ASPERGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID

CAS: 9001-23-4 SOLVENT OR VEHICLE

ASPERGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID refers to enzyme preparations derived from the fungus Aspergillus niger used in the recovery and processing of citric acid via fermentation. It functions as a solvent or vehicle in processing and is referenced under specific FDA regulation for solvent extraction processes.

What It Is

ASPERGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID is a technical food processing ingredient derived from the fungus Aspergillus niger intended for use in processes associated with the recovery and purification of citric acid from fermentation broths. While the name refers specifically to preparations derived from the fermentation organism itself, it is classified in regulatory contexts as a solvent or vehicle rather than a direct food component. As referenced in U.S. food additive regulations, it appears in the context of approved solvent extraction processes for citric acid production, which involve the use of a solvent system applied to the Aspergillus niger fermentation liquor to recover citric acid under defined conditions. This ingredient encompasses enzyme extracts and fermentation cell derivatives linked with Aspergillus niger’s role in industrial citric acid production, and its primary technical role relates to enabling or facilitating the extraction and purification operations rather than contributing nutritional or organoleptic value to food products. The CAS number 9001-23-4 specifically identifies this preparation in chemical registries and regulatory texts. The function classification as a solvent or vehicle indicates that the substance is used in process steps where it facilitates dissolution or transport of target compounds such as citric acid during downstream processing.

How It Is Made

The production of ASPEGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID begins with the cultivation of selected strains of the filamentous fungus Aspergillus niger in controlled fermentation systems. In industrial facilities, A. niger is cultured in nutrient-rich media containing carbohydrates such as glucose or sucrose to support robust fungal growth and metabolic activity directed toward the synthesis of citric acid. The fermentation process may be operated in submerged or solid-state formats depending on facility design and production goals, with parameters such as pH, temperature, aeration, and nutrient balance optimized to favor high-yield citric acid biosynthesis. During this process, the organism secretes a suite of enzymes and metabolites into the culture medium, and the fermentation broth becomes enriched with the target organic acid along with cell mass and extracellular proteins. To produce enzyme extracts or preparations identified under CAS 9001-23-4, specific downstream processing steps are applied to the fermentation material. These may include separation of the fungal biomass from the spent broth, concentration of soluble proteins and enzymes through filtration or centrifugation, and formulation steps where the extract is stabilized for use in downstream processing operations. When intended for use in solvent extraction processes for citric acid recovery, this preparation is integrated with solvent systems that enable selective partitioning of citric acid from the fermentation liquor. The manufacturing steps emphasize control of microbial quality, removal of undesirable byproducts, and adherence to good manufacturing practices to ensure that the derivative preparation performs consistently in food processing workflows.

Why It Is Used In Food

ASPERGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID is not a direct food ingredient consumed for flavor or nutrition but serves a critical role in enabling industrial-scale production of citric acid, a widely used food additive. Citric acid itself is a weak organic acid that functions as an acidulant, pH control agent, flavor enhancer, chelating agent, and preservative in a broad range of food and beverage applications. The technical role of the Aspergillus niger preparation lies in facilitating the solvent extraction and processing steps needed to obtain high-purity citric acid from the complex fermentation broth generated during production. By serving as a component of solvent systems or aiding in the transport or dissolution of compounds within processing operations, this preparation helps ensure that the final citric acid meets food-grade quality criteria and is suitable for incorporation into food formulations. The use of microbial fermentation and associated preparations derived from organisms like Aspergillus niger has been central to modern large-scale citric acid manufacturing for decades, with fermentation processes offering cost-effective production compared with extraction from natural plant sources. In this context, the enzyme and fermentation-derived preparations contribute to efficient recovery and purification workflows, supporting the broader food industry’s demand for citric acid as a functional ingredient.

Adi Example Calculation

To illustrate the concept of acceptable daily intake for a food additive like citric acid, consider a hypothetical ADI value that might be established by a regulatory body based on toxicological and exposure data. If an ADI were, for example, set at a certain milligram amount per kilogram of body weight per day, a person weighing 70 kilograms could consume up to a multiple of that amount daily without exceeding the established limit. In such a calculation, the ADI is multiplied by the body weight to yield an intake guideline specific to that hypothetical individual. It is important to emphasize that this calculation is illustrative and not a personalized recommendation; actual ADI values and regulatory determinations are established based on comprehensive evaluation of scientific evidence. The Aspergillus niger-derived processing preparation does not directly factor into such calculations, as it is not present in finished food products at appreciable levels, and ADI considerations apply to the purified citric acid itself.

Safety And Health Research

Scientific and regulatory evaluations of ingredients and processing aids derived from microorganisms like Aspergillus niger focus on ensuring that products used in food manufacturing do not introduce harmful contaminants or toxic components into the food supply. Aspergillus niger is a well-studied filamentous fungus with a long history of use in industrial biotechnology, particularly for the production of citric acid and certain enzyme preparations. Its application in food processing contexts has been subject to assessment to minimize risks from mycotoxin contamination or microbial impurities. Regulatory frameworks require that strains used in food-relevant processes be nonpathogenic and non-toxigenic, and that manufacturing environments implement controls to prevent introduction of undesirable byproducts. While A. niger can produce secondary metabolites under specific conditions in environmental or uncontrolled settings, fermentation strains employed in commercial citric acid production are selected and monitored to ensure consistent performance and safety. Reviews of industrial use note that citric acid and many A. niger-sourced enzymes are considered safe within the contexts of their approved applications, and safety protocols address the potential for allergenicity or mycotoxin formation through careful strain selection and process control. These assessments emphasize hazard identification and mitigation at the processing level rather than direct effects of the Aspergillus niger-derived preparation on consumers, as most of the preparation does not remain in the finished food product at significant levels.

Regulatory Status Worldwide

In the United States, the use of solvent extraction processes involving Aspergillus niger fermentation liquor to produce food-grade citric acid is addressed under Title 21 of the Code of Federal Regulations, specifically Section 173.280, which describes conditions under which such processes may be safely used to yield citric acid suitable for food applications. This regulation outlines the allowable solvent mixtures and conditions for extracting citric acid from conventional A. niger fermentation broths and emphasizes that the resulting citric acid must meet specified purity requirements. This regulatory reference confirms that the technical process incorporating the Aspergillus niger-derived preparation is recognized in U.S. food additive regulations for its role in citric acid manufacture. The broader ingredient citric acid itself is affirmed as generally recognized as safe (GRAS) for direct use in foods under separate regulatory listings, and its production via microbial fermentation including from Aspergillus niger is encompassed within established food-grade manufacturing practices. While specific regulations vary by jurisdiction globally, many regions accept microbial fermentation-derived citric acid as a standard food ingredient when produced and purified according to good manufacturing practice and local food safety standards. In international regulatory frameworks, citric acid typically carries an E-number for food additive classification, but the Aspergillus niger processing preparation is not directly categorized for consumer-level use; rather it supports manufacturing processes that yield permitted food ingredients.

Taste And Functional Properties

ASPERGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID itself is not evaluated based on sensory properties such as taste or aroma, because it is not intended as a flavoring component in finished foods. Instead, its functional properties pertain to its behavior as part of solvent systems or processing mixtures where its solubility, stability, and compatibility with other processing aids influence the efficiency of target compound recovery. Preparations from Aspergillus niger used in processing may include enzymes that remain active under certain temperature and pH conditions typical of fermentation and extraction operations, and these functional characteristics support their role in facilitating the transfer or extraction of citric acid. In general, components derived from A. niger are selected for their robustness in industrial environments, with considerations of heat tolerance, chemical stability, and minimal interference with analytical specifications of food-grade citric acid. While the preparation is not assessed for taste due to its process-level usage, the citric acid recovered through these processes imparts the familiar sour taste and acidity regulation that food scientists and consumers associate with this organic acid. Citric acid’s functional attributes in food include enhancing tartness, balancing sweetness, and serving as a chelating agent to stabilize metal ions, but these properties derive from the purified citric acid rather than the Aspergillus niger preparation used during processing.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) applies to food additives that remain in the final food product and could be consumed regularly by individuals. Citric acid, the product of the fermentation and extraction processes that involve Aspergillus niger-derived preparations, is widely used in foods and has been evaluated for safety as a direct food ingredient. In the context of ADI, regulatory bodies consider available toxicological data and long-term exposure estimates to determine safe intake levels for consumers. The ADI reflects a level at which daily consumption over a lifetime is not expected to pose health concerns based on current scientific evidence. Because citric acid is naturally occurring in many fruits and widely metabolized in the human body, its regulatory assessments often reflect a broad margin of safety. The Aspergillus niger preparation used during processing does not itself contribute to consumer intake in finished foods at levels that would necessitate an ADI, as its primary role is in processing rather than formulation. Thus, discussions of acceptable daily intake focus on the purified citric acid that reaches consumers, with regulatory evaluations confirming its safety in typical food applications and consumption patterns.

Comparison With Similar Additives

When comparing ASPEGILLUS NIGER FOR FERMENTATION PRODUCTION OF CITRIC ACID with other processing-related food additives and technical aids, it is useful to consider ingredients that facilitate recovery or modification of target compounds during manufacture. For example, enzyme preparations derived from other microorganisms such as Rhizopus species are used in starch conversion processes, where they aid in breaking down complex carbohydrates into fermentable sugars. Similarly, microbial-derived enzyme systems used in cheese production assist in protein and fat modification without contributing directly to the final food taste. These processing aids share the characteristic of being used in controlled manufacturing environments rather than as consumer-facing ingredients. Another point of comparison is the use of Candida species in alternative citric acid production processes; while the end product, citric acid, is functionally identical regardless of the microbial source, differences in production workflows, regulatory recognition, and downstream purification steps may influence the choice of organism and associated preparations. In each of these cases, regulatory frameworks and safety assessments prioritize ensuring that processing aids leave minimal residues and support the production of high-quality, safe food ingredients.

Common Food Applications Narrative

Citric acid, the target compound produced through Aspergillus niger fermentation and subsequent extraction processes, is one of the most widely applied food ingredients in the global food supply. Its utility spans a remarkable range of products, from beverages and confectionery to dairy and processed foods, because of its ability to impart a clean, tart flavor and to adjust the acidity of formulations. In soft drinks and fruit-flavored beverages, citric acid plays a central role in balancing sweetness and providing a refreshing sensory profile. In jams, jellies, and preserves, it contributes to gel setting and pH control, which are essential for product stability and shelf life. Citric acid also functions as a chelating agent in canned vegetables and ready-to-eat meals, binding metal ions that could otherwise catalyze oxidative degradation of nutrients and flavors. While the Aspergillus niger-derived preparation itself does not remain in the final food product at appreciable levels, its application in processing supports the production of the citric acid that food manufacturers depend on. In bakery products, for example, citric acid can enhance the effectiveness of leavening agents and contribute to crumb texture, while in dairy products it helps control pH for coagulation and flavor optimization. The presence of citric acid in confectionery, gum, and candies is also linked to its ability to deliver a strong sour taste that complements sweet flavor profiles. Across these varied applications, consumers encounter citric acid as a functional and sensory contributor underpinning product quality and consistency.

Safety & Regulations

FDA

  • Notes: The regulation for solvent extraction processes is specified but direct approval status for the preparation itself as a food additive is determined through compliance with these process conditions.
  • Regulation: 21 CFR 173.280

EFSA

  • Notes: No specific EFSA additive evaluation for this processing preparation identified.

JECFA

  • Notes: No JECFA evaluation for this processing preparation identified in the sources.

Sources

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