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	Effect of shear rate and oxygen stresses on the survival of Lactococcus lactis during the atomization and drying stages of spray drying: A laboratory and pilot scale study
	Ghandi, Amir ; Powell, Ian B. ; Howes, Tony ; Chen, Xiao Dong ; Chen XD(陈晓东) ; Adhikari, Benu
	2012-11
关键词	Atomization Spray drying Survival Shear rate Oxygen injury Lactococcus
英文摘要	The effect of shear rate and oxygen injury during atomization and the combination of these factors on the survival of Lactococcus lactis subsp. cremoris in spray drying was studied using laboratory and pilot scale spray dryers. The atomization was carried out using a two-fluid nozzle in the laboratory study and a two-fluid nozzle or rotary atomizer in the pilot scale study. The extent of oxygen-induced death was determined using ascorbic acid in the feed and atomizing the feed with gaseous nitrogen. The lowest levels of bacterial death were observed at lowest characteristic shear rate and in the presence of nitrogen and ascorbic acid. Quantitative analysis showed that lower shear rate, creating an oxygen-limiting environment during atomization and drying, and using oxygen scavengers in the feed were successful in enhancing bacterial survival in spray drying. We also report for the first time that, at least for L lactis, the extent of death during the atomization stage far outweighs death during the drying stage, and that the majority of bacterial death (up to 93%) occurs during the atomization stage. The death of bacteria was found to be less when using a rotary atomizer or when using a two-fluid nozzle atomizer at lower flow rate. This work shows that bacterial death during spray drying can be minimized by using oxygen scavengers such as ascorbic acid and/or an anaerobic atomizing medium (such as nitrogen), and by altering the spraying conditions. (c) 2012 Elsevier Ltd. All rights reserved.; Dairy Innovation Australia [08210C]; IDP Education Australia
语种	英语
出版者	ELSEVIER SCI LTD
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1016/j.jfoodeng.2012.06.005]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Ghandi, Amir,Powell, Ian B.,Howes, Tony,et al. Effect of shear rate and oxygen stresses on the survival of Lactococcus lactis during the atomization and drying stages of spray drying: A laboratory and pilot scale study[J],2012.
APA	Ghandi, Amir,Powell, Ian B.,Howes, Tony,Chen, Xiao Dong,陈晓东,&Adhikari, Benu.(2012).Effect of shear rate and oxygen stresses on the survival of Lactococcus lactis during the atomization and drying stages of spray drying: A laboratory and pilot scale study..
MLA	Ghandi, Amir,et al."Effect of shear rate and oxygen stresses on the survival of Lactococcus lactis during the atomization and drying stages of spray drying: A laboratory and pilot scale study".(2012).

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