The peaks of THQ from sample solution were identified by comparing their retention times obtained from the peaks with those of standard.
It was observed that there is no any interaction peak of other constituents or excipients detected at retention time of THQ which indicated the suitability of this method for the routine analysis of THQ in marketed formulations (Figure 4).
Samples were injected at different level of dilution and calculated concentration showed good precision.
Amount of THQ obtained in different extracts and formulation are presented in table 5.