ERP Sulfite Methods-Meeting Materials_4-2020
ERP for Sulfites in Seafood Methods Materials
46
Table 16. Factorial design and results of robustness testing TREATMENT COMBINATION RAW SHRIMP HEAD OFF WITH 50-100 PPM SULFITE 1 2 3 4 5
6
7
8
9
16 mL 16 mL 16 mL 16 mL 20 mL 20 mL 20 mL 20 mL 18 mL 10 sec 10 sec 30 sec 30 sec 10 sec 10 sec 30 sec 30 sec 20 sec
EXTRACTION VOLUME ULTRATURRAX TIME
EXTRACT STORAGE BEFORE ANALYSIS
none 4 h at 25°C
none 4 h at 25°C
none 4 h at 25°C
none 4 h at 25°C
2 h at 25°C
100 114 101
116 84 110 82
102 88
98 96
111 102
BIOFISH RESULTS (mg/kg)
99
115 102
95
92
Table 17. Youden factorial design F Factor Value of F Factor
DETERMINATION COMBINATION
1
2
3
4
5
6
7
8
9
A: 16 ml a: 20 ml a´: 18 ml B: 10 sec b: 30 sec b´: 20 sec C: none c: 2 hours c´: 4 hours
Extraction volume
A A A A a
a
a
a
a´
Ultraturrax time
B
B b
b
B B b
b b´
Extract storage before analysis
C c´
C c´
C c´
C c´
c
Result (average data) (mg/kg) % of Nominal (Combination 9)
99.5 114.5 101.5 113 83 98.5 90 97 106.5
93.4 107.5 95.3 106.1 77.9 92.5 84.5 91.1 NA
Table 18. Youden test results
Variables comparison (X-x)
Average differences (D i )
SD of the differences (SD i )
SD of the method (raw shrimp head off, 106 mg/kg)
Acceptance criterion Compliance*
Δ A, a Δ A, a´ Δ a, a´ Δ B, b Δ B, b´ Δ b, b´
no no no no no no no
15.00
7.50 3.31 7.19 5.66 5.81 4.69 6.50
6.63
14.38 11.31 11.63
2.8
SD i ≤ SD
9.38
Δ C, c
13.00
30
04/16/2020
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