Abstract: An improved process for separating and isolating individual polar protic monomer(s) and/or oligomer(s) on the basis of degree of polymerization. A liquid sample containing polar protic monomer(s) and/or oligomer(s) is introduced into a liquid chromatography (LC) column packed with a polar bonded stationary chromatographic phase. The individual polar protic monomer(s) and/or oligomer(s) are separated via a binary mobile phase elution. One or more individual fractions containing the monomer(s) and/or oligomer(s) are eluted. The polar protic monomer(s) and/or oligomer(s) may be proanthocyanidins, hydrolyzable tannins, oligosaccharides, oligonucleotides, peptides, acrylamides, polysorbates, polyketides, poloxamers, polyethylene glycols, polyoxyethylene alcohols or polyvinyl alcohols. The binary mobile phase comprises an A phase consisting essentially of a polar aprotic solvent and a B phase consisting essentially of a polar protic solvent. A process for separating and isolating xanthine(s) (e.g.

Abstract: A process for selectively extracting cocoa procyanidins from an aqueous mixture of cocoa polyphenols, by using a particular sequence of acetate solvents and/or diethyl ether solvents to extract selected desired procyanidin monomers and/or oligomers. The aqueous mixture of cocoa polyphenols is first extracted with n-butyl acetate. The acetate solvents include n-butyl acetate, ethyl acetate and methyl acetate. The diethyl ether solvents include mixtures of methyl acetate and diethyl ether in the following ratios (methyl acetate:diethyl ether): 0:100, 25:75, 75:25 (all v/v).