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Do Biodegradable Microplastics Threaten Chlorella spp.? First Study in Indonesia Using Leachate Exposure
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This study investigated whether chemical leachates from biodegradable microplastics are toxic to Chlorella algae in Indonesian waters. The findings showed that even so-called biodegradable plastics release substances that can impair the growth of these foundational aquatic organisms. This raises questions about whether biodegradable plastics are truly safe alternatives, since their breakdown products can still harm the aquatic ecosystems that support fisheries and food production.
Biodegradable plastics are increasingly being promoted as environmentally friendly alternatives to conventional plastics. However, under aquatic conditions, their degradation may remain incomplete, leading to the formation of microplastics and leachates containing potentially toxic compounds. These leachates can threaten aquatic organisms, particularly microalgae, which act as primary producers and form the base of marine food web. Despite these concerns, limited research has examined the sublethal toxicity of biodegradable microplastic leachates on microalgae. This study aimed to evaluate the toxic effects of leachates derived from biodegradable polypropylene (PP) and high-density polyethylene (HDPE) plastics on the growth of the green microalgae Chlorella spp. A 96-hour static toxicity test was conducted under laboratory conditions using a completely randomized design with five concentration levels (0, 0.1, 1.0, 10, and 100 mg/L). The algae were cultured in EDTA-free Walne medium with an initial cell density of 104 cells/mL. Cell density was measured at the end of exposure to determine growth inhibition and calculate the 50% inhibitory concentration (IC50). The results showed a clear concentration-dependent response, with PP leachate exhibiting significantly higher toxicity (IC50 = 0.48 mg/L) compared to HDPE leachate (IC50 = 682.49 mg/L). These findings suggest that the chemical composition and leachability of additives differ among plastic types, influencing their environmental impact. This study highlights the potential ecological risks of biodegradable plastics and emphasizes the need for stricter regulation of additives and comprehensive ecotoxicological assessments.
More Papers Like This
Do Biodegradable Microplastics Threaten Chlorella spp.? First Study in Indonesia Using Leachate Exposure
AI summary Read the abstract
This study tested whether leachates from biodegradable microplastics harm Chlorella algae, which form the base of aquatic food chains. The results showed that even plastics marketed as eco-friendly can release chemicals that impair algae growth at sublethal levels. This is concerning because damage to these microscopic organisms can ripple through the entire food web, potentially affecting the fish and shellfish people eat.
Biodegradable and conventional microplastics posed similar toxicity to marine algae Chlorella vulgaris
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Researchers compared the toxicity of biodegradable microplastics made from polylactic acid and polybutylene succinate with conventional microplastics made from polyethylene and polyamide on marine algae. They found that both types inhibited algal growth and photosynthesis to a similar degree, causing comparable oxidative stress and cell membrane damage. The study challenges the assumption that biodegradable plastics are inherently safer for marine ecosystems than conventional plastics.
Molecular-level insights into the leachates released from ultraviolet-aged biodegradable and conventional commercial microplastics and their mechanism of toxicity toward Chlorella pyrenoidosa
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Researchers compared leachates from UV-aged biodegradable and conventional microplastics and found that biodegradable plastics actually released several times more dissolved organic matter and nano-sized particles than traditional plastics. The leachates from biodegradable plastics also caused more gene changes and greater toxicity in algae. This challenges the assumption that biodegradable plastics are environmentally safer, suggesting they may release more harmful substances as they break down.
Microplastics leachate may play a more important role than microplastics in inhibiting microalga Chlorella vulgaris growth at cellular and molecular levels
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Researchers found that chemical compounds leaching from aged microplastics may be more harmful to algae than the microplastic particles themselves. UV-weathered polyethylene and PVC released substances that inhibited algae growth, caused oxidative stress, and altered gene expression more severely than direct particle exposure. The study suggests that the chemicals released by degrading microplastics deserve more attention as a source of aquatic toxicity.
Comparative toxicity of conventional and biodegradable microplastics to the marine algae Chlorella vulgaris: a critical review
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This review of existing research found that "biodegradable" plastic particles in the ocean are just as harmful to marine algae as regular plastic particles. Both types of tiny plastic pieces damage the algae that form the base of ocean food chains, and biodegradable plastics may actually break apart faster, creating more pollution. This matters because when ocean algae are harmed, it can affect the entire marine food web that humans depend on for seafood.
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