Plasticizers for Protein-Based Materials | Request PDF
Glycerol has been shown to be one of the most effective plasticizers for proteins [28] and the glycerol content used here has been used favorably on other protein-based materials, including soy
The effect of plasticizers on the functional properties
Glycerols are often cited as good plasticizers for protein-based materials due to their ability to reduce intermolecular hydrogen bonding while increasing intermolecular spacing. As a small hydrophilic molecule which could be inserted between protein chains, it acts as a plasticizer.
Effect of Plasticizer Content on the Structure and Properties
The methods commonly used to prepare soy protein plastics are hot pressing and extrusion [21, 22]. SPI has good biodegradability, but it is sensitive to water and brittle and easy to break, which limits the application of SPI material, so it needs to be plasticized [23, 24]. Glycerol is the most commonly used plasticizer for protein materials.
Plasticizers for Protein‐Based Materials
There are numerous reports on plasticized protein‐based films, including matrices from plants such as soy, pea, sunflower, and wheat proteins and zein [5]. Animal‐based protein matrices include sodium caseinate, keratin, gelatin, collagen, and whey and myofibrillar proteins.
Progress in bio-based plastics and plasticizing modifications
3.4. Protein based plastics Proteins are renewable, biodegradable and optically active natural 143 polymers produced by animals, plants and bacteria. Until recently proteins have been utilized exclusively in the food industries. Recent studies on non-food uses of agricultural feedstock initiated an interest in protein based plastics as well.
- Are polyols a good plasticizer for protein based materials?
- Polyols are often cited as good plasticizers for protein based materials , , , due to their ability to reduce intermolecular hydrogen bonding while increasing intermolecular spacing. Then, the mechanical properties of caseinate films were studied versus plasticizer type and content in the film.
- Are glycerols a good plasticizer for protein based materials?
- Glycerols are often cited as good plasticizers for protein-based materials due to their ability to reduce intermolecular hydrogen bonding while increasing intermolecular spacing. As a small hydrophilic molecule which could be inserted between protein chains, it acts as a plasticizer.
- What is the aqueous mixture of protein and plasticizer?
- Aqueous mixture of protein (5% w/v) and plasticizer (plasticizer/protein ratios = 25%, 50% and 100% w/w, respectively) was magnetically stirred at 800 rpm for ∼12 h at room temperature in order to get a homogeneous solution.
- Are plasticized protein films better than natural polymers?
- As a general rule for synthetic as well as natural polymers, an increase in plasticizer content lead to higher elongation and lower tensile strength. Nevertheless, plasticized protein films present two important drawbacks: first, extensible films from NaCAS exhibit rather low stresses at break, inferior to that of synthetic polymers.
- Why are plasticizers used in biopolymers?
- Plasticizers are molecules of low volatility which are added to biopolymer materials to allow the modification of the functional properties of films by increasing their extensibility, dispensability, flexibility, elasticity, rigidity and mechanical properties (Hanani et al., 2014a, Hanani et al., 2014b).
- Which polyol-type Plasticizers improve mechanical properties?
- Among the different polyol-type plasticizers tested, glycerol (Gly) and triethanolamine (TEA) were the most efficient for the improvement of mechanical properties (high strains for low stresses).
