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Pilot scale application of ozonated water wash - effect on microbiological and sensory quality parameters of processed iceberg lettuce during self-life

Särkkä-Tirkkonen, M.; Leskinen, M. and Ölmez, H. (2008) Pilot scale application of ozonated water wash - effect on microbiological and sensory quality parameters of processed iceberg lettuce during self-life. In: Cultivating the future based on science : volume 2 livestock, socio-economy and cross disciplinary research in organic agriculture, International Society of Organic Agriculture Research, pp. 772-775.

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Summary

The aim of the study was to assess the effect of ozonated water wash on the microbiological and sensory quality parameters of minimally processed iceberg lettuce in pilot scale in comparison to aqueous chlorine wash. Alternative solutions for chlorine are needed, since its use is prohibited in organic food processing. Iceberg lettuce samples were washed with three different ozone solutions and the water wash and the 100 ppm chlorine wash were used as control. Ozone generator based on corona discharge was used to produce ozone at level 7 ppm. The samples (150 g) packed in oriented polypropylene pouches were stored for 10 days at +5C and the microbiological and sensory quality was analysed on days 1, 6 and 10. There was no significant difference between chlorine wash samples and the samples washed 1 min in a machine with ozonated water concerning the microbiological quality. Compared with the chlorine with lower concentrations of ozone it is possible to control the microbial load. Concerning the sensory quality all samples endured all of the treatments well except the treatment with 7 ppm ozone for 5 min. As a conclusion the bubbling gaseous ozone in water can be as effective disinfection method as chlorine wash when the following processing parameters are taken into account: concentration of ozone during the whole process, exposure time, water temperature and the amount and type of the organic material.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:ozone, iceberg lettuce, fresh-cut-vegetables, minimal processing
Subjects: Food systems > Processing, packaging and transportation
Research affiliation: Turkey
Finland > Univ. Helsinki > Rural Research
Deposited By: Koistinen, Riitta
ID Code:13897
Deposited On:07 Aug 2008
Last Modified:12 Apr 2010 07:37
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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