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The grafting reaction was restricted to the microparticle surface by selecting a polar monomer (N\u2010vinylformamide) and a non\u2011swelling reaction solvent (ethanol), preventing monomer penetration into the polymer matrix. The resulting stationary phase exhibited typical HILIC retention behavior and provided effective separation of polar model analytes, including nucleosides, amino acids, and vitamins, with a plate count of up to 41\u00a0980 plates per meter for cytosine. The phase demonstrated excellent hydrolytic stability across a wide pH range (2\u201310) and extremely low column bleed. 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