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1

Enzymes involved in polymer biodegradation

100%
Nowak B., Pajak J., Plociniczak T., Labuzek S.
Biotechnologia
|
2008
|
issue 1
45-52
EN
Most widely used plastics are considered to be resistant to environmental factors. Degradation of most popular packaging polymer is slow and may take hundreds of years. To enhance their environmental degradation a number of different approaches, among them copolymerisation or compounding with additives susceptible to environmental factors such as polyesters are used. Enzymes involved in decomposition of polyesters are mainly hydrolases f.ex. esterases, lipases, cutinases. Research team in the Department of Biochemistry is working on polyethylene and poly(ethylene terephtalate) films modified with synthetic aliphatic polyester Bionolle? and mechanisms of their biodegradation using fungal extracellular hydrolytic enzymes.
2

Biodegradable packaging materials

100%
Leszczynski W.
Biotechnologia
|
1999
|
issue 2
50-64
EN
The amount of synthetic wastes has been increasing all around the world, including Poland. Used packages cause serious economic and environmental problems because they are hardly degradable, long-life products. New packing materials have been developed which are biodegradable under natural conditions. They are based on synthetic polymers as well as microbial, plant and animal origin polymers. Chemically synthetic biodegradable materials include: polycaprolactone, polylactic acid and polyvinyl alcohol. Microbial plastics include: bacterial polyhydroxyacid alkanoates and pullulan. Plant and animal polymers include: proteins, alginate, cellulose and starch and its derivates. New packaging materials usually contain starch which facilitates biodegradation. High proportion of starch decreases the mechanical properties of the material, while low starch content reduces its capacity of biodegradation. Studies are carried out on the use of thermoplastic starch (destructured during extrusion) for biodegradable materials in which it occurs alone or in combination with different synthetic polymers.
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