Studies in the Natural Coating of Apples II. Changes in the Fractions During Storage

Abstract

The oil fraction of the natural coating of Granny Smith apples increased during storage and reached a maximum at 3-4 times its original concentration. The increase was reduced by "gas" storage (in 5 per cent. CO2, 16 per cent. 2 ), Later pickings had a higher oil content. The iodine number of the oil increased with increasing concentration. Smaller increases occurred in the wax, ursolic acid, and "cutin" fractions after prolonged storage.