Chemical composition of grapefruit oil concentrates

Grapefruit oil concentrates were prepared by vacuum distillation and analyz ed by GC/MS. Twenty-five compounds were identified of which limonene (64-85 %) was the major constituent. The influence of the concentration process on oxygenated compounds was also evaluated. Cold-pressed oil concentrated two -fold, five-fold and ten-fold produced two-, four- and five-fold concentrat ion increases in oxygenated compounds, respectively.