Lipid droplets turn fat mobilisation into a quality variable

Lipid-droplet remodelling should be regarded as a process variable in cured, fermented, heated and stored meat products. A new review in Food Bioscience organises the evidence on how these intracellular structures change during processing and why those changes may affect aroma and oxidative stability at the same time.

Lipid droplets store triglycerides and are surrounded by a phospholipid monolayer containing surface proteins. According to the authors, salting, curing, fermentation, heating and storage can alter droplet morphology and the accessibility of fats to lipases. When hydrolysis increases, free fatty acids are released: they are precursors of aroma compounds, but also increase the substrate available for oxidation.

The review finds the most coherent meat-specific evidence in salted porcine muscle, where droplet remodelling was associated with increased triglyceride-hydrolase activity and neutral-lipid hydrolysis. Yet the authors emphasise a crucial limitation: experiments still need to demonstrate, within one processing system, a direct causal link between remodelling, the resulting volatiles and subsequent oxidation.