“... of this impurities using HPLC was searched. Several chromatography columns were tested and the composition of mobile...”
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“... of separation of zolpidem tartrate and its impurity A. There was tested the influence of the composition...”
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“... composition of mobile phase was studied. With increasing temperature the retention of analytes has decreased...”
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“... of the composition of the mobile phases with different ratios of the organic and aqueous components. The effect...”
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“... on column, concentration of ammonium acetate, composition of the mobile phase with changing levels...”
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“.... The mobile phases also contained different compositions of the organic component. In addition, different...”
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