Mass spectra obtained with MALDI-TOF MS in positive reflectron mode for the (A) ACNSFE and (B) ACSFE fractions. “r.int.” and “DP”
correspond to relative intensity and degree of polymerization, respectively. (Inset) Enlarged spectrum to assist with visualizing the isotopic
distribution of potassium adducts of proanthocyanidin (PAC) tetramers