Theoretical mass of P-Coumaric acid is 164.16, in LCMS analysis it observed 146.9 why this is so? & same issue with other phenolics, Please Answer.?

In HPLC -MS analysis, observed mass and theoretical mass of phenolics such as P-coumaric acid did not match. Observed mass is less by 18 then theoretical value. what will be the possible...

07 July 2019 901 11 View