更多關(guān)于已證實屬于一般公認(rèn)為安全（GRAS）的可直接加入食品中的物質(zhì)種類，請點擊美國FDA 21 CFR 第184部分已證實屬于一般公認(rèn)為安全（GRAS）的可直接加入食品中的物質(zhì)種類匯總
§ 184.1923 Urea.
（a） Urea （CO（NH2）2, CAS Reg. No. 57–13–6） is the diamide of carbonic acid and is also known as carbamide. It is a white, odorless solid and is commonly produced from CO2by ammonolysis or from cyanamide by hydrolysis.
（b） The ingredient must be of a purity suitable for its intended use.
?。╟） In accordance with §184.1（b）（1）, the ingredient is used in food with no limitation other than current good manufacturing practice. The affirmation of this ingredient as generally recognized as safe as a direct human food ingredient is based upon the following current good manufacturing practice conditions of use:
?。?） The ingredient is used as a formulation aid as defined in §170.3（o）（14） of this chapter and as a fermentation aid.
?。?） The ingredient is used in yeast-raised bakery products; in alcoholic beverages as defined in §170.3（n）（2） of this chapter; and in gelatin products.
?。╠） Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.
[48 FR 51616, Nov. 10, 1983, as amended at 49 FR 19816, May 10, 1984; 73 FR 8608, Feb. 14, 2008]
