Studies on some spices and herbs: Chemical composition, health benefits and functional properties

A comprehensive study was carried out to assess the microbiological, nutritional, biochemical and essential oil characteristics of three Egyptian traditional cultivars seeds, namely, cumin (Cuminum cyminum) and coriander (Coriandum sativum) spices as well as basil whole herb (Ocimum basilicum) collected from different Egyptian export centers as being ready for export. The found values for humidity in dry seeds of cumin (7.4%) and coriander (6.4%), as well as total ash and ash insoluble in acid (in cumin 7.7% and 0.74%, but in coriander 5.3% and 0.55%, respectively), were lower than the maximum limits indicated by the Egyptian Specification Standards (ES) and by International Standards Organization (ISO) for cumin and coriander seeds. Analysis of essential minerals in seed spices and herbs indicated that they were rich in K, Ca, Na, Fe and Zn. The total bacterial count was low content in seeds of cumin and coriander as well as fresh whole basil herb. The microbiological load in all tested seed spices and herbs was found lower than those indicated by the ES and ISO for cumin and coriander seeds. Yields in hydro-distilled essential oils (EOs) were the highest in cumin seeds (3.762%), while both coriander and basil herbs had lower amounts (0.285% and 0.686%, respectively). EOs contents were found higher than the maximum limits for cumin (1.5% - 2.5% on a dry weight basis), but within the limits for coriander (0.1% - 0.5% on a dry weight basis) as indicated by the ES and ISO for cumin and coriander seed oils. Gas chromatography of extracted EOs from seeds of cumin and coriander as well as basil herbs indicated the presence of 41, 35 and 47 compounds, respectively, where cumin aldehyde was the major component in cumin volatiles but was linalool in volatiles of both coriander seeds and basil herbs. EOs of basil herbs grown in Egypt were of the high linalool chemotype which was characterized by high contents of linalool and relatively lower amounts of eugenol. However, the major compounds in the three tested EOs from seeds or herbs grown in Egypt are in accordance with literature reports from different parts of the world. Volatile oil components in EOs of the three tested Egyptian spices and herbs were classified into groups, based on the relative area (%). The proportion of the major and the other main components in EOs from seeds of cumin and coriander cultivars were within the ranges indicated by both the ES and ISO for cumin seed oils (cumin aldehyde between 15% - 46%) and for coriander seed oils (linalool between 65% - 78%). The aim of the present work was to Assessment study certain commonly used Egyptian spices and herbal products for characterizing their physical, biochemical and microbiological properties.