El PET, tereftalato
de polietileno, se emplea en la
fabricación de botellas para gaseosas,
agua, jugos y salsas. El
mercado mundial de PET es de alrededor 32 millones de toneladas al año.
Si bien constituye uno de los materiales más reciclados, alrededor de un 30%,
una parte mayoritaria pasa a constituir los residuos plásticos del planeta. En
el reciente artículo “A bacterium that degrades and assimilates poly(ethylene
terephthalate)” publicado en la revista Science vol. 351, Nº 6278, por un equipo dirigido por
Kohei Oda del Instituto de Tecnología de Kyoto y Kenji Miyamoto, de la
Universidad de Keio, Japón, presentan
el descubrimiento de una bacteria que se “alimenta” degradando al PET. La denominaron Ideonella sakaiensis en homenaje a la ciudad donde la
encontraron. La bacteria puede, un solo día,
devorar millones de toneladas métricas
de PET. Es capaz de utilizar el polímero
como su principal fuente de energía y carbono. Cuando se cultiva en PET, esta
cepa produce dos enzimas (PETase y
MHETase) capaces de hidrolizar PET para convertirlo enzimáticamente en sus dos
monómeros ambientalmente benignos, el ácido tereftálico y el etilen glicol. Los
científicos creen que esta maquinaria enzimática de la bacteria algún día podrá
remediar ambientes contaminados con PET y recuperar la materia prima evitando
utilizar nuevamente combustible fósil para la obtención del polímero.
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