Effects of Different Lowbush Blueberry Purees on Lipid Oxidation in Pre-cooked Ground Turkey Patties

A growing trend in the food industry is the development of pre-cooked, ready-to-eat, meat products that only require reheating. However, reheating meats creates off-flavors that have been identified as warmed-over flavors (WOF). The off-flavors pose a problem to product development specialists during the development of cooked meat products. Lipid oxidation has been determined to effect warmed-over flavor, texture, and the appearance of reheated meat products. Ground turkey undergoes lipid oxidation rapidly because of its high-unsaturated fat content. Blueberries contain antioxidants, including anthocyanins and phenolic acids, which could potentially retard the rate of lipid oxidation in precooked meats. Blueberries are assorted according to grades by color and size. Grade A is the standard for selling fiesh, but some blueberries do not meet the requirements for Grade A. Therefore, the blueberries that do not meet grade A status are utilized in other blueberry products or discarded. Two experiments were conducted to determine the effects of Grade A and Non-Grade A (Floater/Rejects) lowbush blueberry purees on oxidation in ground turkey patties held in refrigerated and frozen storage over time. In both studies, ground turkey patty treatments were prepared containing 3.5% wlw Grade A blueberry puree, 3.5% Non-Grade A blueberry puree, and a control with 0% puree. Patties were held in refrigerated storage at 4C and frozen storage at -18C. Gas chromatography using headspace analysis and thiobarbituric acid tests (TBARS) were performed to determine the extent of lipid oxidation. Overall, in both studies there were significantly lower (p50.05) TBARS and hexanal concentrations for both purees compared to the control patties regardless of storage temperature. The blueberry purees retarded the rate of lipid oxidation in the turkey patties. The possible implications of these studies are incorporating blueberry purees into precooked meat systems to prevent lipid oxidation. Warmed-over flavor (WOF) attributes were determined by a descriptive sensory panel. Results showed that panelists described WOF taste as rancid and metallic. Panelists also found blueberry treatments had a sweeter flavor than a control patty with no puree. An acceptance panel determined that both purees were acceptable in precooked ground turkey patties compared to a control with no puree and a fresh cooked turkey patty. However, panelists were less likely to purchase pre-cooked turkey patties containing either blueberry puree compared to a fresh cooked turkey patty

2002 Wild Blueberry Project Reports

The 2002 edition of the Wild Blueberry Project Reports was prepared for the Wild Blueberry Commission of Maine and the Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include: 1. Factors Affecting Microbial and Pesticide Residue Levels on Wild Blueberries 2. Effect of Blueberry Products on Oxidation in Meat Based Food 3. Determination of Pesticide Residue Levels in Freshly Harvested and Processed Wild Blueberries 4. Detection of Infested Wild Blueberries using Near-Infrared Spectroscopy 5. Investigation Of The Mechanism By Which Blueberry Fractions Maintain Arterial Integrity 6. Antioxidant Assessment in the Elderly 7. Water Use of Wild Blueberries and the Impact of Plant Water Stress on Yield 8. Control Tactics for Wild blueberry Pest Insects 9. IPM Strategies 10. Pest Biology 11. Wild Blueberry Pollination Research 12. Survey and Determination of Effective Control of Stem Blight and Leaf Spot Diseases in Wild Blueberry Fields 13. Effect of Foliar-applied Iron Chelate Concentration on Leaf Iron Concentration, Wild Blueberry Growth and Yield 14. Effect of Boron Application Methods on Boron Uptake in Wild Blueberries 15. Effect of Foliar N spray on Leaf N Concentration, Growth and Yield of Wild Blueberries 16. Effect of Foliar Spray (4-13-15) on Leaf Nutrient Concentration, Growth and Yield of Wild Blueberries 17. Effect of Foliar Copper Application on Growth and Yield of Wild Blueberries 18. Effect of Foliar Copper and/or Iron Application on Growth and Yield of Wild Blueberries 19. Effect of Soil pH on Nutrient Uptake 20. Assessment of Hexazinone Alternatives for Weed Control in Wild Blueberries and Weed Control 21. Evaluation of Fall Applications of Sulfonylurea Herbicides for Bunchberry Control in Wild Blueberries 22. Evaluation and Demonstration of Techniques for Filling in Bare Spots in Wild Blueberry Fields 23. Blueberry Extension Education Program Base 24. 2002 Pesticide Groundwater Survey 25. Cultural Weed Management using sulfur to lower the p

2000 Wild Blueberry Project Reports

The 2000 edition of the Wild Blueberry Project Reports was prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include: 1. Determination of Pesticide Residue Levels in Fresh and Processed Wild Blueberries 2. Factors Affecting the Microbiological Quality of IQF Blueberries 3. Effect of Processed Blueberry Products on Oxidation in Meat Based Food Systems 4. Separation of Maggot Infested Wild Blueberries in the IQF Processing Line 5. Water Use of Wild Blueberries 6. Control Tactics for Blueberry Pest Insects, 2000 7. IPM Strategies 8. Biology and Ecology of Blueberry Pest Insects 9. Survey of Stem Blight and Leaf Spot Diseases in Lowbush Blueberry Fields 10. Phosphorus/Nitrogen Fertilizer Ratio 11. Effect of Boron Application Methods on Boron Uptake in Lowbush Blueberries 12. Effect of Foliar Iron and Copper Application on Growth and Yield of Lowbush Blueberries 13. Effect of Soil pH on Nutrient Uptake 14. Effect of Nutri-Phite (tm) P+K on Growth and Yield of Lowbush Blueberry 15. Effect of Fertilizer Timing on Lowbush Blueberry Growth and Productivity 16. Assessment of Azafenidin for Weed Control in Wild Blueberries 17. Assessment of Rimsulfuron for Weed Control in Wild Blueberries 18. Assessment of Pendimethalin for Weed Control in Wild Blueberries 19. Assessment of VC1447 for Weed Control in Wild Blueberries 20. Cultural Management Using pH for Weed Control in Wild Blueberries 21. Evaluation of Sprout-Less Weeder® for Weed Control in Wild Blueberries 22. Evaluation of RoundUp Ultra® and Touchdown 5® for Weed Control in Wild Blueberries 23. Evaluation and Demonstration of Techniques for Filling in Bare Spots in Wild Blueberry Fields 24. Evaluation of Fungicides Efficacy in Wild Blueberry Fields 25. Velpar® and Sinbar/Karmex® Demonstration Plot Comparison Trial 26. Blueberry Extension Education Program in 2000 27. 2000 Hexazinone Groundwater Surve

2001 Wild Blueberry CSREES Project Reports

The 2001 edition of the Wild Blueberry CSREES Progress Reports was prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include: 1. Effect of Wild Blueberry Products on Oxidation in Meat Based Food Systems 2. Factors Affecting the Microbial and Pesticide Residues Levels on Wild Blueberries 3. Determination of Pesticide Residue Levels in Fresh and Processed Wild Blueberries 4. Separation of Maggot-Infested Wild Blueberries in the IQF Processing Line 5. Water Use of Wild Blueberries and the Impact of Plant Water Stress on Yields 6. Survey of Stem Blight and Leaf Spot Diseases in Wild Blueberry Fields 7. IPM Strategies 8. Control Tactics for Wild Blueberry Pest Insects, 2001 9. Biology and Ecology of Blueberry Pest Insects 10. Diurnal Bee Activity and Measurement of Honeybee Field Strength 11. Effect of Foliar-applied Iron (Fe) Chelate Concentration on Leaf Iron Concentration, Wild Blueberry Growth and Yield 12. Effect of Boron Application Methods on Boron Uptake in Wild Blueberries 13. Effect of Foliar Iron and Copper Application on Growth and Yield of Wild Blueberries 14. Effect of Fertilizer Timing on Wild Blueberry Growth and Productivity 15. Effect of Foliar Copper Application on Growth and Yield of Wild Blueberries 16. Effect of Prune-year Applications of Nutri-Phitetm P or Nutri-Phitetm P+K on Growth and Yield of Wild Blueberry (Vaccinium angustifolium Ait.) 17. Effect of Soil pH on Nutrient Uptake 18. Assessment of Azafenidin for Weed Control in Wild Blueberries 19. Assessment of Rimsulfuron for Weed Control in Wild Blueberries 20. Assessment of Pendimethalin for Weed Control in Wild Blueberries 21. Evaluation and Demonstration of Techniques for Filling in Bare Spots in Wild Blueberry Fields 22. Assessment of Sprout-less Weeder for Hardwood Control in Wild Blueberries 23. Wild Blueberry Extension Education Program in 2001 24. Evaluation of Fungicide Efficacy in Wild Blueberry Fields 25. 2001 Pesticide Groundwater Survey 26. Cultural Weed Management Using Sulfur to Lower the pH 27. Wild Blueberry Web Sit