Volatile Constituents of Black Pepper. III. The Monoterpene Hydrocarbon Fraction

SUMMARY The monoterpene hydrocarbons of black pepper oil were isolated both by vacuum distillation and by thin‐layer chromatography. The following compounds were separated by gas chromatography and identified by infrared and ultraviolet spectroscopy: α‐pinene, β‐pinene, sabinene, β‐carene, limonene, and p‐cymene. There is evidence for the presence of a‐thujene, α‐phellandrene, myrcene, β‐phellandrene, y‐ter‐pinene, and terpinolene. The monoterpenes isolated by thin‐layer chromatography also contained small quantities of α‐terpinene and greater quantities of γ‐terpinene, p‐cymene, and terpinolene.