3.2. Free amino acids
The content of total free amino acids in fresh button mushroom
was 44.2 mg/g dry weight, as shown in Table 2, which was comparable
with that in Agaricus bisporus (48.8–64.2 mg/g dry weight)
(Tsai et al., 2007). The total free amino acids gradually increased
to 48.9 mg/g dry weight during the sublimation period in FD process
(FD 1 h, FD 3 h, and FD 5 h), and then remarkably (p < 0.05)
decreased to 24.3 and 42.0 mg/g dry weight during FD and FMVD,
respectively.