N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
8.13 Spectra of Solvents and References
443
2,5-Dihydroxybenzoic acid (M r 154.1)
Dithranol (M r 226.2)
Ferulic acid (4-hydroxy-4-methoxycinnamic acid; M r 194.2)
Sinapinic acid (3,5-dimethoxy-4-hydroxycinnamic acid; M r 224.2)
8.13.4 References
[1] R. Orlando, Analysis of peptides contaminated with alkali-metal salts by fast
atom bombardment mass spectrometry using crown ethers, Anal. Chem. 1992,
64, 332.
[2] P.K. Singh, L. Field, B.J. Sweetman, Organic disulfides and related substances,
J. Org. Chem. 1988, 53, 2608.
[3] Z.-H. Huang, B.-J. Shyong, D.A. Gage, K.R. Noon, J. Allison, N-Alkylnicotinium halides: A class of cationic matrix additives for enhancing the sensitivity in negative ion fast-atom bombardment mass spectrometry of polyanionic
analytes, J. Am. Soc. Mass Spectrom. 1994, 5, 935.
[4] A.E. Ashcroft, Ionization Methods in Organic Mass Spectrometry, The Royal
Society of Chemistry: Cambridge, 1997.
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
153
110
99
330
416
308
HO
OH
COOH
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
225
240
387
193
465
688
OH OH OH
OH
OH
O
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
193
582
387
COOH
HO
O
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
223
188
447
COOH
HO
O
O