Steam Distillation Extraction Method
Steam distillation is the process of separating organic compounds or volatile organic compounds (VOCs) from water or water-based process fluids. It is a continuous distillation process particularly useful for removing temperature-sensitive solutes such as natural aromatic compounds.
Steam distillation is a separation technique that harnesses the low boiling point property of immiscible mixtures. It is predominately used to separate temperature-sensitive organic molecules from a non-volatile contaminant. The organic molecule must be immiscible in water.
Garlic Essential Oil
Garlic essential oil is typically prepared using steam distillation, where crushed garlic is steamed with the resultant condensation containing the oil. Garlic oil contains volatile sulfur compounds such as diallyl disulfide, a 60% constituent of the oil. Steam-distilled garlic oil typically has a pungent and disagreeable odor and a brownish-yellow color. Its odor has been attributed to the presence of diallyl disulfide. To produce around 1 gram of pure steam-distilled garlic oil, around 500 grams of garlic is required. Undiluted garlic oil has 900 times the strength of fresh garlic, and 200 times the strength of dehydrated garlic.
Ether can also be used to extract garlic oil. A type of garlic essential oil involves soaking diced or crushed garlic in vegetable oil, but this is not pure garlic oil; rather it is a garlic-infused oil.
Garlic essential oil is used as a nutritional supplement, and is sometimes marketed in the form of capsules, which may be diluted with other ingredients. Some commercial preparations are produced with various levels of dilution, such as a preparation that contains 10% garlic oil. Herbal folklore holds that garlic oil has antifungal and antibiotic properties, but there is no clinical research confirming such effects. It is also sold in health food stores as a digestive aid.
It can also be used as an insecticide, diluted with water and sprayed on plants.
Stabilized garlic flavor blend is a proprietary mixture of dehydrated garlic powder infused with garlic oil, which increases the flavor of the garlic powder.