Invertase (Sucrase) - Enzyme for Sugar Hydrolysis - CAS 9001-57-4 / Articles

Invertase (Sucrase) in the Food Industry

Invertase (CAS 9001-57-4), also known as sucrase or beta-fructofuranosidase (EC 3.2.1.26), is a glycoside hydrolase enzyme that catalyzes the hydrolysis of sucrose (table sugar) into an equimolar mixture of glucose and fructose, known as invert sugar or invert syrup. This liquid enzyme preparation is widely used in the food industry, particularly in confectionery, baking, and beverage production, to improve taste, texture, and product stability.

Chemical Nature and Properties

Invertase is a protein enzyme, typically derived from baker's yeast (Saccharomyces cerevisiae) or other microbial sources. As a biological catalyst, it does not have a fixed molecular formula like a small molecule. The enzyme is supplied as a concentrated liquid, ranging from light yellow to brownish in color, with a mild, yeast-like odor. Key properties include:

Appearance: Clear to slightly turbid liquid, light yellow to brownish
Density: Approximately 1.10–1.20 g/cm³ (depending on concentration)
Optimal pH: 4.5–5.5 (active range: pH 3.0–8.0)
Optimal Temperature: 45–55°C (active range: 20–60°C)
Activity: Typically 25,000–300,000 U/g (one unit hydrolyzes 1.0 µmole of sucrose per minute at pH 4.5 and 55°C)
Solubility: Completely soluble in water; inactive in organic solvents
Storage: Recommended at +2 to +8°C to maintain activity; stable at pH 4–6

Mechanism of Action

Invertase catalyzes the cleavage of the glycosidic bond in sucrose, producing an equimolar mixture of glucose and fructose. This reaction is known as inversion, and the resulting syrup is called invert syrup. The enzyme works by binding to the sucrose molecule and facilitating the addition of a water molecule across the glycosidic bond, releasing the two monosaccharides. Unlike acid hydrolysis, which can produce colored by‑products and off‑flavors, enzymatic hydrolysis with invertase yields a colorless product with a clean taste.

Applications in the Food Industry

Confectionery: Invertase is widely used in the production of soft‑centered sweets, such as after‑dinner mints, chocolate‑filled confections, and fondants. The enzyme is added to the sugar center, where it gradually hydrolyzes sucrose into glucose and fructose over several days or weeks. This conversion produces a liquid, non‑crystallizing center with a smooth texture and enhanced sweetness. The enzyme also prevents sugar crystallization, ensuring a stable, high‑quality product.

Baking: Invertase is used in baked goods to improve texture, moisture retention, and shelf life. The production of invert syrup helps maintain softness and prevents staling.

Beverages: Invertase is employed in the production of beverages to create invert syrup, which is sweeter than sucrose and less prone to crystallization. It is also used to reduce sugar content in fruit and vegetable processing.

Other Applications: Invertase is used in the manufacture of artificial honey, as well as in the production of fructooligosaccharides (FOS) – prebiotic compounds valued for their intestinal health benefits. It is also used in the extraction and analysis of sugars and starch.

Safety and Regulatory Status

Invertase is generally recognized as safe (GRAS) for use in food processing. It is approved for use in the United States by the FDA and in the European Union as a food enzyme. The enzyme is non‑toxic and does not produce harmful by‑products. However, individuals with known yeast allergies should exercise caution, as the enzyme is typically derived from Saccharomyces cerevisiae.

Storage and Handling

Invertase should be stored in tightly sealed containers at 2–8°C to maintain enzyme activity. It is stable at pH 4–6 and should be protected from extreme temperatures, strong acids, and strong bases, which may cause denaturation. The enzyme has a shelf life of typically 24 months under recommended storage conditions. Use appropriate personal protective equipment (gloves, safety goggles) when handling concentrated enzyme solutions.

Conclusion

Invertase (sucrase, CAS 9001-57-4) is an essential enzyme in the food industry, particularly in confectionery production. Its ability to hydrolyze sucrose into glucose and fructose enables the production of invert syrup, which is sweeter, less prone to crystallization, and improves the texture and stability of a wide range of food products. With its favorable safety profile and proven efficacy, invertase remains a key tool for food manufacturers seeking to enhance product quality and extend shelf life.