Abstract
Fruit pomace and cheese whey were incorporated in milk protein extruded products as a source of dietary fiber and nutrients. Feed formulations containing 70–90 % milk protein concentrate (MPC) with 22 % fruit pomace were processed by supercritical fluid extrusion (SCFX) at low temperatures (~90 °C). The process also incorporated concentrated whey containing 20.2 wt% total solids by directly injecting the whey into the extruder barrel at 27.5 wt% of the dry-feed flow rate, providing 5.6 % whey solids to feed formulation. The resulting MPC extrudates retained the natural fruit color following SCFX processing, indicating that little, if any, browning occurred during the processing even though a significant quantity of soluble sugars was present in both pomace and whey. The addition of 22 % fruit pomace and 5.6 % (dry wt) whey solids did not affect the piece density (0.24–0.31 g/cm3), expansion ratio (4.6–5.7), and hardness (38–78 N) of MPC extrudates, which were comparable to starch- or protein-based extrudates made by conventional steam extrusion. Utilizing fruit pomace and whey in extruded products improves the nutritional contents of extruded products and adds value to the by-products.
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Acknowledgments
We thank Mr Tom Gibson (New York State Agricultural Experiment Station, Geneva, NY) for providing apple pomace for this research, Mr Sean Schell for his technical assistance during extrusion processing, and Wenger Manufacturing, Inc. (Sabetha, KS, USA) for providing the TX-52 magnum extruder used in this research.
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This work was supported by the USDA National Institute of Food and Agriculture, Hatch project NYC 2013-14-345.
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Sun, V.Z., Paraman, I. & Rizvi, S.S.H. Supercritical Fluid Extrusion of Protein Puff Made with Fruit Pomace and liquid Whey. Food Bioprocess Technol 8, 1707–1715 (2015). https://doi.org/10.1007/s11947-015-1526-8
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DOI: https://doi.org/10.1007/s11947-015-1526-8