[9] A great disadvantage of the step-wise polymerization via condensation of an acid and an alcohol is the need to continuously remove water from this system in order to drive the equilibrium of the reaction forward. Scaffolds and films with gelatin allow for the scaffolds to hold drugs and other nutrients that can be used to supply to a wound for healing. Cellulose and starch , proteins and peptides , and DNA and RNA are all examples of biopolymers, in which the monomeric units, respectively, are sugars , amino acids , and nucleotides . biocompatibility, biodegradability, good mechanical properties etc. Biodegradable polymers tend to consist of ester, amide, or ether bonds. Newer biologically compatible synthetic and natural biodegradable polymers have been developed; these include polyglycolide, polylactide, polyhydroxobutyrate, chitosan, hyaluronic acid, and hydrogels. Polyhydroxyalkanoatesas an example, have a degradation period for up to three to six months. [6] There is also significant effort to replace materials derived from petrochemicals with those that can be made from biodegradable components. [2] Chitosan has many excellent characteristics for biomedical science. Chelation is when binding sites along the polymer chain bind with the metal in the water forming clelates. Biopolymers are biodegradable, and some are also compostable. Biodegradable polymers are of significant interest to a variety of fields including medicine,[21] agriculture,[22] and packaging. One of the most important and most studied groups of biodegradable polymers are polyesters. These films can carry things like antioxidants, enzymes, probiotics, minerals, and vitamins. Polymers are of two types: naturally occurring and synthetic or man made.. Natural polymeric materials such as hemp, shellac, amber, wool, silk, and natural rubber have been used for centuries. [9] In Europe there is a home composting standard and associated logo that enables consumers to identify and dispose of packaging in their compost heap. Compared to the traditional deposition way, the biodegradation for polymer has a longer degradation period. All biodegradable polymers should be stable and durable enough for use in their particular application, but upon disposal they should easily break down. The drug slowly releases as polymer degrades. There are vast examples and applications of biodegradable polymers. Biopolymers will break down, and some are suitable for domestic composting.[8]. [2] These microorganisms normally take polymer fragments, such as oligomers or monomers, into the cell where enzymes work to make adenosine triphosphate (ATP) and polymer end products carbon dioxide, nitrogen gas, methane, water, minerals, and biomass. Leachables and extractables are extremely low. Polymer properties that influence degradation are bond type, solubility, and copolymers among others. A polymer (/ ˈpɒlɪmər /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits. Biodegradable polymers are a special class of polymer that breaks down after its intended purpose by bacterial decomposition process to result in natural byproducts such as gases (CO2, N2), water, biomass, and inorganic salts. These polymers have the distinct advantage that over time they will break down. [citation needed] A low degree of polymerization is normally seen, as hinted at above, as doing so allows for more accessible end groups for reaction with the degradation initiator. [2] The first involves aerobic biodegradation, where oxygen is present and important. One of the most commonly used polymers for packaging purposes is polylactic acid, PLA. Nano fibers and microfibers can be added to the polymer matrix to increase the mechanical properties of starch improving elasticity and strength. For tissue engineering and wound treatment applications, the mechanical properties of the polymeric material have … A variety of other natural polymers exist, such as cellulose, which is the main constituent of wood and paper.. There are numerous organisms that have the ability to break down natural polymers. [citation needed] Typically, after physical processes carry out the initial breakdown of the polymer, microorganisms will then take what is left and break down the components into even simpler units. There are three main classes of biopolymers, classified according to the monomers used and the structure of the biopolymer formed: polynucleotides, polypeptides, and polysaccharides. ( or potentially infectious ) materials can necessitate harsh reaction conditions and long reaction times resulting. 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