AOAC OMA# 2015.10 Methods Review (January 23, 2019)
FOR EXPERT REVIEW PANEL USE ONLY NOT FOR DISTRIBUTION
Analytical Range:
LOQ:
Accuracy/Recovery:
Precision (RSD r ): Reproducibility (RSD R ):
Design of MLT: The study was conducted on ten test materials, one of which was NIST SRM 1849a. After qualification, each participating laboratory analyzed a blind duplicate of each sample for both the free and total portions of each nutrient on each of two days. A total of 9 laboratories produced reportable results.
Choline
SMPR range
2 – 250 mg/100g
RSD r
2 – 20 mg/100g: 20 – 200 mg/100g: 2 – 20 mg/100g: 20 – 200 mg/100g:
<10% < 5% <15% <10%
RSD R
Results for SRM p14 of 2015.10(Carn-07)_MLT_Report_01-2019.pdf
Total Choline Certified Mass Fraction:
1090 ± 110
mg/kg
Table 1.6 Individual laboratory values, mg/100g Corresponding CMF:
98 - 120
mg/100g
A
B
C
D
E
F
G
H
I
107 105
107 106
114 113
105 104
98.1 95.4
105 102
106 103
113 112
100
99
Overall average (Table 1.8): 105 mg/100g; RSD r = 1.3%; RSD R 5.1%;
A total of 18 values were used (no outliers); • 17 of the 18 values fell within the CMF.
Total Choline Table 1.8 • 10 of 10 samples produced results in the SMPR range;
3 samples were in the lower SMPR range of 2 – 20 mg/100g RSD r ranged from 1.5 – 2.7% • The requirement of RSD r < 10% was thus met; RSD R ranged from 7.2 – 7.5% • The requirement of RSD R < 15% was thus met.
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