ملخص البحث :

ABSTRACT : A clear, sensitiveas well as quick spectrophotometric process is defined in various mouth washes samples to investigate the microgram amounts of thymol. In the existence of potassium ferricyanide (K3Fe(CN)6) and sodium hydroxide, the process is depended on the oxidative coupling reaction between orthotolidene (OTD) to for man extreme pink substance with 544nm strongly absorption. Beer’s law is provided on the concentration scale between 0.5–16ppm with 1.3608 × 104 l.mol-1.cm- 1 as molar absorptivity as well as 0.011μg.cm-2 as Sandal’s sensitivity. The limit of detection was 0.198ppm. The optimal conditions for the color production are defined additionally utilizing the proposed method for determining thymolin bulk drug and Pharmaceutical preparations (Various Mouth Washes Samples) has been successfully applied. This approach was not interfered with by the usual excipients and additives.