Objective: The main aim of the present work is to synthesize chloramphenicol impurity A (CLRMIMP-
A) in the purest form and its subsequent characterization by using a panel of sophisticated analytical
techniques (LC-MS, DSC, TGA, NMR, FTIR, HPLC, and CHNS) to provide as a reference standard
mentioned in most of the international compendiums, including IP, BP, USP, and EP. The present synthetic
procedure has not been disclosed anywhere in the prior art.
Methods: A simple, cheaper, and new synthesis method was described for the preparation of CLRM-IMP-A. It
was synthesized and characterized by FTIR, DSC, TGA, NMR (1H and 13C), LC-MS, CHNS, and HPLC.
Results: CLRM-IMP-A present in drugs and dosage form can alter the therapeutic effects and adverse reaction
of a drug considerably, it is mandatory to have a precise method for the estimation of impurities to safeguard
the public health. Under these circumstances, the presence of CLRM-IMP-A in chloramphenicol (CLRM)
requires strict quality control to satisfy the specified regulatory limit. The synthetic impurity obtained was in
the pure form to provide a certified reference standard or working standard to stakeholders with defined
Conclusion: The present research describes a novel technique for the synthesis of pharmacopoeial impurity,
which can help in checking/controlling the quality of the CLRM in the international markets.