Derivatization of Levoglucosan for Compound-Specific δ¹³C Analysis by Gas Chromatography/Combustion/Isotope Ratio Mass Spectrometry

Figure 3

GC/MS chromatogram of levoglucosan derivatized by MBA + MSTFA (a) and the corresponding mass spectra of (b) compound 1 (LM), (c)compound 2 (LMT), (d) unknown by-product compound 3, and (e) compound 4 (LT), together with the proposed fragmentation patterns for 1 (inset in b) and 2 (inset in c), under optimal derivatization conditions: 70°C; 60 min for MBA; and 120 min for MSTFA derivatization, respectively; levoglucosan : MBA : MSTFA = 1 : 1 : 120; MSTFA : pyridine (v : v) = 1 : 3.

(a)

(b)

(c)

(d)

(e)