Each measure was performed in triplicate. According to the ULA1 method the limit of quantification, LoQ, is equal to 3×LoD. As shown in Table 4, LoD values varied from 0.10mgkg−1 (vitamin C) to 0.58mgkg−1 (vitamin B5), while LoQ values ranged from 0.30mgkg−1 (vitamin C) to 1.75mgkg−1 (vitamin B5).