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Monodisperse uniform zirconium-titanium mixed oxide microspheres (approximately 3 microm) with different zirconium/titanium ratios are easily synthesized (using Zr(acac)(4) and Ti(OBu)(4) as precursors) by a sol-gel method and have been characterized for their enrichment of phosphopeptides from standard protein alpha-casein.
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Yan et al. (2009) studied this question.
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