Biodegradation of phthalate esters by newly isolated Rhizobium sp. LMB-1 and its biochemical pathway of di-n -butyl phthalate

Abstract

This is the first report concerning the complete degradation of phthalate esters by Rhizobium sp.

Biochemical Pathways and Enhanced Degradation of Dioctyl Phthalate (DEHP) by Sodium Alginate Immobilization in MBR System

“…We speculate the degration pathway of DEHP by SAS-7 was as follows: the 3-4 bit carbon chain of DEHP was shortened and decomposed into DBP to further generate DEP, and then DEP was gradually transformed into PA through deesterification. The reasult is similar to Tang's (Tang et al 2016). And according to previous papers, it had been proved to be a common and effective pathway in PAEs bioremediation; the grampositive bacteria oxidize and dehydrogenate at the C-3-4 position of phthalic acid to form 3, 4dihydroxy phthalic acid, protocatechins and finally enter TCA cycle [42,43].…”

“…Previous studies on the degradation pathways of DEHP have shown that DEHP may be converted to MEHP through esterase hydrolysis, then further hydrolyzed to PA, and finally gradually mineralized [24][25][26]. It has also been reported that the DEHP degradation pathway is that DEHP first shortens the side chains by β-oxidation to form medium-chain DBP, then hydrolyzes into short-chain DEP and finally converts into PA [27]. In short, the degradation pathways of DEHP are not clear yet.…”

Degradability and Biochemical Pathways of the Endocrine-disrupting Plasticizers Phthalate Esters in Plastics by Microorganisms

“…PAEs are widely detected in different ecosystems from anthropogenic sources (Gu, 2017b;2018a;2020a). As phthalates are not bonded chemically to the plastic polymeric resin matrix, they leach out from products easily into the surrounding environment during the use or after disposal of the plastics (Gu, 2018a;Tang et al, 2016). Consequently, phthalates have been detected in a diverse range of environments, from river water to soil and marine sediments (Yang et al, 2018).…”

“…A previous review on remediation of phthalates compiles information on microorganisms and their enzymes that could efficiently transform phthalates (Benjamin et al, 2015), but it failed to address the extent of biodegradation, including mineralization and degradation pathway to offer any further insightful details. Similarly, Tang et al (2016) compared the efficiency of Rhizobium sp. LMB-1 against microorganisms capable of degrading similar substrates.…”

Photocatalytic degradation properties of α-Fe 2 O 3 nanoparticles for dibutyl phthalate in aqueous solution system

“…The conventional methods, including electrochemical method [ 7 ], chemical adsorption method [ 8 ], adsorption method [ 9 ], biodegradation method [ 10 ], only transfer the organic pollutants from one phase to another, which do not degrade [ 11 ]. However, catalytic oxidation can overcome the shortcomings of these traditional methods.…”