TRISODIUM PHOSPHATE AND CETYLPYRIDINIUM CHLORIDE SPRAYING ON CHICKEN SKIN TO REDUCE ATTACHED SALMONELLA-TYPHIMURIUM

Spraying treatments with trisodium phosphate (TSP) and cetylpyridinium chloride (CPC) were evaluated for their effectiveness in reducing Sal monella typhimurium attached to chicken skins. Chicken skins with an a rea of 38.5 cm(2) were cut from the breast areas of pre-chill chicken carcasses, mounted in a plastic holder, and inoculated with S. typhimu rium. The inoculated skins were sprayed with tap water, 10% (wt/vol) T SP, or 0.1% CPC solutions at 10, 35, or 60 degrees C and 206.8, 413.7, 620.5, 827.4, or 1034.2 kPa for 30 s. After spraying, each skin was r insed with tap water, transferred to a plastic bag containing 50 mi bu ffered peptone water, and stomached for 1 min. The stomaching water wa s collected, diluted serially, plated on xylose lysine tergitol 4 (XLT 4) agar and Petrifilm aerobic count plates, and incubated for Is to 24 h at 37 degrees C. The results showed that tap water spraying reduced S. typhimurium by 0.7 to 1.6 log, while the reduction ranges for TSP and CPC spraying treatments were 1.6 to 2.3 and 1.5 to 2.5 log, respec tively. Greater reductions in the numbers of S. typhimurium were obtai ned in TSP spraying treatments in the high pressure range (620.5 to 10 34.2 kPa) and in CPC spraying treatments at 10 degrees C.