Lin, et al (2024) Rice Straw-Derived BiocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More Mitigates Microcystin-LR-Induced Hepatic Histopathological Injury and Oxidative Damage in Male Zebrafish via the Nrf2 Signaling Pathway. Toxins. https://doi.org/10.3390/toxins16120549

Rice straw-derived biochar shows promise as an environmentally friendly way to mitigate the harmful effects of microcystin-LR (MC-LR), a toxin produced during cyanobacterial blooms. A recent study exposed male zebrafish to varying concentrations of MC-LR and biochar over 30 days to evaluate the combined impact on liver health.

MC-LR, known to accumulate in fish liver, can cause severe oxidative stress and tissue damage, as shown in zebrafish exposed to the toxin. Symptoms included liver vacuolization, pyknotic nuclei, and swollen mitochondria, all indicators of significant cellular damage. However, co-exposure to biochar reduced these effects by decreasing MC-LR bioavailability in liver tissues.

Biochar also improved the antioxidant defense system in zebrafish. The study observed reduced malondialdehyde (MDA) levels, a marker of oxidative stress, and restored activities of key antioxidant enzymes, such as superoxide dismutase (SOD) and catalase (CAT). Gene expression analysis confirmed that biochar moderated oxidative damage by activating the Nrf2 signaling pathway, a critical defense mechanism in stress response.

This research highlights the dual role of rice straw biochar: it adsorbs toxins like MC-LR and helps protect aquatic organisms from their harmful effects. With further exploration, biochar could serve as an affordable and eco-friendly material for managing water pollution during harmful algal blooms, benefiting both ecosystems and public health.