Modifying Properties of Feather Keratin Bioplastic Films Using Konjac Glucomannan

Strnad, Simona; Design,; Oberhollenzer, Zala; Šauperl, Olivera; Kreže, Tatjana; Zemljič, Lidija Fras; Oberhollenzer, Hauptplatz Zala; Deutschlandsberg, Austria

doi:10.35812/cellulosechemtechnol.2019.53.100

Cited by 9 publications

(7 citation statements)

References 39 publications

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“…Furthermore, the properties of KC/c-KGM remain [30] Gelatin/KGM, [44] Ethyl cellulose (EC) /KGM, [46] Agar/KGM, Carrageenan (CA)/Xanthan (XA)/KGM, Silver Nanowire (Ag)/KGM, and Keratin (KE)/KGM. [58] relatively stable throughout the immersion period. This suggests that KC/c-KGM might be more resistant to the penetration of water molecules, which could potentially weaken the material strength.…”

Section: Fabrication and Characterization Of C-kgm And Kc/c-kgmmentioning

confidence: 91%

“…Comparison between the c-KGM in this study and other c-KGM-based materials from previous studies with respect to: e) elongation at break and (f ) Young's modulus. Previous c-KGM-based materials are denoted as: Calcium hydroxide Ca(OH) 2 /KGM,[30] Gelatin/KGM,[44] Ethyl cellulose (EC) /KGM,[46] Agar/KGM, Carrageenan (CA)/Xanthan (XA)/KGM, Silver Nanowire (Ag)/KGM, and Keratin (KE)/KGM [58].…”

mentioning

confidence: 99%

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Edible Soft Actuators Based on Konjac Glucomannan for Underwater Operation

Kanno,

Kwak,

Pankhurst

et al. 2024

Advanced Intelligent Systems

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Soft robots are being increasingly developed and deployed for underwater applications such as exploration, monitoring, and rescue owing to their innate compliance, mechanical and chemical stability, and waterproof properties. However, they are still predominantly manufactured using silicones and acrylic elastomers, which pose environmental risks due to their limited biodegradability. To tackle this issue, a method for manufacturing water‐resistant, liquid‐driven soft actuators made from a novel type of konjac glucomannan (KGM) is presented, which is plant‐derived, insoluble, and edible. The material offers impressive stretchability, reaching up to 67.2% of its initial length, surpassing previous related work, and withstands over a 1000 cycles of tensile stress. Using this material, we develop soft actuators that can bend up to 47.1°, and the maximum blocking force of 0.1 N is achieved with a pressure input of 20 kPa. A gripper that is capable of grasping various objects underwater is also evaluated. In essence, this article introduces a sustainable and environmentally friendly alternative to conventional soft robotic materials, paving the way for innovative and eco‐conscious underwater applications. The utilization of edible, water‐resistant materials like konjac provides a promising solution to reduce pollution and mitigate negative environmental impacts associated with traditional underwater soft robots.

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Section: Fabrication and Characterization Of C-kgm And Kc/c-kgmmentioning

confidence: 91%

mentioning

confidence: 99%

Edible Soft Actuators Based on Konjac Glucomannan for Underwater Operation

Kanno,

Kwak,

Pankhurst

et al. 2024

Advanced Intelligent Systems

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show abstract

“…Finally, animal-based byproducts that are rich in keratin, such as chicken feathers − and sheep wool, ,− have been intensively studied and successfully valorized by the production of bioplastics, due to the high stability and low water solubility of keratinaceous materials that are rich in the amino acid cysteine, allowing numerous disulfide bonds and extensive cross-linking that are resistant to water, weak acids, and organic solvents. Yet, as mentioned previously, the extraction of keratin from biowaste requires harsh treatments that might compromise its functionality and performance, while dramatically decreasing its average molecular weight, thus setting a limit for various applications.…”

Section: Upgrading Food Protein Waste Beyond the Food-value Chainmentioning

confidence: 99%

Turning Food Protein Waste into Sustainable Technologies

et al. 2022

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For each kilogram of food protein wasted, between 15 and 750 kg of CO2 end up in the atmosphere. With this alarming carbon footprint, food protein waste not only contributes to climate change but also significantly impacts other environmental boundaries, such as nitrogen and phosphorus cycles, global freshwater use, change in land composition, chemical pollution, and biodiversity loss. This contrasts sharply with both the high nutritional value of proteins, as well as their unique chemical and physical versatility, which enable their use in new materials and innovative technologies. In this review, we discuss how food protein waste can be efficiently valorized not only by reintroduction into the food chain supply but also as a template for the development of sustainable technologies by allowing it to exit the food-value chain, thus alleviating some of the most urgent global challenges. We showcase three technologies of immediate significance and environmental impact: biodegradable plastics, water purification, and renewable energy. We discuss, by carefully reviewing the current state of the art, how proteins extracted from food waste can be valorized into key players to facilitate these technologies. We furthermore support analysis of the extant literature by original life cycle assessment (LCA) examples run ad hoc on both plant and animal waste proteins in the context of the technologies considered, and against realistic benchmarks, to quantitatively demonstrate their efficacy and potential. We finally conclude the review with an outlook on how such a comprehensive management of food protein waste is anticipated to transform its carbon footprint from positive to negative and, more generally, have a favorable impact on several other important planetary boundaries.

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“…The process of biodegradation has two distinct phases. 99 Both abiotic processes and extracellular enzymatic assault shorten and break down polymer chains in the first stage; enzymes more readily break down less structured amorphous areas of plastic. Hence, a plastic's crystallinity will rise quickly before plateauing at around 100%.…”

Section: Biodegradability and Recyclability Of Bioplasticmentioning

confidence: 99%