Visualizing the spatial distribution of metabolites in Clausena lansium (Lour.) skeels using matrix-assisted laser desorption / ionization mass spectrometry imaging Author Tang, Xuemei * & Institute of Quality Standard and Monitoring Technology for Agro-products of Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China & * & Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality (Guangzhou), Ministry of Agriculture and Rural Affairs, China Author Zhao, Meiyan Author Chen, Zhiting Author Huang, Jianxiang Author Chen, Yan Author Wang, Fuhua Author Wan, Kai text Phytochemistry 2021 112930 2021-12-31 192 1 7 http://dx.doi.org/10.1016/j.phytochem.2021.112930 journal article 264234 10.1016/j.phytochem.2021.112930 049b94ba-ba44-4a57-ae93-d861f2a8a5b7 1873-3700 8257146

Table 1 Identification of metabolites in Clausena lansium (Lour.) Skeels by MALDI-MS analysis in positive ion mode.

Compound name	Ion formula	m/z	Fragment ion	Ref.
Alkaloids
a Confirmed by standard substance. b The mass fragments used to infer the chemical identities of the various compounds are based on published literature provided for each of the alkaloids in the supplementary information. c Hypothesis.
DL-Stachydrine a	[C H NO +K]+ 7 13 2	182.06	100.11
	[C H N O –CO +H]+ 14 26 2 4 2	243.21	100.11, 144.10
	[C H N O +K]+ 14 26 2 4	325.15	182.06, 144.10, 100.11
3-Methylcarbazole b	[C H N H]+ 13 11 +	182.10	95.05, 167.07, 116.97, 105.05	(Cui et al., 2002)
Murrayanine b	[C H NO H]+ 14 11 2+	226.09	198.09,183.07,167.07,155.07	(Sripisut et al., 2012)
Heptaphylline b	[C H NO H]+ 17 17 +	252.14	234.13, 133.09, 91.05	(Songsiang et al., 2011)
5-methyl-2-vinyl-3,11-dihydropyrano carbazole c	[C H NO H]+ 18 15 +	262.12	205.10, 234.13, 91.05
Girinimbine a	[C H NO + H]+ 18 17	264.14	131.05, 103.05, 205.10,
Murrastinine b	[C H NO +H]+ 18 17 2	280.13	174.09, 205.10, 262.12	(Liu et al., 2019)
Unknown	[C H NO +K]+ 30 37 11	626.20	103.05, 131.05, 264.14, 500.16, 524.16
Unknown	[C H NO K]+ 28 40 15+	668.19	103.05, 131.05, 264.14, 282.15
Coumarin
8-Hydroxylpsoralen	[C H O H]+ 11 6 4+	203.03	147.04,175.04, 131.05	(Huang et al., 2017)
Wampetin b	[C H O H]+ 21 18 6+	367.12	203.03, 147.04, 131.05, 165.09	(Liu et al., 2014)
2′,3′-Epoxyindicolactone b	[C H O +H]+ 21 18 7	383.11	203.03, 163.08, 181.09	(Lakshmi et al., 1984)
Anisolactone b	[C H O +K]+ 21 18 6	405.07	–	(Liu et al., 2014)
Dihydroindicolactone b	[C H O K]+ 21 20 6+	407.09	203.03, 147.04, 167.11, 369.13	(Liu et al., 2014)
Wampetin dimer c	[C H O K]+ 42 36 12 +	771.18	405.07
Other metabolites
Sucrose	[C H O K]+ 12 22 11+	381.08	219.03, 201.02
Hexose	[C H O +K]+ 6 12 6	219.03	–
Citric acid	[C H O +K]+ 6 8 7	231.00	–
4-Methylmethamphetamine	[C H N + H]+ 11 17	164.14	–