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A method for simultaneous separation and determination of four enantiomeric pairs of β‐blockers in waters by chiral CE has been developed. Off‐line SPE was employed using functionalized ordered mesoporous silica as sorbent. Separation by CE was achieved using a BGE composed by methylated‐β‐CD (1.25% w/v) dissolved in a 50 mM phosphate buffer (pH 2.5) and 30°C, with good chiral resolution for all enantiomers...
In this work, two mesoporous silicas functionalized with C18 groups (SM‐C18 and SBA‐15‐C18) have been synthesized for their evaluation as stationary phases in SPE for the extraction and preconcentration of seven steroid hormones (estrone, estradiol, estriol, ethinyl estradiol, diethylstilbestrol, testosterone, and progesterone ) from milk. The characterization of both materials by diverse techniques...
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