Biodegradability of Plastics

Tokiwa, Yutaka; Calabia, Buenaventurada P.; Ugwu, Charles U.; Aiba, Sei‐ichi

doi:10.3390/ijms10093722

Cited by 1,366 publications

(891 citation statements)

References 97 publications

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“…Poly(L-lactide) (PLLA); (C 3 H 4 O 2 )n is one of the aliphatic biodegradable polyesters derived from renewable resources such as corn, cassava, sugar cane, rice and potato through lactic acid fermentation, and it is also fully degradable by both microbial and enzymatic processes (Tokiwa et al, 2009;Gupta et al, 2007;Jarerat et al, 2006;Tokiwa and Calabia, 2006;Tomita et al, 2004). PLLA, as an environmentally friendly (eco-friendly or green ) product, has been developed on a large scale and is currently used for a wide range of applications, including packaging materials (Bhalla et al, 2007;Nolan-Itu Pty Ltd., 2002), medical applications (Jalil, 1990), agricultural products (Gross and Kalra, 2002;Sakai et al, 2001) and textiles.…”

Section: Introductionmentioning

confidence: 99%

Characterization of poly(L-lactide)-degrading enzyme produced by thermophilic filamentous bacteria Laceyella sacchari LP175

Hanphakphoom

Maneewong

Sukkhum

et al. 2014

J. Gen. Appl. Microbiol.

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on an emulsified PLLA agar plate at 50 C. Among the isolates, strain LP175 showed the highest PLLAdegrading ability. It was closely related to Laceyella sacchari, with 99.9% similarity based on the 16S rRNA gene sequence. The PLLA-degrading enzyme produced by the strain was purified to homogeneity by 48.1% yield and specific activity of 328 U·mg-protein-1 with a 15.3-fold purity increase. The purified enzyme was strongly active against specific substrates such as casein and gelatin and weakly active against Suc-(Ala) 3 -pNA. Optimum enzyme activity was exhibited at a temperature of 60 C with thermal stability up to 50 C and a pH of 9.0 with pH stability in a range of 8.5 10.5. Molecular weight of the enzyme was approximately 28.0 kDa, as determined by gel filtration and SDS-PAGE. The inhibitors phenylmethylsulfonyl fluoride (PMSF), ethylenediaminetetraacetate (EDTA), and ethylene glycolbis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA) strongly inhibited enzyme activity, but the activity was not inhibited by 1 mM 1,10-phenanthroline (1,10-phen). The N-terminal amino acid sequences had 100% homology with thermostable serine protease (thermitase) from Thermoactinomyces vulgaris. The results obtained suggest that the PLLA-degrading enzyme produced by L. sacchari strain LP175 is serine protease.Key words: Laceyella sacchari; PLLA-degrading enzyme; Thermoactinomycetaceae; thermophilic filamentous bacteria IntroductionPoly(L-lactide) (PLLA); (C 3 H 4 O 2 )n is one of the aliphatic biodegradable polyesters derived from renewable resources such as corn, cassava, sugar cane, rice and potato through lactic acid fermentation, and it is also fully degradable by both microbial and enzymatic processes (Tokiwa et al., 2009;Gupta et al., 2007;Jarerat et al., 2006;Tokiwa and Calabia, 2006;Tomita et al., 2004). PLLA, as an environmentally friendly (eco-friendly or green ) product, has been developed on a large scale and is currently used for a wide range of applications, including packaging materials (Bhalla et al., 2007;Nolan-Itu Pty Ltd., 2002), medical applications (Jalil, 1990), agricultural products (Gross and Kalra, 2002;Sakai et al., 2001) and textiles.Most PLLA-degrading microorganisms are found in the bacterial order Actinomycetales, e.g. the families Pseudonocardiaceae (Pranamuda and Tokiwa, 1999;Pranamuda et al., 1997), Thermomonosporaceae (Sangwan and Wu, 2008;Sukkhum et al., 2009b), and Streptosporangiaceae (Sukkhum et al., 2009b). Apart from that, thermophilic bacteria in the families Thermoactinomycetaceae (Sukkhum et al., 2009b) and Firmicutes (Oda et al., 2000;Sakai et al., 2001), filamentous fungi in the genera Tritirachium and Paecilomyces (Sangwan and Wu, 2008), and yeast in the genus Cryptococcus have also been reported to be PLLA-degrading microorganisms.Many different types of enzymes are found in PLLAdegrading microorganisms, such as: protease from Amycola- Full PaperCharacterization of poly(L-lactide)-degrading enzyme produced by thermophilic filamentous bacteria Laceyella sacchari LP175 (Received F...

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Section: Introductionmentioning

confidence: 99%

Characterization of poly(L-lactide)-degrading enzyme produced by thermophilic filamentous bacteria Laceyella sacchari LP175

Hanphakphoom

Maneewong

Sukkhum

et al. 2014

J. Gen. Appl. Microbiol.

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“…As substitutes for normal plastic, biodegradable materials have been a hot topic in recent years. Currently, two types are popular on the market: starch-based thermoplastic and aliphatic polyester plastic [31,32]. There is a line of cups and plates for sale in the market that are made of natural wheat straw (see Figure 3).…”

Section: Materials Selectionmentioning

confidence: 99%

Design Strategies for Developing Sustainable Consumer Electronics

You¹,

Wang²,

Ma³

et al. 2016

JRST

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consumer electronics produce a huge amount of waste and harmful residuals every year. This study investigated how to avoid or reduce environmental pollution through the design of consumer electronic products. Through a literature review, analyses, discussions, and case studies, we defined design strategies for developing sustainable consumer electronics. First, material selection should be considered from the perspectives of users, usages, and use environment in accordance with environmental protection requirements. The application of recyclable and remanufacture-able materials is the inexorable trend. Second, electronic products should be designed with simply disassembled structures that employ as many recyclable functional components as possible. Third, the information on the packaging or labels of consumer electronic products should be designed with graphics that are as easy to understand as possible and within an appropriate amount. Moreover, ingenious design solutions that can motivate users positively and actively to alter their environmental protection behaviors are expected.

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“…É importante que se faça uma distinção entre o PC utilizado neste trabalho, um polímero alifático, e o PC que é obtido a partir de bisfenol-A. O primeiro é conhecido e estudado por ser um biomaterial, possuindo uma degradação mais lenta na comparação com os poliésteres, tanto em meios biológicos, quanto na resistência à hidrólise [35], sendo mais utilizado em funções que demandam um material que se degrade bastante lentamente, ou não se degrade [36].…”

Section: Figura 12 -Representação Esquemática Do Poli (áCido Lático)unclassified

“…O PLA, por exemplo, pode ser degradado pela ação de várias bactérias, mas especificamente dos gêneros Amycolalatopsis e Saccharotrix [35].…”

Section: Mecanismos De Degradação E Bioreabsorçãounclassified

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Estudo do comportamento mecânico e biocompatibilidade de blendas PLA/PCL compatibilizadas e não-compatibilizadas

Finotti¹

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Biodegradability of Plastics

Cited by 1,366 publications

References 97 publications

Characterization of poly(L-lactide)-degrading enzyme produced by thermophilic filamentous bacteria Laceyella sacchari LP175

Characterization of poly(L-lactide)-degrading enzyme produced by thermophilic filamentous bacteria Laceyella sacchari LP175

Design Strategies for Developing Sustainable Consumer Electronics

Estudo do comportamento mecânico e biocompatibilidade de blendas PLA/PCL compatibilizadas e não-compatibilizadas

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