§ 173.45 Polymaleic acid and its sodium salt.
Polymaleic acid （CAS Reg. No. 26099–09–2） and its sodium salt （CAS Reg. No. 70247–90–4） may be safely used in food in accordance with the following prescribed conditions:
（a） The additives have a weight-average molecular weight in the range of 540 to 850 and a number-average molecular weight in the range of 520 to 650, calculated as the acid. Molecular weights shall be determined by a method entitled “Determination of Molecular Weight Distribution of Poly（Maleic） Acid,” March 17, 1992, produced by Ciba-Geigy, Inc., Seven Skyline Dr., Hawthorne, NY 10532–2188, which is incorporated by reference in accordance with 5 U.S.C. 552（a） and 1 CFR part 51. Copies are available from the Division of Product Policy, Center for Food Safety and Applied Nutrition （HFS–205）, Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740, or are available for inspection at the Center for Food Safety and Applied Nutrition's Library, 5100 Paint Branch Pkwy., College Park, MD 20740, or 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.
（b） The additives may be used, inpidually or together, in the processing of beet sugar juice and liquor or of cane sugar juice and liquor to control mineral scale.
（c） The additives are to be used so that the amount of either or both additives does not exceed 4 parts per million （calculated as the acid） by weight of the beet or cane sugar juice or liquor process stream.
[51 FR 5315, Feb. 13, 1986, as amended at 61 FR 386, Jan. 5, 1996]
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