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Microbial synthesis of eco-friendly polylactate plastic from low-cost agro-industrial wastes as an alternative to petrochemical-based plastic
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This study isolated soil and food waste bacteria capable of producing polylactic acid (PLA) bioplastic from low-cost agricultural byproducts. PLA is a biodegradable alternative to petroleum-based plastics, and producing it from waste feedstocks improves both its economics and environmental profile.
Bioplastics made from renewable resources, such as contemporary biomass, have been developed more quickly as a result of global pollution from plastics made from petroleum, but it is still unclear how these materials will affect ecosystems. A common biopolymer that will make up 33% of the bioplastics produced in 2021 is polylactic acid (PLA). Forty-two bacterial isolates (soil, food wastes, and water wastes) were obtained, and 8 lactic acid bacteria were used for lactic acid (LA) production. These bacteria were classified into three categories, namely high, moderate and low LA producing bacteria which gave LA concentrations ranged from >1.0 g/L (3 bacteria), 0.5 to 1.0 g/L (21 bacteria) and 0.1 to 0.5 g/L (26 bacteria), respectively. The Sudan black staining method revealed that 16 bacteria out of 50 were capable of storing PLA granules, with three lactic acid bacteria referred to as Lactococcus thermophilus, Lactobacillus rhamenose, and Lactobacillus retrieria being the most efficient. The sodium dodecyl sulphate procedure was used to extract PLA from the selected LAB, and the results revealed that L. rhamnose was the most effective strain for producing both lactic acid and PLA. The most important fermentation parameters for lactic acid and polylactate polymer production were evaluated using an optimal custom (factorial) design. The interaction between three factors of selected potato oil waste, C/N ratio (48/1), and inoculum size (10%) resulted in an increase in lactic acid and polylactate polymer productivity by L. rhamenose L6, which reached 0.85 g/L, 0.96 g/L, and cell dry weight 2.33g/L, respectively.
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This review explored bioplastics as eco-friendly alternatives to petroleum-based plastics, examining their production from agricultural and kitchen waste products and their potential for microbial decomposition to help reduce plastic pollution.
Pivotal Role of Microbes in Solid Waste Management
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This review discusses the role of lactic acid bacteria in solid waste management, including their use as probiotics in food systems and their potential to produce polylactic acid (PLA), a biodegradable plastic. Using microbes to produce bioplastics that break down naturally could help reduce persistent microplastic pollution.
Hydrolyzable microplastics in soil—low biodegradation but formation of a specific microbial habitat?
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Hydrolyzable microplastics such as polylactic acid showed low biodegradation in soil despite their marketed degradability, while their surfaces hosted distinct microbial communities forming a specialized plastisphere. The study questions the environmental safety of biodegradable plastics in agricultural soil contexts.
Waste Valorization for Sustainable Value-Added Products
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Scientists are turning food scraps into biodegradable plastic by fermenting them into lactic acid, then converting that into a plant-based material called PLA — offering an eco-friendly alternative to petroleum-based plastics. This matters because conventional plastics break down into microplastics that contaminate our food and water and have been linked to health concerns, so finding cheaper, waste-based ways to make truly biodegradable plastics could help reduce that exposure while also cutting down on landfill waste.
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