中国塑料 ›› 2025, Vol. 39 ›› Issue (9): 49-57.DOI: 10.19491/j.issn.1001-9278.2025.09.008

• 材料与性能 • 上一篇    下一篇

生熟紫薯双层膜的制备及其在猪肉糜新鲜度监测中的应用

谢微1(), 邓忠惠2(), 颜瑜1   

  1. 1.贺州学院食品与生物工程学院,广西康养食品科学与技术重点实验室,广西 贺州 542899
    2.贺州学院人工智能学院,广西 贺州 542899
  • 收稿日期:2024-10-21 出版日期:2025-09-26 发布日期:2025-09-22
  • 通讯作者: 邓忠惠(1980-),男,高级实验师,研究方向为智能检测与智能控制,7821968@qq.com
    E-mail:249201676@qq.com;7821968@qq.com
  • 作者简介:谢微(1984-),女,高级实验师,研究方向为食品分析与检测,249201676@qq.com
  • 基金资助:
    贺州学院学科交叉与合作研究项目(XKJC202402);贺州学院校级科研项目(2023ZDPY01)

Preparation and application of bilayer films from raw or cooked purple sweet potato for monitoring minced pork freshness

XIE Wei1(), DENG Zhonghui2(), YAN Yu1   

  1. 1.College of Food and Biological Engineering,Guangxi Key Laboratory of Health Care Food Science and Technology,Hezhou University,Hezhou 542899,China
    2.School of Artificial Intelligence,Hezhou University,Hezhou 542899,China
  • Received:2024-10-21 Online:2025-09-26 Published:2025-09-22
  • Contact: DENG Zhonghui E-mail:249201676@qq.com;7821968@qq.com

摘要:

采用生或熟的紫薯粉为基材,添加海藻酸钠、二氧化钛和柠檬酸等组分,通过层层自组装技术制备8种不同的双层膜,并进行X射线衍射、扫描电子显微镜、光学性能、力学性能、抗氧化性能、氨气响应、缓释效果和其他性能的评估。结果表明,STNPR膜具有最优的综合性能,其具体参数为不透明度7.18 mm-1,拉伸强度2.93 MPa,断裂伸长率39.2 %,含水率26.78 %,水蒸气透过系数为0.000 3 g/(mm·d),水溶性50.97 %,溶胀率362.99 %,DPPH自由基清除率为56.79 %;将STNPR膜应用于猪肉糜新鲜度监测,在监测过程中,STNPR膜从初始的茄紫红色变为茄紫黑色,最终变为蓝黑色;STNPR膜的颜色变化能够直观反映猪肉糜的质量状态,为消费者提供一个简便可靠的判断依据。

关键词: 紫薯, 二氧化钛, 双层膜, 新鲜度

Abstract:

In this study, a type of bilayer film was fabricated for monitoring minced pork freshness using raw or cooked purple sweet potato powders as the base material, combined with sodium alginate, titanium dioxide, and citric acid, through a layer⁃by⁃layer self⁃assembly technique. Eight distinct film formulations were comprehensively characterized for their structural, optical, mechanical, antioxidant, and ammonia⁃responsive properties, including X⁃ray diffraction, scanning electron microscopy, water vapor permeability, and controlled release performance. Among these, the STNPR film demonstrated optimal overall performance, exhibiting an opacity of 7.18 mm⁻¹, tensile strength of 2.93 MPa, elongation at break of 39.2 %, moisture content of 26.78 %, water vapor permeability of 0.000 3 g/(mm·d), water solubility of 50.97 %, swelling ratio of 362.99 %, and DPPH radical scavenging activity of 56.79 %. When applied to monitor minced pork freshness, the STNPR film displayed a visible color transition from eggplant purple to dark eggplant purple and finally to blue⁃black, correlating with pork quality degradation. This colorimetric response provides a simple, reliable, and visually intuitive method for real⁃time freshness assessment, offering practical utility for consumers.

Key words: purple sweet potato, titanium dioxide, bilayer film, freshness

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