Axinellin A and B: Two New Pyrrolactam Alkaloids from Axinella sp.
Two new pyrrolactam alkaloids, axinelline A (1) and B (2), were isolated from the n-BuOH extract of marine sponge Axinella sp. The structures of these compounds were elucidated on the basis of spectroscopic methods (HR-ESI-MS, 1D and 2D NMR).
Isolation and structure of axinastatin 5 from a republic of comoros marine sponge
Abstract The new cancer cell growth (human and murine) inhibitory (GI 50 0.3 to 3.3 μg/ml) cyclo -octapeptide axinastatin 5 ( 2 ) was isolated in 3.8 x 10 −7 % yield from the Western Indian Ocean marine sponge Axinella cf. carteri . Structural elucidation was achieved by high field (400 and 500 MHz) 2 D-NMR techniques and the amino acid sequence was confirmed by results of NMR and high resolution mass spectral MS/MS interpretations. Other peptide cancer cell growth inhibitory constituents of this orange sponge were found to be the cyclic hepta- and octapeptides axinastatin 1 and hymenistatin 1 (1).
Thermodynamics on the Carbochlorination of Titanium-bearing Ores
The equilibrium compositions of the multi-component, multi-phase and multi-reaction system of carbochlorination of titanium-bearing ores are calculated with HSC, a computational chemistry software. The thermodynamic equilibrium calculation of the reaction system shows that a complete conversion of titanium-bearing ores is feasible at a temperature near 200oC. At temperatures ranging from 800 to 1600oC, the products of the reaction system are all in gaseous phase. Thermodynamic analysis accords with the industrial practice. The simulated results provide reasonable scientific basis for improving suitable technological conditions of the carbochlorination reduction.