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Biodegradation of polyethylene: a brief review
Ghatge Sunil,Yang Youri,Ahn Jae-Hyung,Hur Hor-Gil 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.3
Plastic waste management and recycling became a serious global issue as it affects living beings from all the ecosystems. Researchers investigated biodegradation of polyethylene (PE) by measuring changes in various physicochemical and structural characteristics using techniques like as fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), etc. However, these evidences are not enough to prove the exact biodegradation of PE. In this review, we summarized microbial biodegradation of polyethylene and discussed recent developments for the candidate microbial enzymes and their possible roles in PE degradation. In addition, we conversed the advanced technologies correctly used for measuring PE degradation using isotope-labeled PE to figure out its metabolism into the end products like as 13CO2.
Yang, Youri,Song, Woo-Young,Hur, Hor-Gil,Kim, Tae-Young,Ghatge, Sunil Elsevier 2019 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.124 No.-
<P><B>Abstract</B></P> <P>Enzymatic conversion of lignin into high-value chemicals is a key step in sustainable and eco-friendly development of lignin valorization strategies. In the present study, a novel thermoalkaliphilic laccase, CtLac, from <I>Caldalkalibacillus thermarum</I> strain TA2.A1 was tested for the depolymerization of lignin and the production of value-added chemicals, using three different lignocellulosic biomass, organosolv lignin (OSL), and Kraft lignin. Seven valuable lignin monomers were identified from the CtLac-treated samples using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Remarkably, increases of 22.0%, 65.6%, and 27.3% of <I>p</I>-hydroxybenzaldehyde and increases of 111.1%, 93.5%, and 238.1% of vanillin were observed from rice straw, corn stover, and reed, respectively. Comparative analysis of lignin monomers released from rice straw, using <I>Trametes versicolor</I> laccase (TvL) and CtLac indicated efficient depolymerization of lignin by CtLac. CtLac treatment resulted in 2.3 fold and 5.6 fold, and 1.9 fold and 2.8 fold higher amounts of <I>p</I>-hydroxybenzaldehyde and vanillin from OSL and Kraft lignin, respectively, compared to CtLac-treated rice straw samples after 12 h reaction. OSL was the best substrate for the production of benzaldehyde chemicals using CtLac treatment. The results demonstrated potential application of bacterial laccase CtLac for valorization of biomass lignin into high-value benzaldehyde chemicals under thermoalkaliphilic conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel thermoalkaliphilic laccase CtLac, was investigated for lignin depolymerization. </LI> <LI> Lignin monomers released after CtLac treatment were analyzed using HPLC-MS/MS analysis. </LI> <LI> High-value benzaldehyde chemicals <I>p</I>-hydroxylbenzaldehyde and vanillin were released from lignin after CtLac treatment. </LI> <LI> CtLac treated Organosolv lignin released highest amount of benzaldehyde chemicals. </LI> <LI> CtLac favored depolymerization of lignin under thermoalkaliphilic conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>