The validated HPLC and UPLC methods were applied to different
fruit juices and vitamin supplements. The content of vitamin C in
tested products is reported in Table 3. DHAA was not present in
any sample (the results obtained for samples prepared with and
without DTT were not statistically different). The results obtained
using HPLC and UPLC methods were very similar although, for
some products, the results obtained using UPLC were slightly
higher than those obtained by HPLC. It may be due to the higher
sensitivity of UPLC than HPLC