“…To the best of our knowledge, few analytical methods have been proposed for determination of REM and FAV such as liquid chromatography [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , electrochemical techniques [23] , [24] , [25] , and spectrofluorimetric methods [14] , [26] , [27] . It is worth noting that most of published methods suffer from using expensive analytical instruments and hazardous chemicals, time consuming, and need well-trained personnel.…”