OZONE IN RELATION TO STORAGE OF APPLES 23 



SUMMARY 



The chief values of ozone in apple storage are its maintenance of 

 a pleasant atmosphere in the storage room and the control of surface 

 molds on packages and walls. 



Ozone did not control decay of apples, and it did not reduce infec- 

 tion of inoculated wounds. It did, however, retard the rate of en- 

 largement of the infected areas. 



Spores of Penicillium expansum unprotected by fruit tissue or other 

 organic matter were killed by continuous exposure to ozone. Colonies 

 established on package surfaces, however, were very resistant and 

 were not killed by continuous exposure for 5 months to an atmosphere 

 containing 3.25 p. p. m. of ozone. 



Scald was not controlled by ozone, but its development was reduced. 



Fruit was injured by a daily exposure to 3.25 p. p. m. of ozone. 

 The exposure period required to produce injury and the degree of 

 injury varied with the variety. No fruit was injured by daily ex- 

 posure for 5 months to 1.95 p. p. m. 



The flavor of all varieties tested except Golden Delicious was im- 

 paired by 3.25 p. p. m. of ozone, but no impairment by 1.95 p. p. m. 

 was detected for any variety tested. 



The cuticle of some varieties became sticky and varnishlike in the 

 presence of ozone. 



No differences in the physiological properties of ozonized and 

 nonozonized fruit were detected. 



LITERATURE CITED 



(1) Baker, C. E. 



1933. effect of ozone upon apples in cold storage. Ice and Refrig. 

 84 : 402-404, illus. 



(2) Brooks, C, Cooley, J. S., and Fisher, D. F. 



1919. NATURE AND CONTROL OF APPLE-SCALD. J0U1\ AgT. Res. 18 : 211-240, 



illus. 



(3) Doeda, C. 



1940. adding ozone to fermentation vats, (to Hefe-Patents G. m. b. H.) 

 Ger. 700,492, Nov. 21, 1940 (CI. 6a. 15.03). [Abstract in Chem. 

 Abs. 35 : 7110. 1941.] 



(4) Elford, W. J., and Ende, J. van den. 



1942. AN investigation of the merits of ozone as an aerial disinfectant. 

 Jour. Hyg. [Cambridge] 42 : 240-265, illus. 



(5) Ewell, A. W. 



1930. the disappearance of szone in cold storage rooms. Refrig. Engin. 

 20: 358-360, illus. 



(6) 

 (7) 

 (8) 

 (9) 

 (10) 



1936. the use of ozone in cold storage plants. Ice and Refrig. 91 : 

 295-296. 



1938. present use and future prospects of ozone in food storage. Food 

 Res. 3: 101-108. 



1941. RESEARCHES ON ULTRA VIOLET LIGHT AND OZONE AND THEIR RELATIONS 



as germicidal agents. Refrig. Engin. 41 : 331-334, illus. 



1942. allies of refrigeration in food preservation. Refrig. Engin. 

 43 : 159-161. 



1916. ozone and light : ti. ozone. In Amer. Soc Refrig. Engin., The 

 Refrigerating Data Book : Refrigeration Applications Volume. 

 Ed. 2, Sect. II. Cold Storage Practice. Chap. 18, pp. 196-199. 

 Menasha, Wis. 



