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the bug that eats plastic: bacteria that breaks down bottles and bags could help clean up the planet - pet film manufacturers

by:Cailong     2019-07-04
the bug that eats plastic: bacteria that breaks down bottles and bags could help clean up the planet  -  pet film manufacturers
Millions of non
Biodegradable plastic bottles containing PET or PET are produced every year-
Many people finally throw rubbish on the streets and the sea.
Now Japanese researchers have discovered a bug that "eats" these compounds, offering tempting hope for a cleaner planet in the coming years.
By screening candidates for bacteria who can break down tough substances, they met 201-
It can use pets as its energy source.
PET has a high degree of anti-biodegradable ability, and after 70 years of use, there are a large number of bottles and fibers containing plastic waste sea, town and garbage dump.
It is not broken down because of the lack or low activity of the decomposition metabolic enzyme, it can attack its plastic composition.
Polyester containing a high proportion of ingredients (such as PET) is chemically inert, resulting in antimicrobial degradation.
In the past, only a few fungi could break down pets, but researchers at Keio University in Tokyo have discovered a bacterial hero.
They collected 250 PET fragment samples and screened bacterial candidates that relied on PET films as the primary source of carbon for growth.
The team identified a new bacteria, which they named sakaiensis Ideonella 201-
F6, at a temperature of 30 °c, after six weeks, it can almost completely degrade the PET film (86°F).
A further investigation found an enzyme called ISF6.
4831, it breaks PET into intermediate substances together with water, and then is further decomposed by the second enzyme ISF6-0224.
These two enzymes can break down PET into simpler building blocks.
It is worth noting that the function of these enzymes seems to be unique compared to the relevant known enzymes closest to other bacteria, which has caused people to treat these plastics-
Eating bacteria will evolve.
Yoshida Shosuke of the Department of Biological Sciences and Information at Keio University said: "pet is widely used in plastic products and its accumulation in the environment has become a global concern.
Since the ability of the enzyme to degrade PET is considered limited to a few fungal species, biodegradable is not yet a viable remediation or recovery strategy.
By screening the natural microbial communities exposed to PET in the environment, we isolated a new bacteria-sakaiensis Ideonella 201-
F6, which can use PET as its main energy and carbon source.
When the strain grows on PET, two enzymes capable of hydrolysis of PET and reaction intermediate mono (2-hydroxyethyl)
2 acid of benzene
Both of these enzymes require the efficient conversion of PET enzymes into two organisms that are harmless to the environment-p-benzene diacid and ethylene glycol.
Uwe Bornscheuer, University of Greifswald, Germany, commented on the discovery in the journal Science, saying: "The degradation process is relatively slow --
The complete degradation of a small PET film takes six weeks.
Nevertheless, this discovery may be of great significance to the recycling of pets.
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