Please be aware that phosphate and phosphate salts may be used as palatants in pet foods.

"In accordance with another embodiment, a composition is provided as a palatability system containing green tea, a hydrolyzed liver or other protein source, brewers yeast, and a phosphate or phosphate salt (such as trisodium pyrophosphate or disodium phosphate for example). The green tea may be applied in this embodiment at, for example, 0.01-25% by weight of the palatability system (or 1-15% or 2-9%), and at 0.01-1.0% (or 0.025-0.5%) by weight of the final pet food product. Such an embodiment can provide significantly increased palatability enhancement at good cost."

http://www.freshpatents.com/Palatability-enhancing-compositions-and-foods-for-pets-and-methods-regarding-the-same-dt20081204ptan20080299286.php?type=description

Also,

"Trials were conducted at the SPF Research Center to determine the impact of phosphoric acid coating on cat kibble palatability. The goals of this research were to identify the interactions with palatability enhancers used as a coating and to identify the best way to coat kibble with phosphoric acid to maximize palatability."

http://www.petfoodindustry.com/ViewArticle.aspx?id=12656

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