Liver plays a crucial role in detoxification processes and metabolism of xenobiotics, and therefore, it is a target organ of toxicity of different classes of chemicals. In this context, some key enzymes present in liver are considered to be good biochemical markers of hepatic damage and can have their activities determined via spectrophotometry. Aspartate and alanine aminotransferases, alkaline phosphatase, lactate dehydrogenase, and glutathione peroxidase are enzymes that have activities often changed in response to hepatotoxic compounds and can be accessed through the larval period of zebrafish (Danio rerio). In this chapter, we described methodologies for analyses of these five biomarkers in pooled zebrafish larvae through spectrophotometry.
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