Whey Protein Bitterness Linked to Concentrated Minerals
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- University of Reading, Aberystwyth University, and Arla Foods Ingredients collaborated on whey protein research published in the International Dairy Journal to address taste and texture issues in protein drinks.
- The research team used controlled pressure and a fine membrane to push liquid whey through a filter, concentrating alpha-lactalbumin—a protein prized in infant formula—to more than twice its typical level.
- A trained sensory panel found the enriched whey delivered smoother texture and reduced mouth friction, but also detected stronger bitter and peppery flavors compared to standard whey.
- Further analysis traced those unwanted flavors to minerals that became concentrated during processing—not to the alpha-lactalbumin itself, pinpointing the problem's actual source.
- The researchers modified the filtration process to strip out the concentrated minerals, producing a final product that matched the original whey protein's taste while retaining the smoother-drinking texture improvements.
- Lead author Holly Giles, a PhD researcher at the University of Reading, said the findings give the team clear directions to make protein drinks "more palatable and nutritious" for people building muscle or maintaining strength with age.
Why it matters: Bitterness in protein drinks is a known barrier to consumption, especially for older adults trying to maintain strength. The Reading-led team has now isolated the specific culprit (co-concentrated minerals) and demonstrated a filtration fix that keeps the texture benefits of alpha-lactalbumin enrichment while restoring acceptable taste—a concrete manufacturing pathway backed by sensory panel data.
