School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China; Dezhou Graduate School of North University of China, Dezhou 253034, China.
School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China.
Int J Biol Macromol. 2021 Aug 31;185:959-965. doi: 10.1016/j.ijbiomac.2021.06.198. Epub 2021 Jul 4.
Raspberry pomace extracts (RPE) with different concentrations (0.5 g/L, 1.5 g/L and 3 g/L) were incorporated into pectin/sodium alginate/xanthan gum composite film (PAX) to prepare colorimetric raspberry films (PAXR, PAXR and PAXR). Fourier Transform Infrared and Scanning Electron Microscopy analysis showed RPE had good compatibility with PAX. Compared to PAX, the raspberry films had lower water vapor permeability and water swelling ratio, higher tensile strength, opacity and antioxidant capacity. The films presented a smoother surface and denser structure than PAX. Furthermore, PAXR had an excellent discoloration at pH 1-13, especially at pH 5-10, the color changes of PAXR from pink-red-brown-blue-dark green distinguished by the naked eyes. Therefore, it has the potential to become a pH-sensitive film used in monitoring protein-rich food freshness.
树莓渣提取物（RPE）以不同浓度（0.5 g/L、1.5 g/L 和 3 g/L）被掺入果胶/海藻酸钠/黄原胶复合膜（PAX）中，以制备比色树莓膜（PAXR、PAXR 和 PAXR）。傅里叶变换红外和扫描电子显微镜分析表明，RPE 与 PAX 具有良好的相容性。与 PAX 相比，树莓膜具有较低的水蒸气透过率和水膨胀率、更高的拉伸强度、不透明度和抗氧化能力。与 PAX 相比，这些薄膜的表面更光滑，结构更致密。此外，PAXR 在 pH 1-13 之间具有极好的变色性能，尤其是在 pH 5-10 之间，肉眼可以分辨出 PAXR 从粉红色-红色-棕色-蓝色-深绿色的颜色变化。因此，它有可能成为一种用于监测富含蛋白质的食物新鲜度的 pH 敏感膜。
