When developing food products that meet consumers’ desire for good taste, extracts can achieve flavours that plain spices and herbs cannot. Extracts are obtained by distillation and contain the desirable flavour components of spices and herbs, offering more consistent flavours than fresh or dried herbs in some packaged foods.
There are two main categories of extracts: essential oils and oleoresins. Essential oils are distilled or expressed from seeds, fruits, roots, stems, or leaves of plants. They capture the complete aroma as highly concentrated volatile components but may not represent the full flavour of the spice or herb because they lack non-volatile constituents. The average volatile oil content of spices and herbs ranges from as low as 0.4% in basil to as high as 15% in nutmeg; for cinnamon, thyme, and dill, it falls between 1% and 3%. Oleoresins, on the other hand, are viscous, complex mixtures of volatile and non-volatile flavour components derived by extraction. They typically contain essential oils, non-volatile substances, fats, waxes, and pigments, representing the complete spice or herb profile in a concentrated, oil-soluble liquid form and capturing potentially bioactive components of interest to the health and nutrition community.