Ultrafiltered Milk Cheese Shows 10 Times More Glutamate in New Flavour Study
Ultrafiltered milk cheese tastes and smells different from conventional cheese, according to a 2026 study in Food Chemistry: X. Researchers led by Cai found that ultrafiltration changes the microbes, amino acids and aroma compounds in natural cheese. The method also keeps whey proteins inside the cheese, so it removes the whey waste stream.
How the ultrafiltered milk cheese was made
The team passed skim milk through a 10 kDa membrane. This concentrated the milk about five times. Whey proteins stayed in the retentate, which then became cheese.
The design was a 2 by 2 comparison. The researchers made conventional and ultrafiltered cheeses with two different starter cultures. All cheeses ripened for seven days at 15 degrees Celsius. This setup let the team separate the effect of the process from the effect of the starter.
More umami in ultrafiltered milk cheese
Ultrafiltered cheeses had more free amino acids. Umami amino acids rose between 3.5 and 4.9 times. Glutamate reached 10.2 times the control level when a Lactococcus-based starter was used.
Glutamate is the compound behind the savoury taste in many foods. Therefore, ultrafiltered milk cheese could deliver a richer taste in a short ripening time. That could help makers of fresh and young cheeses.
Aroma and metabolite shifts
The study annotated 3,952 metabolites. Carbohydrates fell about 63% in ultrafiltered cheese, and several glycerophospholipids increased. Free-acid volatiles dropped 59% to 69%. In contrast, methyl ketones, the lactone delta-octalactone and benzyl alcohol rose.
Together these changes moved the aroma toward fruity and creamy notes. In plain words, ultrafiltered milk cheese smells less sharp and more rounded than the control cheese.
What the microbes did
Firmicutes made up more than 99% of all samples. The starter culture shaped the community more than the milk matrix did. This finding is useful for plant managers. It suggests that choosing the right starter matters as much as choosing the process.
Limits and what comes next
The authors call the links between microbes and flavour hypothesis-generating. The study looked at only one early ripening point of seven days. Also, the aroma results were not confirmed by a sensory panel. Therefore, nobody can yet say how consumers would rate the cheese.
Even so, the work points to a practical gain. Ultrafiltered milk cheese could raise yield, cut whey disposal and offer new flavours. Dairy plants that already own membrane equipment may find it worth testing. Researchers should now study longer ripening, taste panels and cost.
Why ultrafiltered milk cheese interests dairy plants
Whey disposal is a real cost for cheese makers. Ultrafiltered milk cheese keeps those proteins in the product, so more of the milk ends up as cheese. As a result, yield can rise without extra milk. In addition, the process could cut wastewater load, which helps plants meet environmental rules.
However, membranes cost money and need cleaning. Plants must weigh these costs against higher yield and a new flavour range. Small dairies may start with pilot batches. Larger plants that already run ultrafiltration for other products may adopt ultrafiltered milk cheese faster.
Frequently asked questions
What is ultrafiltered milk cheese?
It is cheese made from milk concentrated through a membrane, so whey proteins stay in the cheese instead of draining away.
What did the study find?
Umami amino acids rose 3.5 to 4.9 times, glutamate reached 10.2 times the control with one starter, and aroma moved toward fruity and creamy notes.
Has the flavour been tested by tasters?
No. The authors note that the aroma results lacked sensory validation.
Related reading
Source: Bioengineer.org | DairyNews7x7. Summarised independently in our own words.
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