Samples are extracted with methanol.L-ascorbyl palmitate in the methanol extract is hydrolyzed under acid condition,and 2,6-dichlorophenol indophenol sodium solution is titrated with the hydrolysate.

• 用甲醇对油样中L-抗坏血酸棕榈酸酯进行提取,对提取物在酸性条件下水解,用水解产物对2,6-二氯酚靛酚钠溶液进行滴定。