ALPHA-AMYLASE ENZYME PREPARATION FROM BACILLUS STEAROTHERMOPHILUS

CAS: 98002-53-0 ENZYME

Alpha-amylase enzyme preparation from Bacillus stearothermophilus is a microbial enzyme used in food processing, derived from fermentation of nonpathogenic Bacillus stearothermophilus.

What It Is

Alpha-amylase enzyme preparation from Bacillus stearothermophilus is a microbial enzyme preparation obtained from the culture filtrate of a pure and nonpathogenic strain of Bacillus stearothermophilus used for its catalytic ability to break down starch polymers into shorter saccharide chains. In food science, this enzyme belongs to the class of hydrolases that catalyze the endohydrolysis of 1,4-alpha-D-glucosidic linkages in starch and related polysaccharides, yielding dextrins and simpler sugars. The enzyme is identifiable by its CAS number 98002-53-0 and functions technologically as an enzyme processing aid rather than a nutritive ingredient. Alpha-amylase from Bacillus stearothermophilus is produced by controlled fermentation under food-grade conditions, ensuring the absence of pathogenic or toxicogenic traits. In regulatory contexts, it is recognized by specific references such as the United States Code of Federal Regulations (CFR) 21 CFR 184.1012, which affirms this enzyme preparation as generally recognized as safe (GRAS) when used in accordance with good manufacturing practices. The enzyme’s activity is characterized by its ability to liquefy starch by cleaving internal alpha-1,4 glycosidic bonds, a function exploited in many food processing applications. Other names for this ingredient include alpha-amylase and variants that reflect its source organism. These alternate names highlight the enzyme’s classification and microbial origin but do not change its functional role as an enzymatic processing aid in food manufacturing. While the enzyme itself does not impart sensory properties like taste or color, its catalytic action facilitates transformations that can affect texture and structure in food products.

How It Is Made

The production of alpha-amylase enzyme preparation from Bacillus stearothermophilus involves a controlled microbial fermentation process using a nonpathogenic and non-toxicogenic strain of the bacterium Bacillus stearothermophilus. In industrial settings, the microorganism is grown in submerged culture under sterile conditions with defined nutrient media that support robust growth and enzyme expression. Upon completion of fermentation, the culture broth containing the secreted enzyme is clarified by filtration to remove bacterial cells and debris, yielding a filtrate rich in the target enzyme. This filtrate may then undergo further processing to concentrate, stabilize, and formulate the enzyme into preparations suitable for food processing. Typical downstream processing includes ultrafiltration, diafiltration, and adjustment of enzyme activity to meet product specifications. The resulting enzyme preparation is generally a liquid or a stabilized concentrate that conforms to food-grade quality standards. Throughout production, Good Manufacturing Practices (GMP) and quality control measures ensure the absence of contaminants and consistency in enzyme activity. The manufacturing process for microbial enzyme preparations like alpha-amylase is designed to produce a high level of catalytic activity while minimizing residual fermentation components that are not required for the enzyme’s technological function. Regulatory specifications, such as those referenced in food additive compendia, outline the general quality criteria and acceptable manufacturing controls. Although specific proprietary steps vary among producers, the overarching principle remains consistent: to generate a safe, effective enzyme preparation under controlled fermentation and purification protocols. As with many food enzymes, the production methods are oriented toward food safety and regulatory compliance rather than modification of the enzyme’s fundamental catalytic properties.

Why It Is Used In Food

Alpha-amylase enzyme preparation from Bacillus stearothermophilus is used in food processing primarily to catalyze the hydrolysis of starch and similar polysaccharides into shorter chain sugars. This enzymatic action plays a crucial technological role in modifying the structure and functionality of starch-containing ingredients, facilitating processes such as liquefaction, viscosity control, and textural adjustment. In many food manufacturing operations, the ability to control starch breakdown efficiently can improve process consistency and quality outcomes. For example, when starch-rich materials are heated or processed, the presence of alpha-amylase can reduce gel strength and viscosity by breaking down long starch polymers into smaller saccharide units. This is particularly advantageous in the production of syrups, where controlled starch degradation is necessary to achieve desired sugar profiles, and in the modification of flour functionality for baking applications. The enzyme helps standardize dough properties and can improve handling characteristics by reducing variability associated with native starches. Additionally, the use of alpha-amylase can facilitate energy savings in industrial processes that require starch liquefaction at elevated temperatures. The enzyme’s catalytic efficiency under specific conditions allows for more predictable processing windows and improved yields. Because this enzyme preparation is used as a processing aid, it is typically added during manufacturing and may be removed or inactivated before the final product reaches consumers. Its use aligns with good manufacturing practices to achieve technological objectives without altering the intrinsic nutritional characteristics of the final food product.

Adi Example Calculation

Because alpha-amylase enzyme preparation from Bacillus stearothermophilus has been allocated an ADI "not specified" by expert committees, it is not associated with a specific numeric intake limit for the general population. An ADI "not specified" does not translate into a numerical value for calculation; rather, it reflects that, based on the available safety data, no safety concern has been identified at levels necessary for the enzyme’s technological function. Therefore, there is no illustrative calculation of milligrams per kilogram body weight per day in the context of a numerical ADI. In regulatory practice, when a numeric ADI is established for a food additive, an illustrative calculation might show how much of that additive a person of a given body weight could theoretically consume without exceeding the ADI. In contrast, for an enzyme with an ADI "not specified," such a numeric example is not applicable because the assessment indicates that chronic dietary exposure at technologically necessary levels does not raise safety concerns. This conceptual understanding highlights that ADIs are tools for ensuring safety margins rather than targets for consumer intake.

Safety And Health Research

Safety assessments for alpha-amylase enzyme preparation from Bacillus stearothermophilus focus on the characteristics of the production organism, the enzyme’s biochemical properties, and toxicological data from animal studies and other evaluations. Toxicological studies submitted to expert committees have investigated oral exposure to enzyme preparations in animal models, including rats and dogs, without identifying treatment-related adverse effects at relevant exposure levels. On the basis of these data, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) allocated an ADI "not specified" for this enzyme preparation, indicating that it does not pose a safety concern at levels consistent with good manufacturing practice. Because enzyme preparations are proteins, they are typically subject to digestion in the human gastrointestinal tract, reducing the likelihood of systemic exposure to intact active enzyme after oral intake. Safety evaluations also consider the nonpathogenic and non-toxigenic nature of the source microorganism, ensuring that no harmful metabolites or toxins are associated with the production strain. Regulatory bodies assess manufacturing controls and purity specifications to minimize residual fermentation components and contaminants in the final enzyme product. While occupational exposure to enzyme dusts in manufacturing or handling settings can be associated with respiratory sensitization in susceptible individuals, such concerns are addressed through appropriate workplace safety practices rather than dietary exposure assessments. Overall, the body of research and regulatory evaluation supports the conclusion that alpha-amylase enzyme preparation from Bacillus stearothermophilus is safe for its intended technological uses in food processing when employed under conditions consistent with regulatory guidance and good manufacturing practice.

Regulatory Status Worldwide

Regulatory authorities in key jurisdictions have evaluated alpha-amylase enzyme preparation from Bacillus stearothermophilus for its safety and suitability as a food processing aid under specified conditions. In the United States, the Food and Drug Administration (FDA) recognizes this enzyme preparation in 21 CFR 184.1012 as a substance that is generally recognized as safe when used in food in accordance with good manufacturing practices. The Code of Federal Regulations outlines that the enzyme preparation is derived from a nonpathogenic and non-toxigenic strain of Bacillus stearothermophilus and meets applicable specifications for enzyme preparations. This regulatory recognition means that manufacturers can use the enzyme within the scope of its affirmed safety status during food processing without requiring direct food additive petitions for each use. On the international stage, the Codex Alimentarius Commission includes alpha-amylase from Bacillus stearothermophilus in the Codex General Standard for Food Additives (GSFA), where it is listed with an INS (International Numbering System) designation for microbial enzyme preparations. As a Table 3 additive under the GSFA, it may be used in foods at levels consistent with good manufacturing practices, reflecting international consensus on the enzyme’s technological role and safety when used appropriately. The GSFA listing provides a harmonized reference for many national regulatory bodies in setting their own rules for enzyme use in food processing. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated alpha-amylase preparations from Bacillus stearothermophilus and allocated an ADI "not specified," indicating that, on the basis of available data, the enzyme does not present safety concerns at levels necessary to achieve its intended technological effect. This classification reflects a long-standing history of safe use and absence of evidence for toxicity under conditions of use. National and regional regulators may refer to such evaluations when establishing or revising their own food additive regulations and lists of permitted processing aids.

Taste And Functional Properties

Alpha-amylase enzyme preparation from Bacillus stearothermophilus does not contribute a discernible taste or aroma to food products. Instead, its primary influence in food systems is functional, rooted in its catalytic activity on starch molecules. By cleaving internal alpha-1,4 glycosidic bonds in starch polymers, the enzyme reduces the molecular weight of these polysaccharides and transforms them into shorter chain sugars and dextrins. This enzymatic action alters functional properties such as viscosity, gel formation, and water-binding capacity, which are critical factors in many food applications. In industrial processing, alpha-amylase performs optimally within a specific range of temperatures and pH conditions tailored to the food matrix. Because Bacillus stearothermophilus is a thermophilic microorganism, its alpha-amylase exhibits comparatively higher temperature tolerance than enzymes from mesophilic sources, making it well-suited for applications involving elevated processing temperatures. The enzyme’s stability across relevant conditions contributes to consistent performance in starch hydrolysis, enabling processors to predictably adjust product texture and functionality. From a sensory perspective, while the enzyme itself is tasteless and odorless, the breakdown products of starch can influence sweetness perception in final products if residual sugars remain. However, in many applications the enzyme is inactivated or removed prior to consumption, limiting such effects. Overall, the functional properties of this enzyme preparation support technological goals in food manufacturing without imparting direct sensory impacts on taste or smell.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept used to express the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data. For many food additives and processing aids, including enzyme preparations, toxicological evaluations consider factors such as potential systemic exposure, metabolic handling, and results from animal studies to determine whether an ADI needs to be established. In the case of alpha-amylase enzyme preparation from Bacillus stearothermophilus, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) allocated an ADI "not specified," indicating that, based on available data, the enzyme does not pose a safety concern at levels necessary to achieve its intended technological effect in foods. An ADI of "not specified" is often interpreted by regulators to mean that a numerical ADI is not deemed necessary because the substance is of low toxicological concern and use levels are limited by technological need. This designation reflects expert judgment rather than a specific numeric value and is consistent with the nature of many enzyme processing aids. It is important to note that an ADI, whether specified numerically or designated as "not specified," is distinct from a recommended intake or a nutritional requirement. The ADI framework is a safety assessment tool used by regulatory authorities to manage potential risks from chronic dietary exposure. When an enzyme is designated with an ADI "not specified," it underscores that, within the context of its technological function and typical exposure levels, there is no evidence suggesting the need for a quantified intake limit to protect public health.

Comparison With Similar Additives

Alpha-amylase enzyme preparation from Bacillus stearothermophilus can be compared with other microbial enzyme preparations that serve similar technological roles in food processing. For instance, alpha-amylase from Bacillus licheniformis is another starch-hydrolyzing enzyme used in many industrial applications. Both enzymes catalyze the breakdown of internal alpha-1,4 glycosidic linkages in starch polymers, but they may differ in optimal temperature and pH profiles due to the source organism’s characteristics. The enzyme from Bacillus stearothermophilus, being derived from a thermophilic bacterium, often exhibits higher thermostability compared with enzymes from mesophilic sources, which can be advantageous in high-temperature processing. Another related additive is glucoamylase, which also acts on starch but cleaves terminal glucose units, producing glucose rather than a mixture of shorter sugars. While glucoamylase and alpha-amylase both contribute to starch modification, their different modes of action result in distinct functional outcomes, with glucoamylase often used when glucose-rich syrups are the processing goal. Enzymes such as pullulanase and beta-amylase also participate in starch conversion but target specific linkages or structural motifs, offering complementary functionality in combination with alpha-amylase preparations. These comparative perspectives highlight that while many microbial enzymes are available for starch processing, the choice of a particular enzyme preparation depends on the desired processing conditions, product specifications, and stability requirements, rather than differences in basic safety profiles.

Common Food Applications Narrative

Alpha-amylase enzyme preparation from Bacillus stearothermophilus is widely used in food processing applications that involve starch modification. Its catalytic ability to break down complex starch molecules into simpler sugars makes it a valuable tool in industries that handle high-starch raw materials, such as cereals, tubers, and legumes. In the baking industry, for example, alpha-amylase helps improve dough handling and consistency by reducing excess viscosity from native starches and promoting uniform fermentation. Bakers may use flour treated with this enzyme to achieve predictable crumb structure and volume in bread and other baked goods. Beyond baking, the enzyme plays an important role in the production of sugar syrups and sweeteners, where it contributes to the initial liquefaction steps that transform starch into fermentable sugars. In processes that produce maltose-rich syrups or dextrin syrups, controlled application of alpha-amylase enables processors to achieve targeted sugar profiles that meet product specifications. The enzyme is also used in the brewing industry to break down starches in malted grains, facilitating the extraction of fermentable sugars during mash preparation. In dairy and beverage applications, alpha-amylase may be applied to starch-thickened beverages to adjust mouthfeel, clarity, and stability. Its action can prevent undesirable thickening or gel formation during processing. Across these and other applications, the enzyme’s function is technological rather than nutritive, aiding in the transformation of raw materials into finished products with desired functional characteristics. Food processors incorporate the enzyme at specific stages of production and typically inactivate or remove it during subsequent steps, ensuring that its role in processing is fulfilled without residual activity in the final consumer product.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 184.1012

EFSA

  • Notes: EFSA specific approval details and numeric ADI not found in available authoritative sources

JECFA

  • Notes: JECFA year of evaluation not explicitly shown in d summaries
  • Ins Number: 1100
  • Adi Display: Not specified

Sources

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