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

Ezati, Parya; Priyadarshi, Ruchir; Bang, Yeong‐Ju; Rhim, Jong‐Whan

doi:10.1016/j.foodcont.2021.108046

Cited by 97 publications

(48 citation statements)

References 44 publications

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“…The antioxidant activity of chitosan has been reported previously and is attributed to the protonated amine group, which stabilizes the free radicals [53]. Additionally, the higher activity against ABTS compared to DPPH occurredbecause hydrophilic chitosan interacts better with ABTS, due to its aqueous solution, than with the methanolic DPPH solution [51]. With the addition of ZnONPs, no variation in the antioxidant activity was detected.…”

Section: Antioxidant Activitysupporting

confidence: 52%

“…Despite this, all the films displayed substantial increments in the WCA values. However, the films could not be classified as hydrophobic as the WCA values were not above 65 • , which is the recommended WCA value for hydrophobic films [51]. Nevertheless, the PLN/CTS/PPS films exhibited a WCA value of 64.6 • , making them the most hydrophobic of their counterparts.…”

Section: Water Vapor Permeability (Wvp) and Water Contact Angle (Wca)mentioning

confidence: 98%

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Development of Multifunctional Pullulan/Chitosan-Based Composite Films Reinforced with ZnO Nanoparticles and Propolis for Meat Packaging Applications

Roy

Priyadarshi

Rhim

2021

Foods

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Pullulan/chitosan-based multifunctional edible composite films were fabricated by reinforcing mushroom-mediated zinc oxide nanoparticles (ZnONPs) and propolis. The ZnONPs were synthesized using enoki mushroom extract and characterized using physicochemical methods. The mushroom-mediated ZnONPs showed an irregular shape with an average size of 26.7 ± 8.9 nm. The combined incorporation of ZnONPs and propolis pointedly improved the composite film’s UV-blocking property without losing transparency. The reinforcement with ZnONPs and propolis improved the mechanical strength of the pullulan/chitosan-based film by ~25%. Additionally, the water vapor barrier property and hydrophobicity of the film were slightly increased. In addition, the pullulan/chitosan-based biocomposite film exhibited good antioxidant activity due to the propolis and excellent antibacterial activity against foodborne pathogens due to the ZnONPs. The developed edible pullulan/chitosan-based film was used for pork belly packaging, and the peroxide value and total number of aerobic microorganisms were significantly reduced in meat wrapped with the pullulan/chitosan/ZnONPs/propolis film.

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Section: Antioxidant Activitysupporting

confidence: 52%

Section: Water Vapor Permeability (Wvp) and Water Contact Angle (Wca)mentioning

confidence: 98%

Development of Multifunctional Pullulan/Chitosan-Based Composite Films Reinforced with ZnO Nanoparticles and Propolis for Meat Packaging Applications

Roy

Priyadarshi

Rhim

2021

Foods

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“…Normally, food packaging does not have an excessively high swelling ratio as this affects food in humid environments. The highest MS (77.78%) in this study was lower than that of other indicator films such as cellulose nanofiber‐based indicator film (287.60%; Ezati et al., 2021) and chitosan‐based indicator film (175.00%; Yan et al., 2021). The different MS may be due to different film‐forming substrates and different interactions during film forming.…”

Section: Resultscontrasting

confidence: 59%

Preparation of pH‐indicator films based on soy protein isolate/bromothymol blue and methyl red for monitoring fresh‐cut apple freshness

Ran

Wang

et al. 2021

Journal of Food Science

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Intelligent pH-indicator films based on soy protein isolate (SPI) were prepared using pH-sensitive dyes (bromothymol blue and methyl red). The addition of mixed indicators imparts pH-indicator films with an appreciable microstructure, acceptable water resistance, and favorable optical properties. The incorporation of the mixed indicators did not lead to significant improvement in the mechanical properties of films due to weak ionic cross-linking by hydrogen bonding between the SPI macromolecules and low-molecularweight indicators. Fourier-transform infrared spectroscopy indicated hydrogen bond-mediated intermolecular interactions, and scanning electron microscopy showed that BB/MR were well dispersed in the SPI film. The indicator addition hindered the sorption and passage of water molecules. The water vapor permeability, moisture sorption, moisture content, and total soluble matter were 4.32 to 6.12 ×10 -12 g⋅cm/cm 2 ⋅s⋅Pa, 36.70% to 73.33%, 25.28% to 44.11%, and 8.21% to 25.56%, respectively. Also, the addition of indicators reduced UV light transmittance with minimal effect on the transparency of the film. The presence of indicators enhanced the pH sensitivity, seen as a visible color reaction at different pHs (total color difference, ΔE > 5). When the pH-indicator film containing 8 ml/100 ml final film emulsions was used to monitor the fresh-cut apple freshness, a green color for fresh status was observed, which turned blue after 60 h. Collectively, our findings suggested that indicator-containing SPI films have the potential for monitoring the freshness of fruits.Practical Application: pH-indicator films can help consumers to identify the freshness of packaged food by a change in the color of the packaging material, which is easily visible to the unaided eye without the need for opening the packaging. This protects consumers' interests.

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“…These biopolymers are emerging as an alternative to nonbiodegradable synthetic plastics to develop biodegradable food packaging materials. However, the application of carbohydrate-based films has been limited because of their poor physical and functional properties, such as antioxidant and antibacterial activity . Efforts have been made to improve the properties of biopolymer films and impart additional functional properties such as antibacterial and antioxidant activity by using various methods such as blending polymers or mixing functional materials to overcome the problems of carbohydrate-based films.…”

Section: Introductionmentioning

confidence: 99%

Starch and Agar-Based Color-Indicator Films Integrated with Shikonin for Smart Packaging Application of Shrimp

Ezati

Rhim

2021

ACS Food Sci. Technol.

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Shikonin extracted from Lithospermum erythrorhizon was employed to develop pH-indicating biodegradable starchand agar-based films using a solution casting method. The Fourier-transform infrared spectroscopy results confirmed shikonin was incorporated successfully into the biopolymers. The addition of shikonin increased the film properties such as UV-light barrier, mechanical strength (7 and 3%), and water vapor permeability (25 and 18%) of the starch/agar-based film. In addition, the shikoninadded composite film showed potent antioxidant activity and some antibacterial activity (Listeria monocytogenes). The composite film displayed excellent color change properties from red to blue in buffered or gaseous environments at various pH values. In addition, the indicator film exhibited a sensitive and rapid color change when exposed to ammonia vapor. When used in shrimp packaging, the film shows a distinctive color change from reddish-pink to blue-violet, indicating the onset of shrimp spoilage. This study provides a way to design a commercial intelligent pH indicator that can meet the reference aspect according to the standards and requirements of the food industry.

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

Cited by 97 publications

References 44 publications

Development of Multifunctional Pullulan/Chitosan-Based Composite Films Reinforced with ZnO Nanoparticles and Propolis for Meat Packaging Applications

Development of Multifunctional Pullulan/Chitosan-Based Composite Films Reinforced with ZnO Nanoparticles and Propolis for Meat Packaging Applications

Preparation of pH‐indicator films based on soy protein isolate/bromothymol blue and methyl red for monitoring fresh‐cut apple freshness

Starch and Agar-Based Color-Indicator Films Integrated with Shikonin for Smart Packaging Application of Shrimp

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