บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Reduction of postharvest pitting of citrus by changing wax components and their concentrations.

Dou, HuaTing; Ismail, M. A.; Petracek, P. D.;

Proceedings of the Florida State Horticultural Society Year: 1999, publ. 2000 Issue: No. 112 Pages: 159-163 Ref: 14 ref.

2000

บทคัดย่อ

Reduction of postharvest pitting of citrus by changing wax components and their concentrations.

The effects of individual wax components, such as shellac and resin, and commercially available carnauba and shellac waxes on pitting incidence of white Marsh grapefruits and Fallglo tangerines [mandarins] were examined. In additional treatments, single wax components were diluted to 10% of commercial concentrations to increase fruit gas exchange without influencing fruit shine. After wax application, fruits were dried and stored at 21 deg C and 93%RH to develop postharvest pitting. Postharvest peel pitting incidence was significantly reduced when grapefruits were coated with shellac (pitting incidence <2%) or resin (<3%) solutions rather than the commercial shellac waxes (20 to 46%). With the diluted shellac or resin solutions, pitting was also low (<3%). Fruit shine was reduced with diluted shellac and resin solutions compared to treatments with commercial shellac waxes or shellac/resin solutions. There was no difference in fruit shine and weight loss among commercial waxes and resin solution.

 Storage of grapefruits at 7 deg C reduced pitting compared with storage at 21 deg C and carnauba wax reduced pitting to <1%. In Fallglo, pitting incidence was higher than in grapefruit. Resin and shellac solutions reduced pitting significantly compared with shellac waxes (pitting incidence 53% and 33%, respectively, compared with 58-71%). Fallglo fruits treated with surfactant or vegetable oil added to a commercial shellac wax showed less pitting (56% and 43%, respectively) than those treated with commercial waxes. Pitting incidence was however high in fruits coated with shellac or resin solution compared with those coated with commercial carnauba waxes (2.4-21%).