Chitosan nanoparticles effectively improved quality stability of pork patties subjected to multiple freeze-thaw cycles.

The potential of chitosan nanoparticles (CHNPs) for improving the quality stability of pork patties under freeze-thaw (F-T) cycles was studied. Chitosan nanoparticles were successfully produced by the ionotropic gelation method. Pork patties were incorporated with 0%, 0.5% chitosan, 1% chitosan, 0.5% CHNPs, and 1% CHNPs and then subjected to repeated F-T cycles. Results showed that CHNPs were able to inhibit lipid and protein oxidation with a significant decrease in the lipid malondialdehyde and protein carbonyl formation in the patties after seven F-T cycles. Low-field nuclear magnetic resonance (LF-NMR) results indicated that CHNPs effectively restrained water mobility of samples. In addition, CHNPs exhibited a distinguishable improvement in the textural properties and water holding capacity in the stored patties during F-T cycles. Thus, CHNPs could be used as a natural ingredient to protect frozen patties from quality degradation caused by temperature fluctuations.