Abstract:To improve the storage period of freshwater fish floss, the tea polyphenol phospholipids complex (TPP-PL) was synthesized, and its solubility, slow-releasing potential, antioxidant activity, peroxide value and fatty acid composition were studied. The results showed that phospholipid coating can effectively improve the lipophilicity of tea polyphenols. In the chloroform-water and ethyl acetate-water solvent systems, the hydrophilic lipophilic partition coefficient K of TPP-PL and TPP were 150.8 and 21.33, respectively. The TPP-PL appears good slow-releasing potential. After 24 hours of storage, the in vitro releasing rate of TPP-PL was only 24% ± 3.6%, indicating that the TPP-PL has a good and sustained releasing capacity. In addition, the DPPH free radical scavenging ability and the ferric reducing antioxidant power of TPP-PL have a dose effect. The DPPH free radical scavenging ability of TPP-PL was similar with that of TPP due to the demulsification effect, while the ferric reducing antioxidant power of TPP-PL was slight lower than that of TPP. The TPP and TPP-PL were applied in the frying of freshwater fish floss. The peroxide value of the TPP treated fish floss is 50 meq/kg more than that of the TPP-PL treated fish floss after storage for 20 days. After frying the fish floss, the content of unsaturated fatty acids in fish meat was decreased, linoleic acid significantly reduced by 11.02%, the content of saturated fat increased, the content of stearic acid increased significantly by 23.28%, stearic acid increment (1.46%) and linoleic acid reduction (4.29%) of fish floss with TPP-PL were lower than stearic acid increment (12.05%) and linoleic acid reduction (8.26%) of fish floss with TPP. It demonstrated that the TPP-PL can prevent the lipid oxidation during the frying process and storage, extend the shelf-life, and maintain the nutrition of the fish floss. The TPP-PL has great potential in industrial development and utilization.