Protein time–temperature sensor for intelligent starch polymers

Santos, Carolina Toledo; Veiga‐Santos, Pricila; Sestari, Patricia; Sorrini, Nathalia Carvalho; Roça, Roberto de Oliveira

doi:10.1111/jfpp.14428

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…Compared to other areas, research on time and temperature indicators began late, and there is little relevant research. For example, Carolina and Pricila [ 147 ] added myoglobin extract and nitrite to the thermoplastic sensor film of cassava starch as an alternative to traditional electronic time-temperature sensors. They developed a natural, non-toxic, biodegradable thermochromic protein-based sensor.…”

Section: Starch-based Intelligent Filmsmentioning

confidence: 99%

Recent Advances and Applications in Starch for Intelligent Active Food Packaging: A Review

Liu

Zhao

Chen

et al. 2022

Foods

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At present, the research and innovation of packaging materials are in a period of rapid development. Starch, a sustainable, low-cost, and abundant polymer, can develop environmentally friendly packaging alternatives, and it possesses outstanding degradability and reproducibility in terms of improving environmental issues and reducing oil resources. However, performance limitations, such as less mechanical strength and lower barrier properties, limit the application of starch in the packaging industry. The properties of starch-based films can be improved by modifying starch, adding reinforcing groups, or blending with other polymers. It is of significance to study starch as an active and intelligent packaging option for prolonging shelf life and monitoring the extent of food deterioration. This paper reviews the development of starch-based films, the current methods to enhance the mechanical and barrier properties of starch-based films, and the latest progress in starch-based activity, intelligent packaging, and food applications. The potential challenges and future development directions of starch-based films in the food industry are also discussed.

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Section: Starch-based Intelligent Filmsmentioning

confidence: 99%

Recent Advances and Applications in Starch for Intelligent Active Food Packaging: A Review

Liu

Zhao

Chen

et al. 2022

Foods

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“…investigated the color change of myoglobin as a result of its association with nitrite to form a nontoxic biodegradable temperature sensor. [ 88 ] In their study, myoglobin and nitrite were used as additives in thermoplastic starch films. As myoglobin formed into nitrosyl myoglobin (MbNO) the researchers observed samples change from a red color to a darker red when exposed to constant temperatures of both 100 and 170 °C for 60 min.…”

Section: Green Thermochromic Materialsmentioning

confidence: 99%

“…Santos et al investigated the color change of myoglobin as a result of its association with nitrite to form a nontoxic biodegradable temperature sensor. [88] In their study, myoglobin and nitrite were used as additives in thermoplastic starch films.…”

Section: Proteinsmentioning

confidence: 99%

Green Thermochromic Materials: A Brief Review

Crosby

Netravali

2022

Advanced Sustainable Systems

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common thermochromic systems studied are leuco dyes and pigments, liquid crystalline polymers, and transition metal inorganic complexes. [2,15,[16][17][18][19][20][21][22][23] However, finished thermochromic materials commonly consist of or are incorporated into media that are or contain toxic, hazardous, or nondegradable components. [8,15,24] This limits their usage in applications that can pose the risk of cytotoxicity to the human body, such as food packaging or body temperature sensing devices for infants. Further, such hazardous and nondegradable materials exhibit high levels of persistence in soil as well as water systems and can pollute and disrupt these critical ecological systems. [24][25][26] "Green" thermochromic materials is a new and emerging field of research. Breakthroughs in this field will seek to replace toxic or inorganic materials which dominate the current thermochromic literature and applications with newly developed greener ones. Being a field in its infancy, there has yet to be a body of work that accumulates the current state of research in this field. This brief review seeks to explore and identify the constituent requirements for green materials as well as equip researchers to design thermochromic systems utilizing green chemistry. The history of thermochromism is reviewed in this paper. The mechanisms of thermochromism in common solids, liquids, and mesophases are considered as well as how the mechanistic pathway translates into their current applications. A general distinction between reversible and irreversible thermochromism is also discussed. Recent advances in the emerging field of green thermochromic materials are discussed critically and future applications mentioned.

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“…Intelligent tags are designed to monitor the storage environment of perishable products in a cost-efficient manner . Macroscopic size intelligent tags such as temperature tags − and gas tags − have been widely studied and are constantly reported in recent years. In addition to macroscopic size intelligent tags, microparticles that can report changes in pH or carry encoded information and respond to external stimuli have also been reported.…”

Section: Introductionmentioning

confidence: 99%

An Edible Humidity Indicator That Responds to Changes in Humidity Mechanically

Zhang

Arunachalam

Perrin

et al. 2023

ACS Appl. Polym. Mater.

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Elevated humidity levels in medical, food, and pharmaceutical products may reduce the products' shelf life, trigger bacterial growth, and even lead to complete spoilage. In this study, we report a humidity indicator that mechanically bends and rolls itself irreversibly upon exposure to high humidity conditions. The indicator is made of two food-grade polymer films with distinct ratios of a milk protein, casein, and a plasticizer, glycerol, that are physically attached to each other. Based on the thermogravimetric analysis and microstructural characterization, we hypothesize that the bending mechanism is a result of hygroscopic swelling and consequent counter diffusion of water and glycerol. Guided by this mechanism, we demonstrate that the rolling behavior, including response time and final curvature, can be tuned by the geometric dimensions of the indicator. As the proposed indicator is made of food-grade ingredients, it can be placed directly in contact with perishable products to report exposure to undesirable humidity inside the package, without the risk of contaminating the product or causing oral toxicity in case of accidental digestion, features that commercial inedible electronic and chemo-chromatic sensors cannot provide presently.

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Protein time–temperature sensor for intelligent starch polymers

Cited by 11 publications

References 23 publications

Recent Advances and Applications in Starch for Intelligent Active Food Packaging: A Review

Recent Advances and Applications in Starch for Intelligent Active Food Packaging: A Review

Green Thermochromic Materials: A Brief Review

An Edible Humidity Indicator That Responds to Changes in Humidity Mechanically

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