THIODIPROPIONIC ACID

CAS: 111-17-1 ANTIOXIDANT

THIODIPROPIONIC ACID (CAS 111-17-1) is an antioxidant compound used to inhibit oxidation and maintain stability in various materials and formulations including food-related applications.

What It Is

THIODIPROPIONIC ACID is a synthetic antioxidant compound characterized chemically as an organosulfur dicarboxylic acid and identified by CAS number 111-17-1. It is known by several synonyms reflecting its chemical structure and functional characteristics, and in international food additive systems it is recognized under the International Numbering System for Food Additives (INS 388) as an antioxidant class compound used to slow oxidative degradation in fats and oils. As an antioxidant, it functions by interfering with the chain reactions of oxidation that lead to rancidity, helping to preserve product quality over time. This compound presents as a white to off-white crystalline powder with polar functional groups that confer moderate solubility in water and other polar solvents. Its structure includes sulfur-linked propionic acid units that allow it to interact with reactive species and reduce oxidation, similar in principle to other food antioxidants that stabilize fats and oils. The antioxidant classification situates THIODIPROPIONIC ACID within a group of additives that are used primarily to maintain stability during processing and storage, rather than to contribute flavor or nutritional value. Because of its organosulfur nature and reactivity, use of this compound in food formulations and packaging systems requires regulatory consideration and specification to ensure that it provides technological benefit without raising undue safety concerns.

How It Is Made

The industrial production of THIODIPROPIONIC ACID typically involves chemical synthesis routes that assemble its organosulfur framework from simpler building blocks. One general approach involves oxidative coupling of mercaptopropionic acid derivatives under controlled basic conditions to form the thioether linkage that defines the molecule. Alternative synthetic routes may employ sulfur coupling agents coupled with controlled acidification, producing the desired dicarboxylic acid structure. Following synthesis, purification steps such as crystallization from aqueous media are employed to achieve high purity material suitable for antioxidant applications. The crystalline product often exhibits well-defined melting characteristics and modest solubility in water and organic solvents. These quality attributes support its use in formulations where consistent performance is needed, including incorporation into packaging materials or directly into food formulations that contain fats or oils. The manufacturing process aims to minimize impurities and byproducts that might arise during coupling and oxidation steps. Quality control measures in chemical synthesis include analytical verification of identity, purity, and functional performance, ensuring the final product meets established specifications before use in food-related technology applications.

Why It Is Used In Food

THIODIPROPIONIC ACID is used in food-related applications primarily for its antioxidant function, which helps slow the oxidative degradation of fats and oils. Oxidation in lipid-rich ingredients leads to rancidity, off-flavors, and reduced shelf life, and antioxidants like THIODIPROPIONIC ACID provide technological benefit by interrupting oxidation chain reactions. These antioxidant characteristics support extended stability of food products and packaging systems where lipid oxidation is a concern. Food formulators may choose to incorporate THIODIPROPIONIC ACID in contexts where fat-containing ingredients are prone to deterioration under processing or storage conditions. Its functional role complements other preservation strategies and can work in synergy with packaging technologies to protect quality. In addition to direct use, it may also be applied in food packaging materials to prevent oxidative changes in foods during shelf life, helping maintain product integrity and sensory attributes. The selection of THIODIPROPIONIC ACID over other antioxidants depends on criteria such as effectiveness, compatibility with other ingredients, and regulatory permissions for specific food applications. Because oxidative stability is crucial in many processed foods, having a range of antioxidant options allows food technologists to tailor solutions to the specific needs of a formulation or packaging system.

Adi Example Calculation

To illustrate how an ADI range might be interpreted, consider an ADI upper bound established by a scientific body such as JECFA. If the upper bound of the acceptable intake range is defined in milligrams per kilogram of body weight per day, a hypothetical calculation demonstrates how this translates to total daily intake for an individual. For example, a person weighing 70 kilograms would multiply the ADI value by their body weight to determine the maximum amount considered safe for daily intake. This calculation is intended purely as an example and does not reflect personal health advice. Such illustrative exercises help contextualize regulatory values in practical terms, showing how body weight relates to allowable intake limits. Regulatory exposure assessments consider typical consumption patterns and additive levels in foods to estimate whether real-world exposures are likely to remain within safe boundaries. Understanding the relationship between ADI values and everyday intake supports informed decisions by formulators, regulators, and public health professionals.

Safety And Health Research

Safety and health research on THIODIPROPIONIC ACID focuses on understanding its toxicological profile and the potential for adverse effects at various exposure levels. Regulatory bodies and scientific committees evaluate data from animal studies, including acute and chronic toxicity assessments, to determine whether use in food-related applications presents acceptable risk. These evaluations generally consider endpoints such as organ toxicity, carcinogenicity, reproductive effects, and metabolism, although the specific data available for this compound may be limited. JECFA’s historical evaluation of THIODIPROPIONIC ACID includes consideration of toxicological evidence and derivation of acceptable intake ranges based on available studies. This type of assessment informs the establishment of safety boundaries and specifications that guide regulatory permissions. Researchers also examine how the compound behaves in biological systems, including absorption, distribution, metabolism, and elimination, helping clarify whether residues in foods could pose health concerns. The scientific process of safety evaluation involves peer-reviewed studies and regulatory review panels that synthesize evidence to inform guidelines and permissible uses. While some data may be decades old, these evaluations serve as a foundation for ongoing monitoring and potential re-evaluation as new research emerges, supporting the ongoing assurance of consumer safety.

Regulatory Status Worldwide

In the United States, THIODIPROPIONIC ACID is recognized in the Code of Federal Regulations under sections pertaining to indirect food additives and food contact substances. The listing of this compound in 21 CFR Parts 175.300, 177.1010, 178.2010, 181.24, and 182.3109 indicates its authorization for specified food contact uses, such as in packaging materials and related applications. These listings reflect regulatory acceptance of defined uses rather than a blanket approval for all food additive applications. Internationally, THIODIPROPIONIC ACID has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which assigned it an International Numbering System (INS) designation of 388 and evaluated its safety as an antioxidant in food applications. JECFA’s assessment includes specifications for identity and purity to support safe use in permitted contexts. Such evaluations contribute to harmonized understanding of its regulatory status in various regions, though specific national regulations may differ. Regulatory frameworks encourage careful specification of conditions under which THIODIPROPIONIC ACID may be used, aligning with scientific evaluations of technological need and safety. Stakeholders in the food industry must adhere to the relevant regulatory codes and conditions of use established by authorities in their markets to ensure compliance and consumer protection.

Taste And Functional Properties

THIODIPROPIONIC ACID itself is not typically described in terms of imparting a distinct taste in food applications, as its functional role as an antioxidant is not intended to contribute sensory flavor. In formulations where it is used to protect fats and oils, its presence at regulated levels generally does not alter the taste profile of the finished product, focusing instead on preserving the intended sensory quality by preventing oxidation-related off-flavors. Functionally, the compound exhibits moderate solubility in water and other polar solvents owing to its dicarboxylic acid groups. The sulfur linkage within its structure contributes to its reactivity with oxidation intermediates, enabling it to act as a chain-breaking antioxidant. These properties influence how it interacts with formulation components and how it can be incorporated into food systems or packaging materials. Temperature and pH conditions of the food matrix can affect the stability and performance of THIODIPROPIONIC ACID, as is the case with many antioxidants. Understanding its behavior under typical processing and storage conditions helps formulators optimize its use. While it does not provide a sensory contribution, its role in functional performance supports quality retention in products where oxidation could otherwise compromise taste and texture.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) represents an estimate of the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on existing toxicological data and safety factors. For additives like THIODIPROPIONIC ACID that have been evaluated by expert bodies such as JECFA, an ADI range may be established to guide regulatory conditions of use and exposure assessment. This range reflects the upper boundary of intake considered safe, incorporating conservative assumptions to protect sensitive populations. It is important to understand that an ADI is not a nutritional recommendation or a target for consumption, but rather a safety benchmark used by regulators and industry to assess whether typical dietary exposures remain within acceptable limits. When intake from all sources stays below the upper bound of an established ADI, the additive’s use is considered to pose low risk under approved conditions. In regulatory practice, compliance with conditions of use and adherence to specifications ensure that actual exposure levels are unlikely to approach or exceed the ADI. Safety evaluations and ADI values are periodically reviewed in light of new scientific data to maintain alignment with current understanding of toxicology and public health protection.

Comparison With Similar Additives

THIODIPROPIONIC ACID can be compared with other antioxidant additives that serve similar functions in food systems, such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). Like THIODIPROPIONIC ACID, BHA and BHT are used to prevent lipid oxidation and help maintain quality in products containing fats and oils. Differences among these antioxidants include chemical structure, solubility, and regulatory status in specific markets, which influence how formulators select them for particular applications. Another antioxidant commonly used in foods is propyl gallate, which functions by donating hydrogen atoms to free radicals, interrupting oxidation chain reactions. While THIODIPROPIONIC ACID shares the functional purpose of stabilizing fats and oils, each antioxidant has distinct performance characteristics and regulatory conditions that affect their choice in formulation strategies. Comparative understanding allows food scientists to balance effectiveness, regulatory compliance, and compatibility with other ingredients, selecting the most appropriate antioxidant or combination of antioxidants for the desired product profile.

Common Food Applications Narrative

In the landscape of food technology, antioxidants play a critical role in maintaining the quality of products that contain fats and oils. THIODIPROPIONIC ACID is one of the antioxidant compounds that food technologists may consider when oxidative stability is a priority. Products such as oil-based dressings, margarine-like spreads, and confectionery items with significant lipid content benefit from formulation strategies that mitigate oxidation. By providing antioxidant protection, THIODIPROPIONIC ACID helps these items retain their intended flavor and texture throughout shelf life. Furthermore, processed snack foods and bakery products that incorporate fats are also susceptible to oxidative changes, especially when stored for extended periods. In these contexts, antioxidants such as THIODIPROPIONIC ACID contribute to quality assurance by slowing the onset of rancidity, which can otherwise manifest as undesirable tastes and aromas. Similarly, ready-to-use sauces and emulsions that include oils require protection against oxidative degradation to ensure consistent sensory characteristics for consumers. Food packaging materials designed to directly contact fat-containing products may also incorporate antioxidant functionality to enhance preservation. Whether integrated into films, trays, or coating systems, the antioxidant activity of THIODIPROPIONIC ACID serves to reduce the oxidative burden on packaged foods. In these ways, the compound supports multi-faceted applications where maintaining stability and extending usable life are operational objectives for food manufacturers.

Safety & Regulations

FDA

  • Notes: Included in US FDA food contact substance listings for specified uses but direct additive approval status for general food use is not confirmed.

EFSA

  • Notes: EFSA specific evaluation and E-number status not found in authoritative sources.

JECFA

  • Year: 1973
  • Notes: ADI range and evaluation year derived from JECFA database entry.
  • Ins Number: 388
  • Adi Display: 0-3 mg/kg bw

Sources

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