Base from my experience, dragon fruit can be stored for one month under refrigerated condition . The same can be done for rejects, fruits with cracks and surface spots. I you want to store them for longer periods, I recommend to process them to wine, juice or anything you want.
Procedures for making Dragon Fruit Juice
1 . Wash dragon fruits in running water to remove all dirts.
2. Remove undesirable parts.
3 Cut in quarters and peel off the skin. Peeling can be conveniently done by hand like the peel of mango.
4. Blend in waring blender. Adjust sugar content to 15 degree Brix. If refractometer is not available, add sugar until the sweetness is comparable to ripe grapes.
5. Pasteurize at 75 degree C for 15 minutes.
6. Pack immediately in air tight bottle and seal.
Adding preservatives to prolong shelf life can be done but not recommended.