To improve the solubility, prymnesins were converted into N-acetates by the reaction with Ac2O in an i-PrOH-water mixture (3:2). In addition, 13C-enriched toxins were also obtained by culturing this microalga in the medium containing Na213CO3 to facilitate the use of 13C NMR ...
To improve the solubility, prymnesins were converted into N-acetates by the reaction with Ac2O in an i-PrOH-water mixture (3:2). In addition, 13C-enriched toxins were also obtained by culturing this microalga in the medium containing Na213CO3 to facilitate the use of 13C NMR ...
Experimental data of molecular weight (MW) and degree of deacetylation (DDA) determinations for low molecular weight chitosans (LMWCs). LMWC MW (kDa) Depolymerization time (h) Experimental MW (kDa) DDA % Molar ratio of chitosan:Ac2O LMWC MW (kDa) Experimental DDA% By UV/visible By 1H-...
After neutralized with AcOH and evaporated to dryness, the residue was converted into alditol acetates with Ac2O for 1 h at 100 ◦C. The GC-MS analysis was referenced to the previous report [9]. To quantify the uronic acid content in the structure, both were subjected to carboxyl-...
Acetylation of the Me-alditols was performed in pyridine–Ac2O (200 µL; 1:1, v/v), heated for 30 min at 100 ºC. The resulting alditol acetates were analyzed by GC-MS, and identified by their typical retention times and electron impact profiles. Gas liquid chromatography- mass ...
molecules Article Cationic High Molecular Weight Lignin Polymer: A Flocculant for the Removal of Anionic Azo-Dyes from Simulated Wastewater Shoujuan Wang 1, Fangong Kong 1,*, Pedram Fatehi 2,* ID and Qingxi Hou 3 1 Key Laboratory of Paper Science and Technology of Ministry of Education, Qilu...
Ftihneallpyr, othpeoCse, dH,stNruecletumreenst.al analyses of all of the synthesized compounds were in agreement with the proposed structures. Cl Cl NH2 OH + O Cl 1 2 O Cl TEA, CH2Cl2 O NH OH Ac2O O 3 N O O 4 NH2NH2 Cl Cl O NH Ar HN N ArCHO/ AcOH cat. O NH HN NH2 ...