That is, individual PEG molecules bind to the matrix within a chromatography column at differing affinity depending on their molecular weight.
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where, (De Donder; Progoine & Defay, p. 69; Guggenheim, pp. 37,240), we introduce a concise and historical name for this quantity, the "affinity", symbolized by A, as introduced by Théophile de Donder in 1923.