2 results about "Precolumn derivatization" patented technology

The application discloses an analysis method of tobramycin sulfate injection and application thereof, and the analysis method comprises the following steps: performing a pre-column derivatization reaction on a sample containing tobramycin and impurities by using a derivatization reagent, and then performing high performance liquid chromatography analysis on the sample after derivatization. The analysis is performed by gradient elution of a mobile phase A and a mobile phase B composed of water, acetonitrile and phosphoric acid, wherein the content of acetonitrile in the mobile phase B is higher than that in the mobile phase A, and effective separation of tobramycin and related impurities is realized by multi-stage gradient elution. The method can simultaneously separate and detect process impurities, degradation impurities and unknown impurities, has good separation degree and stability indicating capacity, and is suitable for quality control and drug stability research of tobramycin sulfate injection.

The invention discloses a method for detecting the content of chloroacetaldehyde in dimethylaminoacetaldehyde diethyl acetal, which comprises the following steps: carrying out precolumn derivatization on chloroacetaldehyde by using a derivatization reagent, and carrying out isocratic or gradient elution by using a reversed-phase high-performance liquid chromatography and an acetonitrile-phosphoric acid aqueous solution as a mobile phase. The method realizes accurate quantification of chloroacetaldehyde in dimethylaminoacetaldehyde diethyl acetal, is high in detection speed, low in cost and simple to operate, has good specificity, sensitivity, precision and accuracy, is an effective quality control method for dimethylaminoacetaldehyde diethyl acetal, and has wide application prospects. And the product quality of afatinib maleate bulk drugs and related preparations synthesized by using dimethylaminoacetaldehyde diethyl acetal as a starting material is further ensured.