Spectrophotometric Estimation of Linalool in ...

Spectrophotometric Estimation of Linalool in Coriander Seeds

Author Name : K K Padmanabha, Mallamma, K Madhusudhana Reddy, N Linganna

Coriander is a spice due to presence of linalool, an essential oil which is a major component of coriandrol present in coriander. It is extracted from finely powdered dry coriander seeds by steam distillation. The yield is 0.15 to 0.2%. It is a pale yellow liquid with characteristic smell of coriander. It is a mixture of terpenes and terpenoids¹. Linalool is the major component present up to 70%.

The procedure for the estimation of tertiary alcohol² is employed with small modification by using HBr instead of HI in the present estimation. The method is based on the conversion of linalool into its bromide with HBr and thus formed bromide is oxidized quantitatively with potassium bromate to bromine. Bromine is extracted with cyclohexane and the λ_max is determined. Absorbance of bromine of different concentrations is measured and standard graph is plotted. Then it is verified by using standard linalool solution and then the amount of linalool in coriandrol is estimated.