Comparative Study of PHA Degradation in Natural Reservoirs Having Various Types of Ecosystems

Voinova, O. N.; Gladyshev, Michail I.; Volova, Tatiana G.

doi:10.1002/masy.200850906

Cited by 23 publications

(15 citation statements)

References 12 publications

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“…Although its mechanical properties are almost equivalent to polypropylene (PP) [98], P3HB is stiff and is less ductile, with its elongation to break at 5% compared to PP, which is approximately 400% [91,95]. However, the flexibility and impact strength of this polymer can be improved by increasing valeric acid content during production to form a copolymer of hydroxybutyrate and hydoxyvalerate [91,99]. This enables its use in flexible packaging [91].…”

Section: Polyhydroxyalkanoates (Phas)mentioning

confidence: 99%

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Integrated and Consolidated Review of Plastic Waste Management and Bio-Based Biodegradable Plastics: Challenges and Opportunities

et al. 2020

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Cumulative plastic production worldwide skyrocketed from about 2 million tonnes in 1950 to 8.3 billion tonnes in 2015, with 6.3 billion tonnes (76%) ending up as waste. Of that waste, 79% is either in landfills or the environment. The purpose of the review is to establish the current global status quo in the plastics industry and assess the sustainability of some bio-based biodegradable plastics. This integrative and consolidated review thus builds on previous studies that have focused either on one or a few of the aspects considered in this paper. Three broad items to strongly consider are: Biodegradable plastics and other alternatives are not always environmentally superior to fossil-based plastics; less investment has been made in plastic waste management than in plastics production; and there is no single solution to plastic waste management. Some strategies to push for include: increasing recycling rates, reclaiming plastic waste from the environment, and bans or using alternatives, which can lessen the negative impacts of fossil-based plastics. However, each one has its own challenges, and country-specific scientific evidence is necessary to justify any suggested solutions. In conclusion, governments from all countries and stakeholders should work to strengthen waste management infrastructure in low- and middle-income countries while extended producer responsibility (EPR) and deposit refund schemes (DPRs) are important add-ons to consider in plastic waste management, as they have been found to be effective in Australia, France, Germany, and Ecuador.

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Section: Polyhydroxyalkanoates (Phas)mentioning

confidence: 99%

“…This enables its use in flexible packaging [91]. This copolymer also reportedly degrades faster than the homopolymer hydoxybutyrate [91,99].…”

Section: Polyhydroxyalkanoates (Phas)mentioning

confidence: 99%

Integrated and Consolidated Review of Plastic Waste Management and Bio-Based Biodegradable Plastics: Challenges and Opportunities

et al. 2020

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“…The maximal durations of current biodegradability tests, therefore, are likely to be insufficient for assessing polymer biodegradation within several habitats (e.g. lake bottoms and deep-sea habitats characterized by low temperatures, as well as low availabilities of oxygen, nutrients and light) [ 23 , 61 , 71 , 72 ].…”

Section: Biodegradability In Aquatic Environmentsmentioning

confidence: 99%

“…As sediments represent an important sink for the accumulation of plastic litter, including materials that lose their buoyancy over time [ 18 , 90 , 91 ], there is a particular need to develop further standards for benthic aquatic environments. As rates of biodegradation on the sediment surface may not be representative of those within the sediment [ 72 ], this should also be considered by any new standard(s).…”

Section: Biodegradability In Aquatic Environmentsmentioning

confidence: 99%

Biodegradability standards for carrier bags and plastic films in aquatic environments: a critical review

et al. 2018

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Plastic litter is encountered in aquatic ecosystems across the globe, including polar environments and the deep sea. To mitigate the adverse societal and ecological impacts of this waste, there has been debate on whether ‘biodegradable' materials should be granted exemptions from plastic bag bans and levies. However, great care must be exercised when attempting to define this term, due to the broad and complex range of physical and chemical conditions encountered within natural ecosystems. Here, we review existing international industry standards and regional test methods for evaluating the biodegradability of plastics within aquatic environments (wastewater, unmanaged freshwater and marine habitats). We argue that current standards and test methods are insufficient in their ability to realistically predict the biodegradability of carrier bags in these environments, due to several shortcomings in experimental procedures and a paucity of information in the scientific literature. Moreover, existing biodegradability standards and test methods for aquatic environments do not involve toxicity testing or account for the potentially adverse ecological impacts of carrier bags, plastic additives, polymer degradation products or small (microscopic) plastic particles that can arise via fragmentation. Successfully addressing these knowledge gaps is a key requirement for developing new biodegradability standard(s) for lightweight carrier bags.

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“…PHAs are degraded by two major pathways, one intracellular and other extracellular by PHA-hydrolases and PHA-depolymerases [26,55]. However, the degradation time of a piece of PHA ranges from a few months to years depending on the plastic composition and environmental conditions [56].…”

Section: Degradationmentioning

confidence: 99%

Bacterial Production of Hydroxyalkanoates (PHA)

Prados¹,

Maicas²

2016

ujmr

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The dependence of plastic materials is an increasing problem. Although plastics are very useful for humankind many disadvantages derived from the difficulties linked to recycling and disposal are well known. A feasible alternative is the production and use of bioplastics. These compounds have multiple options at the end of his life that can ensure their safety and efficacy of reuse or recovery. For example, raw materials can be returned to the manufacturer for recycling. Bioplastics synthesized through biotechnology include mainly polyhydroxyalkanoates (PHAs), common lipoidic storage materials accumulated by prokaryotes. Some processes for producing PHAs by fermentation using microorganisms have been developed at a different extent. However, biopolymers (PHA) market is under development, and therefore cannot compete with traditional plastics since manufacturing is still more expensive. In this review we have focused on the study of the production processes of bioplastics where bacteria are present, also describing the scaling to industrial level aspects and future trends.

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Comparative Study of PHA Degradation in Natural Reservoirs Having Various Types of Ecosystems

Cited by 23 publications

References 12 publications

Integrated and Consolidated Review of Plastic Waste Management and Bio-Based Biodegradable Plastics: Challenges and Opportunities

Integrated and Consolidated Review of Plastic Waste Management and Bio-Based Biodegradable Plastics: Challenges and Opportunities

Biodegradability standards for carrier bags and plastic films in aquatic environments: a critical review

Bacterial Production of Hydroxyalkanoates (PHA)

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