Section 184.1540 - Nitrogen(a) Nitrogen (empirical formula N2, CAS Reg. No. 7727-37-9) is a colorless, odorless, flavorless gas that is produced commercially by the fractionation of liquid air.(b) The ingredient must be of a purity suitable for its intended use.(c) In accordance with § 184.1(b)(1) , the ingredient is used in food with no limitations other than current 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: (1) The ingredient is used as a propellant, aerating agent, and gas as defined in § 170.3(o)(25) of this chapter.(2) The ingredient is used in food at levels not to exceed current good manufacturing practice.(d) Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.48 FR 57270, Dec. 29, 1983, as amended at 73 FR 8607 , Feb. 14, 2008