Recent advances in laccase activity assays: A crucial challenge for applications on complex substrates

Martin, Elise; Dubessay, Pascal; Record, Eric; Audonnet, Fabrice; Michaud, Philippe

doi:10.1016/j.enzmictec.2023.110373

Cited by 6 publications

(1 citation statement)

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“…Bioremediation is still the most suitable, eco-friendly, low-cost, and effective solution for removing dyes. Microbes like bacteria, algae, fungi, and their metabolic enzymes are used in this process to get rid of contaminants by building up inside cells, changing them, bioadsorbing them, or breaking them down [34,35]. Using enzymes in bioremediation has recently received extraordinary attention in the academic and industrial sectors.…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies on optimized extracellular laccase from Trichoderma harzianum PP389612 and its capabilities for azo dye removal

Abd El-latif,

Zohri,

El-Aref

et al. 2024

Microb Cell Fact

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Background Azo dyes represent a common textile dye preferred for its high stability on fabrics in various harsh conditions. Although these dyes pose high-risk levels for all biological forms, fungal laccase is known as a green catalyst for its ability to oxidize numerous dyes. Methods Trichoderma isolates were identified and tested for laccase production. Laccase production was optimized using Plackett–Burman Design. Laccase molecular weight and the kinetic properties of the enzyme, including Km and Vmax, pH, temperature, and ionic strength, were detected. Azo dye removal efficiency by laccase enzyme was detected for Congo red, methylene blue, and methyl orange. Results Eight out of nine Trichoderma isolates were laccase producers. Laccase production efficiency was optimized by the superior strain T. harzianum PP389612, increasing production from 1.6 to 2.89 U/ml. In SDS-PAGE, purified laccases appear as a single protein band with a molecular weight of 41.00 kDa. Km and Vmax values were 146.12 μmol guaiacol and 3.82 μmol guaiacol/min. Its activity was stable in the pH range of 5–7, with an optimum temperature range of 40 to 50 °C, optimum ionic strength of 50 mM NaCl, and thermostability properties up to 90 °C. The decolorization efficiency of laccase was increased by increasing the time and reached its maximum after 72 h. The highest efficiency was achieved in Congo red decolorization, which reached 99% after 72 h, followed by methylene blue at 72%, while methyl orange decolorization efficiency was 68.5%. Conclusion Trichoderma laccase can be used as an effective natural bio-agent for dye removal because it is stable and removes colors very well.

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Section: Introductionmentioning

confidence: 99%