Influence of Alkali and Alkaline-Earth Metals on the Cleavage of Glycosidic Bond in Biomass Pyrolysis: A DFT Study Using Cellobiose as a Model Compound

2018 ◽  
Vol 122 (38) ◽  
pp. 7646-7658 ◽  
Author(s):  
Jyotsna S. Arora ◽  
Jia Wei Chew ◽  
Samir H. Mushrif
Keyword(s):  
Alkaline Earth ◽  
Model Compound ◽  
Alkaline Earth Metals ◽  
Dft Study ◽  
Glycosidic Bond ◽  
Biomass Pyrolysis

Unravelling the catalytic influence of naturally occurring salts on biomass pyrolysis chemistry using glucose as a model compound: a combined experimental and DFT study

2019 ◽  
Vol 9 (13) ◽  
pp. 3504-3524 ◽  
Author(s):  
Jyotsna S. Arora ◽  
Khursheed B. Ansari ◽  
Jia Wei Chew ◽  
Paul J. Dauenhauer ◽  
Samir H. Mushrif
Keyword(s):  
Metal Ions ◽  
Alkaline Earth ◽  
Model Compound ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Biomass Pyrolysis ◽  
Oil Composition ◽  
Compound A ◽  
Naturally Occurring ◽  
Bio Oil

Alkali and alkaline-earth metal loaded biomass pyrolysis highlights that different metal ions have different effects on bio-oil composition.

scholarly journals The Influence of Silicateins on the Shape and Crystalline Habit of Silica Carbonate Biomorphs of Alkaline Earth Metals (Ca, Ba, Sr)

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 438
Author(s):  
Nuria Sánchez-Puig ◽  
Mayra Cuéllar-Cruz ◽  
Selene R. Islas ◽  
Juana V. Tapia-Vieyra ◽  
Roberto A. Arreguín-Espinosa ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Model Compound ◽  
Earth Metal ◽  
Marine Sponges ◽  
Alkaline Earth Metals ◽  
Silyl Ether ◽  
Metal Carbonate ◽  
Condensation Activity

This contribution presents the effect of two ortholog enzymes from marine sponges called silicateins on the formation of silica carbonate biomorphs of alkaline metals (Ca, Ba, Sr). In vivo, these enzymes participate in the polymerization of silica. Silicateins from Tethya aurantia and Suberitis domuncula were produced recombinantly and presented different degrees of activity, as evidenced by their ability to cleave silyl ether-like bonds in a model compound. Biomorphs are typically inorganic structures that show characteristic shapes resembling those of biological structures such as helices, leaves, flowers, disks or spheres. Irrespective of the concentration or the enzyme used, the presence of silicateins inhibited the formation of classic morphologies of biomorphs, albeit to different extents. Thus, not only the silica condensation activity of the enzyme but also its ability to bind silica compounds is implicated in the inhibition process. The largest effect was observed for the strontium and barium biomorphs, leading to the formation of spheres similar to those observed in diatoms and Radiolaria rather than the classical non-symmetrical forms. Characterization of the samples using Raman spectroscopy showed that silicatein did not affect the crystalline structure of the alkaline earth metal carbonate but did modify the crystalline habit.

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