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INFORMATION SHEET
Number 12/01
February 2001
Food Standards Agency UK - SURVEY OF
3-MONOCHLOROPROPANE-1,2-DIOL (3-MCPD) IN SELECTED FOOD GROUPS - Annex 2
Food Surveillance Information Sheet
Number 12/01
ANALYTICAL QUALITY ASSURANCE
The following quality assurance criteria were set:
- Reagent blanks should not show a 3-MCPD response
equivalent to or greater than 0.05 mg/kg.
- The values for the cross matrix reference material
should fall within 0.025 mg/kg plus or minus 0.006 the value determined by
in-house homogeneity testing.
- The values for the salami reference material should fall
within 0.022 mg/kg plus or minus 0.002 the value determined by in-house
homogeneity testing.
- The values for the cheese alternative reference material
should fall within 0.028 mg/kg plus or minus 0.004 the value determined by
in-house homogeneity testing.
- The values for the breadcrumbs alternative reference
material should fall within 0.030 mg/kg plus or minus 0.004 the value
determined by inter-laboratory collaborative trial.
- The values for the soup reference material should fall
within 0.035 mg/kg plus or minus 0.003 the value determined by in-house
homogeneity testing.
- The values for the aqueous reference material should
fall within 0.010 mg/kg plus or minus 0.003 the value determined by in-house
homogeneity testing.
Results exceeding 2 standard deviations but lower than 3
standard deviations were regarded as having reached the warning level. In this
instance the rules governing Shewart control charts were adopted. Where the
quality control criteria were not adequately met the analytical batch was
repeated.
The results show that the analyses met the quality criteria set such
that:
- None of the reagent blank samples contained 3-MCPD at or
above 0.005 mg/kg.
- All determinations of 3-MCPD in the soy sauce reference
material fell within plus or minus 2 s.d. of the homogeneity tested
mean.
- All determinations of 3-MCPD in the cheese alternative
class reference material fell within plus or minus 2 s.d. of the homogeneity
tested mean.
- · One determination for of 3-MCPD in the cheese
bread reference material gave a value outside the warning limit (i.e. greater
than 2 s.d.) of the control chart but subsequent values for the reference
material were within the required limits. This was in compliance with the rules
governing Shewhart control charts and the batch was accepted.
- One determination for of 3-MCPD in the salami class
reference material gave a value outside the warning limit (i.e. greater than 2
s.d.) of the control chart but subsequent values for the reference material
were within the required limits. This was in compliance with the rules
governing Shewhart control charts and the batch was accepted. fell within plus
or minus 2 s.d. of the homogeneity tested mean.
- All determinations of 3-MCPD in the soup class reference
material fell within plus or minus 2 s.d. of the homogeneity mean.
- All determinations of 3-MCPD in the aqueous reference
material fell within plus or minus 2 s.d. of the homogeneity mean.
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These pages were last updated on 31
January 2001.
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