Contamination of pear concentrate by Alicyclobacillus from recirculating flume water during fruit concentrate production

Steyn C.E. ; Cameron M. ; Brittin G. ; Witthuhn R.C. (2011)

Article in Press

Alicyclobacillus and viable aerobic counts were monitored at nine different production stages of pear concentrate, with the functioning of either a recirculating or a one-pass flume water system. Significantly (P < 0.05) higher levels of Alicyclobacillus were detected in the final pasteurized product (102-104°C for 90 s) when the recirculating flume water system was operational. An average of 1.19 Log10 c.f.u. ml-1 vegetative cells and 1.35 Log10 c.f.u. ml-1 endospores were recovered, whereas 0 c.f.u. ml-1 vegetative cells and endospores were detected when the one-pass flume water system was operational. Alicyclobacillus levels did not differ significantly (P > 0.05) in condensate water during the functioning of the two flume water systems, with 1.81 Log10 c.f.u. ml-1 vegetative cells and 1.01 Log10 c.f.u. ml-1 endospores (recirculating system) and 0.78 Log10 c.f.u. ml-1 vegetative cells and 0.42 Log10 c.f.u. ml-1 endospores (one-pass system) recovered, respectively. As a result, water treatment protocols should be established if untreated recirculating flume or condensate water is to be used in order to prevent Alicyclobacillus contamination and accumulation in the processing environment. © 2011 Springer Science+Business Media B.V.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/13171
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