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Effect of laccase treatment on lignin removal of PHL-2nd. The other treating conditions: a pH 5, temperature 45 °C and time 3 h; b laccase dosage 5 U/g, temperature 45 °C and time 3 h; c laccase dosage 5 U/g, pH 5 and time 3 h; d laccase dosage 5 U/g, pH 5 and temperature 45 °C
