Figure 2.

Arsenic analysis. (a) HPLC-ICP MS chromatograms of standard arsenic solutions (upper figure; arsenic concentrations are 10 ppb); 10 mM DMAs^V incubated with 30 mM GSH in distilled water for 1 h at 0°C (middle figure) or 37°C (lower figure). (b) FAB-MS spectrum of purified DMAs^IIIG. DMAs^V (10 mM) was incubated with 30 mM GSH in distilled water for 1 h at 37°C. After incubation, aliquots of this mixture were spotted onto an HPTLC plate and developed using ethyl acetate:acetic acid:water (3:2:1). Separated DMAs^IIIG was extracted using distilled water and purified. The FAB-MS of purified DMAs^IIIG employed positive-ion mode and showed signals at m/z 412.1 [M+H]⁺, m/z 434.1 [M+Na]⁺ and m/z 450.0 [M+K]⁺. Other signals originating from the glycerol matrix were observed at m/z 369.2 [4 M+H]⁺, m/z 391.2 [4 M+Na]⁺ and m/z 461.3 [5 M+H]⁺.