CHARACTERIZATION OF CLOVE OIL WITH A FT-IR ATR SPECTROSCOPIC METHOD
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Abstract
Clove oil possesses excellent antioxidant and antimicrobial properties, while the main components of clove oil are eugenol, acetyleugenol and caryophyllene. Two types (ground and buds) of clove were used in the analysis. The clove essential oil was obtained using a steam distillation and an ultrasonic assisted extraction method. The separation of eugenol from other components was achieved with benzoyl chloride reaction. The analysis of clove oil was with a FT-IR ATR spectroscopic method along with the use of a TLC method using mobile phases, toluene:ethyl acetate (9.3:0.7 v/v), phase A and chloroform:hexane (1:2 v/v), phase B. The UV-Vis spectrum of eugenol was with maximum at 280 nm. The obtained yield was found to be 8.79% and 12.41% for ground clove and 1.36% and 6.75% for clove buds using ultrasonic assisted extraction method, respectively. The characteristic band for the ester group C-O of eugenol acetate was observed at 1765 cm-1. The Rf value for eugenol was 0.66 with phase A, and 0.46 using phase B. The methods were easy to be handled, rapid and can be used in the routine analysis.
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