[Code of Federal Regulations]
[Title 21, Volume 2]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
PART 137_CEREAL FLOURS AND RELATED PRODUCTS--Table of Contents
Subpart B_Requirements for Specific Standardized Cereal Flours and
Sec. 137.350 Enriched rice.
(a) The foods for which definitions and standards of identity are
prescribed by this section are forms of milled rice (except rice coated
with talc and glucose and known as coated rice), to which nutrients have
been added so that each pound of the rice contains:
(1) Not less than 2.0 milligrams (mg) and not more than 4.0 mg of
thiamin, not less than 1.2 mg and not more than 2.4 mg of riboflavin,
not less than 16 mg and not more than 32 mg of niacin or niacinamide,
not less than 0.7 mg and not more than 1.4 mg of folic acid, and not
less than 13 mg and not more than 26 mg of iron (Fe).
(2) Each pound may contain not less than 250 U.S.P. units and not
more than 1,000 U.S.P. units of vitamin D.
(3) Each pound may contain not less than 500 milligrams and not more
than 1,000 milligrams of calcium (Ca). Calcium carbonate derived from
the use of this substance in milling rice, when present in quantities
that furnish less than 500 milligrams of calcium (Ca) per pound, is
considered a normal ingredient of the milled rice used and not an
optional ingredient of the enriched rice unless such enriched rice is
labeled to show it contains the optional ingredient calcium. Iron and
calcium may be added only in forms that are harmless and assimilable.
The vitamins referred to in paragraphs (a) (1) and (2) of this section
may be combined with harmless substances to render them insoluble in
water, if the water-insoluble products are assimilable.
(4) In the case of enriched parboiled rice, butylated hydroxytoluene
may be added as an optional ingredient in an amount not to exceed 0.0033
percent by weight of the finished food.
(b) The substances referred to in paragraphs (a) (1), (2), and (3)
of this section may be added in a harmless carrier. Such carrier is used
only in the quantity necessary to effect an intimate and uniform mixture
of such substances with the rice.
(c) Unless the label of the food bears the statement ``To retain
vitamins do not rinse before or drain after cooking'' immediately
preceding or following the name of the food and in letters not less than
one-fourth the point size of type used for printing the name of the food
(but in no case less than 8-point type) and the label bears no cooking
directions calling for washing or draining or unless the food is
precooked and it is packaged in consumer packages which are
conspicuously and prominently labeled with directions for preparation
which, if followed, will avoid washing away or draining off enriching
ingredients, the substances named in paragraphs (a) (1), (2), and (3) of
this section shall be present in such quantity or in such form that when
the enriched rice is washed as prescribed in paragraph (e) of this
section, the washed rice contains not less than 85 percent of the
minimum quantities of the substances
named in paragraph (a)(1) of this section, as required for enriched
rice; and in case any optional ingredients named in paragraphs (a) (2)
and (3) of this section are used, the washed rice also contains not less
than 85 percent of the minimum quantity specified for the substance or
(d) The name specified for each food for which a definition and
standard of identity is prescribed by this section is the common name of
the kind of milled rice to which the enriching substances are added,
preceded by the word ``enriched'' as, for example, ``Enriched rice'' or
``Enriched parboiled rice''.
(e) The method referred to in paragraph (c) of this section is as
follows: Mix the contents of one or more containers and transfer \1/2\
pound thereof to a 4-liter flask containing 2 liters of distilled water
at room temperature (but not below 20 [deg]C). Stopper the flask and
swirl it moderately for \1/2\ minute so that the rice is in motion and
in uniform suspension. Allow the rice to settle for \1/2\ minute, then
pour off 1,600 milliliters of the water, together with any floating and
suspended matter, and discard. To the contents of the flask, add 1,600
milliliters of distilled water and 20 milliliters of 10 N hydrochloric
acid. Agitate vigorously and wash down the sides of the flask with 150
milliliters of 0.1 N hydrochloric acid. In order to avoid excess foaming
during the extraction, heat the mixture slowly to about 100 [deg]C,
agitate if necessary, and maintain at this temperature until air is
expelled. Again wash down the sides of the flask with 150 milliliters of
0.1 N hydrochloric acid. Heat the mixture in an autoclave at 120 [deg]C
to 123 [deg]C for 30 minutes, remove and cool to room temperature.
Dilute the mixture with distilled water so that the total volume is
2,500 milliliters. Swirl the flask, and while the solids are in uniform
suspension pour off about 250 milliliters of the mixture for later
determination of iron (and calcium, if this is to be determined). With
filter paper that has been shown not to adsorb thiamine, riboflavin, or
niacin, filter enough of the remaining mixture for determination of
thiamine, riboflavin, and niacin. (In the case of a mixture difficult to
filter, centrifuging or filtering through fritted glass, or both, using
a suitable analytical filter-aid, may be substituted for, or may
precede, filtering through paper.) Dilute an aliquot of filtrate with
0.1 N hydrochloric acid, so that each milliliter contains about 0.2
microgram of thiamine, and determine thiamine by the ``Rapid
Fluorometric Method--Official Final Action,'' in section 43.034 of
``Official Methods of Analysis of the Association of Official Analytical
Chemists'' (AOAC), 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:
regulations/ibr--locations.html.With a suitable aliquot determine
riboflavin by the method prescribed in section 43.041(a) by the
``Fluorometric Method--Official Final Action,'' AOAC, 13th Ed. (1980),
beginning with the third sentence of the second paragraph, ``Adjust,
with vigorous agitation * * *.'' Determine niacin in a 200-milliliter
aliquot of the filtrate by the ``Colorimetric Method--Official Final
Action,'' in section 43.045, AOAC, 13th Ed. (1980), beginning with the
sixth sentence of the first paragraph, ``Adjust to pH 4.5 with * * *.''
Evaporate to dryness a 100-milliliter aliquot of the nonfiltered
material withdrawn while agitating, and determine iron using the method
``Iron--Official Final Action,'' in sections 14.011, 14.012, and 14.013,
AOAC, 13th Ed. (1980), and, if required, determine calcium as directed
in section 14.014 under the heading ``Calcium--Official Final Action,''
AOAC, 13th Ed. (1980).
(f) When the optional ingredient specified in paragraph (a)(4) of
this section is added, the statement ``Butylated hydroxytoluene added as
a preservative'' shall be placed on the label prominently and with such
conspicuousness (as compared with other words, statements, designs, or
devices in the label) as to render it likely to be read and understood
by the ordinary individual under customary conditions of purchase.
(g) Label declaration. Each of the ingredients used in the food
shall be declared on the label as required by the applicable sections of
parts 101 and 130 of this chapter.
Note: The Order of the Commissioner of Food and Drugs appearing at
23 FR 1170, Feb. 25, 1958, amending paragraphs (a)(1) and (c) provides
in part as follows: The regulations in Sec. 137.350 (formerly Sec.
15.525) are stayed insofar as they require each pound of the food to
contain not less than 1.2 milligrams and not more than 2.4 milligrams of
riboflavin. This stay shall continue until final action is taken
disposing of the objections, after public hearing thereon.
[42 FR 14402, Mar. 15, 1977, as amended at 47 FR 11828, Mar. 19, 1982;
49 FR 10098, Mar. 19, 1984; 54 FR 24894, June 12, 1989; 58 FR 2878, Jan.
6, 1993; 61 FR 8796, Mar 5, 1996]
Additives that reference this regulation: