The purity specifications for manufacture of food ingredients and methods for detecting these ingredients in food can be found in the following documents.

• Methods incorporated by reference in the food additive regulations for determining compliance with listed specifications are available from the Office of Food Additive Safety.
• Specification monographs from the Food Chemicals Codex are incorporated by reference in many of the food additive regulations. The most recent edition (6^th) was published in 2008 and may be purchased from: The United States Pharmacopeia, 12601 Twinbrook Pkwy, Rockville, MD 20852; 1-800-227-8772 or 1-301–881–0666; (Internet) www.usp.org.

FDA has developed several chemistry guidance documents for industry to assist with submissions for food ingredients and packaging.

• Food ingredients and packaging: chemistry guidance documents for industry.