[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: 21CFR173.40]
[Page 126]
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. 173.40 Molecular sieve resins.
Molecular sieve resins may be safely used in the processing of food
under the following prescribed conditions:
(a) The molecular sieve resins consist of purified dextran having an
average molecular weight of 40,000, cross-linked with epichlorohydrin in
a ratio of 1 part of dextran to 10 parts of epichlorohydrin, to give a
stable three dimensional structure. The resins have a pore size of 2.0
to 3.0 milliliters per gram of dry resin (expressed in terms of water
regain), and a particle size of 10 to 300 microns.
(b) The molecular sieve resins are thoroughly washed with potable
water prior to their first use in contact with food.
(c) Molecular sieve resins are used as the gel filtration media in
the final purification of partially delactosed whey. The gel bed shall
be maintained in a sanitary manner in accordance with good manufacturing
practice so as to prevent microbial build-up on the bed and adulteration
of the product.
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