Isolation and characterization of two endo-β-glucanases from solid-state cultures of the aerobic fungus Penicillium capsulatum

1991 ◽  
Vol 13 (6) ◽  
pp. 462-469 ◽  
Author(s):  
Ita C. Connelly ◽  
Michael P. Coughlan
Keyword(s):  
Solid State ◽  
Isolation And Characterization ◽  
Penicillium Capsulatum

scholarly journals Extraction and Physicochemical Characterization of Chitin Derived from the Asian Hornet, Vespa velutina Lepeletier 1836 (Hym.: Vespidae)

2019 ◽  
Author(s):  
Xesús Feás ◽  
M. Pilar Vázquez-Tato ◽  
Julio A. Seijas Vázquez ◽  
Francisco Fraga-López
Keyword(s):  
Solid State ◽  
Model Fitting ◽  
Physicochemical Characterization ◽  
Frequency Factor ◽  
Alternative Source ◽  
Promising Alternative ◽  
Vespa Velutina ◽  
Model Free ◽  
Isolation And Characterization

The isolation and characterization of chitin (CHI) obtained from Vespa velutina (CHIVV) is described. Moreover, a trapping procedure is presented to selectively catch the invasive species. The chitin contents of dry Vespa velutina was observed to be 11.7 %. The physicochemical properties of CHIVV was characterized by Fourier transform infrared spectroscopy (FTIR), solid-state NMR (ssNMR), elemental analysis (EA), scanning electron microscopy (SEM) and thermogravimetric analysis (TG). Obtained CHIVV is close to pure (43, 47% C, 6.94% H, and 6.85% N) and full acetylated with a value of 95.44%. Also, lifetime and kinetic parameters such as activation E and the frequency factor A using model-free and model-fitting methods, were determined. For CHIVV the solid state mechanism that follows the thermodegradation is of type F2 (Random nucleation around two nuclei). Vespa velutina chitin should not be used at temperatures above 60ºC, since its half-life would be only one year, and from an industrial point of view it would not be profitable. Based on certain factors such as the current and probable continued abundance of Vespa velutina and the quality of the product obtained, the invasive Asian hornet is a promising alternative source of chitin.

scholarly journals Extraction and Physicochemical Characterization of Chitin Derived from the Asian Hornet, Vespa velutina Lepeletier 1836 (Hym.: Vespidae)

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 384 ◽  
Author(s):  
Xesús Feás ◽  
M. Pilar Vázquez-Tato ◽  
Julio A. Seijas ◽  
Anna Pratima G. Nikalje ◽  
Francisco Fraga-López
Keyword(s):  
Solid State ◽  
Model Fitting ◽  
Physicochemical Characterization ◽  
Frequency Factor ◽  
Alternative Source ◽  
Promising Alternative ◽  
Vespa Velutina ◽  
Model Free ◽  
Isolation And Characterization

Fifteen years ago, at least one multimated female yellow-legged Asian hornet (Vespa velutina Lepeletier 1836) arrived in France, which gave rise to a pan-European invasion. In this study, the isolation and characterization of chitin (CHI) that was obtained from Vespa velutina (CHIVV) is described. In addition, an easy procedure is carried out to capture the raw insect, selectively and with high rates of success. The chitin contents of dry VV was observed to be 11.7%. Fourier transform infrared spectroscopy (FTIR), solid-state NMR (ssNMR), elemental analysis (EA), scanning electron microscopy (SEM), and thermogravimetric analysis (TG) characterized the physicochemical properties of CHIVV. The obtained CHIVV is close to pure (43.47% C, 6.94% H, and 6.85% N), and full acetylated with a value of 95.44%. Additionally, lifetime and kinetic parameters such as activation E and the frequency factor A using model-free and model-fitting methods, were determined. For CHIVV the solid state mechanism that follows the thermodegradation is of type F2 (random nucleation around two nuclei). The invasive Asian hornet is a promising alternative source of CHI, based on certain factors, such as the current and probable continued abundance of the quantity and quality of the product obtained.

Isolation and characterization of a lithiated pyridine – aggregation in the solid state and in solution

2020 ◽  
Vol 56 (30) ◽  
pp. 4160-4163 ◽  
Author(s):  
Nadja M. C. Schmidlin ◽  
Harald Scherer ◽  
Anke Hoffmann ◽  
Tobias Böttcher
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Isolation And Characterization

The synthesis, isolation and characterization of the pyridyllithium compound 4-Li-2,6-Mes2py is reported. The crystal structure determination revealed a dimer in the solid state. In solution the pyridyllithium was identified as a monomer.

Sign in / Sign up

Export Citation Format

Share Document