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Time-controlled biodegradation

It is known for a long time that aliphatic polyesters can be hydrolysed by lipases and other hydrolases. As parameters controlling biodegradability different parameters were discussed. The specific structure of the ester bond was supposed to be of importance, but also the hydrophobic-hydrophilic balance in neighbourhood to the ester and thermal properties like the melting point were regarded ". ... [Pg.305]

By far the best solution to the disposal problem is the use of photo-biodegradable self-destruct film which are time controllable in order to be adaptable to the requirements of the specific crops and their cultivation procedures. [Pg.201]

More studies around the application of biodegradable polymers in the enviromnent were carried out, e.g. some polymers have been recognized their potential for the release of insecticide into soil, which could release the chemical at the appropriate time controlled by the time of degrading. Others contributed to the preventing of oil pollution and purification of the denitrifying bacteria in water. In addition, the use of biodegradable polymers for renewable resources was analysed. ... [Pg.366]

In order to control biodegradation of homopolymers, glycolide and lactides are copolymerised. Owing to difference in reactivities of these two dimers, copolymers having broad composition ranges can be produced. Therefore they degrade in vivo by hydrolysis in different periods of time, from weeks to months. PLA/PGA copolymers have also been... [Pg.327]

Ideal performance of biodegradable plastics in agriculture. Eb = elongation at break, IPa,b = time-controlled induction periods during which mechanical and chemical properties do not change. [Pg.458]

Implanted Contraceptives. Controlled release of contraceptive progestins also can be accompHshed by incorporating the dmg into an implantable cylinder or rod. The best known implant is Norplant, developed by the Population Council. Norplant is composed of six matchlike silastic cylinders with the progestogen levonorgestrel (11) incorporated on the inside of each cylinder. After implantation under the skin, the product can provide effective contraception for a period of five years (43,44). Since silastic is not biodegradable, the implant can be removed from a patient at any time. [Pg.118]

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See also in sourсe #XX -- [ Pg.3 ]



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Biodegradation control

Time control

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