Fig. 5

Precursor ion and daughter ion of glutamate and α-ketoglutarate standards and the samples. In the measurement, the ion reaction was set to m/z = 147.5–148.5 and m/z = 144.5–145.5, respectively; a, b, c are the peak time, precursor ion and daugther ion of standard glutamate, respectively; d, e, f are the peak time, precursor ion and daughter ion of glutamate detected in the sample, respectively; g, h, i are the peak time, precursor ion and daugther ion of standard α-ketoglutarate, respectively; j, k, l are the peak time, precursor ion and daugther ion of α-ketoglutarate detected in the sample