Method of Stabilization of Pet Food Palatant and Fat Systems
Adding an antioxidant including an extract of Labiatae species to a fat and palatant coating for pet food significantly reduced the loss of antioxidant and extended the shelf life of the pet food.
1 - 6 . (canceled)
7 . A composition for limiting the tocopherol loss in a pet food liquid surface coating for pet food kibble due to the accelerated oxidizing, prooxidant effect of an inedible animal liquid digest in the coating, comprising a tocopherol and non-tocopherol antioxidant with the tocopherol predominant and comprising two components:
(a) a fat/oil selected from the list consisting of poultry fat, mammal fat, vegetable oil and fish oil combined with tocopherols at 750 ppm to 2500 ppm to the fat/oil; and
(b) a liquid, water-based inedible digest of an animal selected from the list consisting of poultry, beef, pork, lamb and fish digest treated combined with an antioxidant selected from the list consisting of oil-soluble, mid-polar antioxidants and water-soluble, polar antioxidant botanical solvent extracts at 250 ppm to 1500 ppm to the digest.
8 . A composition of claim 7 , wherein the tocopherol rates to the fat/oil and total botanical extracts to the liquid digest to preferably yield a ratio of 1.5:1 to 3:1 tocopherol:botanical extract in the coating.
9 . A composition of claim 7 , wherein the fat/oil is poultry fat and the botanical extract is rosemary extract and wherein the fat:digest ratio is 1:1 and the tocopherol:rosemary extract ratio is 3:1.
10 . A composition of claim 7 , wherein the fat/oil and digest coating has a ratio of tocopherol:rosemary extract of 3:1 and wherein said coating reduces the net tocopherol loss by 60% or greater compared to a coating of fat/oil with the same level of tocopherol plus the digest without the rosemary extract.
11 . A composition of claim 10 , wherein the net tocopherol loss is reduced by 60% or greater when the coating is applied to the surface of pet food kibble.
12 . A composition of claim 11 , further comprising 0.6% STPP (sodium tripolyphosphate) whereby the net tocopherol loss by is reduced by not less than 80%.
13 . A composition of claim 7 , wherein the level of botanical extract is in excess of that required to stabilize the coating alone.
14 . A composition of claim 7 , further comprising sodium trypolyphosphate (STPP), wherein tocopherol is added to poultry fat, the botanical extract and STPP are added to the digest, wherein the ratio of tocopherol to botanical extract is 2:1, and wherein the treated poultry fat and treated digest are applied separately to the pet food kibble surface resulting in an increase in residual tocopherol level by 80% after 6 months of ambient storage compared to pet food kibble coated without the botanical extract.
15 . A composition of claim 7 , wherein the non-polar antioxidant is synthetic and wherein use of a synthetic antioxidant:botanical extract ratio of 1:1 to 2:1 reduces net synthetic antioxidant loss by at least 50% compared to use of the synthetic antioxidant without the botanical extract.
16 . A composition of claim 7 , further comprising adding a orthophosphate or polyphospate to the liquid digest at a level to deliver 0.6% phosphate to the pet food kibble and results in a reduction of the the net tocopherol loss in the liquid coating by at least 80%.
17 . A composition of claim 16 , wherein the polyphosphate is sodium tripolyphosphate (STPP).
18 . A composition of claim 7 , wherein the botanical extract is selected from the list consisting of extracts of rosemary, green tea and spearmint used singly or in combination.
19 . A pet food coating composition, comprising 50% poultry fat and 50% chicken viscera based liquid digest, wherein the poultry fat is treated with 750 ppm tocopherol and the digest is treated with between 250 ppm to 500 ppm of a botanical extract selected from the list consisting of mid-polar, oil-soluble rosemary extract, polar, water-soluble green tea extract and mid-polar, oil-soluble green tea extract to yield a tocopherol:botanical extract ratio of 1.5:1 to 3:1.
20 . A pet food kibble coating, comprising:
(a) an oil soluble non-polar tocopherol treated fat/oil; and
(b) an oil soluble mid-polar or water soluble polar botanical extract treated liquid inedible animal digest whereby the fat and liquid digest are either mixed together prior to application to the pet food kibble surface or applied separately to the pet food kibble surface.