To effectively solve the problem that the cream top of milk tea is easy to combine with the tea broth quickly within a short period after production, this paper used corn starch as the film-forming matrix, citric acid as the cross-linking agent, and zein nanoparticles (ZNP) as the hydrophobicity enhancer, to prepare a kind of citric acid-ZNP composite thin film with good water-blocking properties and mechanical properties.The structure of the composite film was characterized by Fourier infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and X-ray diffraction to explore the physical parameters of the film, such as mechanical, water resistance, and optical properties.In addition, the water resistance test of the composite films under different tea broths (Jasmine green tea, Four Seasons Spring, Dahongpao, and Ceylon black tea), different temperatures (4 ℃, 37 ℃, and 45 ℃), and different retention time (0.5, 1.0, 1.5, 2, 4, 24 h) was explored, and the application of the composite films in milk tea creamer tops was verified.Results showed that starch could be used as an excellent carrier for ZNP, and the composite films had good thermal stability, mechanical properties, and barrier properties.Among them, the tensile strength reached 4.35 MPa, the elongation at break reached 44.21%, and the water vapor permeability was 3.07×10-12 g·cm/(cm2·s·Pa).In the application verification of different tea bases, the water solubility was highest in Dahongpao tea broth, and the composite film reached the lowest value of water solubility and dissolution at 1.5 h.The milk tea with ZNP-citric acid starch composite film was placed at 60 min before the cream started to fuse with the tea base.In summary, the ZNP-citric acid composite film can effectively preserve milk tea with a cream topping, which tends to collapse in a short period of time, thereby preventing the problem of rapid mixing with the tea broth.This film can serve as a novel, food-specific material.
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