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更多关于已证实属于一般公认为安全（GRAS）的可直接加入食品中的物质种类，请点出a href="//www.sqrdapp.com/law/dongtai/172262.html">美国FDA 21 CFR ?84部分已证实属于一般公认为安全（GRAS）的可直接加入食品中的物质种类汇怺/font>
184.1431 Magnesium oxide.
（a Magnesium oxide （MgO, CAS Reg. No. 1309C48C4 occurs naturally as the colorless, crystalline mineral periclase. It is produced either as a bulky white powder （light or a relatively dense white powder （heavy by heating magnesium hydroxide or carbonate. Heating these magnesium salts under moderate conditions ?00 to 900 C for a few hours produces light magnesium oxide. Heating the salts under more rigorous conditions ?200 C for 12 hours produces heavy magnesium oxide. Light magnesium oxide is converted to heavy magnesium oxide by sustained heating at high temperatures.
（b The ingredient meets the specifications of the Food Chemicals Codex, 3d Ed. ?981? p. 178, which is incorporated by reference. Copies are available from the National Academy Press, 2101 Constitution Ave. NW., Washington, DC 20418, or available for inspection at the National Archives and Records Administration （NARA? For information on the availability of this material at NARA, call 202C741C6030, or go to:http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
（c In accordance with184.1（b）（1? the ingredient is used in food with no limitation other thancurrent good manufacturing practice. The affirmation of this ingredient as generally recognized as safe （GRAS as a direct human food ingredient is based upon the following current good manufacturing practice conditions of use:
? The ingredient is used as an anticaking and free-flow agent as defined in 170.3（o）（1 of this chapter; a firming agent as defined in170.3（o）（10 of this chapter; a lubricant and release agent as defined in 170.3（o）（18 of this chapter; a nutrient supplement as defined in 170.3（o）（20 of this chapter; and a pH control agent as defined in 170.3（o）（23 of this chapter.
? The ingredient is used in foods at levels not be exceed current good manufacturing practice. The ingredient also may be used in infant formula in accordance with section 412（g of theFederal Food, Drug, and Cosmetic Act（the act or with regulations promulgated under section 412（a）（2 of the act.
（d Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.
[50 FR 13559, Apr. 5, 1985]
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