Erratum to: Anal Bioanal Chem

DOI 10.1007/s00216-016-9594-9

The authors would like to call the reader’s attention to the fact that in the original version of this article unfortunately a reference was wrongly numbered. In the section "Material and methods" the first sentence in the paragraph “On-tissue derivatization with GT” should read: “We optimized the on-tissue derivatization method using GT based on a previous report [6]”.