Hygiene and control
11 important questions on Hygiene and control
Codex Alimentarius definition of cleaning?
Effects of food residues?
- Source of nutrients for micro-organisms
- Physical protection for micro-organisms
- Diminished effect of disinfectants
- Decreased performance
Selection of cleaning compound?
- Mineral salts = +/- soluble, +/- removable, +/- removable after heating = acid
- Protein = - soluble, -- removable, - removable after heating (denaturation) = chlorinated or alkaline
- Fat/oil = - soluble, - removable, - removable after heating (polymerisation) = alkaline
- Carbohydrate = + soluble, + removable, - removable after heating (caramelisation) = alkaline
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Chemical forces in cleaning?
- Water: water soluble compounds
- Alkali: stainless steel, rubber, synthetic materials
- Detergents: water insoluble compounds
- Sequestering agents: keep salts in solution/prevent deposits
- Oxidisers: degrade proteins
- Corrosion protectants
- Protective colloids: set viscosity
Codex Alimentarius definition of food handling?
Codex Alimentarius definition of food hygiene?
Improvement of food safety?
- General principles of food hygiene
- Food-related hygienic requirements
- Hazard Analysis and Critical Control Points (HACCP) system
- ISO, Total Quality Management (TQM), etc.
Microbiological examination of foods for food safety?
- Detection = determine presence of target organism
- Isolation = isolate target organism from matrix
- Identification = determine identity of target organism
- Outcome = presence or absence
Microbiological examination of foods for food safety and food quality?
- Enumeration = determine microbiological counts
- Making decimal dilutions
- Outcome = log CFU/ml or /g
Most Probable Number (MPN) technique?
- 3*1 gram, 3*0.1 gram, 3*0.01 gram
- Score positive results (code)
- Look code up in MPN table
- Outcome = ~CFU/g
Culturing media criteria?
- Selectivity: inhibition of competing flora and growth of target organism
- Specificity: ability to discriminate between target organism and others
- Electivity: optimal colony characteristics
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
