FOOD SCIENCE ›› 2019, Vol. 40 ›› Issue (13): 267-273.doi: 10.7506/spkx1002-6630-20180706-083

• Packaging & Storage • Previous Articles     Next Articles

Development and Application of Intelligent Indicator Films Using Blended Film-Forming Solutions Combined with Purple Sweet Potato Anthocyanins

JIANG Guangyang, XIAO Liyuan, WANG Zhangying, CHEN Anjun, WU Hejun, ZHANG Zhiqing   

  1. 1. College of Food Science, Sichuan Agricultural University, Ya’an 625014, China;2. Crops Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510000, China
  • Online:2019-07-15 Published:2019-07-23

Abstract: Intelligent indicator films were prepared by using binary combinations of starch (S), carboxymethyl cellulose (CMC), and konjac glucomannan (KGM) as film-forming agents and anthocyanins from purple sweet potato (P) as a freshness indicator. The mechanical properties, moisture content, aqueous solubility, microstructure, compatibility, and stability of the intelligent indicator films were determined and compared, and their application for detecting fish freshness was assessed. The results showed that the starch/CMC composite film had the highest tensile strength (15.39 ± 1.15) MPa, the lowest water content (24.17 ± 1.21)%, and the best stability of color. The KGM/CMC film had the best elongation (44.79 ± 1.43)%. Scanning electron microscopic examination showed that the microstructure of these films varied greatly, and the cross section of the starch/CMC composite film was smooth and tight. Furthermore, the starch/CMC film was used to identify the freshness of fish stored at 25 ℃. The total volatile basic nitrogen (TVB-N) content was 15.2 mg/100 g after 24 h, indicating the occurrence of fish spoilage. At the same time, the color of the intelligent indicator film was light red and eventually changed into light blue after 48 h. These results indicate that the starch/CMC film is more suitable for freshness detection, and purple sweet potato anthocyanins show promise for developing stable indicator films.

Key words: intelligent indicator film, purple sweet potato anthocyanins, potato starch, carboxymethyl cellulose, konjac glucomannan

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