Carbohydrate and acid contents of Gala apples and Bartlett pears from regular and controlled atmosphere storage

Gala apples and Bartlett pears were harvested over two crop seasons at diff erent maturities and growing sources then stored in refrigerated storage al one and in controlled atmosphere storage (1% O-2 plus 1% CO2 or 2% O-2 plus 3% CO2) Before and after storage of 45 or 90 days, the juice from the frui t was examined for carbohydrate and acid compositions and contents. For Gal a apples, the type and length of storage had no significant effect on juice carbohydrate and acid contents and compositions, whereas the time of harve st greatly influenced both parameters. Storage atmosphere did not affect th e carbohydrate and acid contents and compositions of Bartlett pear juice; h owever, the source of the fruit and subsequent amount of ripening did appea r to significantly cause changes in the same parameters. The carbohydrate a nd acid compositions and contents of Gala apple juice were within the compo sitional range for worldwide apple juice. Bartlett pear juice contained sig nificantly greater concentrations of citric acid than shown in previously p ublished studies.