Page 368 - Analytical method for food addtives

248 Analytical methods for food additives

Table 26.3 Performance characteristics for saccharin in sweetener tablets 1
Sample Saccharin–cyclamate tablets
Analyte Saccharin
No. of laboratories 7
Units mg/100 g
Mean value 5.80
S 0.51
r
RSD 2.59 %
r
r 0.42
S 0.30
R
RSD 5.23 %
R
R 0.85
Identified in interlaboratory test conducted by the Max von Pettenkofer Institute, Germany.
Key
Mean The observed mean. The mean obtained from the collaborative trial data.
r Repeatability (within laboratory variation). The value below which the absolute difference
between two single test results obtained with the same method on identical test material under
the same conditions may be expected to lie with 95 % probability.
S r The standard deviation of the repeatability.
RSD r The relative standard deviation of the repeatability (S × 100/mean).
r
R Reproducibility (between-lab variation). The value below which the absolute difference
between two single test results obtained with the same method on the identical test material
under different conditions may be expected to lie with 95 % probability.
S R The standard deviation of the reproducibility.
RSD R The relative standard deviation of the reproducibility (S × 100/mean).
R
Horrat The HORRAT value for reproducibility is the observed RSD value divided by the RSD value
R
R
calculated from the Horwitz equation.