A method for the determination of phytol enantiomers in plant-based dairy products was established by gas chromatography-mass spectrometry (GC-MS). The pretreatment process was optimized, and the figures of merit of the proposed method such as linear relationship, precision, spiked recovery, limit of detection (LOD) and limit of quantitation (LOQ) were investigated. Results showed that in the concentration range of 0.0–1.0 μg/mL, the linearity of the method was good (r > 0.999). The LODs of E- and Z-phytanol were 0.03 and 0.04 mg/kg, respectively, and the respective LOQs were 0.09 and 0.10 mg/kg. The recoveries of E- and Z-phytanol in spiked samples were 78.6%–93.5% and 79.5%–94.7%, respectively with relative standard deviations (RSDs) less than 10%. This method is sensitive, accurate and repeatable, and can be used for the determination of phytol enantiomers in plant-based dairy products.

A high performance liquid chromatography (HPLC) method was established for the simultaneous determination of the contents of three fumonisins in infant formula. Under optimized experimental conditions, the fumonisins were quantified by an external standard method. The analytical figures of merit such as linear relationship, recovery, precision, limit of detection and limit of quantitation of the method were examined. The results showed that the linearity of the method was good in a certain concentration range (r > 0.999). The detection limits of fumonisin B1, B2 and B3 were 10, 5, and 5 μg/kg, respectively. The limits of quantitation were 30, 15 and 15 μg/kg, respectively. The average recoveries of the fumonisins were 91.6% –95.7%, 89.5%–94.4% and 88.6%–92.3% at three different spiked levels, respectively, and the relative standard deviations (RSDs) for precision were less than 10%.