Chen et al. [29] studied the effect of processing methods on changes of color, carotenoids and vitamin A contents in carrot juice. As carrots are low-acid (pH 5.5–6.5) foods, the sterilization of carrot juice under high temperature is often required. However, this treatment can result in great loss of color [135]. To minimize loss of color and carotenoid content, the raw carrot juice is often acidified before pro- cessing so that the sterilization can be lowered. Results indicated that after the carrot juice was heated immediately following acidification, the short exposure time of b-car- otene to acid did not result in isomerization. It has been reported that blanching carrots with acid can increase the brightness of carrot juice and decrease the precipitation of carrot juice during processing [135]. Sims et al. [131] also demonstrated that blanching carrots with acid can improve the color and turbidity of heated or canned juice.