Preparation and Preservation Properties of Tea Polyphenol/Zein/Gelatin Coaxial Electrospinning Film
Objective:Protein fiber films loaded with tea polyphenols were obtained as the active packaging films for tu-na,and the characteristics and preservation properties of the packaging film were explored.Method:Zein/gelatin(ZG)fiber films loaded with different concentration core materials of tea polyphenols(10,20,30 mg/mL)was prepared by coaxial electrospun technology.The morphology and characteristics of the fiber film were analyzed by scanning electron microscopy,infrared spectroscopy,X-ray diffraction,differential scanning calorimetry,hydrophilicity and hydrophobicity,antibacterial and antioxidant tests,and preservation properties for tuna was analyzed.Results:The average fiber diame-ters of ZG,TP1/ZG,TP2/ZG and TP3/ZG films were(810±240),(930±270),(880±150)and(850±610)nm,respec-tively.TP in TP/ZG coaxial nanofibers did not significantly change the chemical structure and crystal structure of the ZG film.Each TP/ZG film has a ZG-like heat absorption peak near less than 130℃.The 60 s contact angles of TP1/ZG,TP2/ZG and TP3/ZG are(105.89±5.14)°,(91.32±5.11)° and(73.36±4.20)°,respectively.The thermal properties and water contact angles of TP/ZG films decreased with increasing TP concentration.TP endowed TP/ZG membrane with good antibacterial and antioxidant properties,and has a significant inhibitory effect on Shewanella putrefaciens in aquatic products.TP/ZG can effectively inhibit the total viable counts,pH value,volatile base nitrogen,fat oxidation and texture deterioration of tuna fillets stored at 4 ℃,and can prolong the shelf life of tuna for 3 days.Conclusion:ZG coaxial fiber film loaded with appropriate TP possessed good morphology,water resistance,antibacterial,antioxidant and preser-vation properties,which can be used as a new type of antibacterial and antioxidant food packaging material.
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