The Nigella sativa seed contains alkaloids nigellicin, nigellidin, quanazoline, tannin, steroid a-spinasterol, campsterol, cholesterol, stigmas 7-en-3-beta-ol, stigmasterol and flavonoids of trigillin quercetin-3-glucoside (1). The seeds contain ﬁxed and essential oils, proteins, alkaloids and saponin. Nigella sativa volatile oil has been shown to contain thymoquinone and many monoterpenes such as p-cymene, and α-pinene.
The oil consisted of six phenyl propanoid compounds, monoterpenoid hydrocarbons, monoterpenoid ketones, nonterpenoid hydrocarbons, monoterpenoid alcohols, and sesquiterpenoid hydrocarbons. The oil is characterized by a large amount of phenyl propanoids. The oil presented high levels of trans-anethole and p-cymene. Other important constituents were limonene and carvone (2). α-Thujene α-Pinene, Sabinene, Pinene, Myrcene , α-Phellandrene , p-Cymene , Limonene ,γ-Terpinene Monoterpenoid hydrocarbons Fenchone , Dihydrocarvone Carvone , Thymoquinone , Monoterpenoid ketones