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Blonanserin an antipsychotic novel drug used for the treatment of schizophrenia has antagonist properties for dopamine D2 and serotonin 5-HT2. On the other hand, it lacks adrenergic-α1, muscarinic M1, and histamine H1 antagonist activities. Clinical studies demonstrated in Japan had shown to be more effective for treating negative as well as positive schizophrenic symptoms. This drug was accepted and approved worldwide in the treatment of schizophrenia. A new HPLC method was developed and validated for the estimation of Impurities of Blonanserin (BNS) to ensure that the methodology meets the requirements of the target analysis application. Active and efficient chromatographic separation was achieved on a Zorbax Bonus RP EP C18 column having a particle size of 5μm, with dimensions of 250mm × 4.6 mm, mobile phase containing pH 2.4 buffer and Organic, with 1.0 ml /min flow rate, column oven temperature at 30oC and the eluent detection at 245 nm. The method shows well-separated impurities, is specific without interference from blank solution with resolution more than 1.2 between any of the impurity, correlation coefficient more than 0.99 showing good linearity; mean recovery ranging from 97% to 105% and is very sensitive at lower detection and quantification limits. This method was well developed and has been applied successfully to monitor and estimate impurities in Blonanserin.
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