highly significantp<0.0001
The quadratic model for GABA yield ( Y , mM) was highly significant (F=39.65, p<0.0001, R 2 =96.59 %), with significant terms for MSG (p=0.0338), sucrose (p=0.0284), their interaction (p=0.0319), and quadratic terms for both MSG (p<0.0001) and sucrose (p<0.0001) ( Table 4 and Table 5 ).