Development of a shelf-stable dairy protein beverage
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Date
2015-05
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Publisher
The Ohio State University
Abstract
The purpose of this project was to create a shelf-stable high protein beverage using whole milk, milk protein isolate (MPI), and potassium citrate with added coffee flavor and non-caloric natural high-intensity sweeteners. This product fills a gap in the market and improves upon the quality of current dairy protein beverages. Potassium citrate was used to reduce sedimentation by preventing protein coagulation during heat sterilization. Effect of different levels of citrate were measured in beverages of different protein contents and pH levels. Citrate was added to beverages (milk and MPI) in levels between 0-0.75% by weight. Protein levels were adjusted to 8%, 9%, and 10% by adding 4.6g, 5.6g, or 6.6g MPI/100g milk, respectively. pH was adjusted to 6.8 or 7.0. Beverages were filled into size 300x407 (15oz) cans and sterilized in a still retort at 250°F for 20 minutes. Particle size analysis was performed as an indicator of degree of protein coagulation. At 0.25% citrate, particle size decreased 13-25% for the protein levels tested. Above 0.25%, particle size increased. On average, particle size was smaller in beverages at pH 6.8 than pH 7.0. Sensory analysis was performed on chilled samples containing 8% protein using a panel of 80 adults, primarily males age 21-34. Three samples with different sweetener profiles were tested; a combination of stevia and monkfruit was preferred based on overall liking score of 5.9 on a 9-point scale. Added citrate did not diminish creaminess or mouthfeel liking, which scored 6.0. Although sweetness was acceptable at 5.5, data shows that a higher level of sweetness would be preferred. Coffee flavor was liked by panelists with a score of 6.0. These findings show that this beverage containing 8% protein, coffee flavor, and natural sweetener is liked by target consumers and with adjustments to sweetness is ready for commercialization.
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Keywords
dairy, protein, product development, beverage