Study on Shelf Life of Pressed Walnut Oil Based on Double Test Temperature Method
In order to determine the shelf life of walnut oil pressed at 130℃working temperature of oil press,the peroxide value,acid value,refractive index,relative density,color,odor and taste of the insulation samples were determined by double test temperature method.The results showed that the shelf life of walnut oil was 133 days when the holding temperature was(53±1)℃.When the holding temperature was(63±1)℃,the shelf life of walnut oil was 70 days.The theoretical shelf life of walnut oil at room temperature of 25℃was 802 days,which was about 255 days longer than that of walnut oil label value(18 months,about 547 days).During the holding period,the peroxide value of walnut oil samples exceeded 0.20 g/100 g specified in T/YFEA 0007-2021.The other test indexes met the requirements of GB/T 22327-2019,and the highest acid value was only 0.30 mg·g-1,which was far lower than the standard first-class product limit of 1.0 mg·g-1.
walnut oildouble test temperaturerapid oxidationshelf life
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