Table 4. Mass spectrometry parameters.

	Positive ion mode	Negative ion mode
Capillary voltage	4 kV	3.4 kV
Sampling cone	35 kV	50 kV
Source temperature	100 °C	100 °C
Desolvation temprature	350 °C	300 °C
Cone gas flow	50 L/h	50 L/h
Desolvation gas flow	600 L/h	700 L/h
Extraction cone	4 V	4 V