ROSIN, WOOD, GLYCEROL ESTER

CAS: 8050-30-4 SURFACE-FINISHING AGENT

Rosin, Wood, Glycerol Ester (CAS 8050-30-4) is a wood rosin derivative used in food applications as a surface-finishing agent and density/stabilizing agent.

What It Is

Rosin, Wood, Glycerol Ester is a chemically derived resinous additive obtained by reacting wood rosin with glycerol. It is identified by the CAS number 8050-30-4 and functions as a surface-finishing agent in specific food and beverage contexts. The substance may also be referred to by several alternative names such as wood rosin and glycerol ester of wood rosin, indicating its derivation from pine wood resin and its esterification with glycerol. In food applications it is most frequently encountered in formulations that require the stabilization of oils within aqueous matrices, particularly citrus oils in beverages. The esterified structure imparts properties that can help adjust density and maintain uniform dispersion of flavor oils. Its classification as a surface-finishing agent reflects its role in modifying how surfaces or dispersed phases behave in complex mixtures. Regulators such as the US Food and Drug Administration recognize this additive within specific food additive regulations, permitting use under defined conditions of good manufacturing practice.

How It Is Made

The production of Rosin, Wood, Glycerol Ester begins with refined wood rosin, typically derived from the solvent extraction of pine wood (often from aged pine stumps). This feedstock is reacted with food-grade glycerol under conditions that promote esterification, forming a variety of glycerol esters of the resin acids present in the rosin. Purification steps, such as countercurrent steam distillation or steam stripping, are applied to produce a beverage-grade or food-use-grade material that complies with regulatory and purity specifications. (联邦公报) The resulting material is a complex mixture of tri- and diglycerol esters of resin acids with a small fraction of monoesters and residual neutrals, reflecting the multi-component nature of wood resin. While methods and production specifics can vary by manufacturer, the overarching process links naturally sourced resin acids with glycerol through ester bonds to achieve the desired functional properties.

Why It Is Used In Food

This additive is primarily used in food and beverage formulations to adjust the density and stability of dispersed oils, especially citrus flavor oils in beverages. Its technical function as a surface-finishing agent aligns with its ability to improve dispersion and prevent phase separation in complex mixtures where oil and water phases coexist. This functionality is critical in certain beverages where uniform appearance and taste consistency are important. In addition to beverages, glycerol esters of wood rosin are used in chewing gum base compositions to modify texture and physical properties of the gum, functioning as a component in the structural matrix. Its use in these applications is driven by its compatibility with lipophilic components, its ability to modify physical characteristics such as density and mouthfeel, and its established regulatory acceptance under specified conditions.

Adi Example Calculation

To illustrate how an ADI might be contextualized, consider a hypothetical ADI of 25 mg per kilogram of body weight per day (this example is illustrative and not a regulatory approval statement). For an adult weighing 70 kg, the corresponding daily intake would be 70 kg times 25 mg/kg, yielding 1750 mg per day under that ADI. It is important to emphasize that this calculation is illustrative and not a personal recommendation; actual intake levels for specific populations are typically far lower based on typical food additive use levels and consumption patterns. (世界卫生组织应用

Safety And Health Research

Safety evaluations for glycerol esters of wood rosin have been conducted by expert bodies including JECFA and the European Food Safety Authority (EFSA). These assessments focus on toxicological data, exposure estimates, and the composition of the additive. Re-evaluations consider available study data, including long-term feeding studies, as part of hazard identification and characterization. (世界卫生组织应用) Regulatory bodies assess endpoints such as general systemic toxicity and compositional consistency of food-grade material. Where data gaps exist, panels may apply temporary safety benchmarks or request further data, reflecting cautious regulatory approaches. This ongoing evaluation process ensures that the use of the additive remains aligned with current scientific understanding and safety standards.

Regulatory Status Worldwide

In the United States, glycerol esters of wood rosin are recognized within Title 21 of the Code of Federal Regulations; for example, 21 CFR 172.735 specifically authorizes the use of glycerol ester of rosin under defined conditions in food products such as beverages, subject to good manufacturing practice and prescribed purity criteria. In international contexts, food additive specifications and evaluations have been undertaken through the FAO/WHO Joint Expert Committee on Food Additives (JECFA). The additive is associated with the INS number 445 in international systems, indicating its classification among approved emulsifiers and stabilizing agents. Regulatory frameworks in other regions like the European Union have also addressed glycerol esters of wood rosin (often referenced by the E number E445) with detailed re-evaluation of safety and specifications for its use, particularly focusing on compositional criteria and exposure assessments. (EFSA Online Library

Taste And Functional Properties

Rosin, Wood, Glycerol Ester is not used for flavoring but for functional purposes. It generally has a mild, non-aromatic character as a complex resinous ester mixture. It is nearly insoluble in water but soluble in organic solvents and oils, which underpins its role in stabilizing oil-in-water dispersions. The ester gum structure contributes to its ability to adjust density and influence the mouthfeel of chewing gum base components. Its performance is influenced by temperature and formulation, with processing considerations such as heat and shear affecting how it interacts with other ingredients. Because it is not a direct flavoring agent, its sensory impact is primarily related to physical stability and texture rather than taste. Functionally, it can help maintain uniformity in beverages and chewing gum, assisting in suspension of flavor oils and contributing to overall product stability.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept representing the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on toxicological data and safety factors. For additives such as glycerol esters of wood rosin, expert committees review available data to establish an ADI or temporary guidance range. These values provide a margin of safety for consumers, ensuring that typical dietary exposures through permitted uses remain well below levels of concern identified in studies. (世界卫生组织应用) ADI values are not recommendations for consumption but tools for risk management, derived from observed data and adjusted with uncertainty factors to account for variability in human populations.

Comparison With Similar Additives

Glycerol esters of wood rosin share functional similarity with other weighting and stabilizing agents such as brominated vegetable oil (BVO) and sucrose esters of fatty acids, which are also used to maintain uniform dispersion of hydrophobic flavor components in emulsified beverages. In contrast to BVO, which incorporates bromine atoms and has unique regulatory histories in different regions, glycerol ester of wood rosin is derived from natural resin acids and glycerol. Sucrose esters of fatty acids, on the other hand, are carbohydrate-derived emulsifiers used broadly for texture modification and stabilization in foods. The choice between these and other stabilizers depends on formulation requirements, regulatory acceptance, and desired functional outcomes in specific products.

Common Food Applications Narrative

Rosin, Wood, Glycerol Ester finds use across a range of products where oil dispersion and stability are technologically necessary. One of its most well-established roles is in citrus-flavored beverages, where it helps weigh down citrus oils so that they remain evenly dispersed rather than separating out; this is particularly important in cloudy and citrus beverages where phase separation is visually undesirable and could affect consumer acceptance. In the formulation of certain chewing gum bases, the additive contributes to the texture by blending with other gum components and modifying physical properties for manufacturability and sensory quality. Beyond these uses, it may also appear in other beverage and confectionery products that require stabilization of hydrophobic flavor components in aqueous systems. Its inclusion supports formulation consistency, shelf stability, and product quality in categories where dispersed oils or resins are integral to flavor and appearance.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.735

EFSA

  • Notes: Temporary ADI values vary; specific numeric value not conclusively stated in search results
  • Approved: True
  • E Number: E445

JECFA

  • Notes: JECFA established an ADI range but specific numeric year not verified
  • Ins Number: 445
  • Adi Display: 0-25 mg/kg bw

Sources

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