(m/z) of the (GGG-K(N3)-FR-SLLMWITQ(Abu)) peptide before and after PEGylation was analyzed on Bruker Microflex LRF MALDI-TOF equipment. Samples were analyzed within a concentration range of 0.3–0.5 mg·mL-1 in ACN:ddH2O (1:1 v/v), using 1 µL of matrix-sample-matrix sown on the MALDI plate. Matrix: Sinapic acid (trans-3,5-dimethoxy-4-hydroxycinnamic acid) (D7927, Sigma Aldrich) at 10 mg·mL-1 in ACN:ddH2O (1:1 v/v) + 0.1% TFA.
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