Title: Characterization of microbial growth on processing equipment by electrochemical impedance spectroscopy Author
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: May 26, 2013
Publication Date: N/A
Technical Abstract: Microbial activity that leads to the formation of biofilms on process equipment can accelerate corrosion, reduce heat transfer rates, and generally decrease process efficiencies. Additional concerns arise in the food and pharma industries where product quality and safety are a high priority. Following good manufacturing practices with a program of preventive maintenance can minimize these impacts. Pharmaceutical production with sterilized water lowers the risk of microbial growth and contamination. Within the food industry the cost would be prohibitive. In poultry processing, for example, bird carcasses are directly contacted by process water which becomes contaminated and remains on the wetted surfaces of the equipment. Immersion chilling is practiced in the United States to rapidly cool bird carcasses to inhibit bacterial growth. The chiller water is inoculated by microbes that are not easily removed by washing and adhere to the skin of the bird, particulates, and equipment surfaces . The use of disinfectant chemicals is allowed, however, the concentration in the process water is reduced by salt formation and precipitation . Microbial growth and biofilm formation was investigated in the presence of the disinfectant trisodium phosphate and hard water ions. Microbial growth was followed by optical density (OD) measurements and biofilm formation was characterized with electrochemical impedance spectroscopy (EIS).