What is Laccase?
Laccases are multicopper-containing oxidoreductase enzymes (EC 1.10.3.2) found in fungi, plants, and bacteria that catalyze the oxidation of phenolic and non-phenolic substrates by reducing molecular oxygen to water. Known for their eco-friendly properties, they are widely used in bioremediation, wastewater treatment, and in industrial processes like pulp bleaching, textile manufacturing, and food production.
Everything You Need to Know
What is the function of the laccase?
Fungal laccases are involved in sporulation, pigment production, fruiting body formation, stress defense, plant pathogenesis, and lignin degradation. Although most purified laccases are extracellular enzymes, wood-rotting fungi also contain intracellular laccases.
Which bacteria produce laccase?
Laccase, a copper-containing oxidase enzyme, has garnered significant attention for its potential in environmental biotechnology, particularly in the degradation of complex organic pollutants such as textile dyes. The enzyme is produced by various microorganisms, including the bacteria B. subtilis and the fungus A.
Can laccase degrade plastic?
Several fungi have been identified that produce enzymes capable of plastic degradation in various laboratory conditions. This paper presents a study that determined the ability of fungi to degrade low molecular weight polyvinyl chloride (PVC) by the enzyme laccase.
What are the sources of laccase enzyme?
Laccases are widely distributed in higher plants, bacteria, fungi, and insects. In plants, laccases are found in cabbages, turnip, potatoes, pears, apples, and other vegetables. They have been isolated from Ascomyceteous, Deuteromycteous and Basidiomycetous fungi to which more than 60 fungal strains belong.
Main Details:
Laccases in the cutting edge of biotechnology
The last decades have witnessed a heightened interest in the use of laccases as biocatalysts to replace conventional chemical processes in the textile, pulp and paper and pharmaceutical industries.
Food --- The food industry makes use of laccases due to their ability to foster homo‐ and heteropolymerization reactions.
Cosmetics --- The oxidative potential of laccases has also been harnessed in the cosmetic sector for the manufacturing of personal‐care products.
Textiles --- Laccases have attracted increasing interest in the textile industry to be used in processes ranging from the bleaching of denim fabrics.
Organic synthesis --- Laccases are useful biocatalysts for the pharma sector since they can catalyse a wide range of synthetic reactions, ranging from the transformation of antibiotics to the derivatization of amino acids for the synthesis of metabolically stable amino acid analogues.
Pulp and paper --- During industrial paper production, lignin in the wood pulp must be separated and degraded.
Biofuels --- Lignocellulosic materials are among the most promising feedstocks for bioethanol production.
Paints --- Alkyd resins are polyesters synthesized by the polymerization of polyalcohols, dicarboxylic acids or anhydrides and unsaturated fatty acids.
Furniture --- Medium‐density fibreboards (MDF) are dry formed panel products manufactured by cross‐linking of lignocellulosic materials with a synthetic resin under heat pressure in the presence of moisture.
Nanobiotechnology and biomedicine --- Due to their ability to catalyse direct electron transfer, laccases have been studied for years in relation to the development of biofuel cells and biosensors.
Enzymatic bioremediation --- Environmentally hazardous xenobiotic compounds like polycyclic aromatic hydrocarbons (PAHs), phenols and organophosphorus insecticides are known to have teratogenic and carcinogenic effects.
Mechanism: Laccases perform a one-electron oxidation on aromatic compounds and amines, producing radical intermediates that often lead to polymerisation or ring cleavage.
Environmental Benefits: Because laccase uses molecular oxygen as a co-substrate and produces water as the only by-product, it is considered a "green" enzyme.
Industrial Applications:
Bioremediation: Degradation of dyes, phenols, and pharmaceutical waste from industrial effluents.
Pulp & Paper: Bio-pulping and bio-bleaching to eliminate lignin.
Food/Beverages: Used in winemaking, baking, and for removing phenolic compounds in beer/juice.
Textiles: Degradation of indigo dye in denim washing.
Sources: Primarily produced by white-rot fungi, but also found in bacteria and higher plants.
Limitations: High costs of production, potential non-reusability, and instability in harsh environmental conditions (pH/temperature) often necessitate enzyme immobilization to enhance performance.
ANALYTICAL RESULTS
| Test Item | Method / Ref. | Specification | Result | Conclusion |
|---|---|---|---|---|
| Identification | In-house ID / label claim | Laccase (EC 1.10.3.2) | Conforms | Pass |
| Appearance | Visual | White to tan powder | Light tan powder | Pass |
| Enzyme Activity | Supplier laccase assay | NLT 10,000 U/g | 10,420 U/g | Pass |
| Activity Unit Definition | Supplier-defined unit | Report only | U/g reported | Pass |
| Odor | Organoleptic | Characteristic | Conforms | Pass |
| Solubility | Water solubility test | Dispersible / soluble in water | Conforms | Pass |
| Loss on Drying | Gravimetric | ≤ 8.0% | 4.2% | Pass |
| Lead (Pb) | ICP-MS / ICP-OES | ≤ 5.0 mg/kg | 0.20 mg/kg | Pass |
| Arsenic (As) | ICP-MS / ICP-OES | ≤ 3.0 mg/kg | 0.10 mg/kg | Pass |
| Cadmium (Cd) | ICP-MS / ICP-OES | ≤ 0.5 mg/kg | < 0.05 mg/kg | Pass |
| Mercury (Hg) | ICP-MS / ICP-OES | ≤ 0.5 mg/kg | < 0.01 mg/kg | Pass |
| Total Plate Count | Plate count | ≤ 50,000 CFU/g | 1.9 × 10³ CFU/g | Pass |
| Coliforms | Plate count | ≤ 30 CFU/g | < 10 CFU/g | Pass |
| E. coli | Absence test | Negative / 25 g | Not Detected | Pass |
| Salmonella | Absence test | Negative / 25 g | Not Detected | Pass |
Production Process
