Biodegradable PBAT/PLA Blend with Bioactive MCPA-PHBV Conjugate Suppresses Weed Growth

Kwiecień, Iwona; Adamus, Grażyna; Jiang, Guozhan; Baldwin, Timothy C.; Khan, H. R.; Johnston, Brian; Pennetta, Valentina; Hill, David J.; Bretz, Inna; Kowalczuk, Marek

doi:10.1021/acs.biomac.7b01636

Cited by 47 publications

(24 citation statements)

References 18 publications

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“…The films showed better mechanical properties with the addition of CaCO 3 , and highly orientated amorphous structures were obtained, leading to low water absorption and low degradability in the simulated soil. The herbicide 2‐methyl‐4‐chlorophenoxyacetic acid (MCPA) conjugated with poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) was prepared by Kwiecien et al via a melt transesterification route. The resultant bioactive oligomer was then mixed with PLA and PBAT to be used as a bioactive, biodegradable mulch to deliver the herbicide to target broadleaf weed species.…”

Section: Introductionmentioning

confidence: 99%

Polylactide/poly(butylene adipate‐co‐terephthalate)/rare earth complexes as biodegradable light conversion agricultural films

Wang

et al. 2018

Polymers for Advanced Techs

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Rare earth europium(III) complex with α‐thenoyltrifluoroacetone and triphenylphosphine oxide (Eu (TTA)3(TPPO)2, shortened as EuTT) was synthesized in this paper, then blended with polylactide (PLA) and poly(butylene adipate‐co‐terephthalate) (PBAT) to prepare the biodegradable agricultural films. Through the optical performance, mechanical properties, and other research, the results showed that the rare earth complex could convert the sun's ultraviolet light to red light when doped polymer. Moreover, the relative intensity ratio of 5D0/7F2 to 5D0/7F1 of PLA/PBAT/EuTT film could reach 3.79, which implied that the film had strong fluorescence intensity and high color purity. The highest tensile strength of the film could reach 36.7/25.2 MPa, and the elongation at break was 462.8/483.0% in the machine and in the transverse direction when the added amount of Eu (TTA)3(TPPO)2 was 0.1 wt%. The tensile strength of the film was 33.3/20.1 MPa, and the elongation at break could reach 535.8/413.6% when the added amount of Eu (TTA)3(TPPO)2 was increased up to 0.3 wt%. Gel permeation chromatography showed that the Eu (TTA)3(TPPO)2 could cause depolymerization of polylactide, resulting in a decrease in the molecular weight of PLA. Furthermore, the crystallization ability of PLA was also improved. In this paper, the biodegradable films exhibited excellent ultraviolet light conversion ability and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Polylactide/poly(butylene adipate‐co‐terephthalate)/rare earth complexes as biodegradable light conversion agricultural films

Wang

et al. 2018

Polymers for Advanced Techs

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“…It can be seen from the EDS data depicted in Figure 2 that the quantity of the signature element Cl correlates well with the concentration of MCPA used to coat the bioactive mulch film and that it is absent in the negative control, as previously reported. 26 Furthermore, the results from the EDS analysis performed after the greenhouse experiments indicate that the quantity of signature element Cl has decreased substantially in all the mulch film samples coated with MCPA. Overall, the trend in the results correlates with the initial concentration of MCPA present on the bioactive films ( Figure 3 ).…”

Section: Resultsmentioning

confidence: 95%

“…In this regard, the results of our preliminary study on the application of biodegradable mulch for the control of broad leaf weed species indicated that MCPA-PHBV conjugate suppressed weed growth. 26 However, the main limitation of this pilot study was the relatively large range of MCPA levels tested, against limited broadleaf weed species, which germinated as a result of natural soil infestation. The current study is a follow-up to our previous investigation and has been meticulously designed to examine a narrower range of herbicide MCPA levels embedded within the biodegradable bioactive films, against a wider variety of broadleaf species, using artificial weed infestation of soil media.…”

Section: Introductionmentioning

confidence: 98%

Effective Control against Broadleaf Weed Species Provided by Biodegradable PBAT/PLA Mulch Film Embedded with the Herbicide 2-Methyl-4-Chlorophenoxyacetic Acid (MCPA)

Khan

Kaur

Baldwin

et al. 2020

ACS Sustainable Chem. Eng.

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Biodegradable mulches are considered a promising alternative to polyethylene-based, nonbiodegradable mulch for sustainable agriculture. In the present study, a bioactive 2-methyl-4- cholorophenoxyacetic acid/poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (MCPA-PHBV) conjugate blended with biodegradable poly(butylene adipate- co -terephthalate/polylactide (PBAT/PLA) was developed and used as mulch under controlled condition greenhouse pot experiment with fava bean ( Vicia faba ) as the nontarget crop species. The objectives were to examine the effectiveness of sustained-release of MCPA herbicide from biodegradable mulch for broadleaf weed suppression and to assess any adverse effects of the herbicide on the nontarget species (fava bean). The energy-dispersive X-ray spectroscopy analysis (EDS) suggests that a substantial quantity of the herbicide was released from the biodegradable mulch which effectively killed the broadleaf weed species even at 1% MCPA concentration. However, the higher concentrations of the herbicide adversely affected several physiological parameters of fava bean growth and development. Stomatal conductance decreased, while leaf temperature subsequently rose (at MCPA concentrations 5, 7.5, and 10%). The quantum yield of the Photosystem II (PSII) indicates that the photosynthetic efficiency was also restricted at concentrations 7.5% and 10%. Evidently, this slow-release herbicide system worked efficiently for broadleaf weed control but at higher concentrations, resulted in adverse physiological effects on the nontarget crop species. This study has demonstrated that biodegradable mulches containing MCPA herbicide are able to effectively inhibit the growth of broad leaf weed species and may be of potential importance in a wide variety of horticultural and agricultural applications.

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“…Currently, biodegradable mulching films attract growing interest in weed management as an alternative to conventional polyethylene‐based ones . Kwiecien et al .…”

Section: Introductionmentioning

confidence: 99%

“…Currently, biodegradable mulching films attract growing interest in weed management as an alternative to conventional polyethylene‐based ones . Kwiecien et al . demonstrated that a conjugate of herbicide 2‐methyl‐4‐chlorophenoxyacetic acid and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) immobilized in a biodegradable poly(butylene adipate‐co‐terephthalate) (PBTA)/polylactide (PLA) blend may be gradually released at a sufficient level to supress the growth of broadleaf weed species.…”

Section: Introductionmentioning

confidence: 99%

Environmental usefulness of PLA/PEG blends for controlled‐release systems of soil‐applied herbicides

Rychter

Lewicka

Rogacz

2019

J of Applied Polymer Sci

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Blends consisting of biodegradable polylactide (PLA) and poly(ethylene glycol) (PEG) were investigated for their usefulness as an environmentally friendly herbicide formulation with prolonged activity. The aim of this study was to evaluate the release rate of selected soil‐applied herbicides from the PLA/PEG blend containing PEG of various molecular weights and to assess the phytotoxicity of the PEGs according to OECD 208 guidelines. The release rate of immobilized herbicides was correlated with degradation of the blends used. The progress of PLA/PEG blend degradation in water, soil, and activated sludge was estimated by sample weight loss, changes in blend composition, and microscopic observations of the blend surfaces during the experiment. The proposed formulation of the immobilized herbicide in a blend consisting of slowly biodegradable PLA and water‐soluble PEG provides the possibility to release the herbicides for a relatively long time, for approximately six months, which is a demand of weed management. The effect of PEGs on plant growth and development was dependent on both their concentration and molecular weight. With a higher concentration in soil and a higher molecular weight of PEG, a more harmful effect on plants was noticed. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47856.

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Biodegradable PBAT/PLA Blend with Bioactive MCPA-PHBV Conjugate Suppresses Weed Growth

Cited by 47 publications

References 18 publications

Polylactide/poly(butylene adipate‐co‐terephthalate)/rare earth complexes as biodegradable light conversion agricultural films

Polylactide/poly(butylene adipate‐co‐terephthalate)/rare earth complexes as biodegradable light conversion agricultural films

Effective Control against Broadleaf Weed Species Provided by Biodegradable PBAT/PLA Mulch Film Embedded with the Herbicide 2-Methyl-4-Chlorophenoxyacetic Acid (MCPA)

Environmental usefulness of PLA/PEG blends for controlled‐release systems of soil‐applied herbicides

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