Sugar: A Sweet Carbohydrate
Sugar is a general term for sweet-tasting, soluble carbohydrates, many of which are used in food. Scientifically, it refers to the simplest carbohydrates: monosaccharides and disaccharides.
Chemical & Structural Overview
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Table Sugar (Sucrose): The refined white crystalline substance most commonly known as “sugar” is sucrose.
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Formula: $C_{12}H_{22}O_{11}$
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Structure: Sucrose is a disaccharide (double sugar) composed of one molecule of glucose and one molecule of fructose chemically bonded together.
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Simple Sugars (Monosaccharides): These are the building blocks, including:
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Glucose: The body’s primary and most readily used form of energy.
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Fructose: Found naturally in fruit and honey (fruit sugar).
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Galactose: A component of lactose (milk sugar).
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Source and Production
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Commercially, the vast majority of refined sugar (sucrose) is extracted from two main plant sources:
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Sugarcane: A giant grass grown in tropical and subtropical regions.
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Sugar Beet: A root crop grown in temperate regions.
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Function in Food & Diet
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Sweetener: The primary function, used globally to enhance the flavor of beverages and food.
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Energy Source: Sugar is a form of carbohydrate, providing 16 kJ (4 calories) of energy per gram. The body breaks it down into glucose for cellular energy.
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Culinary Role: In baking and cooking, it also provides bulk, texture, and color (through caramelization and the Maillard reaction) and acts as a preservative.
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