Fig. 2From: Simultaneous determination of protoporphyrin IX and magnesium protoporphyrin IX in Arabidopsis thaliana and Camellia sinensis using UPLC-MS/MSImprovement for pre-treatment steps of PPIX and Mg-PPIX under different conditions. a, extraction solvents; b, extraction temperatures; c, extraction time; d, extraction way; e and f, impurity removal times; g, concentration wayBack to article page