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A sensitive LC-MS/MS method has been developed and validated for the quantitative determination of Dexlansoprazole from the commercially available formulations. Omeprazole was used as the internal standard. Isocratic separation was achieved using Zorbax SB C 18 column (4.6 × 100 mm, 3 µm) as a stationary phase and the mobile phase consists of (0.5 mM) Ammonium Acetate adjusted to pH 3.5: acetonitrile (30:70 V/V) with a flow of 0.5 mL/min. Detection was carried out by triple quadrupole mass spectrometry with electrospray ionization in positive mode with proton adducts at m/z 370.05 to 251.95 and 346.00 to 198.05 to monitor Dexlansoprazole and Omeprazole. The linearity of the method was found over a concentration range of 0.5-3000 ng/mL with a regression analysis of 0.9994. The percentage recovery of the present method was found to be 94.33 to 99.97%. The LC-MS/MS method was validated as per ICH guidelines. The developed method can be successfully applied for the estimation of Dexlansoprazole in the commercial formulation and in bulk drug.

Soluble epoxide hydrolase (sEH) inhibition is reported to elevate endogenous epoxyeicosatrienoic acids (EET's), which are known to play an important role in neuroprotection by inhibiting oxidative stress and neuroinflammation. In the present study, PTUPB, a dual inhibitor of sEH and COX-2, has been tested for its antiparkinson activity against rotenone (ROT) induced neurodegeneration in Drosophila model of Parkinson's disease (PD). To determine the efficacy and brain bioavailability of PTUPB a simple, rapid and sensitive LC-MS/MS method was developed and validated for the estimation of PTUPB (Method-I), dopamine (DA) and its metabolites (Method-II) in fly head. Mass spectrometric acquisitions of analytes signals were performed in positive and negative electron spray ionization MRM mode by monitoring the daughter ions. The isocratic elution using formic acid (0.1% v/v) and acetonitrile (20:80v/v) (for method I), and acetic acid (0.1% v/v) and methanol (for method II) on Jones C was carried out to achieve the separation. The results of brain PTUPB, DA and its metabolites estimation shows a dose dependent increase in PTUPB concentration and a dose dependent prevention of ROT induced changes in DA and its metabolites levels (p<0.05), indicating a significant neuroprotection activity of PTUPB. In the present study, we have successfully developed and validated LC-MS/MS methods to identify and quantify PTUPB, DA and its metabolites using a UFLC-ESI-QqQ mass spectrometer for the screening of neuroprotective agents in Drosophila Melanogaster.