Effect of Gamma Radiation Upon Cherries

Abstract

SUMMARY The effect of gamma radiation upon the quality of sweet cherries was studied. Softening was detected which progressed rapidly above a threshold dose of approximately 50 kilorads and was related to the degradation of pectic constituents of the fruit. Although respiratory O2 consumption and CO2 evolution were stimulated during irradiation, the response subsided slowly after irradiation ceased. Color bleaching occurred only at the high doses. Despite a marked initial reduction in microbial contamination, extended storage periods showed increased microbial spoilage. A reduction in the development of brown‐rot during high‐temperature short‐time storage resulted from kilorad doses of radiation. There was a slightly increased rate of sulfur dioxide bleaching and increased yield of brined cherries, but this was accompanied by loss of texture of the finished product.

Effect of .gamma. radiation of polysaccharides and calcium distribution in carrot cell walls

“…The randomized portions were placed in cellophane bags which were closed in such a manner as to permit gas exchange with a minimum of moisture loss. Irradiation was accomplished with a 6000 Ci60 Co source at ambient temperature (24 ± 2°C ) (Massey et al, 1965). Doses of 100,000 rads (100 Krads) and 1000 Krads were obtained by placing the samples at varying distances from the source over a uniform period of 16 hr.…”

Effect of Calcium on the Texture Profile of Irradiated Carrots, Beets and Potatoes *

“…Irradiation was performed with our 6000 ci 6oCo source of gamma radiation (Massey et al, 1965) in air at room temperature (ca. 20°C).…”

Postharvest Treatment of Fruits

“…This loss of firmness is shown to be associated with the activity of cell wall degrading enzymes, particularly polygalacturonase, although a role has been suggested for cellulose, too ( Figure 7). The softening was attributed to the break down of pectin (Kertész et al, 1964;Massey et al, 1965;Somogyi and Romani, 1964). The degradation of pectin and cellulosic materials resulted in architectural weakening in tissue and damage to the semi-permeability of the cell membranes leading to loss of turgor.…”