management, staffing and worker safety Flashcards
explain the difference between cleaning and sanitizing
cleaning - removal of visible particles (tidy)
sanitize - reduces the potential number of harmful microorganisms (killing microbes)
name the 3 basic phases of detergency
- penetration
- suspension
- rinsing agent
define penetration
phases of detergency
get through layers
- cleaning agent must penetrate between the layers of soil and the surface to which it adheres
- wetting reduces surface tension and makes penetration possible
define suspension
phases of detergency
the action of a cleaning agent required to hold the loosened soil in the washing solution so it can be flushed away and not redeposited
what does saponify mean
part of suspension
- means to turn fats into soap by reduction with an alkali
what does sequestering mean
part of suspension
- the isolating of substances such as a chemical iron so it cannot react
explain rinsing agent
phases of detergency
a compound designed to remove and flush away soils and cleaners so they are not redeposited on surfaces being washed
the development of polyphosphate detergents has solved the problem of hard water deposits by binding _ & _
lime and magnesium
solvent cleaners
alkaline-based cleaners used to clean surfaces soiled with grease
acid cleaners
lime buildup and rust are treated with acid cleaners
abrasives
used for touch stains that do not respond to solvents or acids
what are the 2 principles of sanitation?
immediately after cleaning, all food contact surfaces must be sanitized
heat sanitizing:
- objective to expose the clean surface to high heat between ~72 C - 82 C
chemical sanitizing:
- object can either be immersed in a solution or can be sprayed or rinsed with the solution
what are the 3 types of chemical sanitizers
- quaternary ammonia
- chlorine
- iodine
what is the contact time for immersion of chlorine
7 seconds
fastest
what is the contact time for immersion of iodine?
30 seconds