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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Int J Mass Spectrom. 2019 Jan 4;438:107–114. doi: 10.1016/j.ijms.2019.01.002

Table 1.

Measured accurate masses and elemental compositions of precursor [M + H]+ and fragment ions of curcumin (1) and mono-methoxy-curcumin (2).

Compd Precursor ion

(m/z)		 Fragment ions

(m/z)
[M + H]+ [M + H − 70]+ [M + H − 84]+ [M + H − C6H6O2]+ [M + H − methoxyphenol/phenol]+
(100%)
Curcumin (1) C21H21O6
369.1326
(calc. 369.1333)		 C18H19O4
299.1274
(calc. 299.1278)		 C17H17O4
285.118
(calc. 285.1121)		 C15H15O4
259.0961
(calc. 259.0965)		 C14H13O4
245.0807
(calc. 245.0808)
Mono-methoxy curcumin (2) C20H19O5
339.1222
(calc. 339.1227)		 C17H17O3
269.1168
(calc. 269.1172)		 C16H15O3
255.1012
(calc. 255.1016)		 C14H13O3
229.085
(calc. 229.0859)		 C14H13O4
245.0805
(calc. 245.0808)

Compounds under investigation