| http://www.w3.org/ns/prov#value | - The disclosed matrix is prepared by reacting an amino acid compound of the formula R???HN???(CH2)x???CH(NH2)???COOH, wherein R is an amino protecting group and x is 2, 3 or 4, with bromoacetic acid in alkaline medium and subsequently, after an intermediate purification step, cleaving off the protecting group and reacting this group with an activated matrix.
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