Suppression effects of carbonate on the interaction between stainless steel and phosphate groups of phosphate compounds in high-performance liquid chromatography and electrospray ionization mass spectrometry.
We examined the suppression methodology of the interaction between phosphate compounds, such as nucleotides, and the stainless steel surfaces of high-performance liquid chromatography and electrospray ionization mass spectrometry (HPLC/ESI-MS) equipment in an effort to prevent the tailing of peaks seen in HPLC chromatograms of phosphate compounds. Addition of carbonate (CO(3)(2-)) to mobile phase was highly effective in suppressing the interaction of phosphate compounds derived from a complexation between phosphate groups and metal ions that exist on a stainless steel surface in a mechanism similar to Fe(III)- and Cr(III)-immobilized metal affinity chromatography (IMAC). Addition of ammonium hydrogen carbonate to mobile phase achieved a simple and reliable HPLC/ESI-MS analysis of mono-, di-, and triphosphate compounds (six nucleotides) without peak tailing due to the interaction between stainless steel surfaces and phosphate groups. Moreover, ammonium hydrogen carbonate buffer, a volatile buffer with good buffering capacity at neutral pH, does not compromise the stability of silica-based HPLC columns, decreases in sensitivity, ion source pollution, clogging of the ESI interface, and/or ion suppression in HPLC/ESI-MS.
Asakawa
Yoshiki
Y
Sunplanet Co., Ltd., 2 Kawashimatakehaya, Kakamigahara, Gifu 501-6024, Japan. y-asakawa-sun@hhc.eisai.co.jp
Tokida
Noriaki
N
Ozawa
Chinami
C
Ishiba
Masahiko
M
Tagaya
Osamu
O
Asakawa
Naoki
N
D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D009711:Nucleotides / Q000737:chemistry; D010755:Organophosphates / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013193:Stainless Steel / Q000737:chemistry*; D053719:Tandem Mass Spectrometry
D009711:Nucleotides; D010755:Organophosphates; D010710:Phosphates; D013193:Stainless Steel