Chlorine/UV treatment of anatoxin-a by activation of the secondary amine functional group

A UV treatment process with prechlorination promotes the direct UV photodegradation of anatoxin-a by forming an N–Cl bond on the amine group.

Versatile Synthetic Route for Resveratrol Modification via Amine Functionalization

Resveratrol derivatives containing a primary amine functional group were synthesized by an introduction of N-Boc-bromoethylamine to resveratrol using Williamson ether synthesis and subsequent deprotection of the Boc group with trifluoroacetic acid. After conjugation of fluorescent NBD-F or rhodamine B with isothiocyanate (Rhd B-ITC) using the amine group, resveratrols modified with NBD or Rhd B (Resveratrol-NBD and Resveratrol-Rhd B, respectively) were successfully obtained.

Application of Snail Shell Chitosan as a Bioadsorbent in Removal of Copper (II) Ions from Wastewater

Recently, various adsorbents have been employed in removing different heavy metals from wastewater particularly those that are toxic to man. This study was therefore conducted to examine the potency of chitosan obtained from snail shells to remove copper from wastewater by adsorption. The chitosan was subjected to Fourier transform infrared (FTIR) analysis which showed a strong band at 3425.69cm-1 that can be attributed to N-H and O-H stretching. The peak observed at 2939.61cm-1 indicated symmetric alkane -C-H stretching vibration or -OH stretch of carboxylic acids while that of 2546.12cm-1 can be assigned to -C≡C stretching vibration of alkynes. The presence of residual N acetyl group was confirmed by the peak at 1643.41cm-1 (C=O stretching of amide I) and the peak at 1489.10cm-1 may be attributed to glycosidic linkage. The absorption band at 1149.61cm-1 can be attributed to be asymmetric stretching of the C-O-C bridge. The adsorption of copper by the chitosan was also studied under the effects of some process parameters and it was observed that removal efficiency of the chitosan increased with increase in contact time, adsorbent dosage and pH but decreased with increase in initial metal concentration. The adsorption of the copper ions was found to be aided by the presence of amine functional group on the chitosan and the mechanism of adsorption was chemisorption as the equilibrium data obtained from the study fitted better into the Langmuir isotherm model.

Investigation of the Binding Affinity of a Broad Array of l-Fucosides with Six Fucose-Specific Lectins of Bacterial and Fungal Origin

Series of multivalent α-l-fucoside containing glycoclusters and variously decorated l-fucosides were synthesized to find potential inhibitors of fucose-specific lectins and study the structure-binding affinity relationships. Tri- and tetravalent fucoclusters were built using copper-mediated azide-alkyne click chemistry. Series of fucoside monomers and dimers were synthesized using various methods, namely glycosylation, an azide-alkyne click reaction, photoinduced thiol-en addition, and sulfation. The interactions between compounds with six fucolectins of bacterial or fungal origin were tested using a hemagglutination inhibition assay. As a result, a tetravalent, α-l-fucose presenting glycocluster showed to be a ligand that was orders of magnitude better than a simple monosaccharide for tested lectins in most cases, which can nominate it as a universal ligand for studied lectins. This compound was also able to inhibit the adhesion of Pseudomonas aeruginosa cells to human epithelial bronchial cells. A trivalent fucocluster with a protected amine functional group also seems to be a promising candidate for designing glycoconjugates and chimeras.

A NiII complex of the tetradentate salen ligand H2LNH2 comprising an anchoring –NH2 group: synthesis, characterization and electrocatalytic CO2 reduction to alcohols

A new salen ligand with an anchoring free amine functional group in the ligand backbone and the corresponding NiII complex [NiIILNH2] (1) were synthesized and characterized. Complex 1 electrocatalytically reduced CO2 to alcohols.

C–H imidation: a distinct perspective of C–N bond formation

The direct imidation strategy proficiently constructs C–N bonds and creates the useful amine functional group in the molecular template.

CO2 capture under humid conditions in NH2-MIL-53(Al): the influence of the amine functional group

NH2-MIL-53(Al) exhibited a considerable stronger affinity to water than MIL-53(Al). Thus, the hydrophobicity (shown by in situ FTIR) of the pores within MIL-53(Al) enhanced the CO2 adsorption.

Heavy Metal Ions Removal Using Amine-Functionalized Mesoporous Adsorbents

In the present work, the adsorption of heavy metal ions using amine-functionalized MCM-41 was investigated. Amine-functionalized MCM-41 was synthesized by incorporation of tertiary amine functional group namely 3-[2-(2-aminoethylamino) ethylamino] propyltrimethoxysilane (AEPTMS) into MCM-41 through co-condensation method. The resultant adsorbents were characterized using elemental analysis, FTIR, and N2 adsorption-desorption. Amine-functionalized MCM-41 showed higher Cu2+ adsorption capacity of 4.52 mg/L compared to 0.94 mg/L for MCM-41 .