---
kind: "section"
citation: "21 C.F.R. § 172.185"
title: "21"
number: "172.185"
heading: "TBHQ."
url: "https://uscodex.org/cfr/21/172.185"
---

# §172.185. TBHQ.


The food additive TBHQ, which is the chemical 2-(1,1-dimethylethyl)-1,4-benzenediol (Chemical Abstracts Service Registry Number 1948-33-0), also known as tertiary butylhydroquinone, may be safely used in food in accordance with the following prescribed conditions:

- (a) The food additive has a melting point of not less than 126.5 °C.
- (b) The percentage of TBHQ in the food additive is not less than 99.0 percent when tested by the assay described in the Food Chemicals Codex, 9th ed. (2014), pp. 1192-1194, which is incorporated by reference, or an equivalent method. The Director of the Office of the Federal Register approves this incorporation by reference in accordance with 5 U.S.C. [552(a)](/usc/5/552.md?p=a) and [1](/usc/5/1.md) CFR [part 51](/cfr/21/part51.md). You may obtain copies from the United States Pharmacopeial Convention, 12601 Twinbrook Pkwy., Rockville, MD 20852 (Internet address: http://www.usp.org). Copies may be examined at the Dockets Management Staff (HFA-305), Food and Drug Administration, 5630 Fishers Lane, Rm. 1061, Rockville, MD 20852, 240-402-7500, between 9 a.m. and 4 p.m., Monday through Friday, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030 or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.
- (c) **It is used as an antioxidant alone or in combination with BHA and/or BHT.**
- (d) The total antioxidant content of a food containing the additive will not exceed 0.02 percent of the oil or fat content of the food, including the essential (volatile) oil content of the food.

## Notes

### Amendments

[42 FR 14491, Mar. 15, 1977, as amended at 80 FR 34276, June 16, 2015; 88 FR 17719, Mar. 24, 2023]

### Authority

Authority: 21 U.S.C. 321, 341, 342, 348, 371, 379e.

### Source

Source: 42 FR 14491, Mar. 15, 1977, unless otherwise noted.

### Amendments

[42 FR 14491, Mar. 15, 1977, as amended at 80 FR 34276, June 16, 2015; 88 FR 17719, Mar. 24, 2023]