HPLC chromatograms of standards and purified folates form M. oleifera leaves. (1) 5,6,7,8-Tetrahydrofolic acid (H4 folate); (2) 5-Methyl-5,6,7,8-tetrahydrofolic acid (5-CH3-H4 folate); (3) 10-Formylfolic acid (10-HCO folic acid) and (4) 5-Formyl-5,6,7,8-tetrahydrofolic acid (5-HCO-H4 folate)