Abstract The pomelo peel flour (PPF) film-forming dispersions were physically modified by high-pressure homogenization (HPH) process at various pressures (0–80 MPa) to prepare biopolymer films. The effects of different HPH pressures on microstructure and properties of PPF dispersions and their resultant films were investigated. The results showed that as the homogenization pressure increased, the mean particle sizes of PPF dispersions decreased significantly from 78.76 μm to 19.87 μm, highlighting the disrupting effect of HPH. Meanwhile, the PPF dispersions after HPH exhibited a shear-thinning behavior with higher apparent viscosities and better colloidal stability, indicating the improved uniformity and consistency. Consequently, the resultant PPF films had not only more compact microstructure and transparent appearance, but also better water vapor barrier and mechanical properties. In particular, the PPF film from HPH treated dispersion at 60 MPa had relatively best performance among them, the tensile strength and elongation at break of which respectively increased from 9.88 to 23.55 MPa and 6.09% to 17.68%, while the water vapor permeability decreased from 4.10 × 10−10 to 2.08 × 10−10 g/m·s·Pa, compared to the untreated film. However, a slight deterioration in these above mentioned properties was observed for 80 MPa HPH treated films, which might be attributed to the undesirable degradations of biopolymers (such as pectin and dietary fiber) occurred at excessively high homogenization pressure. These findings reveal that HPH process has a potential application in developing novel biopolymer films from pomelo peel with enhanced properties.

中文翻译：

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高压均质对柚皮粉成膜分散液及其成膜结构和性能的影响

摘要 柚皮粉 (PPF) 成膜分散体通过高压均质 (HPH) 工艺在不同压力 (0–80 MPa) 下进行物理改性以制备生物聚合物薄膜。研究了不同 HPH 压力对 PPF 分散体及其所得薄膜的微观结构和性能的影响。结果表明，随着均质压力的增加，PPF分散体的平均粒径从78.76 μm显着下降到19.87 μm，突显了HPH的破坏作用。同时，HPH 后的 PPF 分散体表现出剪切稀化行为，具有更高的表观粘度和更好的胶体稳定性，表明均匀性和一致性得到改善。因此，所得 PPF 薄膜不仅具有更致密的微观结构和透明的外观，而且水蒸气阻隔性和机械性能也更好。特别是60 MPa的HPH处理分散体的PPF薄膜性能相对最好，其拉伸强度和断裂伸长率分别从9.88增加到23.55 MPa和6.09％到17.68％，而水蒸气渗透率从与未处理的薄膜相比，4.10 × 10-10 至 2.08 × 10-10 g/m·s·Pa。然而，对于 80 MPa HPH 处理过的薄膜，观察到上述这些性能略有下降，这可能是由于在过高的均质压力下发生了生物聚合物（如果胶和膳食纤维）的不良降解。这些发现表明，HPH 工艺在开发具有增强性能的柚皮新型生物聚合物薄膜方面具有潜在的应用价值。