ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest quality of GA-treated Florida grapefruit after gamma irradiation with TBZ and storage

W. R. Miller and R. E. McDonald

Postharvest Biology and Technology Vol: 7 Issue: 3 Pages: 253-260.

1996

บทคัดย่อ

Grapefruit, Citrus paradisi (Macf.), harvested from gibberellic acid (GA) treated trees were irradiated at 0.3 or 0.6 kGy, and evaluated for quality after treatment and simulated commercial storage. The peel of GA-treated fruit retained green color and the fruit were firmer than control fruit after treatment. A condition, not observed before with grapefruit, was described and termed `spongy fruit', which increased as irradiation dosage increased. The incidence of fruit peel pitting after five weeks' storage increased from <2% to 11% and 25% as irradiation dose increased from 0 to 0.3 and 0.6 kGy. The majority of pitting at 0.3 kGy was slight and would not have an affect on U.S. #1 Grade for grapefruit. Incidence of decay (mostly green mold) was reduced with thiabendazole (TBZ), and mean decay among all treatments was <1%. Total soluble solids, titratable acidity and the resulting ratio was not affected by GA or irradiation. There was a general decline in the sensory preference for juice flavor, and pulp flavor and texture as irradiation dose increased. We conclude that GA-treated grapefruit will tolerate irradiation dosage of 0.3 kGy without serious damage; however, at dosage of 0.6 kGy, serious peel damage detrimental to fruit quality will likely develop during storage.