The dietary supplements were purchased directly from the vendors and, for
the purposes of this Article will be identified as Vendor 1 (V1 )
and Vendor 2 (V2 ). Creatine, cycloCreatine, sodium Creatine
phosphate dibasic tetrahydrate, creatinine, formic acid, HPLC-grade water, and
acetonitrile were obtained from Sigma-Aldrich (St. Louis, MO, U.S.A.). The
Agilent Eclipse Plus C18 RRHD (2.1×50 mm, particle size 1.8 μm)
reversed-phase liquid chromatography (RPLC) column was purchased from Agilent
Technologies (Palo Alto, CA, U.S.A.). The Phenomenex Luna CN column
(30×4.60 mm, particle size 3 μm) was purchased from Phenomenex
(Torrance, CA, U.S.A.). PhosphocycloCreatine was synthesized according to
literature procedure.20 (link)Identity and purity of the compound was confirmed by 1H and
31P NMR (Figures S6 and S7 ).
the purposes of this Article will be identified as Vendor 1 (
and Vendor 2 (
phosphate dibasic tetrahydrate, creatinine, formic acid, HPLC-grade water, and
acetonitrile were obtained from Sigma-Aldrich (St. Louis, MO, U.S.A.). The
Agilent Eclipse Plus C18 RRHD (2.1×50 mm, particle size 1.8 μm)
reversed-phase liquid chromatography (RPLC) column was purchased from Agilent
Technologies (Palo Alto, CA, U.S.A.). The Phenomenex Luna CN column
(30×4.60 mm, particle size 3 μm) was purchased from Phenomenex
(Torrance, CA, U.S.A.). PhosphocycloCreatine was synthesized according to
literature procedure.20 (link)Identity and purity of the compound was confirmed by 1H and
31P NMR (