Inactivation kinetics of Alicyclobacillus acidoterrestris in apple juice submitted to ultraviolet radiation. (March 2017)

• Record Type: Journal Article
• Authors: Tremarin, Andréia; Brandão, Teresa R.S.; Silva, Cristina L.M.
• Is Part Of: Food control. Volume 73:Part A(2017:Mar.)
• Page Start: 18
• Page End: 23
• Publication Date: 2017-03
• Subjects: Ultraviolet-C inactivation -- Apple juices -- Alicyclobacillus acidoterrestris; 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.2016.07.008
• Languages: English
• ISSNs: 0956-7135

Abstract

Abstract: Ultraviolet-C radiation (UV-C) is widely used as an alternative strategy to control microorganism in food products. Alicyclobacillus acidoterrestris is a thermo-acidophilic, non-pathogenic and spore-forming bacterium, able to grow at low pH and high temperatures. It is a concern, particularly in apple juice thermal pasteurization, because it is responsible for quality degradation. The main objective of this work was to study the influence of UV-C radiation treatments with seven different intensities (0.34, 0.86, 2.59, 5.59, 8.45, 11.50 and 13.44 W/m 2 ) on A. acidoterrestris inactivation in apple juices. Treatments were carried out in a camera (75 × 70 × 45 cm 3 ) with four germicidal UV lamps with peak emission at 254 nm. Commercial juices were artificially inoculated with bacterium, with initial loads around 10 7 CFU/mL and then exposed to UV-C radiation and the treatment impact on microbial loads was assessed throughout exposure times. The UV transmittance at 254 nm of the juice was 58%. Results showed that the log-survival of A. acidoterrestris decreased linearly with treatment time, for all intensities tested. When the most severe intensity was used, the number of spores decreased drastically (around 5-log reduction) after 8 min of treatment. Overall it can be concluded that UV-C radiation is a promising treatment with a drastic impact on the loads of A. acidoterrestris in apple juices, especially when high intensities are used. Highlights: Assessment of UV-C treatments on Alicyclobacillus acidoterrestris inactivation in apple juices. Study of the influence of UV-C radiation with different intensities. Modelling inactivation kinetics due to the radiation effect. Microbial inactivation followed a first-order kinetics and D-values were estimated. UV-C had a drastic impact on A. acidoterrestris loads in apples juices.