Assessment of pro-oxidant activity of natural phenolic compounds in bio-polyesters

Dintcheva, Nadka Tzankova; Baiamonte, Marilena; Spera, Marilena

doi:10.1016/j.polymdegradstab.2018.05.003

Cited by 14 publications

(24 citation statements)

References 21 publications

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“…However, in Figure 16a, it can be observed that the adding of 0.5 wt.% of FA is able to protect the PLA, while the adding of 1 wt.% of FA leads to a larger accumulation of anhydrides, and, surprisingly, the FA exerts a concentration-dependent anti-/pro-oxidant behavior [93]. In Figure 16b, it can be clearly observed that doping PLA with 2 and 3 wt.% of FA leads to a large accumulation of anhydride functionalities, and, additionally, no significant difference is noticeable in the trends for PLA containing FA at 2 and 3 wt.% [26]. Therefore, if the PLA is subjected to UVB exposure, the variation of the anhydride absorption band can be considered a valuable tool to follow the photo-degradation process.…”

Section: Flavene Backbonementioning

confidence: 89%

“…Some natural antioxidants have been considered as suitable stabilizing systems, also for polymers and biopolymers, in order to prevent their oxidative degradation [23]. Unexpectedly, some naturally occurring compounds, based on their chemical compositions, can cause the faster formation of oxygen-containing groups in the polymer and biopolymer-based systems, inducing premature loss of their performance and properties [23][24][25][26]. Additionally, if the natural fillers (e.g.…”

Section: Benefits Of Adding Natural Compounds To Biopolymersmentioning

confidence: 99%

“…Therefore, if the PLA is subjected to UVB exposure, the variation of the anhydride absorption band can be considered a valuable tool to follow the photo-degradation process. In Figure 16, the variations of anhydride band area for PLA sample, added with (a) 0.5 and 1 wt.% [96] and (b) 2 and 3 wt.% of ferulic acid (FA) [26], are plotted.…”

Section: Flavene Backbonementioning

confidence: 99%

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Natural Compounds as Sustainable Additives for Biopolymers

et al. 2020

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In the last few decades, the interest towards natural compounds, coming from a natural source and biodegradable, for biopolymers is always increasing because of a public request for the formulation of safe, eco-friendly, and sustainable materials. The main classes of natural compounds for biopolymers are: (i) naturally occurring fillers (nFil), such as nano-/micro- sized layered alumino-silicate: halloysite, bentonite, montmorillonite, hydroxyapatite, calcium carbonate, etc.; (ii) naturally occurring fibers (nFib), such as wood and vegetable fibers; (iii) naturally occurring antioxidant molecules (nAO), such as phenols, polyphenols, vitamins, and carotenoids. However, in this short review, the advantages and drawbacks, considering naturally occurring compounds as safe, eco-friendly, and sustainable additives for biopolymers, have been focused and discussed briefly, even taking into account the requests and needs of different application fields.

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Section: Flavene Backbonementioning

confidence: 89%

Section: Benefits Of Adding Natural Compounds To Biopolymersmentioning

confidence: 99%

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Natural Compounds as Sustainable Additives for Biopolymers

et al. 2020

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“…However, it has been demonstrated by our research group that some natural phenolic compounds are able to exert concentration anti-/pro-oxidant activity in biopolyesters, such as polylactic acid, PLA [11,12]. In particular, if the natural compounds are added at low concentration to the biopolyester, from around 0.1 wt.% to 0.5 wt.%, they are able to protect the PLA against the oxidative degradation, but if they are added in large amounts, from around 2 wt.% to 3 wt.%, the PLA undergoes faster hydrolytic, photo- and thermo-degradation than the neat matrix [13]. The latter issue opens new windows into the use of some natural compounds as pro-oxidant additives and the control of degradation time of the biopolymers.…”

Section: Introductionmentioning

confidence: 99%

Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions

et al. 2019

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In this work, naturally occurring compounds, such as Vitamin E (VE) and Ferulic Acid (FA), at high concentrations, have been considered as pro-degradant agents for Low Density Polyethylene (PE). However, all obtained results using the naturally occurring molecules as pro-oxidant agents for PE have been compared with the results achieved using a classical pro-oxidant agent, such as calcium stearate (Ca stearate) and with neat PE. The preliminary characterization, through rheological, mechanical and thermal analysis, of the PE-based systems highlights that the used naturally occurring molecules are able to exert a slight plasticizing action on PE and subsequently the PE rigidity and crystallinity slightly decrease, while the ductility increases. To assess the pro-degradant activity of the considered naturally occurring compounds, thin films of neat PE and PE-based systems containing 2 and 3 wt.% Ca stearate, VE and FA have been produced and subjected to accelerated weathering upon UVB light exposure. All obtained results point out that the VE and FA, at these high concentrations, exert a clear pro-oxidant activity in PE and this pro-oxidant activity is very similar to that exerted by Ca stearate. Moreover, the VE and FA at high concentrations can be considered as suitable eco-friendly pro-degradant additives for PE, also in order to control the polyolefin degradation times.

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“…In this study, the authors will use the fractional-order calculus to fit the experimental data obtained for a biodegradable polylactic acid (PLA) containing naturally occurring compounds, such as quercetin (Q) and sodium montmorillonite (NaMMt) nanoparticles, at different ratios, as valuable materials for soil conditioners. e natural polyphenolic compound, i.e., Q, has been added in PLA at different concentrations, e.g., 0.5, 2, and 3 wt.%, considering the currently published experience of the authors in demonstrating the specific concentration dependent anti-/prooxidant activity of these molecules if introduced in PLA [14,15]. Particularly, if these naturally occurring molecules are added at low concentrations, from 0.1 to 0.5 wt.%, they are able to protect the biopolyester against the exposure to UVB irradiation, but if they are added at high concentrations, from 2 to 3 wt.%, they are able to exert a prodegradant effect.…”

Section: Introductionmentioning

confidence: 99%

A Fractional-Order Model of Biopolyester Containing Naturally Occurring Compounds for Soil Stabilization

Dintcheva

Baiamonte

Teresi

et al. 2019

Advances in Materials Science and Engineering

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Currently, the use of polymers and biopolymers as soil-stabilizer additives for control of the soil degradation, deterioration, and desertification and for improving the arid and semiarid soils has been expanded significantly in the agricultural sector. This research was conducted to determine the effect of naturally occurring compounds, such as quercetin (Q) and sodium montmorillonite (NaMMt) at different weight ratios, in biopolyester, such as polylactic acid (PLA), aiming to formulate ecosustainable materials to control the soil degradation and to protect the environment. As known, the use of sophisticated analytical tools to describe the material rheology and melting properties is nowadays very popular among physicists and material scientists. Certainly, several experimental tests conducted on polymeric- and biopolymeric-based materials, such as rubbers, foams, and hydro/aero gels, show that the relaxation time spectra are a continuous function, and as a consequence, multiple relaxation times are involved in the rheological description of the materials, yielding the need for nonconventional relaxation functions. Indeed, in this work, the considered fractional-order model could be considered a powerful tool to describe and to predict the melting properties of the complex polymer-based systems containing different additives.

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Assessment of pro-oxidant activity of natural phenolic compounds in bio-polyesters

Cited by 14 publications

References 21 publications

Natural Compounds as Sustainable Additives for Biopolymers

Natural Compounds as Sustainable Additives for Biopolymers

Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions

A Fractional-Order Model of Biopolyester Containing Naturally Occurring Compounds for Soil Stabilization

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