[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR173.65]
[Page 127-128]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 173_SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN
CONSUMPTION--Table of Contents
Subpart A_Polymer Substances and Polymer Adjuvants for Food Treatment
Sec. 173.65 Divinylbenzene copolymer.
Divinylbenzene copolymer may be used for the removal of organic
substances from aqueous foods under the following prescribed conditions:
(a) The copolymer is prepared in appropriate physical form and is
derived by the polymerization of a grade of divinylbenzene which
comprises at least 79 weight-percent divinylbenzene, 15 to 20 weight-
percent ethyl vinyl benzene, and no more than 4 weight-percent
nonpolymerizable impurities.
(b) In accordance with the manufacturer's directions, the copolymer
described in paragraph (a) of this section is subjected to pre-use
extraction with a water soluble alcohol until the level
[[Page 128]]
of divinylbenzene in the extract is less than 50 parts per billion as
determined by a method titled, ``The Determination of Divinylbenzene in
Alcohol Extracts of Amberlite XAD-4,'' which is incorporated by
reference. Copies of this method are available from the Center for Food
Safety and Applied Nutrition (HFS-200), Food and Drug Administration,
5100 Paint Branch Pkwy., College Park, MD 20740, or available for
inspection 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. The copolymer is then treated
with water according to the manufacturer's recommendation to remove the
extraction solvent to guarantee a food-grade purity of the resin at the
time of use, in accordance with current good manufacturing practice.
(c) The temperature of the aqueous food stream contacting the
polymer is maintained at 79.4 [deg]C (175 [deg]F) or less.
(d) The copolymer may be used in contact with food only of Types I,
II, and VI-B (excluding carbonated beverages) described in table 1 of
paragraph (c) of Sec. 176.170 of this chapter.
[50 FR 61, Jan. 2, 1985]
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