2,4,5-TRIHYDROXYBUTYROPHENONE
2,4,5-Trihydroxybutyrophenone is an organic antioxidant compound used in food to delay oxidation of fats and oils under specified regulatory conditions.
What It Is
2,4,5-Trihydroxybutyrophenone is an antioxidant food additive defined by the CAS number 1421-63-2 and described in U.S. food additive regulations as THBP. It is a small aromatic ketone with three phenolic hydroxyl groups attached to a butyrophenone backbone. In regulatory language, it is permitted as an antioxidant alone or in combination with other antioxidants under prescribed conditions. The multiple hydroxyl groups in the aromatic ring confer antioxidant properties by helping terminate oxidative free radical chain reactions in fats and oils, which can otherwise lead to rancidity and off-flavors. Its chemical role is primarily technological, preventing oxidative degradation in food matrices that contain fats and oils. The compound is solid at room temperature with typical melting characteristics noted in safety and regulatory texts. The name may also appear under several synonyms reflecting its chemical structure.
How It Is Made
2,4,5-Trihydroxybutyrophenone is synthesized through classical organic chemical reactions starting from substituted phenolic precursors and butyrophenone intermediates. Typical preparative approaches involve electrophilic substitution to install hydroxyl groups on a phenyl ring followed by ketone formation at the butyrophenone position. These approaches yield a crystalline compound that can be purified by recrystallization. In a manufacturing context, the identity, purity, and physical properties such as melting range and solubility are established to ensure consistent performance as an antioxidant. Production adheres to good manufacturing practice, and chemical intermediates are handled under controlled conditions with appropriate safety measures. Industrial production typically occurs in chemical manufacturing facilities licensed to produce certified analytical standards and food-grade antioxidant compounds.
Why It Is Used In Food
The primary reason for using 2,4,5-Trihydroxybutyrophenone in food is its antioxidant function. Antioxidants in food serve to slow down the oxidation of fats and oils, which can result in unpleasant tastes, odors, and reduced shelf life. Oxidative reactions involve free radicals and reactive oxygen species attacking unsaturated bonds in lipid molecules, leading to rancidity. By donating hydrogen atoms or electrons from its phenolic groups, 2,4,5-Trihydroxybutyrophenone helps neutralize reactive species and terminate chain reactions. This function is especially valuable in foods high in unsaturated fats, such as certain oils, spreads, and processed foods subject to oxidation during storage. Its use is restricted to prescribed levels so that the total antioxidant content of the food does not exceed the regulatory limit relative to the fat content, ensuring it performs the intended technological role without exceeding safety specifications.
Adi Example Calculation
Because there is no specific ADI value confirmed for 2,4,5-Trihydroxybutyrophenone in authoritative regulatory databases, a hypothetical calculation cannot be performed without speculating on numeric values. Instead, an illustrative example for a generic antioxidant with a hypothetical ADI might show how a regulatory ADI is used: for a hypothetical ADI of X mg per kilogram of body weight per day, a 70 kg person’s allowable intake would be X * 70 mg per day, illustrating how body weight scales regulatory exposure limits. In the absence of a verified ADI, the safe approach is to adhere strictly to regulatory use conditions such as maximum antioxidant content in fat-containing foods.
Safety And Health Research
Safety and health research on antioxidants like 2,4,5-Trihydroxybutyrophenone focuses on understanding potential toxicological endpoints such as general toxicity, genotoxicity, and effects at high exposure levels. Regulatory evaluations typically review studies addressing these endpoints before authorizing a substance for food use. In the case of 2,4,5-Trihydroxybutyrophenone, the available evidence primarily comes from chemical databases and regulatory listings indicating its industrial antioxidant role and regulatory conditions under U.S. law. Toxicity data that might include acute exposure metrics, such as LD50 via certain routes of administration, are documented in chemical safety resources for hazard classification. However, systematic human dietary exposure studies or formal evaluations by WHO JECFA or EFSA specific to this additive could not be confirmed in available authoritative sources. As such, regulatory allowances and safety evaluations reflect assessed technological necessity and controlled use rather than broad health outcome claims, and any narrative about health effects must be understood in the context of regulatory assessments rather than clinical endpoints.
Regulatory Status Worldwide
In the United States, 2,4,5-Trihydroxybutyrophenone is specifically permitted as a food additive antioxidant under Title 21 of the Code of Federal Regulations, Section 172.190. The regulation states that the additive may be safely used as an antioxidant alone or with other permitted antioxidants, and that the total antioxidant content of a food containing this additive must not exceed a specified proportion of the oil or fat content of the food. This regulatory citation reflects direct authorization for its use with defined conditions. It is also listed in the FDA inventory of food contact substances with related parts of the regulations, indicating its presence in multiple regulatory contexts. In the European Union, there is no clear evidence that an E number has been assigned for this substance, and searches of the EU food additive database did not return a match, indicating that it may not be authorized as a food additive in that jurisdiction. For JECFA (the FAO/WHO expert committee on food additives), while the database confirms that the committee evaluates many additives, specific monographs for this compound could not be located in the searchable summaries, so its global status under Codex Alimentarius is uncertain.
Taste And Functional Properties
As an aromatic ketone with multiple phenolic hydroxyl groups, 2,4,5-Trihydroxybutyrophenone itself does not act primarily as a flavoring agent and is selected for its functional antioxidant properties. Phenolic antioxidants exert their effect by interrupting oxidative chain reactions rather than through imparting distinct sensory attributes; in practical terms, they help preserve the natural taste and aroma of food by preventing off-flavors associated with oxidation. Its solubility profile reflects moderate solubility in organic solvents and limited solubility in water, aligning with its role in lipid-rich environments. Heat and pH stability are relevant to performance, and its antioxidant effectiveness tends to be context-specific: it is most useful where oxidative stresses are likely during processing or storage. Sensory impact is minimal at legally permitted levels, and formulation scientists typically balance its activity with other antioxidants to meet both performance and regulatory criteria.
Acceptable Daily Intake Explained
The concept of an acceptable daily intake (ADI) is a regulatory benchmark indicating the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, often derived from toxicological studies and applying safety factors. For 2,4,5-Trihydroxybutyrophenone, no specific numeric ADI has been established in authoritative JECFA or EFSA public records accessible through standard regulatory databases. Therefore, rather than stating a numeric ADI, it is appropriate to explain that regulatory frameworks rely on detailed evaluations of toxicological data, and use limits in food formulations to ensure exposures remain within safe bounds as understood by risk assessors. When a substance is listed in food additive regulations such as 21 CFR 172.190, the conditions of safe use implicitly account for safety data reviewed by regulators. In general, ADI values are derived by identifying a no-observed-adverse-effect level (NOAEL) from studies and applying uncertainty factors to ensure a wide margin of safety.
Comparison With Similar Additives
2,4,5-Trihydroxybutyrophenone belongs to a class of phenolic antioxidants similar in function to more commonly used additives such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). All these compounds stabilize fats and oils against oxidative degradation by interrupting free radical chains. BHA and BHT have well-documented regulatory frameworks, including specific usage limits and health evaluations, whereas 2,4,5-Trihydroxybutyrophenone’s authorization and use are more narrowly defined in the U.S. regulation 21 CFR 172.190. Another related antioxidant is propyl gallate, which also prevents oxidation but differs chemically and has its own regulatory specifications. Comparing these compounds highlights how different antioxidants achieve similar technological goals yet have distinct regulatory statuses and approval histories across jurisdictions.
Common Food Applications Narrative
In commercial food production, antioxidants play a crucial role in maintaining food quality by extending the shelf life of products that contain fats and oils. 2,4,5-Trihydroxybutyrophenone is one such antioxidant that has found applications in food systems where oxidative stability is a concern. Foods such as oil-based spreads, processed snacks, certain baked goods, and ready-to-eat products with significant lipid content can benefit from antioxidant protection. When fats and oils oxidize, sensory qualities such as aroma and taste deteriorate, which can lead to reduced consumer acceptance. By incorporating antioxidants like 2,4,5-Trihydroxybutyrophenone within regulated limits, manufacturers aim to preserve the intended sensory profile of foods over time. Its use is governed by regulatory specifications that dictate maximum allowable antioxidant content relative to fat content in the food. When used according to these conditions, it contributes to maintaining freshness and delaying rancidity in products with extended shelf lives.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 172.190
EFSA
- Notes: No evidence of an EFSA evaluation or E number in the EU additive database.
JECFA
- Notes: No specific JECFA evaluation or ADI identified in available JECFA databases.
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