‘Air filled emulsions’ could reduce fat, ease obesity: Study

By Stephen Daniells

- Last updated on GMT

Related tags Nutrition Emulsion

Fungal proteins could produce aerated emulsions with the potential to act as fat replacers in foods, according to promising results from England.

Researchers from the University of Birmingham, led by Dr Philip Cox, report these air filled emulsions could reduce the fat content of a food system by 50 per cent.

Furthermore, these three-phase (air/oil/water) emulsions remained stable during storage for 45 days, according to findings published online ahead of print in the journal Food Hydrocolloids​.

Reduction of fat in products is a growing area of interest to food manufacturers as consumers continue to seek out low-fat and low-calorie versions of their favourite foods.

All indications are that these stabilised air filled emulsions will be successful forproducing reduced fat food products,”​ wrote Dr Cox and his co-workers.

The reason is that the air cells in the air filledemulsion have a robust surface structure, given by the hydrophobin film, and this helpsprevent disproportionation and ripening, over 45 days in our study.

Fungal proteins and food foams

The key to air filled emulsions is hydrophobin HFBII, protein extracted from Trichoderma reesei​. Previously, researchers from Unilever resported that hydrophobin HFBII at a concentration of 0.1 per cent could produce food foams with exceptional stability, and this could lead to improvements in the physical and sensory properties of a range of products, including low fat whipping cream, ice cream and sorbets.

Low fat foods

“It is possible that small, stable, air bubbles designed to resemble oil droplets in terms of their size and physical properties could be used to produce a new generation of low fat foods,”​ explained the researchers.

“However, a challenge remains to produce an air based fat mimic with acceptable shelf life for soft solid or liquid foods.”

In attempt to move closer to aerated, low-fat products, the Birmingham-based researchers used a sonication process to produce a ‘fat globule mimic’ by using the hydrophobins to coat and stabilize air cells. The cells ranged in size from 1 to 100 micrometres, with over 40 per cent in the 1 to 2 micrometres range.

Dr Cox and his co-workers report that the air cells were “capable of surviving high shear processing steps for up to 7 minutes shearing”​.

This ‘air filled emulsion’ was then used to produce a prototype food with three phases: air in oil in water. The system consisted of 30 per cent air phase, and 30 per cent oil phase stabilized by Tween 60.

This tri-phasic system allowed the fat content of the model food to be reduced by more than 50 per cent, compared to a rheologically similar oil water emulsion​, said Cox and his co-workers.

The tri-phasic emulsions were found to be stable in terms of both volume and air content over 45 days.

The study was supported financially by the BBSRC.

Source: Food Hydrocolloids​ Published online ahead of print, doi: 10.1016/j.foodhyd.2009.03.005"Hydrophobins stabilised air filled emulsions for the food industry"​ Authors: F. Tchuenbou-Magaia, I.T. Norton, P.W. Cox

Related topics R&D Ingredients

Related news

Show more

Related products

show more

Unlock the business potential of the protein trend

Unlock the business potential of the protein trend

Content provided by Valio | 08-Feb-2024 | White Paper

Read our white paper to learn how to overcome taste and texture challenges in protein products — and how to commercialise the protein trend by making delicious...

Custom Microbiome Solutions for Dairy & Alt-Dairy Products

Custom Microbiome Solutions for Dairy & Alt-Dairy Products

Content provided by ADM: Innovation that Feeds the Future | 13-Oct-2023 | White Paper

Backed by clinical studies and perfect for use in dairy and alt-dairy applications alike, ADM’s Active Lifestyle probiotic blend, BPL1™ probiotic, and...

Consumers Want Dairy—and More!

Consumers Want Dairy—and More!

Content provided by ADM: Innovation that Feeds the Future | 06-Oct-2023 | White Paper

In the thriving dairy industry, you’re well aware of the surging demand for both dairy and non-dairy products.

Related suppliers