Cooperative research by the Florida Citrus Experiment Station and the Florida Citrus Commission. Florida Agricultural Experiment Stations Journal Series, No. 1682.
Seasonal Changes Occurring in the Pectinesterase Activity and Pectic Constituents of the Component Parts of Citrus Fruits II. Pineapple Orangesa
Version of Record online: 25 AUG 2006
Journal of Food Science
Volume 29, Issue 1, pages 34–39, January 1964
How to Cite
ROUSE, A. H., ATKINS, C.D. and MOORE, E. L. (1964), Seasonal Changes Occurring in the Pectinesterase Activity and Pectic Constituents of the Component Parts of Citrus Fruits II. Pineapple Oranges. Journal of Food Science, 29: 34–39. doi: 10.1111/j.1365-2621.1964.tb01690.x
- Issue online: 25 AUG 2006
- Version of Record online: 25 AUG 2006
- Manuscript received June 24, 1963
Pectinesterase activity, 3 pectic fractions, and other characteristics were determined periodically on 5 component parts of Pineapple oranges during a 9.month maturation cycle for 2 seasons. Generally, PE activity was greatest in the peel, membrane, and juice sacs in March, April, and May, when the Brix/acid ratio was highest. However, the activity varied in similar components for like months during the 2 seasons. The order of component parts for PE in most cases, from highest to lowest activity, was juice sacs, membrane, peel, seeds, and juice. Total PE in the average whole orange attained maximum activity in March and April. Over 52% of the activity present was found in the juice sacs, which represented about 22.5% of the whole fruit. Water-soluble pectin increased slightly in the peel and membrane, remained somewhat irregular in the juice sacs, and decreased to a constant level in the seeds throughout the growing season. Ammonium-oxalate-soluble pectin in the peel decreased slightly, and in the other components was either irregular or increased slightly, during maturation. Quantity of protopectin was greatest in the membrane and generally decreased toward the end of the sampling period in the various components. Total pectin and weight of the average whole orange was greater in the 1961–62 season than in the preceding season.