Title: Inactivation of microorganisms on granular materials : reduction of Bacillus amyloliquefaciens endospores on wheat grains in a low pressure plasma circulating fluidized bed reactor
Authors : Butscher, Denis
Schlup, Tina
Roth, Christian
Müller-Fischer, Nadina
Gantenbein-Demarchi, Corinne
von Rohr, Philipp Rudolf
Published in : Journal of Food Engineering
Volume(Issue) : 159
Pages : 48
Pages to: 56
Publisher / Ed. Institution : Elsevier
Issue Date: Aug-2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Not specified
Language : English
Subjects : Inactivation; Bacillus amyloliquefaciens endospores; Wheat grain; Low pressure plasma
Subject (DDC) : 664: Food technology
Abstract: Cereal grains can contain high bacterial loads so that a microbial reduction step is desired. Therefore, a low pressure circulating fluidized bed reactor for the treatment of granular materials was constructed, and an argon/oxygen plasma was ignited in the riser tube by an inductively coupled RF-source. With this setup, the viability of Bacillus amyloliquefaciens endospores, artificially deposited on wheat grains, could be reduced by over two logarithmic units within 30 s of effective treatment time. In addition, the influence of plasma power input and variation in oxygen gas admixture was studied. Based on energy influx measurements and the solution of the heat equation, a thermal inactivation effect and the thermal degradation of wheat grains could be excluded. No negative effects of plasma treatment on wheat grain properties were detected in flour and dough analyses.
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Food and Beverage Innovation (ILGI)
Publication type: Article in scientific Journal
DOI : 10.1016/j.jfoodeng.2015.03.009
ISSN: 0260-8774
URI: https://digitalcollection.zhaw.ch/handle/11475/6517
Appears in Collections:Publikationen Life Sciences und Facility Management

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