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In this report, diaminopropane is used to elute a lectin from an affinity column. They mention the pH, which is the key to the question. The bound lectin was eluted with 20 mM diaminopropane containing 0.15M NaCl, pH ~11. The diaminopropane is unbuffered, and the high pH weakens the interactions between lectin and carbohydrates.

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