Methods

Limit of detection

Reference

HPLC-UV (derivatization with difluoroborane)

Absolute amount of 0.040 ng

[6]

Capillary zone electrophoresis- diode array detector

Not described absolute amount;

0.034 μg/mL as concentration

[7]

HPLC-UV (no derivatization, i.e. direct injection)

Absolute amount of 1 ng (at 240 nm);

0.005 μg/mL as concentration

Absolute amount of 2 ng (at 345 nm);

0.01 μg/mL as concentration

[8]

HPLC-UV (derivatization with NBD-F)

Absolute amount of 0.33 ng;

0.05 μg/mL as concentration

[9]

HPLC-VIS (derivatization with Dabsyl-Cl)

Absolute amount of 0.26 ng;

0.18 μg/mL as concentration

This paper