Fig. 4

Fourier transform infrared spectra of raw and delignified pineapple leaf waste. Maximum delignification of pineapple leaf waste has been obtained at solid loading 25% (w/v), incubation time 5.30 h, 45 °C, pH 6.16 and enzyme concentration 582.82 (IU/mL). Changes of the functional groups and compositional modifications in laccase delignified substrate against the raw substrate have been studied