CMC and CNF-based intelligent pH-responsive color indicator films integrated with shikonin to monitor fish freshness

被引:112
作者
Ezati, Parya [1 ]
Priyadarshi, Ruchir [1 ]
Bang, Yeong-Ju [1 ]
Rhim, Jong-Whan [1 ]
机构
[1] Kyung Hee Univ, BioNanocomposite Res Ctr, Dept Food & Nutr, 26 Kyungheedae Ro, Seoul 02447, South Korea
基金
新加坡国家研究基金会;
关键词
Carboxymethylcellulose; Cellulose nanofiber; Shikonin; pH-responsive; Color indicator film; AMMONIUM PERSULFATE; FACILE SYNTHESIS; ROOT EXTRACTS; CELLULOSE; WATER; ANTIOXIDANT; CHITOSAN; SPOILAGE; REMOVAL;
D O I
10.1016/j.foodcont.2021.108046
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Intelligent pH-responsive color indicator films based on carboxymethyl cellulose (CMC) and cellulose nanofibers (CNF) were prepared using shikonin extracted from Lithospermum erythrorhizon roots. The addition of shikonin did not affect the thermal stability and water vapor barrier properties of the film; however, the surface hydrophobicity increased significantly. The shikonin-added films showed high antioxidant activity, especially in aqueous solutions. The color indicator films showed a noticeable color response function for various pH values, showed reddish-pink at pH below 7, and turned reddish-purple, purple, and light blue as the pH increased from 7 to 12. When the indicator film was used to monitor the fish freshness, it showed a reddish-pink for fresh fish (pH = 5.7) and turned blue-violet after 36 h, indicating that it was spoiled (pH = 6.9). The shikonin-added color indicator films with a distinct discoloration function between a weak acid and weak alkali are likely to be applied to monitor seafood quality.
引用
收藏
页数:9
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