[Code of Federal Regulations]
[Title 21, Volume 2]
[Revised as of April 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR137.211]

[Page 378]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 137--CEREAL FLOURS AND RELATED PRODUCTS--Table of Contents
 
  Subpart B--Requirements for Specific Standardized Cereal Flours and 
                            Related Products
 
Sec. 137.211  White corn flour.

    (a) White corn flour is the food prepared by so grinding and bolting 
cleaned white corn that when tested by the method prescribed in 
paragraph (b)(2) of this section, not less than 98 percent passes 
through a No. 50 sieve and not less than 50 percent passes through No. 
70 woven-wire cloth. Its moisture content is not more than 15 percent. 
In its preparation, part of the ground corn may be removed, but in any 
such case, the content (on a moisture-free basis) of neither the crude 
fiber nor fat in the finished white corn flour exceeds the content (on a 
moisture-free basis) of such substance in the cleaned corn from which it 
was ground.
    (b)(1) For the purpose of this section, moisture, fat, and crude 
fiber are determined by methods therefore referred to in 
Sec. 137.250(b)(1).
    (2) The method referred to in paragraph (a) of this section is as 
follows: Weigh 5 grams of sample into a tared truncated metal cone (top 
diameter 5 centimeters, bottom diameter 2 centimeters, height 4 
centimeters), fitted at bottom with 70-mesh wire cloth complying with 
the specifications for No. 70 wire cloth in ``Official Methods of 
Analysis of the Association of Official Analytical Chemists,'' 13th Ed. 
(1980), Table 1, ``Nominal Dimensions of Standard Test Sieves (U.S.A. 
Standard Series),'' under the heading ``Definitions of Terms and 
Explanatory Notes,'' 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. Attach cone to 
a suction flask. Wash with 150 ml. of petroleum ether applied in a small 
stream without suction, while gently stirring the sample with a small 
glass rod. Apply suction for 2 minutes after washing is completed, then 
shake the cone for 2 minutes with a vigorous horizontal motion, striking 
the side against the hand, and then weigh. The decrease in weight of 
sample, calculated as percent by weight of sample shall be considered 
the percent passing through No. 70 wire cloth. Transfer the residue from 
cone to a No. 50 sieve having a standard 20.3 centimeter (8-inch) 
diameter full-height frame, complying with the specifications for wire 
cloth and sieve frame in ``Nominal Dimensions of Standard Test Sieves 
(U.S.A. Standard Series).'' Shake for 2 minutes with a vigorous 
horizontal motion, striking the side against the hand; remove and weigh 
the residue; calculate the weight of residue as percent by weight of 
sample, and subtract from 100 percent to obtain the percent of sample 
passing through the No. 50 sieve.

[42 FR 14402, Mar. 15, 1977, as amended at 47 FR 11827, Mar. 19, 1982; 
49 FR 10098, Mar. 19, 1984; 54 FR 24894, June 12, 1989]