Abstract
Fiber composition of seven varieties of apple; Red Delicious, Golden Delicious, Granny Smith, McIntosh, Stayman, Red Rome, and York were studied. Hydrolyzates of fiber fractions from fruit samples of these varieties were analyzed for rhamnose, fucose, arabinose, xylose, mannose, galactose, and glucose content. Fiber composition of Red Delicious and Golden Delicious apples at different developmental stages were also studied. Fruit were analyzed every 15 days starting from 30 days after fruit set through maturity. Marked varietal difference was observed in the rhamnose, fucose, galactose, and mannose content of apple fiber. The difference in arabinose, xylose, and glucose content was less prominent except for York apples which were found to have markedly lower xylose content than other varieties and McIntosh with lower glucose content than other varieties. Both Red and Golden Delicious apple fiber showed gradual increase in xylose and glucose content during fruit development. Other component sugars were also found to change during development.
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