COMPARATIVE IMPEDANCE EVALUATION OF THE MICROBIAL LOAD OF DIFFERENT FOODSTUFFS

被引：7

作者：

BOLLIGER, S ^{[1
]}

CASELLA, M ^{[1
]}

TEUBER, M ^{[1
]}

机构：

[1] CPC EUROPE,QUAL ASSURANCE,DEPT MICROBIOL,CH-8240 THAYNGEN,SWITZERLAND

来源：

FOOD SCIENCE AND TECHNOLOGY-LEBENSMITTEL-WISSENSCHAFT & TECHNOLOGIE | 1994年 / 27卷 / 02期

关键词：

D O I：

10.1006/fstl.1994.1035

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

The traditional microbial colony counts (total viable counts = TVC, Enterobacteriaceae count) are compared with the results obtained with two commercially available impedance systems (Bactometer 128 and Malthus 2000). Samples, in part artificially contaminated, were a selection of dehydrated raw materials and finished products, including leeks, meats, mushrooms, onions and spices as ra w materials, and fresh salads, dry soups and bouillons as finished products. The investigated impedance systems revealed detection limits at a cell concentration of 3 x 10(7) CFU/mL. A microbial load of 10(6) colony forming units in leeks for example, is detected within 5 h in the Bactometer, and about 6 h in the Malthus 2000 system, respectively. At low microbial loads of 10(2) colony forming counts per g, the corresponding detection times were between 12 and 14 hours. Compared to the traditional colony count, this provides a time gain of al least 2 days, if the analysis is done overnight. Inhibitory effects observed with spices, onions and leeks could partially be eliminated by adding 1 g/L lecithin and 3 g/L Tween 80 to the diluting solvent. The selectivity of the Enterobacteriaceae medium used in the Bactometer could be improved by using a double concentrated medium with an addition of 50 mg/L monensin.

引用

页码：177 / 184

页数：8