Lime Pretreatment Associated Compositional and Ultrastructural Changes in Selected Root and Vegetable Processing Residues

Lime Pretreatment Associated Compositional and Ultrastructural Changes in Selected Root and Vegetable Processing Residues



Mithra. M. G, Padmaja. G



The study aimed at exploring the suitability of
processing residues from selected root and vegetables for bioethanol
production, which are otherwise environmental pollutants. The effect of
lime pretreatment at high (HT), low (LT) or room (RT) temperatures on
compositional and ultrastructural changes in peels of root crops (sweet
potato, elephant foot yam and tannia) and vegetable processing residues
(peels from ash gourd and mixed vegetable waste) was studied.
Pretreatment resulted in the removal of very little polysaccharides,
including starch from these biomasses. Hemicellulose was removed to a
higher extent in 24 h RT pretreatment (11.6-12.3%) compared to 7.3-8.5%
removal in HT pretreatment. Maximum lignin removal (ca. 33-38%) occurred
in RT pretreated (24 h) samples. Approximately 22-25.7% lignin was
removed during HT pretreatment (121 °C) for 30 min. which increased to
28-31% when prolonged to 60 min. Pretreatment Efficiency (PE) was low
(4.2-14.7%) in HT pretreatment, while 5.7-13.5% and 5.2-14.2% PE was
observed in LT and RT pretreatments respectively. Scanning electron
micrographs of lime pretreated biomass indicated that starch being a
major ingredient of the biomass under study, preferential
saccharification of starch by amylases might be necessary to expose the
cellulose and hemicellulose for their subsequent saccharification to
release fermentable sugars. 



10.22161/ijeab/2.1.40



http://ijeab.com/upload_document/issue_files/40%20IJEAB-JAN-2017-51-Lime%20Pretreatment%20Associated%20Compositional%20and%20Ultrastructural%20Changes.pdf



ijeab.com/submit-paper/

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