Inactivation of microorganisms on granular materials: Reduction of Bacillus amyloliquefaciens endospores on wheat grains in a low pressure plasma circulating fluidized bed reactor

被引：26

作者：

Butscher, Denis ^{[1
]}

Schlup, Tina ^{[2
]}

Roth, Christian ^{[1
]}

Mueller-Fischer, Nadina ^{[3
]}

Gantenbein-Demarchi, Corinne ^{[2
]}

von Rohr, Philipp Rudolf ^{[1
]}

机构：

[1] ETH, Inst Proc Engn, CH-8092 Zurich, Switzerland

[2] Zurich Univ Appl Sci, Inst Food & Beverage Innovat, CH-8820 Wadenswil, Switzerland

[3] Buhler AG, Corp Technol, CH-9240 Uzwil, Switzerland

来源：

JOURNAL OF FOOD ENGINEERING | 2015年 / 159卷

关键词：

Plasma; Sterilization; Inactivation; Circulating fluidized bed; Granular materials; Wheat grains; SPORE-FORMING BACTERIA; GLOW-DISCHARGE PLASMA; ATMOSPHERIC-PRESSURE; SURFACE MODIFICATION; FINE POWDERS; TIO2; FILMS; SUBSTRATE; CONTAMINATION; SURVIVAL; BREAD;

D O I：

10.1016/j.jfoodeng.2015.03.009

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：48 / 56

页数：9

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