Enzymatic degradation of PLA/cellulose nanocrystal composites

Hegyesi, Nóra; Zhang, Yunchong; Kohári, Andrea; Polyák, Péter; Sui, Xiaofeng; Pukánszky, Béla

doi:10.1016/j.indcrop.2019.111799

Cited by 75 publications

(61 citation statements)

References 36 publications

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“…The decomposition temperature of the films increased as the NCC loading increased, which showed that NCC improved the thermal stability and slowed down the thermal degradation rate. Hegyesi et al (2019) tested the degradation rate of PLA/NCC bionanocomposites by using enzymatic agents, namely lipase from Candida rugosa (CRL) and protease (proteinase K from Tritirachium album). Proteinase K catalyzed the degradation rate of PLA/NCC sample while CRL did not.…”

Section: Nanocellulose Reinforced Pla Biocompositesmentioning

confidence: 99%

Nanocellulose Reinforced Thermoplastic Starch (TPS), Polylactic Acid (PLA), and Polybutylene Succinate (PBS) for Food Packaging Applications

et al. 2020

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Synthetic plastics are severely detrimental to the environment because nonbiodegradable plastics do not degrade for hundreds of years. Nowadays, these plastics are very commonly used for food packaging. To overcome this problem, food packaging materials should be substituted with "green" or environmentally friendly materials, normally in the form of natural fiber reinforced biopolymer composites. Thermoplastic starch (TPS), polylactic acid (PLA) and polybutylene succinate (PBS) were chosen for the substitution, because of their availability, biodegradability, and good food contact properties. Plasticizer (glycerol) was used to modify the starch, such as TPS under a heating condition, which improved its processability. TPS films are sensitive to moisture and their mechanical properties are generally not suitable for food packaging if used alone, while PLA and PBS have a low oxygen barrier but good mechanical properties and processability. In general, TPS, PLA, and PBS need to be modified for food packaging requirements. Natural fibers are often incorporated as reinforcements into TPS, PLA, and PBS to overcome their weaknesses. Natural fibers are normally used in the form of fibers, fillers, celluloses, and nanocelluloses, but the focus of this paper is on nanocellulose. Nanocellulose reinforced polymer composites demonstrate an improvement in mechanical, barrier, and thermal properties. The addition of compatibilizer as a coupling agent promotes a fine dispersion of nanocelluloses in polymer. Additionally, nanocellulose and TPS are also mixed with PLA and PBS because they are costly, despite having commendable properties. Starch and natural fibers are utilized as fillers because they are abundant, cheap and biodegradable.

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Section: Nanocellulose Reinforced Pla Biocompositesmentioning

confidence: 99%

Nanocellulose Reinforced Thermoplastic Starch (TPS), Polylactic Acid (PLA), and Polybutylene Succinate (PBS) for Food Packaging Applications

et al. 2020

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“…Several examples can be found in the literature about the use of this type of enzymes to accelerate the degradation study of PLA samples from several months to a few days or even hours [33][34][35][36]. Under enzymatic degradation and according to the literature, PLA structures are able to retain their properties almost unchanged for up to 8 months [37].…”

Section: Degradation Analysismentioning

confidence: 99%

“…In addition, non-treated PLA samples immersed in Tris-HCl solution without enzymes were used as control samples. The buffer-enzyme solution was replaced daily to maintain a high enzymatic activity, as the reduction of the pH value due to the release of lactic acid would cause the denaturation of the enzyme [37]. The weight loss of the structures after 5 days of degradation at 37 • C was assessed by using an analytical balance (±0.1 mg, A&D Scales Gemini Series, GR-200, Germany), to measure the weight of the scaffolds before and after the test.…”

Section: Degradation Analysismentioning

confidence: 99%

Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

et al. 2020

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3D-printed polylactic acid (PLA) scaffolds have been demonstrated as being a promising tool for the development of tissue-engineered replacements of bone. However, this material lacks a suitable surface chemistry to efficiently interact with extracellular proteins and, consequently, to integrate into the surrounding tissue when implanted in vivo. In this study, aloe vera coatings have been proposed as a strategy to improve the bioaffinity of this type of structures. Aloe vera coatings were applied at three different values of pH (3, 4 and 5), after treating the surface of the PLA scaffolds with oxygen plasma. The surface modification of the material has been assessed through X-ray photoelectron spectroscopy (XPS) analysis and water contact angle measurements. In addition, the evaluation of the enzymatic degradation of the structures showed that the pH of the aloe vera extracts used as coating influences the degradation rate of the PLA-based scaffolds. Finally, the cell metabolic activity of an in vitro culture of human fetal osteoblastic cells on the samples revealed an improvement of this parameter on aloe vera coated samples, especially for those treated at pH 3. Hence, these structures showed potential for being applied for bone tissue regeneration.

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“…The enzymatic degradation rates of polyesters should also greatly depend on their chemical structure, molecular weight, morphology, crystallinity, and so on [ 41 ]. Hydrolytic catalyst proteinase K is known for its high activity for PLA degradation [ 42 ], and the PLA homopolymers (PLA-1 and -2) were actually degraded up to 25% in 24 h [ 29 ]. Lipase PS shows high efficiency towards the hydrolysis of poly(alkanediyl dicarboxylate) [ 43 , 44 ].…”

Section: Discussionmentioning

confidence: 99%

Synthesis, Properties, and Biodegradability of Thermoplastic Elastomers Made from 2-Methyl-1,3-propanediol, Glutaric Acid and Lactide

Zahir

Kida

Tanaka

et al. 2021

Life

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An innovative type of biodegradable thermoplastic elastomers with improved mechanical properties from very common and potentially renewable sources, poly(L-lactide)-b-poly(2-methyl-1,3-propylene glutarate)-b-poly(L-lactide) (PLA-b-PMPG-b-PLA)s, has been developed for the first time. PLA-b-PMPG-b-PLAs were synthesized by polycondensation of 2-methyl-1,3-propanediol and glutaric acid and successive ring-opening polymerization of L-lactide, where PMPG is an amorphous central block with low glass transition temperature and PLA is hard semicrystalline terminal blocks. The copolymers showed glass transition temperature at lower than −40 °C and melting temperature at 130–152 °C. The tensile tests of these copolymers were also performed to evaluate their mechanical properties. The degradation of the copolymers and PMPG by enzymes proteinase K and lipase PS were investigated. Microbial biodegradation in seawater was also performed at 27 °C. The triblock copolymers and PMPG homopolymer were found to show 9–15% biodegradation within 28 days, representing their relatively high biodegradability in seawater. The macromolecular structure of the triblock copolymers of PLA and PMPG can be controlled to tune their mechanical and biodegradation properties, demonstrating their potential use in various applications.

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Enzymatic degradation of PLA/cellulose nanocrystal composites

Cited by 75 publications

References 36 publications

Nanocellulose Reinforced Thermoplastic Starch (TPS), Polylactic Acid (PLA), and Polybutylene Succinate (PBS) for Food Packaging Applications

Nanocellulose Reinforced Thermoplastic Starch (TPS), Polylactic Acid (PLA), and Polybutylene Succinate (PBS) for Food Packaging Applications

Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

Synthesis, Properties, and Biodegradability of Thermoplastic Elastomers Made from 2-Methyl-1,3-propanediol, Glutaric Acid and Lactide

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