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Did You Know...Ion Exchange and Adsorbent Resins Remove Bitter Compounds and Acids From Citrus Juice — Such as Grapefruit, Orange, and Lemon — Making Them Sweeter and More Delicious?
Bitterness stems largely from limonin and naringin compounds found in these fruits. Limonin is a bitter, white, crystalline substance found in citrus and other plants. The bitterness of the juice increases during extraction from the fruit and subsequent pasteurization with heat – a process known as “delayed bitterness,” which is a major problem of the citrus industry worldwide.
Over 95% of the delayed bitterness can be removed by passing the juice through a column of debittering adsorbent resin. Weak base anion resins can effectively reduce excess acids and control the pH of the juice in low energy, more environmentally sustainable process.