TABLE 2 

External calibration results of the SCFA analysis

Namem/z (derivatized)RT (min)Calibration functionCoefficient of
determination (R2)
Method
Propionic acid2,411,3414.0y = 1.2119x − 0.57840.9990UV
Butyric acid2,551,4974.6y = 59,940x + 16,9560.9981MS
Isovaleric acid2,691,6545.3y = 82,730x + 6,202.90.9993MS
Valeric acid2,691,6545.5y = 92,248x + 4,8830.9998MS