ROSIN, PARTIALLY DIMERIZED, CALCIUM SALT
Rosin, partially dimerized, calcium salt is a rosin derivative used as a surface-finishing agent in indirect food contact applications such as coatings and adhesives under specified conditions of good manufacturing practice.
What It Is
Rosin, partially dimerized, calcium salt is a chemically modified natural resin derivative formed from rosin that has been partially dimerized and converted to its calcium salt form for technical use in food contact applications. It is identified by the CAS number 977051-86-7 and is recognized in regulatory inventories for indirect food additives in the United States. Rosin itself is a complex mixture of organic compounds obtained from pine tree oleoresin after removal of volatile components, and the partially dimerized calcium salt form involves a controlled chemical modification designed to alter its physical properties such as solubility and melting behavior. The function of this ingredient is classified as a surface-finishing agent, meaning it is primarily used to impart desired surface characteristics in coatings or finishes that come into contact with food or food packaging. Its inclusion in regulatory listings under specific parts of Title 21 of the Code of Federal Regulations (CFR) means it is authorized for use in specific indirect applications when used in accordance with good manufacturing practice and within the constraints of those regulations. The authorized applications cover areas such as coatings on fresh produce, adhesives, paper and paperboard components, and other food contact surfaces where a surface-finishing agent may be required to achieve technical performance objectives without direct addition to the food itself. Regulatory references such as 21 CFR 172.210, 175.105, 176.200, and 178.3870 indicate where detailed conditions of use are defined, including the types of articles, limitations on quantities used, and compositional standards that must be met for compliance. Given its specific technical use and the manner in which it is regulated, this compound is not directly added to food as a functional ingredient in the food product itself but is part of materials or coatings that contact food under controlled conditions.
How It Is Made
The production of rosin, partially dimerized, calcium salt begins with natural rosin, a complex mixture of resin acids chiefly derived from the oleoresin of pine trees. Natural rosin is obtained by distilling the volatile terpene fractions from crude pine oleoresin, leaving behind a resin-rich material composed primarily of resin acids. This base material is then subjected to a dimerization process, often catalyzed by acids, that encourages the formation of dimeric resin acid structures. Dimerization alters the molecular weight distribution of the resin, increasing molecular complexity and modifying physical properties such as viscosity and melting point. The partially dimerized rosin is then reacted with a calcium source, typically calcium hydroxide or calcium oxide, under controlled conditions to form the calcium salt of the partially dimerized acid mixture. The resulting calcium salt form is generally less soluble in water and may have enhanced adhesion or compatibility with various polymeric substrates used in food contact applications. In practice, manufacturing rosin derivatives like this requires careful control of reaction conditions — including temperature, reaction time, catalyst concentration, and purification steps — to achieve consistent performance characteristics and to meet regulatory and technical specifications. Purification steps may include filtration, solvent extraction, and distillation to remove unreacted materials, catalysts, or undesirable byproducts. Chemical characterization techniques such as infrared spectroscopy, acid number measurement, and drop-softening point determination are used to ensure that the product conforms to specification limits where defined. While specific processing details vary among manufacturers and may be proprietary, the general pathway involves taking naturally derived rosin, chemically modifying it through dimerization, and converting it to the calcium salt to yield a surface-finishing agent appropriate for use in indirect food contact materials. Given that this ingredient is used in contact surfaces rather than directly in food, specifications focus on technical performance and compatibility with polymers and coatings rather than on flavor or nutritional impact. (联邦公报
Why It Is Used In Food
Although rosin, partially dimerized, calcium salt is not a traditional food ingredient like a vitamin or preservative, it serves an important technological function in food contact materials. Its primary purpose is to improve the performance of surface finishes, coatings, adhesives, and other materials that may come into indirect contact with food. In the context of coatings, this rosin derivative can contribute to improved adhesion, surface smoothness, resistance to moisture, and compatibility with the polymeric or paper substrates commonly used in packaging. In adhesive applications, the compound can help ensure that coatings bond effectively without compromising the integrity of the food contact surface. These functions are essential in maintaining the quality and safety of food packaging, protecting food from contamination, and ensuring that packaging materials perform as intended during storage, transport, and use. Regulatory listings specify that such substances must be used in accordance with good manufacturing practice — meaning that they are applied at levels no greater than necessary to achieve their intended effect and that their use does not result in harmful residues transferring to food. The regulatory references associated with this ingredient, including 21 CFR 172.210, 175.105, 176.200, and 178.3870, identify permitted uses and conditions under which the ingredient can be applied in coatings on fresh citrus fruit, as components of adhesives, in paper and paperboard components, and in certain adjuvants or production aids. Because the compound’s function is tied to material properties rather than contributing flavor, nutrition, or preservation directly to the food itself, it is categorized distinctly from direct food additives. Its use addresses specific formulation challenges — for example, creating a coating that resists cracking, delamination, or undesired interaction with the food surface — which helps maintain product quality and extend shelf life. In all cases, the overarching principle is that the substance must be handled and incorporated in ways consistent with regulatory expectations for indirect food contact substances, prioritizing safety, stability, and performance without contributing harmful residues to food products.
Adi Example Calculation
Since a specific ADI for rosin, partially dimerized, calcium salt has not been established by authoritative food safety bodies, an ADI example calculation in numeric terms cannot be presented for this compound. Instead, to illustrate the general concept used for additives where ADIs are defined, consider a hypothetical substance with an ADI of 1 mg/kg bw/day. For an individual weighing 70 kg (about 154 pounds), the calculation would be: 70 kg body weight x 1 mg/kg bw/day = 70 mg/day. This means that, based on the established ADI, up to 70 mg of the hypothetical additive could be ingested daily over a lifetime without appreciable health risk, assuming exposure at that level consistently and that the ADI is based on robust toxicological data with appropriate safety factors. For compounds like indirect food contact substances where migration into food is generally low and regulated through conditions of use, the focus is on ensuring that any potential exposure remains well below levels of toxicological concern rather than calculating an ADI. The example above demonstrates how ADI calculations are applied when numeric values are available for direct food additives, but such an example should not be directly interpreted for surface-finishing agents that are authorized under specific regulations for indirect applications.
Safety And Health Research
Regulatory assessments for rosin, partially dimerized, calcium salt focus primarily on its safety in the context of indirect food contact use rather than its pharmacological or nutritional effects. Because it is used in materials and coatings that may contact food surfaces, safety considerations emphasize minimizing potential migration into food, ensuring that any residues remain below levels that could pose health risks under conditions of intended use. Toxicological data specific to this compound are limited in publicly available regulatory sources. However, broader assessments of rosins and rosin derivatives — including related compounds such as the calcium salt of partially dimerized rosin — indicate that these materials are complex mixtures derived from natural resin acids and that their safety profiles are evaluated based on structural similarity to other rosin derivatives whose toxicological data may be better characterized. Evaluations conducted by agencies such as the United States Environmental Protection Agency (EPA) in the context of pesticide inert ingredient reassessment for similar materials note that rosins and rosin derivatives may have low to moderate concerns for dermal or respiratory sensitization and that overall absorption through oral, dermal, or inhalation routes is considered poor, resulting in low expected exposure levels under typical use scenarios. In assessments of related materials, the conclusion has been that there is a reasonable certainty that exposure at expected levels — including through food contact scenarios — would not result in harm to human health when used as intended. Safety considerations typically include evaluating potential migration of components into food, the chemical stability of the substance in contact materials, and any evidence of genotoxicity, carcinogenicity, reproductive toxicity, or other systemic effects from chronic exposure. Regulatory bodies require that indirect food contact substances meet good manufacturing practice (GMP) standards, which include ensuring technical necessity and minimizing levels used to achieve the intended effect, consistent with safety objectives. In the absence of specific toxicological studies on this compound in the public domain, safety evaluations rely on the broader knowledge base for rosin derivatives and the conditions specified in regulatory listings that limit its use and potential exposure. Overall, based on regulatory assessments and structural considerations of related materials, this ingredient is regarded as having a safety profile appropriate for its indirect use when handled and applied according to established regulatory conditions and good manufacturing practices. (FDA HFP App External
Regulatory Status Worldwide
The regulatory framework governing rosin, partially dimerized, calcium salt is centered on its use as an indirect food contact substance rather than a direct food additive. In the United States, the Food and Drug Administration (FDA) maintains inventories that list substances authorized for use in specific food contact applications when used in accordance with good manufacturing practice and under defined conditions. The ingredient appears in the FDA’s inventory of indirect food additives with regulatory references such as 21 CFR 172.210 (coatings on fresh citrus fruit), 175.105 (adhesives), 176.200 (paper and paperboard components), and multiple sections under 178.3120, 178.3800, 178.3850, and 178.3870, which cover adjuvants, production aids, preservatives for wood, reinforced waxes, and rosin derivatives used in food contact materials. These listings indicate the contexts in which the ingredient may be used and the governing sections of Title 21 of the Code of Federal Regulations that describe permitted applications and associated constraints. Although the inventory entries confirm that the substance is recognized for use in specified applications, it is not listed as a direct food additive with an established acceptable daily intake because its function is tied to materials and coatings that contact food rather than being added directly to food products themselves. In other jurisdictions such as the European Union, regulatory evaluation of food contact substances is conducted by bodies like the European Food Safety Authority (EFSA), but specific evaluations or authorizations for this exact compound were not identified in the available authoritative sources. EFSA’s work on related rosin derivatives such as glycerol esters of wood rosin (E 445) provides context on how rosin-based substances may be assessed for food additive use in the EU, though those evaluations pertain to different chemical forms with direct additive functions and defined food categories of use. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) serves as an international scientific advisory body that evaluates food additives and provides technical advice; however, a specific evaluation for this compound was not found in the authoritative database. In summary, regulatory status in the United States confirms authorized use in defined indirect applications under specific CFR sections, while regulatory bodies in other regions may consider related compounds under broader frameworks for food contact materials. The absence of specific direct food additive evaluations reflects the ingredient’s role in material science applications rather than as a nutritive or preservative ingredient in food formulations.
Taste And Functional Properties
As a surface-finishing agent rather than a direct food ingredient, rosin, partially dimerized, calcium salt does not contribute taste, aroma, or sensory attributes to food products in any intentional way. It is selected for its functional properties in materials and coatings, particularly where interactions between packaging materials and food surfaces require technical performance characteristics. These performance traits stem from the chemical structure of the compound, which confers properties such as controlled solubility, adhesion, thermal behavior, and compatibility with polymers and other coating components. In practical terms, surface-finishing agents like this are formulated into coatings and adhesives to achieve a smooth, uniform surface that can withstand mechanical stress, temperature changes, and exposure to moisture or oils. Although the compound itself is not expected to migrate into food at levels that would impact flavor or mouthfeel when used according to regulatory constraints, its physical and chemical behavior in materials influences how coatings perform. Properties such as viscosity, film formation, drop-softening point, and interaction with other formulation ingredients are critical to achieving the desired finish and performance in food contact applications. By modifying natural rosin into a partially dimerized calcium salt, manufacturers can tailor these functional properties to specific application needs — for example, optimizing the balance between flexibility and hardness in a coating, or ensuring that an adhesive layer adheres well without excessive tackiness or brittleness. Because sensory perception is not directly relevant to the ingredient’s role, it is not characterized for taste or aroma in the way that flavoring agents are. Instead, the focus is on how the material behaves structurally and chemically in the matrices where it is incorporated. Functional behavior under different temperatures, pH conditions, and mechanical stresses is assessed to ensure that coatings or finishes maintain their integrity and do not degrade or separate in ways that could compromise food safety or packaging performance. Overall, the technical profile of this compound reflects its designed purpose in material science rather than culinary or sensory impact. (联邦公报
Acceptable Daily Intake Explained
Acceptable Daily Intake (ADI) is a concept used by food safety authorities to quantify the amount of a particular substance that can be ingested daily over a lifetime without appreciable risk to health. It is typically expressed in terms of milligrams of the substance per kilogram of body weight per day (mg/kg bw/day). For many direct food additives, ADIs are established through detailed toxicological assessments that include chronic feeding studies, reproductive and developmental toxicity evaluations, and other endpoints to identify the level at which no adverse effects are observed in animal studies. A safety factor is then applied to account for uncertainties when extrapolating to humans. In the case of rosin, partially dimerized, calcium salt, an ADI specific to this compound has not been defined in publicly available authoritative sources because it is not primarily used as a direct food ingredient but as an indirect food contact substance. Indirect food contact substances are managed differently: regulatory frameworks focus on ensuring that migration into food under conditions of intended use is minimized and that any potential exposure remains below levels that could cause harm based on toxicological considerations of structural analogs and related compounds. When ADIs are established for related rosin derivatives that are used as food additives — for example, glycerol esters of wood rosin in the European Union — these values are based on evaluations of toxicological data specific to those substances and may not directly apply to other derivatives with different chemical compositions or use contexts. In essence, the ADI concept illustrates how regulators balance the potential toxicity of a substance with expected exposure levels. For direct additives, this results in a numeric ADI value after rigorous evaluation. For indirect substances like surface-finishing agents, the focus is on limiting exposure through controlled use conditions and compliance with good manufacturing practice to ensure safety without assigning a numeric ADI. This reflects a precautionary approach that considers the route of exposure, the chemical nature of the substance, and the context of its use in materials that contact food rather than being consumed as part of the food itself.
Comparison With Similar Additives
Surface-finishing and resin-derived additives encompass a range of related compounds that serve functional roles in food contact materials and coatings. Rosin, partially dimerized, calcium salt is one such derivative of natural rosin, and comparing it with similar substances helps clarify its place in regulatory and technical contexts. For example, rosin esters (such as glycerol esters of wood rosin used as food additives in some regions) have esterified structures that enhance compatibility with lipid-rich matrices and are authorized for direct food additive roles in specific categories. While glycerol esters are evaluated for properties such as emulsification and stability in food formulations, calcium salts of rosin derivatives are selected for adhesion and surface performance in materials. Similarly, partially hydrogenated rosin derivatives represent rosin modified through hydrogenation rather than dimerization, often resulting in different physical properties such as reduced unsaturation and altered melting points. These hydrogenated forms may be used in adhesives or coatings where resistance to oxidation is desired. The functional distinctions among these derivatives rest on their chemical modifications: hydrogenation targets unsaturated bonds, dimerization forms larger molecular units, and esterification incorporates additional organic moieties that influence solubility and interaction with other ingredients. From a regulatory perspective, each derivative’s authorized use — whether in direct additive roles or indirect contact applications — depends on safety evaluations that consider migration potential, toxicological data, and the context of use. While some related additives have defined acceptable daily intake values and direct food use conditions, surface-finishing agents like the calcium salt of partially dimerized rosin are regulated under indirect contact provisions with a focus on controlling exposure through good manufacturing practice rather than assigning an ADI. This comparison highlights how technical function and regulatory context influence how chemically related substances are evaluated and authorized for use in food-related applications.
Common Food Applications Narrative
In the context of food production and distribution, consumers encounter packaging and coatings in virtually every food category — from fresh produce to processed baked goods — that rely on advanced materials science to maintain quality, safety, and shelf life. Rosin, partially dimerized, calcium salt plays a behind-the-scenes role in this ecosystem as a surface-finishing agent incorporated into specific coatings, adhesives, and component materials used in food contact situations. For example, a fresh citrus fruit packaging manufacturer might use a surface finish that includes this ingredient to enhance the adhesion and durability of a thin coating applied to fruit boxes, ensuring protection from moisture and handling damage. Similarly, paperboard components intended for direct contact with dry foods such as crackers or snack bars may be coated with formulations that include this rosin derivative to achieve a uniform surface that resists oil penetration or mechanical abrasion. In another scenario, adhesives used in multilayer packaging structures — such as those found in beverage cartons or laminated wrappers — benefit from the improved bonding properties associated with modified rosin derivatives. These adhesive layers help maintain the structural integrity of the packaging, preventing delamination or weakening during transport and storage. It is important to emphasize that in all these applications, the role of rosin, partially dimerized, calcium salt is to support the technical performance of food contact materials, rather than to interact directly with the food in a way that contributes flavor, texture, or nutritional value. As food packaging systems become more complex, incorporating moisture barriers, grease-resistant layers, and printable surfaces, the selection of surface-finishing agents like this one ensures that each layer functions as intended while complying with regulatory requirements for food contact substances. By enhancing surface properties and adhesion, this ingredient indirectly supports the broader goals of food safety, packaging durability, and product quality, while remaining compliant with the conditions laid out in relevant regulatory frameworks for indirect food additives.
Safety & Regulations
FDA
- Notes: Listed in FDA indirect food additive inventories under specified CFR sections; direct approval status as a food additive is not established.
EFSA
- Notes: No specific EFSA evaluation for this compound identified; EFSA assessments exist for related rosin derivatives.
JECFA
- Notes: No specific JECFA evaluation found for this compound; general information about JECFA processes provided.
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