Water hyacinth (Eichhornia crassipes) is considered as perennial aquatic plants in Southeast Asia with a high productivity and low requirement for industry, thus causing an obstruction for transportation. In the present study, lignin was extracted from E. crassipes by using microwave-assisted extraction. The optimal conditions of the alkaline pretreatment were investigated by varying chemical concentrations, reaction temperatures and times to maximize the amount of the lignin yield. Maximum lignin yield (94%) was found when using 15:1 liquid-to-solid ratio (LSR) and 0.5% (w/v) NaOH at 140 °C for 15 min. Isolated lignin was characterized by Fourier transform infrared spectrometer (FTIR) and UV-VIS spectrometer. The results were indicated that the alkaline pretreatment (saponification) at mild conditions induced cleavage of ester linkages joining phenolic acid bridge between polysaccharide and lignin.

Microwave-assisted extraction of lignin from water hyacinth (Eichhornia crassipes)

255th National Meeting (2018)

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