[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR173.70]
[Page 129]
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
Subpart A Polymer Substances and Polymer Adjuvants for Food Treatment
Sec. 173.70 Chloromethylated aminated styrene-divinylbenzene resin.
Chloromethylated aminated styrene-divinylbenzene copolymer (CAS Reg.
No. 60177-39-1) may be safely used in food in accordance with the
following prescribed conditions:
(a) The additive is an aqueous dispersion of styrene-divinylbenzene
copolymers, first chloromethylated then aminated with trimethylamine,
having an average particle size of not more than 2.0 microns.
(b) The additive shall contain no more than 3.0 percent nonvolatile,
soluble extractives when tested as follows: One hundred grams of the
additive is centrifuged at 17,000 r/min for 2 hours. The resulting clear
supernatant is removed from the compacted solids and concentrated to
approximately 10 grams on a steam bath. The 10-gram sample is again
centrifuged at 17,000 r/min for 2 hours to remove any residual insoluble
material. The supernatant from the second centrifugation is then removed
from any compacted solids and dried to constant residual weight using a
steam bath. The percent nonvolatile solubles is obtained by dividing the
weight of the dried residue by the weight of the solids in the original
resin dispersion.
(c) The additive is used as a decolorizing and clarification agent
for treatment of refinery sugar liquors and juices at levels not to
exceed 500 parts of additive solids per million parts of sugar solids.
[50 FR 29209, July 18, 1985]
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