期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 185, 期 -, 页码 959-965出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.06.198
关键词
pH-sensitive film; Raspberry pomace extract; Pork
资金
- Shanxi Scholarship Council of China [2020101]
- Opening Project Fund of Key Laboratory of Biology and Genetic Resources of Rubber Tree, Ministry of Agriculture and Rural Affairs, P. R. China/State Key Laboratory Breeding Base of Cultivation Physiology for Tropical Crops/Danzhou Investigation Experim [RRIKLOF201901]
Raspberry pomace extracts were successfully incorporated into a composite film, resulting in colorimetric raspberry films with improved physical properties and antioxidant capacity. These films can exhibit color changes at different pH levels, making them potentially useful for monitoring food freshness.
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 (PAXR5, PAXR15 and PAXR30). 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, PAXR15 had an excellent discoloration at pH 1-13, especially at pH 5-10, the color changes of PAXR15 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.
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