HTM 3090 Chapter Notes - Chapter 14: Quaternary Ammonium Cation, Biofilm, Dangerous Goods

• School: University of Guelph
• Department: Hospitality and Tourism Management
• Course: HTM 3090
• Professor: Simon Day

Document Summary

Cleaning: removing dirt and soil from a surface. Sanitizing: treatment of a clean surface to reduce number of microorganisms to safe levels. Sterilizing: destruction of all microorganisms and spores. Microcolony of bacteria that securely attaches itself to an inert surface. When working with a new food, or when work is interrupted. Heat: hot water; must reach 74 c (165 f) to kill microorganisms. Chemical: chlorine, iodine, quaternary ammonium compounds (quats) Minimum concentration for immersion is 100mg/l, 200mg/l for spray sanitizing. 13-49 c for machine, 45-49 c for manual (ineffective if higher) Should never be mixed with other chemicals. Using too much chlorine can leave an odour on dishes, mix fresh batch daily. Minimum concentration for immersion and spray sanitizing is 12. 5 25. 0mg/l. Time for immersion is 2 minutes, manufacturer"s instructions for spray. Temp of solution should be 24 c, iodine will leave solution at 49 c. Iodine can stain and discolour equipment, especially plastic.