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Two new macrolide derivatives, madangolide (2) and laingolide A (3), have been isolated from the cyanobacterium Lyngbya bouillonii, collected in Papua New Guinea. Their structures (without stereochemistry) have been established by detailed high-field 1D and 2D NMR studies and, in the case of 3, by comparison with the spectroscopic data of laingolide (1), previously isolated from the same organism.

A novel 16-membered macrolide linked to a 2,3,4-tri-O-methyl-6-deoxy-α-mannopyranoside, lyngbyaloside (1), has been isolated from the blue-green alga Lyngbya bouillonii, collected on Laing Island (Papua New Guinea). Its structure has been established by a detailed high-field 2D NMR study. The relative configuration of 8 out of the 13 stereogenic carbon atoms is proposed from the analysis of NOE difference experiments.

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We studied the removal of nitrogen oxides pollutants via TiO 2 Degussa P25 powder by photocatalysis. Parameters such as mass of catalyst, geometric irradiated surface, catalyst morphology, and thermal treatment were tested to explain the photocatalytic concentration decrease of nitrogen oxides. According to our working conditions, the conversion rates increased until an optimal value of the TiO 2 weight, 35% of NO concentration and around 20% of NOx, was decomposed by the photocatalysis. The NOx removal increased proportionally with the irradiated geometric surface. The structural transformation of anatase to rutile performed by thermal treatment involved the decrease of the photocatalytic activity.

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