Browning and haze in apple juice concentrate (AJC) have been long-standing problems in processing and there is no reliable solution to them.

• 苹果浓缩汁褐变、后混浊一直是困扰着我国乃至世界果汁加工业的重大技术难题，目前尚无成熟可靠的控制方法。 褐变、后混浊严重影响果汁的品质，增加了我国果汁出口的难度。