CARBOHYDRASE AND CELLULASE FROM ASPERGILLUS NIGER
Carbohydrase and cellulase from Aspergillus niger is a microbial enzyme preparation that serves as a processing aid in specific food manufacturing applications, including removal of visceral mass in shellfish processing and aiding shell removal, under conditions described in US food additive regulations.
What It Is
Carbohydrase and cellulase from Aspergillus niger is a processing aid enzyme preparation derived from the nonpathogenic fungus Aspergillus niger. It comprises a mixture of carbohydrase and cellulase enzymes that catalyze the breakdown of complex carbohydrates by hydrolyzing specific glycosidic linkages. As a processing aid, it is used to facilitate mechanical and biochemical processing steps in food production rather than to directly contribute nutrition or sensory attributes to the final product. In regulatory terms, this ingredient is specifically listed in the United States Code of Federal Regulations at 21 CFR 173.120 as a permitted enzyme preparation for defined uses in food production. Under this regulation, the organism Aspergillus niger itself must be absent from the finished enzyme preparation product, and the strains used must be nonpathogenic and nontoxic. The enzyme preparation may be added during processing but is typically present only in minimal residual amounts in the final food when used correctly under good manufacturing practices. The CAS Number 977050-27-3 uniquely identifies this specific enzyme preparation under regulatory and inventory systems. Though it does not correspond to a single small molecule in chemical structure databases, the CAS is recognized in several regulatory inventories. Its primary classification is as an enzyme processing aid, distinct from flavoring agents, nutrients, or preservatives.
How It Is Made
Carbohydrase and cellulase enzyme preparations are typically produced by fermenting the fungus Aspergillus niger under controlled conditions. During this fermentation, the fungus secretes a suite of carbohydrase and cellulase enzymes into the growth medium. After the fermentation period, the culture broth is processed to remove the fungal cells entirely, leaving behind a clarified enzyme preparation. This removal step is mandated in regulatory text to ensure that no viable production organism remains in the final food processing aid. The resulting enzyme preparation may undergo further purification, concentration, and stabilization to achieve a product suitable for food processing uses. Although specifics can vary between manufacturers, typical food-grade enzyme preparations are formulated to meet established identity and purity specifications and to be free of contaminants that could present safety hazards or impact food quality.
Why It Is Used In Food
Carbohydrase and cellulase from Aspergillus niger is used in food production because these enzymes catalyze the breakdown of carbohydrate structures in food matrices, which can aid processing efficiency. For example, the carbohydrase and cellulase activities assist in the removal of visceral mass and shells in shellfish processing by loosening connective carbohydrate-rich tissues. These enzymatic actions improve processing yield, uniformity, and consistency of the edible components extracted from shellfish. In broader enzyme applications, carbohydrase and cellulase preparations are selected because they target specific carbohydrate linkages in plant cell walls or connective tissues, making them useful where mechanical separation of food components would otherwise be difficult or inefficient. Their function is technological: enhancing processing steps without imparting significant nutritional or sensory changes to finished foods.
Adi Example Calculation
Because enzyme processing aids like carbohydrase and cellulase from Aspergillus niger are used at minimal levels during food manufacturing, and typical regulatory evaluations conclude that an ADI is not specified when there is no identifiable hazard at intended use levels, a specific numerical ADI calculation is not applicable for this ingredient. In regulatory practice, an ADI “not specified” means that normal dietary exposure resulting from correct use of the enzyme preparation is considered negligible and not of safety concern. (化学信息网) This narrative serves to explain that, unlike direct additives present at defined levels in foods, the contribution of processing aids to the diet is typically insignificant once foods have been processed and any functional enzyme activity has been inactivated or removed.
Safety And Health Research
Safety and health research on enzyme preparations like carbohydrase and cellulase derived from Aspergillus niger focuses on ensuring that the production organism is nonpathogenic and non-toxigenic, that the enzyme preparation is free of viable fungal cells, and that any residual protein does not present allergenic or toxic effects at the levels present during or after processing. Regulatory evaluations consider toxicological studies on similar enzyme preparations as well as biochemical characterization of the enzymes themselves. (eCFR) Studies and risk assessments by food authorities, including FSANZ and EFSA, have examined cellulase enzyme preparations from A. niger and concluded that the enzyme does not present safety concerns when used as intended. For example, an assessment indicated that under conditions of intended use in brewing and distilled alcohol production, cellulase does not pose hazards that would preclude its use as a processing aid, and there is no evidence of genotoxicity or other adverse effects at technologically relevant exposure levels. (EFSA Online Library) Allergenicity and immunogenic potential are also considered in safety evaluations, with particular attention to whether residual enzyme proteins remain in finished foods and whether they could trigger reactions in sensitive individuals. In general, processing aids such as enzymes are applied in amounts that result in negligible residual protein in the final food.
Regulatory Status Worldwide
In the United States, carbohydrase and cellulase enzyme preparations derived from Aspergillus niger are specifically regulated under 21 CFR 173.120 as secondary direct food additives permitted in food for human consumption when used in accordance with prescribed conditions. This regulation outlines permitted uses in shellfish processing and requires that the producing organism is removed and that only nonpathogenic, nontoxic strains are used. The enzyme preparation is also recognized in the FDA Food Substances Added to Food (formerly EAFUS) inventory under its CAS number, indicating that it is permitted for use under FDA regulations and enumerated in ingredient inventories. (FDA HFP App External) Outside the United States, regulatory evaluations of similar cellulase/carbohydrase enzyme preparations are conducted by food safety authorities such as Food Standards Australia New Zealand (FSANZ) and the European Food Safety Authority (EFSA). For instance, FSANZ has assessed applications for cellulase from A. niger as a processing aid in brewing and distilled alcohol production and concluded that this class of enzymes can be permitted when safety, identity, and purity specifications are met, and there is no identifiable hazard at intended use levels. At the international level, enzyme preparations from A. niger have also been the subject of safety evaluations by scientific panels that consider toxicological and allergenicity data, often concluding that when produced under controlled conditions and used as processing aids, these preparations do not raise safety concerns under intended conditions of use.
Taste And Functional Properties
Carbohydrase and cellulase enzyme preparations are functionally neutral in terms of taste and flavor in the quantities typically used as processing aids. Because they act on carbohydrate structures rather than contributing distinct flavor compounds, these enzymes do not impart tastes such as sweetness, bitterness, or umami to the final foods. Their primary functional property is to hydrolyze specific carbohydrate linkages, such as those in cell walls or connective tissues, facilitating physical separation processes or biochemical transformations during food manufacture. These enzyme preparations are proteins and, like other enzymes, are sensitive to heat and pH conditions that lead to denaturation. As such, their activity is typically greatest under specific processing conditions optimized for temperature and pH. Once the intended biochemical effect is achieved, the enzymes may be inactivated by subsequent processing steps, such as cooking or heat treatment, rendering them inactive in the finished product.
Acceptable Daily Intake Explained
Acceptable Daily Intake (ADI) is a regulatory concept that represents the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For many enzyme processing aids, including carbohydrase and cellulase from Aspergillus niger, regulatory evaluations may conclude that an ADI is “not specified” or equivalent when available data indicate that the enzyme preparation does not present safety concerns at levels resulting from its intended technological use. In such cases, enzyme preparations are used at minimal levels for processing and are not expected to contribute significantly to dietary exposure. (化学信息网) When an ADI is not specified, it does not imply that the additive is unsafe; rather, it indicates that dietary exposure to the enzyme protein resulting from proper use is negligible and does not require a numerical ADI to ensure safety.
Comparison With Similar Additives
Carbohydrase and cellulase from Aspergillus niger can be compared with other enzyme processing aids used in food production based on their mechanistic roles and regulatory treatment. For example, amylases derived from microbial sources are used to break down starches into simpler sugars during baking and brewing, facilitating processing and improving texture. Like carbohydrase and cellulase, amylases are considered processing aids and are listed in enzyme additive regulations with specific permitted uses. (U.S. Food and Drug Administration) Another similar enzyme class is proteases, which hydrolyze peptide bonds in proteins. Protease preparations are used in applications such as tenderizing meat or hydrolyzing proteins in dairy products. As with carbohydrase and cellulase, protease enzyme preparations are evaluated for safety, identity, and purity, and are permitted in specific processes where their action confers a technological benefit.
Common Food Applications Narrative
Carbohydrase and cellulase from Aspergillus niger is principally used in selective industrial food processing steps where enzymatic breakdown of carbohydrate-rich structural components aids manufacturing. One prominent application permitted under 21 CFR 173.120 is in shellfish processing, where enzymes help detach visceral mass from edible tissues and assist in removing shells from shrimp and clams. In these applications, the enzyme preparation helps facilitate the clean separation of edible parts and reduce manual labor or physical abrasion that can damage product quality. Beyond shellfish, other enzyme preparations with similar carbohydrase and cellulase activity are commonly used in processes such as brewing, starch processing, or grain-based product manufacturing to break down complex polysaccharides into simpler carbohydrate fractions that improve filtration, texture, or processing efficiency. These uses are typically under the broader category of processing aids, which are not intended to remain in significant amounts in the final food and are not labeled as ingredients in finished products. The enzyme action enables more efficient production practices and enhances yield and consistency across batches of processed foods.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 173.120
EFSA
- Notes: Specific EFSA evaluation conclusions not directly d
JECFA
- Notes: JECFA evaluation not directly found in searchable database
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