4-(p-hydroxyphenyl)-2-butanone

4-(p-hydroxyphenyl)-2-butanone, identified by CAS Number 5471-51-2, is an organic chemical compound belonging to the class of aromatic ketones. The compound contains a hydroxyphenyl group attached to a butanone backbone, giving it distinct chemical properties relevant to flavor chemistry. Its molecular structure allows it to interact with taste and olfactory receptors, which is the basis for its potential use as a flavoring agent.

This compound is primarily investigated for use as a flavoring agent or flavor adjuvant in the food industry. Flavor adjuvants are substances that enhance, modify, or complement the taste profile of food products. While the compound has potential applications in beverage flavoring, confectionery, and other processed foods, its actual market use appears limited due to regulatory restrictions. The compound may be found in research and development contexts within flavor chemistry, but widespread commercial application in food products is not documented.

According to FDA records, there have been zero reported adverse events associated with this additive and zero product recalls. This absence of reported incidents does not necessarily indicate comprehensive safety data, but rather reflects limited market exposure. The compound has not undergone the extensive safety evaluation required for FDA GRAS (Generally Recognized as Safe) designation. Without GRAS status or formal FDA approval, the additive cannot be legally added to food products in the United States.

Toxicological data on this specific compound appears limited in publicly available literature. Standard safety evaluations for flavoring agents typically include acute toxicity studies, genotoxicity assessments, and potential metabolic pathways. The phenolic structure of this compound suggests it may undergo hepatic metabolism, though specific metabolic studies would be necessary to confirm safety profiles.

In the United States, 4-(p-hydroxyphenyl)-2-butanone is not approved as a food additive by the FDA and does not have GRAS status. This means it cannot be legally added to food products marketed in the U.S. without prior FDA approval through the food additive petition process. The European Food Safety Authority (EFSA) has not listed this compound in its approved flavoring substances database, indicating it is similarly restricted or not evaluated in the European Union.

For an additive to gain GRAS status or FDA approval, manufacturers must submit comprehensive safety data demonstrating that the substance is safe under its intended conditions of use. This typically includes absorption, distribution, metabolism, and excretion (ADME) studies, as well as toxicological assessments.

Publicly available peer-reviewed research specifically on 4-(p-hydroxyphenyl)-2-butanone is limited. Most information regarding this compound comes from chemical databases and regulatory documentation rather than published safety studies. General research on aromatic ketone compounds and phenolic structures provides some context for understanding potential biochemical behavior, but compound-specific safety data would be necessary before regulatory approval could be considered.

The lack of substantial research data is a significant factor in the compound's non-approval status. Regulatory agencies require robust, independent studies demonstrating safety before approving new food additives. Without such data, the additive remains in a regulatory limbo—neither approved nor banned, but restricted from use in food products pending further evaluation.