Garlic (Allium sativum) is a bulbous perennial of the Allium genus, related to onion, leek, and shallot, cultivated worldwide as a culinary spice and valued for its bioactive constituents. The bulb is divided into cloves whose intact cells store the odorless precursor alliin; when tissue is crushed or cut, the enzym…
Garlic (Allium sativum) is a bulbous perennial of the Allium genus, related to onion, leek, and shallot, cultivated worldwide as a culinary spice and valued for its bioactive constituents. The bulb is divided into cloves whose intact cells store the odorless precursor alliin; when tissue is crushed or cut, the enzyme alliinase converts alliin to allicin, a reactive organosulfur compound responsible for garlic's pungency and much of its biological activity. Allicin is unstable and decomposes into further organosulfur species such as diallyl sulfides and ajoene, and its yield depends strongly on preparation, with extraction method and processing markedly affecting allicin content and antioxidant capacity. These sulfur compounds, together with flavonoids, phenolics, and essential minerals, underlie investigations of garlic as a functional food with antioxidant, antimicrobial, and cardiometabolic properties, and place it among plant materials studied for activity against bacteria and fungi and for dietary roles in conditions such as colorectal disease. As an agricultural crop, garlic is subject to soil and foliar nutrient management and to diseases including purple blotch and tip-burn that influence yield and quality. Characterization of its physicochemical and mineral composition, alongside the chemistry of allicin formation and stability, links garlic's culinary use to food science, agronomy, and the study of nutritionally and pharmacologically relevant plant compounds across the wider context of edible spices.
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