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. 2014 Nov 6;15(11):20339–20354. doi: 10.3390/ijms151120339

Figure 1.

Figure 1

1H-NMR and mass spectra of Ch2-PEGn. (A) 1H-NMR spectra (400 MHz) of Ch2-PEGn in CDCl3; (a,b) 6- and 3-position protons in Chol; (c) protons of methylene in PEG and (d) methylene proton of succinyl group. The principal proton peaks of Chol-suc and PEG were found in Ch2-PEGn; (B) Mass spectra of Ch2-PEGn. The m/z ions of Ch2-PEG600 and Ch2-PEG1000 are singly charged molecular-related ions; the m/z ions of Ch2-PEG2000 are doubly charged molecular-related ions. The measured molecular weight of Ch2-PEG600, Ch2-PEG1000 and Ch2-PEG2000 were 1544, 1895 and 3012 Da, respectively.