We acquired the 13 C CP NMR data to detect potential structural changes in the heated and unheated samples of formulations F6 and F7 based on the acquired spectra (Figure ). Similar to the observations we made for NMR spectra for the samples of BSA described in the previous section no significant chemical shift changes were evident from the data when comparing the effect of heating or the addition of 0.04% w/v polysorbate.