Question

what is BHET.what is the use of this

Answer 1

PETases are an esterase class of enzymes that catalyze the hydrolysis of polyethylene terephthalate (PET) plastic to monomeric mono-2-hydroxyethyl terephthalate (MHET). The idealized chemical reaction is (where n is the number of monomers in the polymer chain):[1]

PETase

PETase 5XH3 with HEMT-cartoon.png

Identifiers

EC number

3.1.1.101

Alt. names

PET hydrolase, poly(ethylene terephthalate) hydrolase

Databases

IntEnz

IntEnz view

BRENDA

BRENDA entry

ExPASy

NiceZyme view

KEGG

KEGG entry

MetaCyc

metabolic pathway

PRIAM

profile

PDB structures

RCSB PDB PDBe PDBsum

Search

PMC

articles

PubMed

articles

NCBI

proteins

(ethylene terephthalate)n + H2O → (ethylene terephthalate)n-1 + MHET

Trace amount of the PET breaks down to bis(2-hydroxyethyl) terephthalate (BHET). PETases can also break down PEF-plastic (polyethylene-2,5-furandicarboxylate), which is a bioderived PET replacement. PETases can't catalyze the hydrolysis of aliphatic polyesters like polybutylene succinate or polylactic acid.[2]

Non-enzymatic natural degradation of PET will take hundreds of years, but PETases can degrade PET in matter of days.[3]