Unrevealing model compounds of soil conditioners impacts on the wheat straw autohydrolysis efficiency and enzymatic hydrolysis
Background: Soil-derived exogenous ash (EA) poses a challenge toward lignocellulosics autohydrolysis due to its buffering capacity. Previous works focusing on this phenomenon have failed to also investigate the role that soluble salts, and organic matter plays in this system. Herein, sodium phosphate and sodium humate were employed as model buffering compounds representing soluble salts and organic matter and dosed into a de-ashed wheat straw (DWS) autohydrolysis process to show the potential impacts of WS attached soil conditioners on the WS autohydrolysis efficiency which would further affect the enzymatic digestibility of autohydrolyzed WS.
Results: Results showed that with the increasing loadings of sodium phosphate and sodium humate resulted in elevated pH values (from 4.0 to 5.1 and from 4.1 to 4.7, respectively). Meanwhile, the reductions of xylan removal yields from ~84.3-61.4% to 72.3-53.0% by loading (1~30 g/L) sodium phosphate and sodium humate during WS autohydrolysis lead to a significant decrease of cellulose accessibilities which finally lead to a reduction of the enzymatic digestibility of autohydrolyzed WS from ~75.4-77.2% to 47.3-57.7%.
Conclusion: The existence of different types soil conditioner model compounds result in various component fractions from autohydrolyzed WS in the process of autohydrolysis. A lack of sufficient xylan removal was found to drive the significant decrease in enzymatic accessibility. The results demonstrated the various effects of two typical tested soil conditioners on WS autohydrolysis and enzymatic hydrolysis.
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Posted 19 Jun, 2020
On 13 Jul, 2020
On 05 Jul, 2020
On 20 Jun, 2020
Received 20 Jun, 2020
On 19 Jun, 2020
Invitations sent on 19 Jun, 2020
On 19 Jun, 2020
Received 19 Jun, 2020
On 18 Jun, 2020
On 18 Jun, 2020
On 07 Jun, 2020
Received 06 Jun, 2020
Received 01 Jun, 2020
On 29 May, 2020
Received 28 May, 2020
On 23 May, 2020
Invitations sent on 19 May, 2020
On 19 May, 2020
On 02 May, 2020
On 02 May, 2020
On 01 May, 2020
On 01 May, 2020
Unrevealing model compounds of soil conditioners impacts on the wheat straw autohydrolysis efficiency and enzymatic hydrolysis
Posted 19 Jun, 2020
On 13 Jul, 2020
On 05 Jul, 2020
On 20 Jun, 2020
Received 20 Jun, 2020
On 19 Jun, 2020
Invitations sent on 19 Jun, 2020
On 19 Jun, 2020
Received 19 Jun, 2020
On 18 Jun, 2020
On 18 Jun, 2020
On 07 Jun, 2020
Received 06 Jun, 2020
Received 01 Jun, 2020
On 29 May, 2020
Received 28 May, 2020
On 23 May, 2020
Invitations sent on 19 May, 2020
On 19 May, 2020
On 02 May, 2020
On 02 May, 2020
On 01 May, 2020
On 01 May, 2020
Background: Soil-derived exogenous ash (EA) poses a challenge toward lignocellulosics autohydrolysis due to its buffering capacity. Previous works focusing on this phenomenon have failed to also investigate the role that soluble salts, and organic matter plays in this system. Herein, sodium phosphate and sodium humate were employed as model buffering compounds representing soluble salts and organic matter and dosed into a de-ashed wheat straw (DWS) autohydrolysis process to show the potential impacts of WS attached soil conditioners on the WS autohydrolysis efficiency which would further affect the enzymatic digestibility of autohydrolyzed WS.
Results: Results showed that with the increasing loadings of sodium phosphate and sodium humate resulted in elevated pH values (from 4.0 to 5.1 and from 4.1 to 4.7, respectively). Meanwhile, the reductions of xylan removal yields from ~84.3-61.4% to 72.3-53.0% by loading (1~30 g/L) sodium phosphate and sodium humate during WS autohydrolysis lead to a significant decrease of cellulose accessibilities which finally lead to a reduction of the enzymatic digestibility of autohydrolyzed WS from ~75.4-77.2% to 47.3-57.7%.
Conclusion: The existence of different types soil conditioner model compounds result in various component fractions from autohydrolyzed WS in the process of autohydrolysis. A lack of sufficient xylan removal was found to drive the significant decrease in enzymatic accessibility. The results demonstrated the various effects of two typical tested soil conditioners on WS autohydrolysis and enzymatic hydrolysis.
Figure 1
Figure 2
Figure 3
Figure 4