FTIR, XRD, and DSC analysis of the rosemary extract effect on polyethylene structure and biodegradability

Musuc, Adina Magdalena; Doni, Mihaela; Jecu, Luiza; Rusu, Adriana; Popa, Vlad Tudor

doi:10.1007/s10973-012-2909-y

Cited by 43 publications

(24 citation statements)

References 36 publications

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“…The biodegraded matrices, PLA/R/14d/CG and PLA/R/14d/PC presented a melting peak split in two distinct melting peaks which may be ascribed to recrystallization of the fragments resulted under fungi action. A similar behavior was found also by Musuc et al in the case of addition of rosemary to polyethylene films and irradiated [62].…”

Section: Samples Codesupporting

confidence: 88%

Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Stoleru

Vasile²,

Oprică

et al. 2020

Polymers

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The fungal degradation of the complex polymeric systems based on poly(lactic acid) (PLA) and natural bioactive compounds (chitosan and powdered rosemary alcoholic extract) was studied. Two fungal strains, Chaetomium globosum and Phanerochaete chrysosporium were tested. Both fungi characteristics and changes in morphology, structure and thermal properties were monitored. Biochemical parameters as superoxide dismutase, catalase, soluble protein and malondialdehyde have been determined at different time periods of fungal degradation. The fungi extracellular enzyme activities are slightly decreased in the case of composites containing bioactive compounds. The presence of natural compounds in the PLA-based polymeric system determines an acceleration of fungal degradation and probably the chemical hydrolysis, which further helps the attachment of fungi on the surface of polymeric samples. Significant decreases in average molecular mass of the polymeric samples were observed by fungi action; accompanied by structural changes, increase in crystallinity and decrease of thermal properties and the loss of the physical integrity and finally to degradation and integration of fungal degradation products into environmental medium. It was found that both fungi tested are efficient for PLA-based materials degradation, the most active from them being Chaetomium globosum fungus.

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Section: Samples Codesupporting

confidence: 88%

Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Stoleru

Vasile²,

Oprică

et al. 2020

Polymers

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“…The diffraction peaks at 16.2° and 22.5° were related to the (101) plane and the (002) plane of cellulose [ 1 , 27 ]. The XRD peaks at 21.5° and 23.8° corresponded to the (100) and (200) planes of PE [ 28 ]. These peaks indicated that PE was attached to cellulose.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Nano-ZnO/Polyethylene/Wood-Fiber Composite with Enhanced Microwave Absorption and Photocatalytic Activity via a Facile Hot-Press Method

et al. 2017

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A polyethylene/wood-fiber composite loaded with nano-ZnO was prepared by a facile hot-press method and was used for the photocatalytic degradation of organic compounds as well as for microwave absorption. ZnO nanoparticles with an average size of 29 nm and polyethylene (PE) powders were dispersed on the wood fibers’ surface through a viscous cationic polyacrylamide (CPAM) solution. The reflection loss (RL) value of the resulting composite was −21 dB, with a thickness of 3.5 mm in the frequency of 17.17 GHz. The PE/ZnO/wood-fiber (PZW) composite exhibited superior photocatalytic activity (84% methyl orange degradation within 300 min) under UV light irradiation. ZnO nanoparticels (NPs) increased the storage modulus of the PZW composite, and the damping factor was transferred to the higher temperature region. The PZW composite exhibited the maximum flexural strength of 58 MPa and a modulus of elasticity (MOE) of 9625 MPa. Meanwhile, it also displayed dimensional stability (thickness swelling value of 9%).

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“…Differential scanning calorimetry is useful to measure the thermal properties and the effects of degradation on the structure of biodegradable polymers, and is a useful method in studies on the nature of biological systems such as proteins or lipids [26][27][28][29][30]. Using DSC, we monitored thermal parameters which included the temperatures of the pretransition (T p ) and the main transition peak (T m ), the half-width (DT 1/2 ), and change of the enthalpy (DH) of the main transition of lipids.…”

Section: Introductionmentioning

confidence: 99%

Effect of chlorogenic acid on the phase transition in phospholipid and phospholipid/cholesterol membranes

Pruchnik

Bonarska-Kujawa

Kleszczyńska

2014

J Therm Anal Calorim

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Chlorogenic acid (CGA) is present in many plants, especially in green coffee, dry plums, and bilberries. It is an important bioactive polyphenol. Studies showed that CGA has an antioxidative, bacteriostatic, anticancer, antiviral, and anti-inflammatory activity. Despite great interest in this compound, its interaction with the lipid model membrane has not yet been investigated. To better understand the relationship between the biological activity of CGA and its interaction with biological membranes, the thermotropic behavior of model lipid membranes was investigated. The effect of CGA on the model lipid membrane, specifically on the lipid bilayer phase transitions, was examined by the combined methods: differential scanning calorimetry and fluorescence spectroscopy. In particular, the degree of packing order of the hydrophilic phase of the lipid bilayer was determined using the fluorimetric method with Laurdan and Prodan probes, while the fluorescence anisotropy of the hydrophobic phase with the DPH and TMA-DPH probes. The results of the study show that CGA incorporates mainly into the hydrophilic part of membrane, changing the packing order of the polar heads of lipids. No significant changes were recorded in membrane fluidity of the hydrophobic membrane region, for the fluorescence anisotropy practically did not change. One can thus infer that CGA does not penetrate deep into the hydrophobic area of the membrane.

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FTIR, XRD, and DSC analysis of the rosemary extract effect on polyethylene structure and biodegradability

Cited by 43 publications

References 36 publications

Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Fabrication of a Nano-ZnO/Polyethylene/Wood-Fiber Composite with Enhanced Microwave Absorption and Photocatalytic Activity via a Facile Hot-Press Method

Effect of chlorogenic acid on the phase transition in phospholipid and phospholipid/cholesterol membranes

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