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. 2020 Apr 21;12(4):267. doi: 10.3390/toxins12040267

Figure 1.

Figure 1

(A) Positive electrospray ionization (ESI+) full-scan MS spectra of Caribbean ciguatoxin-1 (C-CTX1) laboratory reference material (LRM) (estimated to 123 ng/mL); (A1) zoom of C-CTX1 m/z 1123.6149 [M + H - H2O]+; (A2) zoom of C-CTX1 m/z 1163.6106 [M + Na]+ (rectangles in red represent the theoretical isotope abundance and spacing of C-CTX1). (B) ESI+ targeted MS/MS spectra of C-CTX1 LRM (estimated to 123 ng/mL) selecting C-CTX1 m/z 1123.6200 [M + H - H2O]+ at an average collision energy of 30, 50, and 70 eV.