[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR189.190]

[Page 567-568]
 
                        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 B--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),

[[Page 568]]

which is incorporated by reference. Copies may be obtained from the 
Association of Official Analytical Chemists International, 481 North 
Frederick Ave., suite 500, Gaithersburg, MD 20877-2504, or may be 
examined at the Office of the Federal Register, 800 North Capitol 
Street, NW., suite 700, Washington, DC 20408.

[42 FR 14659, Mar. 15, 1977, as amended at 49 FR 10114, Mar. 19, 1984; 
54 FR 24900, June 12, 1989]