜籽油食用期品质变化

Changes in quality of rapeseed oil with nitrogen storage during consumption period

以不添加抗氧化剂的一级菜籽油为原料,酸价、过氧化值、p-茴香胺值为监测指标,在模拟家庭食用期储藏条件下,探讨了充氮储藏的菜籽油(2. 5 L/桶)在3个月食用期内的品质变化规律。结果表明:充氮储藏的菜籽油在3个月的食用期内酸价(KOH)未超过一级菜籽油的限量值0. 2 mg/g;充氮储藏的菜籽油比空白对照组的过氧化值达到5. 0 mmol/kg的时间延长了20 d;充氮储藏的菜籽油p-茴香胺值的变化较为平缓,在前30 d内变化不大。充氮储藏提高了菜籽油的氧化稳定性,该储藏方法可以成为菜籽油的一种新型绿色的储藏技术。

The first-grade rapeseed oil without antioxidant was used as raw material,and the acid value,peroxide value and p-anisidine value were used as monitoring indicators to explore the law of the change in the quality of rapeseed oil(2.5 L/barrel)with nitrogen storage in the simulated domestic consumption period.The results showed that the acid value of rapeseed oil with nitrogen storage did not exceed the limit value(0.2 mgKOH/g)of first-grade rapeseed oil in three months’consumption period.For the rapeseed oil with nitrogen storage,the time when the peroxide value reached 5.0 mmol/kg was longer than that of the blank control group by 20 d.The change of p-anisidine value of rapeseed oil with nitrogen storage was relatively flat,and did not change much in the first 30 d.Nitrogen storage could improve the oxidative stability of rapeseed oil,and it might be a new green storage technology for rapeseed oil.