College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Int J Biol Macromol. 2022 Oct 31;219:897-906. doi: 10.1016/j.ijbiomac.2022.08.030. Epub 2022 Aug 10.
In this work, konjac glucomannan (KGM)-based film reinforced with pullulan (PL) and acai berry extract (ABE) was developed by solvent casting method. The as-prepared films performed pH-sensitive properties, which can be potentially applied for fish freshness detection. Rheology, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) were used to characterize chemical structure and morphology of ABE-loaded KGM/PL (KP) films (KP-ABE). FT-IR spectrum indicated that hydrogen bond dominated the formation of KP-ABE films. Adding PL contributed to enhanced mechanical properties of KGM film with increased tensile strength (TS) from 21.25 to 50.27 MPa and elongation at break (EAB) from 10.64 to 19.19 %. Incorporating ABE upgraded flexibility, UV-shielding, thermostability, water barrier (decreased Water vapor permeability (WVP) from 2.07 to 1.67 g·mm/m·day kPa), antioxidant, and antibacterial ability of KP films, but weakened TS. In addition, KP-ABE films can reflect fish freshness in real time through color variability. Therefore, KP-ABE films exhibited potential applications in intelligent food packaging materials.
在这项工作中，通过溶剂浇铸法制备了魔芋葡甘聚糖（KGM）基膜，并用普鲁兰（PL）和阿萨伊莓提取物（ABE）增强。所制备的薄膜具有 pH 敏感性，可潜在应用于鱼类新鲜度检测。流变学、傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）用于表征 ABE 负载 KGM/PL（KP）薄膜（KP-ABE）的化学结构和形态。FT-IR 谱表明氢键主导了 KP-ABE 薄膜的形成。添加 PL 有助于提高 KGM 膜的机械性能，使拉伸强度（TS）从 21.25 增加到 50.27 MPa，断裂伸长率（EAB）从 10.64 增加到 19.19%。ABE 的加入提高了 KP 薄膜的柔韧性、紫外线屏蔽性、热稳定性、水阻隔性（水蒸气透过率（WVP）从 2.07 降低到 1.67 g·mm/m·day·kPa）、抗氧化和抗菌能力，但降低了 TS。此外，KP-ABE 薄膜可以通过颜色变化实时反映鱼类的新鲜度。因此，KP-ABE 薄膜在智能食品包装材料中具有潜在的应用前景。
