Data provider:

Icon data provider

The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Color the food naturally  [1981]

Francis, F.J.;

استعراض النص الكامل

Food colorants are available from natural sources, but technological problems such as cost, instability, availability, and FDA standardization and characterization requirements limit their applications. Anthocyanins produce red and blue colors in fruits. In addition to supply and cost limitations, pigment extraction produces polymers which cannot be chemically defined, and therefore cannot be approved as colorants by the FDA. Since all anthocyanin extracts contain yellow pigments (flavonoids), tannins and cathechins, costly purification of crude pigment extracts is also necessary. Betacyanins are natural red pigments found in beets, but their addition to foods causes flavor problems. Pigment preparations concentrated by new processing methods would require new food additive petitions to the FDA. Both anthocyanins and betacyanins are less chemically stable, and more expensive, than F.D.E.C. food colorants. Carotenoids which are structurally identical to their naturally-occurring counterparts have been synthesized and used as colorants; their purity and safety can be controlled. Other natural extracts include annato, paprika, turmeric, saffron and cochineal


Professional Nutritionist (USA)