[Code of Federal Regulations]
[Title 21, Volume 2]
[Revised as of April 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR137.211]
[Page 384-385]
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 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.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,
[[Page 385]]
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]
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