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Code of Federal Regulations (Last Updated: October 10, 2024) |
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Title 21 - Food and Drugs |
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Chapter I - Food and Drug Administration, Department of Health and Human Services |
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SubChapter B - Food for Human Consumption |
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Part 189 - Substances Prohibited from Use in Human Food |
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Subpart C - Substances Generally Prohibited From Direct Addition or Use as Human Food |
§ 189.190 - Thiourea.
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§ 189.190 Thiourea.
(a) Thiourea is the chemical thiocarbamide, CH4N2S. It is a synthetic chemical, is not found in natural products at levels detectable by the official methodology, and has been proposed as an antimycotic for use in dipping citrus.
(b) Food containing any added or detectable level of thiourea is deemed to be adulterated under the act.
(c) The analytical methods used for detecting thiourea are in sections 20.115-20.126 of the “Official Methods of Analysis of the Association of Official Analytical Chemists,” 13th Ed. (1980), which is incorporated by reference. Copies may be obtained from the AOAC INTERNATIONAL, 481 North Frederick Ave., suite 500, Gaithersburg, MD 20877, or may be examined 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/code_of_federal_regulations/ibr_locations.html.
[42 FR 14659, Mar. 15, 1977, as amended at 49 FR 10114, Mar. 19, 1984; 54 FR 24900, June 12, 1989]