Handbook of Culture Media for Food and Water Microbiology
All Purpose Tween (APT) agar – modified (for H2O2 detection)
Published:06 Dec 2011
Special Collection: 2011 ebook collection , 2011 ebook collection , 2011-2015 food science subject collection
2011. "All Purpose Tween (APT) agar – modified (for H2O2 detection)", Handbook of Culture Media for Food and Water Microbiology, Janet E L Corry, Gordon D W Curtis, R M Baird
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This monograph has been reviewed by members of the IUMS–ICFMH Working Party on Culture Media and given ‘Proposed’ status.
This medium was devised by Evans and Niven (1951) and a modification developed by Shipp (1964) for the rapid non-selective enumeration of bacteria capable of elaborating H2O2 during growth under aerobic conditions. Such a reaction on cooked cured meats results in a “green” discoloration. This principle was also used by Whittenbury (1964) and Reuter (1970).
Double layer plates are prepared.
Bottom layer: APT agar (15 mL).
Top layer: 20 g of MnO2 are added to 200 mL APT broth, dispensed in 10 mL amounts and sterilised by autoclaving at 121°C for 15 min. To each 100 mL amount of sterile, cooled (45°C) APT agar is added 10 mL of MnO2 suspension. When the bottom layer is firmly set, a thin layer of APT agar with MnO2 is added.