Evaluation of the Petrifilm Rapid Coliform Count Plate Method for Coliform Enumeration from Surimi-Based Imitation Crab Slurry

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The 3M Petrifilm rapid coliform count (RCC) plate method was compared with two conventional methods, namely violet red bile agar (VRBA) and desoxycholate lactose agar (DLA), for enumerating coliforms. The VRBA plating method is a reference method in the Bacteriological Analytical Manual and the DLA plating method is the method recommended by the Food Sanitation Law of Korea for enumeration of coliforms. Serratia sp., a coliform that was isolated from frozen surimi, was incubated in surimi-based imitation crab (SBIC) slurries and enumerated on the Petrifilm RCC, VRBA, and DLA plates. Results from the Petrifilm RCC plate were not significantly different from results from VRBA or DLA plates at P < 0.05 level. The correlation coefficient for Petrifilm RCC plates versus the VRBA method and for Petrifilm RCC plates versus the DLA method were 0.994 and 0.996, respectively. With the Petrifilm RCC plate method, we were able to estimate presumptive coliforms (except Serratia sp.) after 14 h and to enumerate confirmed coliforms (including Serratia sp.) after 24 h.

Document Type: Short Communication

Affiliations: 1: Department of Biological Resources and Technology, Yonsei University, Wonju, Kangwon, 220-710, Republic of Korea 2: Korea Institute of Food Hygiene, Noryangjin, Seoul, 156-050, Republic of Korea 3: 3M Korea Ltd., Yoido, P.O. Box 93, Seoul, 150-600, Republic of Korea

Publication date: January 1, 2000

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