Ultraviolet-C light inactivation of Penicillium expansum on fruit surfaces. (April 2015)

• Record Type: Journal Article
• Authors: Syamaladevi, Roopesh M.; Adhikari, Achyut; Lupien, Shari L.; Dugan, Frank; Bhunia, Kanishka; Dhingra, Amit; Sablani, Shyam S.
• Is Part Of: Food control. Volume 50(2015:Apr.)
• Page Start: 297
• Page End: 303
• Publication Date: 2015-04
• Subjects: Blue mold -- Inactivation kinetics -- Hydrophobicity -- Pathogenicity -- Surface roughness -- Surface energy; Food -- Quality -- Periodicals; Food -- Analysis -- Periodicals; Food handling -- Periodicals; Food industry and trade -- Quality control -- Periodicals; Aliments -- Industrie et commerce -- Qualité -- Contrôle -- Périodiques; Aliments -- Qualité -- Périodiques; Aliments -- Analyse -- Périodiques; Hygiène alimentaire -- Périodiques; Food -- Analysis; Food handling; Food -- Quality; Periodicals; Electronic journals; 664.07
• DOI: 10.1016/j.foodcont.2014.09.006
• Languages: English
• ISSNs: 0956-7135

Abstract

Abstract: Understanding the influence of fruit surface morphology on ultraviolet-C (UV-C 254 nm) inactivation of microorganisms is required for designing effective treatment systems. In this study, we analyzed UV-C inactivation of Penicillium expansum that was inoculated onto the surface of organic fruits. Results show that maximum reductions of 1.8 (apple), 2.4 (cherry), 2.6 (strawberry) and 2.8 (raspberry) log CFU/g were observed after 1.2, 2.1, 3.3, and 3.3 kJ/m 2 of UV-C doses, respectively. The UV doses required to reduce 2 log CFU/g of P. expansum population on apples, cherries, strawberries, and raspberries estimated with the Weibull equation were 1.03, 1.28, 1.39, and 1.61 kJ/m 2, respectively. Findings also show that the hydrophobic nature of raspberries, along with high surface roughness, resulted in a lower inactivation rate of P. expansum . This study shows that UV-C effectively reduces P. expansum populations on fresh fruit surfaces; however, the efficacy of treatment is dependent on fruit surface morphology. Highlights: UV-C light treatment significantly reduced the Penicillium expansum population on fruit surfaces. Fruit surface roughness and hydrophobicity influenced the effectiveness of UV-C on reducing the P. expansum population. UV-C doses to reduce 2 log CFU/g of P. expansum population did not change the color and soluble solid contents of fruits.