Figure 2.

Comparison of GSL concentrations in the freeze-dried sample powder (coordinate axis in black), the frozen-fresh sample powder (coordinate axis in blue) and the microwave-based homogenized sample (coordinate axis in green) of Chinese cabbage, baby Chinese cabbage, pak choi, daikon radish (1.5 cm and 3 cm cubes) and broccoli (floret and quarterly floret) samples: (a) three methods, (b) freeze-dried sample powder and frozen-fresh sample powder and (c) freeze-dried sample powder and microwave-based homogenized sample. The red line represents the equivalence of x, y and z, while the pink shade represents that the relative standard deviation of x and y is within 20%.