unknown

[shripad007.pharma]

hiii dear all.I am using API 2000 LC-MS/MS System for Impurity profiling purpose. While using this,it was found that in mass spectra a molecular ion (M+H+38) larger than parent compound (M) always. What is that ?? Pleazzzzzz guide me also suggest to avoid that >>peaks

[tom jupille]

Potassium adduct ?

Try increasing the declustering voltage.