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. Author manuscript; available in PMC: 2017 Dec 6.
Published in final edited form as: Peptides. 2008 Oct 21;30(2):297–317. doi: 10.1016/j.peptides.2008.10.009

Figure 10.

Figure 10

(A) MALDI-FT mass spectrum of a tissue extract from a single SG tissue from Homarus americanus analysed using 3-hydroxypicolinic acid (HPA) as a matrix to reduce metastable loss of SO3 from sulfated peptides. The m/z values where peaks corresponding to GDY(SO3)DVPE (not detected) would appear are indicated. (B) MALDI-FT mass spectrum of a SG tissue sample from H. americanus measured in the negative ion mode using DHB as the MALDI matrix. The m/z values where peaks corresponding to GDY(SO3)DVPE (not detected) would appear are indicated. (C) MALDI-FT mass spectrum of a a SG tissue sample from H. americanus measured using DHB as the MALDI matrix and following the addition of aqueous NaCl and KCl to promote the formation of [M+Na]+ and [M+K]+ ions. All spectra were measured using conditions optimized for the detection of m/z 1500.