Zhouzhi Kiwifruit

 Tips for Preparing and Cooking

Tips for Preparing Kiwifruit

Kiwifruits are so delicious that they can be eaten as is. They can be peeled with a paring knife and then sliced or you can cut them in half and scoop the flesh out with a spoon. You can also enjoy the skins which are very thin like a Bosc pear and are full of nutrients and fiber; the peachlike fuzz can be rubbed off before eating.

Kiwifruits should not be eaten too long after cutting since they contain enzymes (actinic and bromic acids) that act as a food tenderizer, with the ability to further tenderize the kiwifruit itself and make it overly soft. Consequently, if you are adding kiwifruit to fruit salad, you should do so at the last minute so as to prevent the other fruits from becoming too soggy.

While sliced kiwi fruit may soften other fruits when combined in fruit salad, a study published in the June 2006 issue of the Journal of Agricultural and Food Chemistry has found that minimal processing of kiwi and other fruits—cutting, packaging and chilling—does not significantly affect their nutritional content even after 6, and up to 9, days.

Researchers cut up kiwi fruit, pineapples, mangoes, cantaloupes, watermelons, and strawberries. The freshly cut fruits were then rinsed in water, dried, packaged in clamshells (not gastight) and stored at 41 degrees Fahrenheit.

After 6 days, losses in vitamin C were less than 5% in mango, strawberry, and watermelon pieces, 10% in pineapple pieces, 12% in kiwifruit slices, and 25% in cantaloupe cubes.

No losses in carotenoids were found in kiwifruit slices and watermelon cubes. Pineapples lost 25%, followed by 10-15% in cantaloupe, mango, and strawberry pieces.

No significant losses in phenolic phytonutrients were found in any of the fresh-cut fruit products.

"Contrary to expectations, it was clear that minimal processing had almost no effect on the main antioxidant constituents. The changes in nutrient antioxidants observed during nine days at five degrees Celsius would not significantly affect the nutrient quality of fresh cut fruit. In general, fresh-cut fruits visually spoil before any significant nutrient loss occurs," wrote lead researcher Maria Gil.

In practical terms, this means that you can prepare a large bowl of fruit salad on the weekend, store it in the refrigerator, and enjoy it all week, receiving almost all the nutritional benefits of just prepared fruit salad. To ensure kiwi fruit does not "tenderize" the other fruits in your salad, store sliced kiwi in a separate air-tight container and add to the rest of the fruit salad just before serving.

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