GLUCOSE OXIDASE FROM PENICILLIUM NOTATUM
Glucose oxidase from Penicillium notatum is a microbial enzyme preparation that catalyzes the oxidation of glucose and is recognized for technical applications in food processing. It is included in regulatory food ingredient inventories such as the U.S. FDA Substances Added to Food inventory and is analogous to glucose oxidase enzymes evaluated by international authorities as a food additive. Regulation globally requires evaluation for safe use and identity/purity specifications, and international bodies list enzymes of this class in additive compendiums. Glucose oxidase has a broad history of use in dough and food processing environments.
What It Is
Glucose oxidase from Penicillium notatum is a microbial enzyme preparation that belongs to the oxidoreductase class of proteins. Enzymes of this type catalyze the oxidation of glucose by molecular oxygen, yielding D-glucono-delta-lactone and hydrogen peroxide as reaction products. In food technology contexts, glucose oxidase is valued for its ability to influence oxygen levels and oxidative processes in doughs, batters, and other food matrices. The form produced by Penicillium notatum is recognized in regulatory inventories such as the U.S. Food and Drug Administration's Substances Added to Food inventory, where it is assigned the internal substance identifier and associated with CAS number 977090-09-7. Listings in such inventories indicate technical acknowledgement by regulatory bodies but do not by themselves equate to a specific codified regulation in the United States. Enzymes like glucose oxidase are typically proteins of substantial molecular weight composed of amino acid sequences that confer catalytic specificity for glucose. The enzyme prepared from Penicillium notatum is historically derived by fermentation of the fungal culture followed by extraction and formulation procedures adapted for food processing applications. The activity of the enzyme, measured in units, depends on its ability to catalyze the oxidation of glucose under controlled conditions. Although the term "notatin" has been historically used to refer to certain glucose oxidase preparations from related fungi, in regulatory food additive contexts glucose oxidase preparations are generally described by their enzymatic activity and source organism. Globally, enzyme preparations that serve technological functions in food processing are subject to safety evaluations by competent authorities. For example, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) maintains a database of enzyme specifications and evaluations that include glucose oxidase under the International Numbering System (INS) number 1102 for microbial enzyme preparations. This listing reflects an enzyme class rather than a specific protein from a single source organism, and it indicates the enzyme class has been reviewed for recommended specifications of identity and purity but does not establish a numeric acceptable daily intake (ADI) since typical food enzyme preparations are expected to be used at levels consistent with current good manufacturing practices rather than set maximum residues. Enzymes such as glucose oxidase are handled differently in regulatory frameworks than direct food additives that confer nutritive value, preservatives, colors, or other traditional additive functions. In summary, glucose oxidase from Penicillium notatum is a microbial enzyme preparation used for its catalytic activity on glucose, recognized in regulatory inventories and subject to safety and specification evaluation processes administered by food safety authorities worldwide.
How It Is Made
The production of glucose oxidase from Penicillium notatum for use in food processing begins with the controlled cultivation of the Penicillium notatum fungal strain under conditions that promote robust enzyme expression. In such fermentation processes, the microorganism converts a carbohydrate substrate, such as glucose, into biomass and secreted enzyme into the culture medium. After a period of fermentation, the culture broth containing the extracellular enzyme is subjected to a series of downstream processing steps to isolate and concentrate the active enzyme protein. Typical purification approaches include filtration to remove microbial cells and solid particulates, followed by concentration using ultrafiltration, precipitation, or chromatography techniques to enrich for the enzyme of interest. Enzyme preparations intended for food use are refined to remove residual microbial biomass and low molecular weight impurities, and the final preparation is adjusted to achieve a defined activity level and stability profile that meets established identity and purity specifications. These specifications are important for compliance with regulatory enzyme preparation standards such as those compiled by international bodies like JECFA. The enzymatic protein itself is a complex three-dimensional structure composed of polypeptide chains that adopt a conformation capable of binding glucose and catalyzing its oxidation in the presence of oxygen. In production contexts, parameters such as pH, temperature, and dissolved oxygen levels are monitored and controlled during fermentation to maximize yield. Following recovery from the fermentation broth, the enzyme preparation may be stabilized with food-grade carriers or excipients to facilitate handling and storage. Stability considerations include maintaining enzymatic activity during storage and ensuring that denaturation does not occur prematurely. The final enzyme preparation is assayed to verify its catalytic activity and to confirm that it conforms to defined analytical standards for glucose oxidase, including specific activity and absence of undesirable contaminants. Enzyme manufacturing for food applications must also address microbial safety criteria, ensuring that the final product does not contain pathogenic or toxigenic organisms and adheres to established microbiological criteria for food enzymes. In many jurisdictions, producers of enzyme preparations also implement quality control systems such as hazard analysis and critical control point (HACCP) programs to provide assurance of consistent production quality. The formulation of glucose oxidase from Penicillium notatum into a stable food enzyme preparation reflects a balance between effective catalytic function and compliance with regulatory expectations for identity, purity, and food safety. Producers often reference international guides on enzyme production and purification to align with best practices in the industry.
Why It Is Used In Food
Glucose oxidase from Penicillium notatum is employed in food processing because its catalytic activity on glucose yields changes in oxygen levels and redox balance that are technologically useful. The enzyme catalyzes the oxidation of glucose in the presence of molecular oxygen, producing a lactone form of gluconic acid and hydrogen peroxide. In baking applications, for instance, this oxidative activity can contribute to dough conditioning by influencing gluten network formation, which may improve dough rheology and handling properties. The removal of dissolved oxygen by the enzymatic reaction may also reduce oxidative degradation of sensitive food components, such as certain lipids and pigments, and support improved retention of color and flavor quality during processing. Food producers often select glucose oxidase preparations to achieve specific functional outcomes, such as strengthening dough structure, optimizing texture, or supporting consistency of processed products. Because the enzymatic reaction consumes oxygen, glucose oxidase has been used in contexts where controlling oxidative processes is desirable, including in the production of certain beverages or packaged products where minimizing oxygen exposure reduces the potential for spoilage or off-flavor development. Enzymes are typically chosen for such functions because they act catalytically at low usage levels and are denatured during subsequent heat treatment or cooking steps, leaving minimal active enzyme in the finished product. The use of glucose oxidase aligns with the principle that food processing aids should facilitate technological objectives without compromising food safety or nutritional quality. The enzyme’s action on glucose does not introduce new toxicological hazards when used within good manufacturing practices, and the reaction products such as gluconic acid are naturally occurring compounds that are commonly present in foods. The hydrogen peroxide formed in the reaction is typically rapidly decomposed or consumed in subsequent processing steps and does not accumulate in significant amounts in finished foods. These functional attributes explain why glucose oxidase preparations have been incorporated into a range of food production workflows to support quality, processing efficiency, and consistency.
Adi Example Calculation
Because glucose oxidase preparations do not have a numeric acceptable daily intake (ADI) specified by international expert evaluations, a traditional calculation of ADI exposure is not applicable. ADI calculations are typically performed for food additives with defined ADI values, where the intake estimate is compared with the numeric ADI to assess safety for a given body weight. In the case of glucose oxidase, international additive specifications list the enzyme class under INS 1102 without an ADI specification, indicating that it is expected to be safe when used in accordance with good manufacturing practices and intended technological functions. The absence of an ADI does not negate safety considerations; rather, it reflects regulatory recognition that the enzyme is denatured during food processing and that dietary exposure to intact active enzyme is minimal. A hypothetical calculation might consider the amount of enzyme preparation applied in a dough formulation and the degree to which it is inactivated by baking, showing that the residual enzyme activity and protein content in the finished bread are negligible. However, because no numeric ADI is assigned, numerical comparison to an ADI value is not performed. This approach is consistent with regulatory frameworks that treat enzyme preparations differently from additives with persistent activity in foods.
Safety And Health Research
Safety evaluations of enzyme preparations such as glucose oxidase focus on aspects related to the production organism, the enzyme protein itself, and potential dietary exposure under intended use conditions. Enzyme preparations used in food processing are typically proteins that are catalytically active during specific stages of manufacturing and are denatured by subsequent thermal treatments such as baking or pasteurization, limiting active enzyme presence in finished foods. Safety research for food enzymes often includes assessments of allergenic potential, toxicological studies, and analysis of production organism safety. For example, evaluations conducted by regulatory bodies such as the European Food Safety Authority (EFSA) on glucose oxidase preparations derived from closely related microbial strains have included assessments of genotoxicity, repeated dose toxicity studies, and sequence homology analyses to identify potential allergenicity concerns. Those evaluations concluded that specified glucose oxidase preparations did not give rise to safety concerns under the intended conditions of use, while acknowledging that food enzymes can share structural similarities with known allergens and that the risk of allergic reactions cannot be entirely excluded but is low under typical dietary exposure scenarios. Toxicological studies for enzyme preparations often involve repeated dose oral toxicity testing in animal models to identify any adverse effects at doses much higher than expected dietary exposure, providing large margins of safety. Dietary exposure estimates consider the amount of enzyme preparation that may remain in food products following processing and the likely consumption patterns of those products. Allergenicity assessments typically involve bioinformatic comparisons of the enzyme’s amino acid sequence with known allergenic proteins, as well as consideration of empirical data from human exposures where available. Because enzymes such as glucose oxidase are proteins, they are generally susceptible to digestive degradation, which reduces the likelihood of systemic exposure to intact protein in the gastrointestinal tract. Overall, safety and health research for glucose oxidase preparations used in food processing emphasizes evidence-based evaluation of potential hazards, consideration of processing conditions that denature the enzyme, and adherence to good manufacturing practices that limit residual enzyme in finished products. Regulatory evaluations by competent authorities incorporate these factors into their risk assessments to ensure that enzyme preparations used in food manufacturing are safe for consumers when used within defined technological and processing parameters.
Regulatory Status Worldwide
Regulatory frameworks governing the use of enzyme preparations in foods vary by jurisdiction, with international bodies providing guidance on identity and purity specifications and national authorities defining local use conditions. In the United States, glucose oxidase from Penicillium notatum is recognized in the Food and Drug Administration’s Substances Added to Food inventory, which lists ingredients and processing aids that have been added to food in commerce or evaluated by expert bodies. Inclusion in this inventory reflects its acknowledgment by the agency as a substance used in food processing contexts, but does not by itself establish a specific section of the Code of Federal Regulations that codifies its permissible uses and conditions. The FDA inventory entry does not affirm a numeric ADI or explicit regulatory limits, and the agency’s position on the ingredient’s safety is reflected in the inventory’s role as a reference to expert evaluations rather than a prescriptive approval. In addition, enzyme preparations such as those used in food processing can be subject to Generally Recognized as Safe (GRAS) notifications; for example, specific glucose oxidase enzyme preparations produced using recombinant technology have been the subject of GRAS notices submitted to the FDA, with letters indicating that the agency had no questions about the notifier’s conclusion of safety for specified uses in baking processes. At the international level, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) lists glucose oxidase under the International Numbering System (INS) number 1102 for microbial enzyme preparations, indicating that the enzyme class has been evaluated for identity and purity specifications without assigning a numeric acceptable daily intake, which is common for food enzymes when used at levels consistent with good manufacturing practices. The JECFA database identifies glucose oxidase and related synonyms under its food additive monograph system, providing an authoritative reference for identity and specification criteria. In the European Union, food enzyme preparations intended for market use are subject to safety evaluations by the European Food Safety Authority (EFSA), which assesses production methods, potential toxicological concerns, and dietary exposure. Safety evaluations for glucose oxidase derived from related microbial sources have been published by EFSA panels, concluding that specified enzyme preparations do not give rise to safety concerns under intended conditions of use. Requirements in the EU include adherence to a positive list of authorized food enzymes, compliance with technological need criteria, and specification of uses in food categories under good manufacturing practice conditions. Overall, regulatory statuses worldwide recognize glucose oxidase as a food processing enzyme that requires evaluation and specification adherence rather than numeric intake limits. The enzyme’s inclusion in inventories and additive lists reflects its acceptance for technological use in food processing when conforming to regulatory standards and safety assessments conducted by competent authorities.
Taste And Functional Properties
Glucose oxidase, by nature of its enzymatic function, does not contribute a distinct taste to food products when used at levels typical of food processing aids. Its primary functional properties arise from its catalytic oxidation of glucose and the attendant removal of oxygen. This action can have indirect effects on sensory attributes; for example, reducing oxygen in dough systems may support better retention of volatile aroma compounds and stabilizing color in processed foods. Because the enzyme does not remain active after heat treatments such as baking or pasteurization, it does not impart flavor changes in most finished products. The reaction products of glucose oxidation, including gluconic acid or its lactone form, may contribute subtly to acidity, but such effects are typically negligible at the low usage levels applied in food processing. Functionally, glucose oxidase demonstrates activity over a specific range of pH and temperature conditions that are compatible with many food processing environments. Enzyme activity is influenced by factors including substrate availability (glucose concentration), pH, temperature, and dissolved oxygen levels. The enzyme’s catalytic efficiency and stability profile are important considerations when formulating it into food processing systems. Because it operates at moderate temperatures and can be denatured at higher heat, its functional window often aligns with the stages of processing where oxygen removal or oxidative modification is needed prior to thermal treatments that inactivate the enzyme. In terms of solubility, glucose oxidase preparations are typically formulated as water-dispersible powders or liquids that allow them to be easily incorporated into aqueous food systems such as doughs, batters, and beverage formulations. The enzyme’s proteinaceous nature means it may interact with other food components, but such interactions are generally considered in formulation design to ensure consistent performance. Overall, the taste neutrality and functional capacity of glucose oxidase to modulate oxidative conditions make it a versatile processing aid in applications where dough quality or oxidative stability are key concerns.
Acceptable Daily Intake Explained
Acceptable daily intake (ADI) is a concept used by regulatory and scientific bodies to define the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. For conventional food additives that remain in food products and contribute directly to dietary exposure, numeric ADI values are often established based on toxicological data and safety factors. However, for many food enzyme preparations such as glucose oxidase, a numeric ADI is not specified because the enzyme is used at low levels consistent with good manufacturing practices, is denatured during food processing, and is composed of proteinaceous material that is readily digested in the gastrointestinal tract. In international additive evaluations such as those maintained by JECFA, glucose oxidase and related enzyme preparations are listed under INS number 1102 with an indication that an ADI is not specified, reflecting the assessment that the enzyme’s use does not necessitate a numeric intake limit when employed as intended. The lack of a specified ADI for glucose oxidase does not imply unrestricted use; rather, it reflects the characterization of food enzymes in regulatory frameworks where technological need, safety evaluation of the production organism, and manufacturing practices govern how the enzyme is incorporated into processing. In practice, enzyme use levels are set by manufacturers to achieve desired technological outcomes without leaving significant active enzyme in finished products. Regulatory authorities expect food enzymes to be used in accordance with good manufacturing practices, which include consideration of minimal effective amounts and control of residual activity post-processing. This approach aligns with broader principles in food safety that focus on ensuring ingredient use does not pose health risks when applied under defined conditions. For consumers, the concept of an ADI for enzymes like glucose oxidase may be less relevant than for traditional additives because the enzyme is largely inactivated during cooking and digestion, and the reaction products such as gluconic acid are common dietary constituents. Nevertheless, regulatory evaluations that categorize an enzyme as having no specified ADI are based on safety data, understanding of the enzyme’s fate in food systems and the body, and confidence that typical use conditions do not present health concerns.
Comparison With Similar Additives
Glucose oxidase from Penicillium notatum can be compared to other enzyme-based food processing aids that serve technological functions. One such additive is amylase (INS 1100), an enzyme that catalyzes the breakdown of starch into simpler sugars and is widely used to improve fermentation and texture in bakery products. Unlike glucose oxidase, which modulates oxygen levels and oxidative conditions, amylase’s role is centered on carbohydrate breakdown and fermentation efficiency. Both enzymes operate within specific pH and temperature windows compatible with food processing environments, and both are denatured during subsequent heat treatments. Another comparable enzyme is invertase (INS 1103), which catalyzes the hydrolysis of sucrose into glucose and fructose. Invertase is often used in confectionery to influence sweetness and texture, whereas glucose oxidase affects oxidative conditions. Invertase’s functional outcomes center on sugar composition and textural modification, while glucose oxidase’s outcomes are related to oxygen scavenging and dough conditioning. A third example is lipase (INS 1104), which catalyzes the hydrolysis of triglycerides into fatty acids and glycerol and may be used in flavor development or modification of fat-containing products. Lipase’s activity directly alters lipid components, whereas glucose oxidase’s indirect action on oxidative environments affects a broader range of biochemical reactions in doughs and beverages. Despite differences in function, all these enzyme additives share common regulatory considerations: they are used at levels consistent with good manufacturing practices, are proteins that are denatured during processing, and do not generally require numeric ADIs. Their selection in food processing depends on specific technological objectives, such as textural modification, fermentation enhancement, or oxidative control. Manufacturers choose among these enzymes based on the desired functional outcome in the final product and the compatibility of the enzyme’s activity with the processing conditions applied.
Common Food Applications Narrative
Glucose oxidase from Penicillium notatum finds application across a variety of food processing contexts where its catalytic ability to consume oxygen and modulate oxidative conditions benefits product quality and processing performance. In bakery applications, the enzyme is often utilized as a dough conditioner to improve rheological characteristics and support consistent texture in breads, rolls, and other baked goods. By facilitating controlled oxidation of glucose in dough systems, glucose oxidase can contribute to the strengthening of gluten networks, which in turn can enhance dough handling, gas retention, and final product volume and crumb structure. Beyond bakery applications, glucose oxidase may be used in the preparation of certain beverage products where oxidative stability is a concern. In beverage processing, minimizing oxygen levels can support the preservation of desirable color, flavor, and nutrient profiles, particularly in oxygen-sensitive products. The enzymatic removal of dissolved oxygen prior to packaging can also help reduce the potential for oxidative changes during storage. In addition to these uses, glucose oxidase finds roles in specialty food formulations where controlling oxidation at specific stages of processing contributes to overall product quality. Because glucose oxidase is denatured during subsequent heat treatments such as baking or pasteurization, it is considered a processing aid that does not remain active in the finished product. Its application in food workflows is therefore focused on achieving specific technological objectives during production rather than imparting functional activity in the finished food itself. The enzyme’s compatibility with a range of food processing steps, from mixing to heat treatment, makes it a flexible tool for manufacturers seeking to optimize product quality attributes. The enzyme’s usage is typically implemented in conjunction with other processing controls and ingredients to achieve balanced functional outcomes in finished products, and it is selected for inclusion based on its specific utility in managing oxidative conditions during production.
Safety & Regulations
FDA
- Notes: Inclusion in the FDA Substances Added to Food inventory indicates recognition for use but does not by itself establish codified approval or specific CFR sections; status is not confirmed as approved by regulation.
EFSA
- Notes: EFSA evaluates food enzyme preparations such as glucose oxidase for safety under intended conditions, but specific E number assignment for this source was not verified.
JECFA
- Notes: JECFA lists glucose oxidase under INS 1102 with no specified ADI, reflecting common usage assessments rather than numeric intake limits.
- Ins Number: 1102
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