For HPLC/UV there was a good precision over the tested LA concentration range. Thus, intra- and inter-day precision ranged between 3% and 8%, respectively. The accuracy was satisfactory. The sensitivity was poor due to the absence of a chromophore. Fig. 2C shows chromatograms for standard solutions of LA performed by HPLC/UV. To increase the sensitivity, derivatization has been used,which however requires several steps to obtain fluorescence