Chloe Zhang
Keratin is a sustainable and abundant biopolymer that has been explored for its potential in association with other synthetic, biosynthetic, and natural polymers. One of the challenges in working with keratin is that it is a heavily cross-linked protein, which makes it difficult to process and often results in brittle films. However, recent innovations have combined known keratin extraction methods with the Michael addition process to create a fully bio-based soy oil-keratin plastic that shows promise as a sustainable bioplastic. This development could lead to a new route for creating supple, moldable materials from keratin, which is a tough protein found in feathers, horns, and wool. The successful creation of bioplastics from keratin has the potential to revolutionize the plastic industry by providing a sustainable alternative to traditional plastics and addressing the environmental challenges posed by their production and disposal.
Explore related products
What You'll Learn
- Keratin is a polymer, but not all polymers are plastics
- Keratin can be converted into flexible thermoplastic
- Keratin-based bioplastics can be used in biomedical applications and food containers
- Keratin derivatives are easily purified and don't use toxic reactants
- Keratin-based bioplastics can be made from chicken feathers and cellulose
Keratin is a polymer, but not all polymers are plastics
Keratin is a natural polymer that is abundant in animal-based biopolymers. It is found in hair, wool, and nails, and is derived from the side-stream products of the cattle, ovine, and poultry industries. Keratin is a hard-degrading fibrous protein, insoluble in water and organic solvents.
Although keratin is a polymer, not all polymers are plastics. Polymers may be plastic physically, but not necessarily chemically. Keratin, for example, can be used to create plastic films, but it is not chemically a plastic. Keratin films are plasticized with additives such as glycerol and sodium dodecyl sulphonic acid (SDS), which gives them a hydrophobic character. These bioplastic keratin films have been explored for their suitability in packaging applications, as they absorb UV light.
The process of creating these bioplastics involves the extraction of keratin through oxidation and reduction procedures. The oxidized form of keratin is called keratose, while the reduced form is kerateine. These derivatives are then used to create plastic films, fibers, sponges, hydrogels, and composites.
The structure of keratin bioplastic membranes can be analyzed using techniques such as X-ray diffraction and Fourier-Transform Infrared Spectroscopy, which provide information about the material's crystalline structure and infrared spectrum, respectively.
In summary, while keratin is a polymer, not all polymers are chemically classified as plastics. Keratin's ability to form plastic films is due to its physical properties and the addition of plasticizers, but its chemical composition is distinct from that of plastics.
Creative Ways to Dye Plastic Easter Eggs
You may want to see also
Explore related products
Keratin can be converted into flexible thermoplastic
Keratin is a protein that forms feathers, horns, and wool. It is one of the most abundant biopolymers from animal sources and is a promising sustainable raw material for bioplastics. However, keratin typically results in brittle films, and processing it is challenging due to its heavily cross-linked structure.
To address this issue, researchers have developed a novel transformation technology that utilizes a water-based extraction process coupled with Michael-type addition chemistry. This process unfolds the keratin and grafts building blocks onto it, reprogramming its structure. By using poly(ethylene glycol) methyl ether methacrylate, the keratin can be transformed into a thermoplastic. Alternatively, using poly(ethylene glycol) dimethacrylate results in a fully bio-based, flexible, and tough material that outperforms other regenerated keratin materials.
The PEG-keratin material can be heated and shaped like a thermoplastic, while the soy oil–keratin material can be made into flexible films. These keratin-based bioplastics have high structural strength, good crystallinity, and appropriate morphologies without edges, holes, or cavities.
The development of keratin-based bioplastics offers a sustainable strategy for converting low-value waste into valuable materials. This approach could provide key enabling technologies for circular systems where keratin-based materials are used in industries that generate keratin waste, such as the food industry, closing the loop on waste and creating a more sustainable future.
The Periodic Table's Plastic Problem
You may want to see also
Explore related products
Keratin-based bioplastics can be used in biomedical applications and food containers
Keratin-based bioplastics are an emerging innovation with promising applications in the biomedical field and beyond. Derived from keratin, an insoluble fibrous protein found in human and animal sources like hair, wool, and feathers, these bioplastics possess unique characteristics that make them versatile and functional.
In the realm of biomedical applications, keratin-based bioplastics offer a range of advantages. One of their most notable features is their biodegradability, which aligns with the growing demand for eco-friendly alternatives in various industries, including healthcare. This quality, combined with excellent biocompatibility, makes keratin-based biomaterials ideal for wound healing applications. The ability of these bioplastics to support cell growth and proliferation further enhances their potential in tissue regeneration, particularly in oral and nerve regeneration. Additionally, keratin-based bioplastics can be loaded with drug molecules, antibiotics, and growth factors, making them effective drug delivery systems.
The versatility of keratin-based bioplastics extends beyond the biomedical domain. Their unique properties make them a viable option for food containers and packaging applications. The development of these bioplastics with high structural strength, good crystallinity, and the ability to absorb UV light makes them attractive for packaging solutions. This is particularly relevant in the context of food safety, where the presence of pathogens in traditional packaging can be a significant concern. By leveraging the antimicrobial functions of keratin-based bioplastics, the growth and development of harmful microorganisms can be mitigated, enhancing food safety and shelf life.
Furthermore, the protein-based nature of keratin bioplastics sets them apart from traditional petroleum-based plastics. Keratin, as a raw material, can be derived from both plant and animal sources, contributing to the diversity and sustainability of the bioplastics created. This renewable aspect of keratin-based bioplastics aligns with the growing environmental consciousness driving the market's search for eco-friendly alternatives. The current bioplastic market, while still a small fraction of the plastic packaging industry, is expanding due to increasing demand and a focus on research and development.
In conclusion, keratin-based bioplastics showcase an array of desirable characteristics that make them well-suited for biomedical applications and food containers. Their biodegradability, biocompatibility, and antimicrobial properties, coupled with their structural strength and UV-absorbing capabilities, present a compelling case for their adoption in these sectors. As research progresses and the demand for sustainable alternatives intensifies, keratin-based bioplastics have the potential to revolutionize biomedical technologies and contribute to a greener future.
Plastic Pollution: Understanding the Devastating Impact
You may want to see also
Explore related products
Keratin derivatives are easily purified and don't use toxic reactants
Keratin is a protein that occurs naturally in epithelial cells and is essential for normal tissue structure and function. The term 'keratin' covers all intermediate filament-forming proteins with specific physicochemical properties produced in any vertebrate epithelia. Keratin helps form hair, nails, and skin. Keratin derivatives are obtained in high yields, are easily purified, and do not use toxic reactants or residues.
The process of deriving keratin involves an alkaline mild oxidative method that splits disulphide (-S-S-) bonds. The native structure of the keratin macromolecules is partially modified upon extraction, as revealed by the decrease of the β-sheet to α-helices/coils ratio. However, high molecular weight fractions (31, 22, and 13 KDa) are retained, permitting film formation and plastic behaviour. These keratin derivatives are then analysed, and their water solutions are used to prepare tough, plasticised, and cross-linked films.
The films are characterised morphologically, optically, and mechanically. The spectroscopic analyses revealed that these bioplastic films absorb UV light, which is interesting for packaging applications. The water content in the films depends on the relative humidity (RH), being able to absorb up to 35 wt% H2O at an ambient of 80% RH.
Keratin derivatives have been deemed safe for use in cosmetics and personal care products. The Expert Panel for Cosmetic Ingredient Safety reviewed the safety of eight keratin-derived ingredients and concluded that they are safe at current practices of use and concentration. Additionally, hydrolysed keratin derived from sheep wool was found to be non-toxic in oral and intravenous studies in rats and mice, respectively.
Overall, the purification process of keratin derivatives is straightforward and does not involve toxic reactants, making them a promising material for various applications, including bioplastics and cosmetics.
Joining Pallets: A Guide to Combining Plastic Pallets
You may want to see also
Explore related products
$1195
Keratin-based bioplastics can be made from chicken feathers and cellulose
Chicken feathers contain up to 90% protein, which is mostly made up of a substance called keratin. Keratin is a source of hydrophobic amino acids such as cysteine, arginine, and threonine. It is naturally hydrophobic, biocompatible, and biodegradable. The production of biodegradable materials using keratin protein from chicken feathers can be an effective way to produce environmentally friendly materials.
Keratin-based bioplastics can be made from chicken feathers. The feathers are treated with an alkaline agent (NaOH) to extract the keratin, which is then mixed with polyvinyl alcohol (PVA) and glycerol to synthesize protein-based bioplastics. This process is known as the casting method. The addition of chitosan as a filler increases the crystallinity of the bioplastic samples, which is inversely proportional to the tensile strength of the bioplastics.
The keratin-based bioplastics developed through this process have high structural strength and good crystallinity, making them suitable for various applications, including biomedical uses and food containers. The biodegradation of these bioplastics was analysed by burying them in the soil, and it was found that the addition of chitosan reduced the degradation time.
Furthermore, these keratin-based bioplastics can be improved by blending them with microcrystalline cellulose. The addition of cellulose increases the cross-linking efficiency at higher temperatures and improves the thermal behaviour, strength, composition, crystallinity, and morphology of the bioplastic films. The use of keratin from chicken feathers in bioplastics serves the dual purpose of addressing feather waste pollution and incorporating it into sustainable applications.
The Perfect Textured Finish for Your Plastic Side Steps
You may want to see also
