Abstract
Pectin and essential oils (EOs) were simultanuously extracted from pomelo peels by adding citric acid into water used for hydrodistillation of pomelo peels. The effect of citric acid concentrations (0–0.55%) on the chemical composition and yield of EOs and pectin yield were investigated. EO yields and the chemical compostion were not significantly affected by citric acid. EO yields were about 1% fresh weight or 4.6% dry weight at all tested concentrations of citric acid. Total monoterpene hydrocarbon content of essential oils in all treatments was not significantly different and within narrow range of 93–94.71%, in which limonene, a main component of pomelo EOs, fluctuated around 89%. However, pomelo pectin yield increased with citric acid concentration. It varied from 11 to 24% as citric acid concentration rose from 0 to 0.55% (equivalent to pH from 7.3 to 2.1). In short, hydrodistillation using citric acid solution is a feasible processing method that combines two different extraction processes into one.
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