Inactivation kinetics of Alicyclobacillus acidoterrestris in apple juice submitted to ultraviolet radiation

被引:59
作者
Tremarin, Andreia [1 ]
Brandao, Teresa R. S. [1 ]
Silva, Cristina L. M. [1 ]
机构
[1] Univ Catolica Portuguesa, Ctr Reg Porto, Escola Super Biotecnol, CBQF, Rua Arquiteto Lobao Vital,Apartado 2511, P-4202401 Porto, Portugal
关键词
Ultraviolet-C inactivation; Apple juices; Alicyclobacillus acidoterrestris; UV-C LIGHT; MICROBIAL INACTIVATION; SPORES; MICROORGANISMS; IRRADIATION; TEMPERATURE; RESISTANCE; STABILITY; PRODUCTS; DESIGN;
D O I
10.1016/j.foodcont.2016.07.008
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
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 x 70 x 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. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:18 / 23
页数:6
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