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Preparation of High-stability Indicator Film Based on Oxalic Acid/Roselle Anthocyanin and Its Application in Monitoring the Freshness of Channel Catfish
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Hongdong DENG, Yang WANG, Chunyan JIANG, Zhengfeng FANG, Teng HUI, Saiyan CHEN*
Science and Technology of Food Industry | 2026, 47(9) : 363 - 369
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Science and Technology of Food Industry | 2026, 47(9): 363-369
• Storage and Preservation •
Preparation of High-stability Indicator Film Based on Oxalic Acid/Roselle Anthocyanin and Its Application in Monitoring the Freshness of Channel Catfish
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Hongdong DENG, Yang WANG, Chunyan JIANG, Zhengfeng FANG, Teng HUI, Saiyan CHEN*
Affiliations
  • College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
Published: 2026-05-01 doi: 10.13386/j.issn1002-0306.2025050181
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This study developed a high-stability indicator film containing a roselle (Hibiscus sabdariffa) anthocyanin extract (RAE)-oxalic acid (OA) co-pigment indicator (RAO), investigated the stability of the RAO indicator and its effects on the structure and performance of the indicator film, and applied the film to monitor the freshness of channel catfish (Ictalurus punctatus). The results showed that the stability of the RAO indicator improved compared with single RAE indicator. Moreover, the film with the RAO indicator showed enhanced performance. The tensile strength and elongation at break of the indicator film increased from 16.10 MPa and 280.95% to 17.81 MPa and 349.45%, respectively. Its moisture content and water solubility decreased from 19.10% and 42.71% to 13.98% and 34.69%, respectively. Under conditions of 4 ℃, 45% humidity, and no light exposure, the RAO indicator film could be stored for up to 82 days (ΔE<5). When used for monitoring the freshness of channel catfish at 4 ℃, the indicator film changed from rose-red to yellow-gray as the fish spoiled, demonstrating its accuracy in monitoring the spoilage process and its great potential for freshness monitoring applications.

roselle anthocyanin  /  oxalic acid  /  co-pigmentation  /  high-stability indicator film
Hongdong DENG, Yang WANG, Chunyan JIANG, Zhengfeng FANG, Teng HUI, Saiyan CHEN. Preparation of High-stability Indicator Film Based on Oxalic Acid/Roselle Anthocyanin and Its Application in Monitoring the Freshness of Channel Catfish[J]. Science and Technology of Food Industry, 2026 , 47 (9) : 363 -369 . DOI: 10.13386/j.issn1002-0306.2025050181
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Year 2026 volume 47 Issue 9
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doi: 10.13386/j.issn1002-0306.2025050181
  • Receive Date：2025-05-21
  • Online Date：2026-05-13
  • Published：2026-05-01
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  • Received：2025-05-21
Affiliations
    College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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