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To develop a kind of control realease preparation for Metoprolol Tartrate,mesoporous silica particles were chose for the purpose.Briefly,MCM-41 type nanospheres with a size of 100-200 nm were synthesized through the reaction of tetraethyl orthosilicate(TEOS)in the water medium at 353 K,with introducing some cetyltrimethyl ammonium bromide(CTAB)as porogens.