Fabrication of a “progress bar” colorimetric strip sensor array by dye-mixing method as a potential food freshness indicator

Active modulation of reflective structural colors

“…In addition, the authors confirmed that the plasmonic platform offered enhanced speeds compared to that of a bare film, similar to the results by Xu et al 86 This was attributed to the increased surface area of the polymer and enhanced ion transport from the increased porosity of the polymer due to the underlying positive curvature of the Au protrusions. The resultant devices showed switching speeds up to 12 to 22 ms, beyond standard video rates, and displayed prolonged switching cycles (410 7 ).…”

“…The operational principles in these alternative display technologies may also be used in smart color labels, where a colored state changes in response to external stimuli such as humidity, gas, light, etc. Owing to the ability to convey information intuitively through simple color variations, reflective colorimetric labels find use in a wide range of areas including hazard detection, 3 food quality monitoring, [4][5][6][7][8] air quality evaluation, 9 etc.…”

Effect of anthocyanin indicator addition on cellulose nanocrystals/gellan gum‐based intelligent packaging films

“…In order to enhance the color rendering ability, expand the color rendering range, and improve the problems of small discoloration interval and low sensitivity of a single dye, many reports put forward the scheme of preparing indicator films by combining multiple pigments and trying to monitor and feedback food quality more accurately (Chen et al, 2018;Kuswandi & Nurfawaidi, 2017;Shao et al, 2021;Wang, Huang et al, 2022). However, chemical dyes are not safe in food applications for human health and can cause potential environmental issues (Guo et al, 2021).…”

“…Chemical dyes have been widely studied and applied, such as methyl red, dimethyl yellow, bromocresol purple, bromophenol blue, bromophenol green, and bromothymol blue (Liu et al, 2020; Romero et al, 2021; Shao et al, 2022; Sun et al, 2015; Wang et al, 2014; Zhang & Lim, 2018). In order to enhance the color rendering ability, expand the color rendering range, and improve the problems of small discoloration interval and low sensitivity of a single dye, many reports put forward the scheme of preparing indicator films by combining multiple pigments and trying to monitor and feedback food quality more accurately (Chen et al, 2018; Kuswandi & Nurfawaidi, 2017; Shao et al, 2021; Wang, Huang et al, 2022). However, chemical dyes are not safe in food applications for human health and can cause potential environmental issues (Guo et al, 2021).…”