scholarly journals Effects of soaking aqueous ammonia pretreatment on selected properties and enzymatic hydrolysis of poplar (Populus trichocarpa) wood

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5618-5627
Author(s):  
Florentyna Akus-Szylberg ◽  
Andrzej Antczak ◽  
Janusz Zawadzki
Keyword(s):  
Enzymatic Hydrolysis ◽  
Aqueous Ammonia ◽  
Lignin Content ◽  
Populus Trichocarpa ◽  
Ammonia Concentration ◽  
Ammonia Solution ◽  
Degree Of Polymerization ◽  
Glucose Content ◽  
Two Temperatures ◽  
Ammonia Pretreatment

Effects of soaking aqueous ammonia pretreatment were considered for fast-growing poplar wood in the context of bioethanol production. The milled Populus trichocarpa wood with a particle size of 0.43 to 1.02 mm was pretreated at two temperatures (50 °C and 90 °C) and two concentrations of ammonia solution (15% and 20% w/w) for 20 h. The lignin content decreased by 46% in the biomass treated with the most severe conditions. After enzymatic hydrolysis, the sugar yield was analysed, and the results indicated that increased temperature and ammonia concentration during pretreatment resulted in higher glucose content. Additionally, changes in the degree of polymerization and available pore volume were investigated.

Effects of soaking aqueous ammonia pretreatment on chemical composition and enzymatic hydrolysis of corn stover

2021 ◽  
Vol 115 ◽  
pp. 29-36
Author(s):  
Florentyna Akus-Szylberg ◽  
Andrzej Antczak ◽  
Janusz Zawadzki
Keyword(s):  
Chemical Composition ◽  
Enzymatic Hydrolysis ◽  
Corn Stover ◽  
High Performance ◽  
Aqueous Ammonia ◽  
Ammonia Solution ◽  
Raw Material ◽  
Different Temperatures ◽  
Ammonia Pretreatment ◽  
Hydrolysis Of

Effects of soaking aqueous ammonia pretreatment on chemical composition and enzymatic hydrolysis of corn stover. The aim of this research was to investigate the effect of applying two different temperatures of the soaking aqueous ammonia treatment on the chemical composition and enzymatic hydrolysis yield of the corn stover. Native corn stover as well as solid fractions after 20 h of alkali pretreatment performed at 15% ammonia solution and at 50 °C or 90 °C were analysed in terms of cellulose, holocellulose, lignin and extractives content. Both untreated and treated samples were subjected to the enzymatic hydrolysis and hydrolysates were examined with a high performance liquid chromatography (HPLC). Results indicated a significant development of enzymatic digestibility of the SAA treated biomass. Furthermore, a 38.7% and a 68.9% delignification levels in the biomass treated with ammonia at respectively 50 °C and 90 °C process comparing to the raw material were achieved.

Evaluation of aqueous ammonia pretreatment for enzymatic hydrolysis of different fractions of bamboo shoot and mature bamboo

2014 ◽  
Vol 173 ◽  
pp. 198-206 ◽  
Author(s):  
Zhong Yang ◽  
Maomao Zhang ◽  
Donglin Xin ◽  
Jingfeng Wang ◽  
Junhua Zhang
Keyword(s):  
Enzymatic Hydrolysis ◽  
Aqueous Ammonia ◽  
Bamboo Shoot ◽  
Ammonia Pretreatment ◽  
Hydrolysis Of

Influence of pH and Cellic® CTec2 enzymes dose on the glucose yield after enzymatic hydrolysis of cellulose at 45 °C

2020 ◽  
Vol 112 ◽  
pp. 85-91
Author(s):  
Monika Marchwicka
Keyword(s):  
Enzymatic Hydrolysis ◽  
Populus Trichocarpa ◽  
Dry Mass ◽  
Glucose Content ◽  
Glucose Yield ◽  
Enzymatic Hydrolysis Of Cellulose ◽  
Hydrolysis Process ◽  
Hydrolysis Of Cellulose ◽  
Influence Of Ph ◽  
Hydrolysis Of

Influence of pH and Cellic® CTec2 enzymes dose on the glucose yield after enzymatic hydrolysis of cellulose at 45 °C. The enzymatic hydrolysis with the use of industrial enzymes Cellic® CTec2 (Novozymes, Denmark) was carried out within the conditions recommended by the manufacturer and literature. Cellulose obtained by the Kürschner-Hoffer method from a wood of 3-year-old poplar (Populus trichocarpa) was used for the study. Three pH values of 4.8, 5.0 and 5.5 were applied. Also, three amounts of enzymes were used: 25, 50 and 100 mg per 100 mg of the dry mass of cellulose for each pH used. The temperature was 45 °C. Samples were taken after 24 h and subjected to chromatographic analysis to determine the glucose content in the hydrolysates, and then the process parameters allowing for the highest glucose yield after the enzymatic hydrolysis process. The highest glucose yield was obtained for pH 5.0 and 100 mg of enzymes per 100 mg of the dry mass of cellulose – 79 %.

scholarly journals Effects of aqueous ammonia vapor on the color and chemical structure of Robinia pseudoacacia and oak woods

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5812-5828
Author(s):  
Agata Stachowiak-Wencek ◽  
Monika Bartkowiak ◽  
Magdalena Zborowska ◽  
Jan Bocianowski
Keyword(s):  
Chemical Structure ◽  
Color Change ◽  
Aqueous Ammonia ◽  
Robinia Pseudoacacia ◽  
Ammonia Concentration ◽  
Ammonia Solution ◽  
Ammonia Vapor ◽  
Total Color Change ◽  
The Fourier Transform ◽  
Robinia Pseudoacacia L

Aqueous ammonia vapors were found to affect the color and structure of oak (Quercus L.) and Robinia pseudoacacia L. woods. The modification process was performed using 5% or 10% ammonia concentration at a temperature of 120 °C, 130 °C, or 140 °C. Wood mass and volume change coefficients were determined. The degree of wood discoloration was determined using the Commission Internationale de l’Eclairage (CIE) Lab system, and the changes to the chemical structure were determined using the Fourier transform infrared (FTIR) technique. The samples darkened due to the modification. They also became less red and less yellow. It was found that Robinia wood was more discolored. The total color change (ΔE*) of Robinia wood ranged from 39.0 to 41.9, and of oak wood ranged from 26.8 to 33.3. The L* and b* color coordinates had a significant effect on the ΔE. Analysis of variance showed that in most cases both the concentration of the aqueous ammonia solution and the process temperature alone did not cause significant differences in the colour of the wood (GenStat 18ed (VSN International 2015)). However, the interaction between concentration and temperature was important. Analysis of wood structure via FTIR showed that during the applied treatment, wood underwent chemical changes and that the effects were different in the compared species.

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