Food Matrix Spike Level (mg/kg) Recovery (%) Intra-Day Recovery (%) Inter-Day RSDr (%) RSDr (%) Intra-Day Inter-Day Sugar 10 n 3 9 1.39 1.61 Mean% 81.24 81.69 SDr 0.113 0.132 50 n 3 9 3.17 1.51 Mean% 85.09 85.71 SDr 1.35 0.649 100 n 3 9 1.61 1.19 Mean% 83.73 84.81 SDr 0.641 1.015 Jam 10 n 3 9 1 2.79 Mean% 81.49 82.59 SDr 0.081 0.23 50 n 3 9 1.59 0.74 Mean% 83.41 84.83 SDr 0.663 0.313 100 n 3 9 1.37 1.18 Mean% 81.62 83.04 SDr 1.119 0.98 Ready to Serve Beverage 10 n 3 9 1.51 1.71 Mean% 82.33 82.85 SDr 0.124 0.141 50 n 3 9 2.19 1.52 Mean% 91.74 90.71 SDr 1.004 0.689 100 n 3 9 1.53 1.76 Mean% 90.58 91.29 SDr 1.389 1.606 Beverage Concentrate 10 n 3 9 1 1.08 Mean% 85.62 84.31 SDr 0.084 0.091 50 n 3 9 2.53 3.09 Mean% 88.88 90.78 SDr 1.122 1.404 100 n 3 9 1.62 1.67 Mean% 91.28 94.53 SDr 1.476 1.582 350 n 3 9 0.45 0.86 Mean% 98 98.45 SDr 1.537 2.969 Biscuit 10 n 3 9 5.98 3.42 Mean% 66.15 65.06 SDr 0.395 0.223 50 n 3 9 2.86 1.18 Mean% 72.06 71.88 SDr 1.029 0.425 100 n 3 9 3.02 4.78   Mean% 72.49 70.69   SDr 2.189 3.376 Raisins 10 n 3 9 1.07 1.12 Mean% 82.21 81.87 SDr 0.088 0.095 50 n 3 9 2 4.28 Mean% 84.72 86.92 SDr 0.939 1.862 100 n 3 9 1.21 1.42 Mean% 85.01 85.58 SDr 1.031 1.212 500 n 3 9 0.392 0.81 Mean% 87.21 87.88 SDr 1.707 3.554 750 n 3 9 1.5 1.61 Mean% 88.15 87.99 SDr 9.917 10.559 Fruit Bar 10 n 3 9 0.53 0.7 Mean% 80.94 80.08 SDr 0.043 0.057 50 n 3 9 1.88 3.24 Mean% 84.21 84.11 SDr 0.791 1.361 100 n 3 9 3.02 1.4 Mean% 84.04 83.36 SDr 2.538 1.171 Potato Chips 10 n 3 9 2.39 2.34 Mean% 70.2 70.73 SDr 0.167 0.167 50 n 3 9 4.13 4.66 Mean% 72.83 73.27 SDr 1.504 1.705 100 n 3 9 2.66 2.54 Mean% 74.98 76.81 SDr 1.997 2.924

Table 2: Repeatability of different food matrices. n=number of samples; SDr=Repeatability Standard deviation; %RSDr=% Repeatability Relative standard deviation.