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Bioresour Technol. 2017 Jan;224:465-472. doi: 10.1016/j.biortech.2016.11.108. Epub 2016 Nov 29.

Stimulatory effect and adsorption behavior of rhamnolipids on lignocelluloses degradation system.

Author information

1
Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China.
2
Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China. Electronic address: qzhzhang@des.ecnu.edu.cn.

Abstract

Di-rhamnolipid and mixed rhamnolipid were added to rice straw degrading system to investigate their mechanism of stimulatory effect. By batch adsorption experiments, it was shown that the equilibrium adsorption time of rhamnolipids on rice straw single system was the shortest (50min). The adsorption capacity of Trichoderma reesei single system was the strongest, whose Qe,exp for di-rhamnolipid and mixed rhamnolipid was 10.57×10-2mg·g-1 and 8.13×10-2mg·g-1, respectively. The adsorption of rhamnolipids on consortia system was not the simple adduct of the two single systems. The adsorption of rhamnolipids on the three different systems might belong to chemisorptions. SEM and FTIR analyses were used to observe the morphology and to analyze the chemical functions in lignocellulosic biomass degradation with rhamnolipid. It was shown that after addition of rhamnolipids, the basic tissue in rice straw was severely destroyed and hydrogen bond was formed between biosurfactant and bacteria in lignocellulose degrading system.

KEYWORDS:

Adsorption behavior; Lignocellulose; Rhamnolipids; Stimulatory effect

PMID:
27923607
DOI:
10.1016/j.biortech.2016.11.108
[Indexed for MEDLINE]

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