Development and characterization of hybrid films based on agar and alizarin red S for applications as non-enzymatic sensors for hydrogen peroxide

Soares, Maria de Fátima Cardoso; Farias, Emanuel Airton de Oliveira; Silva, Durcilene Alves da; Eiras, Carla

doi:10.1007/s10853-016-9958-8

Cited by 10 publications

(1 citation statement)

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“…Color indicator films can be fabricated using pH-reactive dyes, where natural dyes have a safety advantage over synthetic dyes. , Various natural colorants such as anthocyanin, alizarin, curcumin, betalain, and shikonin have been used for this purpose. ,,, Among them, alizarin has received a lot of attention from researchers to prepare pH-responsive color indicator smart packaging films due to its distinct color change depending on the pH and stability of the pigment. − Alizarin, 1,2-dihydroxyanthraquinone, is mainly derived from the root of madder plants . Alizarin has a color indicating function from yellow to red to purple depending on the pH with UV protection and antioxidant functions .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Carboxymethyl Cellulose/Agar-Based Functional Films Hybridized with Alizarin and Grapefruit Seed Extract

Roy

Rhim

2021

ACS Appl. Bio Mater.

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Carboxymethyl cellulose/agar-based functional halochromic films were fabricated by adding alizarin and grapefruit seed extract (GSE). The fillers were evenly dispersed in the polymer matrix to form compatible composite films. The addition of alizarin has improved the film's mechanical strength (20%) and water resistance (40%) with potent antioxidant and excellent color indicating properties. In contrast, GSE has imparted strong antibacterial and antioxidant activities to the film. Also, the addition of alizarin and GSE slightly improved the water vapor barrier properties but did not affect the thermal stability of the film. The composite film also exhibited UV blocking properties with adequate transparency. The composite film showed an excellent pH-dependent color change with color reversibility and color stability and a volatile gas detection function. The film also showed potent antimicrobial activity against foodborne pathogenic bacteria, Escherichia coli and Listeria monocytogenes, and showed an intense antioxidant action.

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