Efficient alkaloid capture from water using a charged porous organic polymer.

Berberine hydrochloride (BH), an important alkaloid, can be captured from water and released in organic solution circularly by a charged porous polymer (TPB-HCP), which is hypercross-linked using the cost-effective Friedel-Crafts reaction using sodium tetraphenylborate as the monomer. With high BET surface area, hierarchical porous structure and charged characteristics, TPB-HCP displays excellent adsorption capacity for BH owing to the synergistic effects of size matching and electrostatic interaction.

[Synthesis, characterization and relaxivity of dimeric DTPA-gadonium (III) complexes with long chain alkyl esters of L-lysine].

To look for new MRI (magnetic resonance imaging) contrast agents with higher relaxivity as well as liver-selecsivity, four novel ester-amino ligands were synthesized by bis-acylation of octadecanyl, hexadecanyl, tetradecanyl and dedecanyl L-lysine with diethylenetriaminepentaacetic acid mono-anhydride (DTPA-MA), respectively. The corresponding dimeric Gd(III) complexes were gained by the reaction of these ligands with GdCl3 x 6H2O. All ligands and complexes were characterized by FTIR, 1H NMR and elemental analysis. The longitudinal relaxation time (T1) was measured, and relevant longitudinal relaxivity (R1) of these neatral binuclear Gd(III) complexes is: 6.48, 6.02, 5.76 and 5.68 L x mmol(-1) x s(-1), respectively, and all are higher than that of Gd-DTPA (4.98 L x mmol(-1) x s(-1)) (300 MHz).