[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR189.190]
[Page 596-597]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 189 SUBSTANCES PROHIBITED FROM USE IN HUMAN FOOD--Table of Contents
Subpart C Substances Generally Prohibited From Direct Addition or Use as
Human Food
Sec. 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.
[[Page 597]]
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]
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