The method consists in inoculation of Petri dishes with a specified test sample, further inoculation, under the same conditions, using decimal dilutions of the test sample. then aerobic incubation of the plates at 35 °C or 37 °C for 20 h, followed by calculation, from the number black colonies appearing on the plates, of the number of characteristic colonies and subjection of the colonies to confirmation procedures and calculation of the number of micro-organisms per millilitre or per gram of sample.
Số hiệu tiêu chuẩn
ISO 7937
Tên tiêu chuẩn
Microbiology; General guidance for enumeration of Clostridium perfringens; Colony count technique
Ngày phát hành
1985-07-00
Tiêu chuẩn tương đương
BS 5763-9 (1986-02-28), IDT * NF V08-019 (1985-12-01), IDT * NP-2261, IDT * SFS-ISO 7937 (1987), IDT
Từ khóa
Bacteria count methods * Clostridium * Colony count techniques * Detection * Food products * Microbiological analysis * Microbiology * Microorganisms