lab testing of foods Flashcards
1
Q
food analysis
A
Assesses physical, chemical and microbiological propeties
Legal compliance
2
Q
Reasons for food analysis
A
Government regulations
Mandatory standards - marg has 80% fat
Food safety
3
Q
Properties which are analysed
A
Composition - nutrition
Structure of foods - texual
4
Q
CArb tetsing - IODINE
A
no starch iodine is yellow
strong strach = black
5
Q
carb testing - Benedicts test
A
Stays blue if no strahc
red colour if starch present
6
Q
Proteins test - Kjeldahl
A
digestion, neutralisation and titration
nitrogen released which is measured and protein content calculated
Adv - widely use
Disadv - nitrogen? time
7
Q
Lipids testing Sudan III
A
Reddish organge if lipids present
8
Q
Lipids SIV
A
Reddish orange
dark red SIV added to solution with ethanol to dissolve lipids
