Due to the high interest in the subject and to the promising results obtained, in the last few months new papers have appeared on the topic of reducing tobacco smoke toxicity by zeolites and aluminosilicates. [15] studied the effect of different molecular sieve materials on the elimination of specific tobacco nitrosamines. They tested A, ZSM5 and USY type zeolites selleck kinase inhibitor as well as mesoporous materials such as MCM and SBA-15. They also studied the effect of the morphology

of the materials and the acidity and concluded that the mesoporous materials were the more effective in reducing such compounds. The effect of ferric zeolites in reducing specific tobacco nitrosamines in tobacco smoke was also studied [16]. They concluded that the iron cations exchanged in the zeolite were more efficient than iron oxide particles NVP-BKM120 chemical structure deposited on the catalyst by impregnation. These studies on reducing toxic compounds by zeolites or aluminosilicate

materials were carried out on reference cigarettes or on a single commercial brand, and the results have to be understood as specific to the tobacco blends or cigarette configurations investigated in each work. Some interesting studies comparing the yield of smoke components among a large number of commercial brands under different smoking conditions and cigarettes design characteristics have been published. [14] studied the content of PAH in MSS of 59 commercial cigarettes brands from Greece. The dioxin

and dioxin-like compounds content in MSS of commercial US brands was studied by [28]. [22] compared the smoke yields of 10 commercial brands sold in Spain, and more recently these authors [23] compared the smoke composition of 11 roll your own (RYO) commercial brands with a reference tobacco. In general, it can be said that the relative yield (both, on per cigarette or amount of smoked tobacco basis) of individual Bumetanide compounds varies considerably among the different brands. The differences in the tobacco type, design configuration and smoking regime may affect differently the yield of any particular toxic compound evolved. The objective of the present paper is to study the effect of the porous structure and acidity of three additives on the smoke composition when smoking a series of commercial cigarette brands, in order to obtain valuable data of practical potential utility of these solids for reducing the toxicity of tobacco smoke. For this purpose, the materials employed were two microporous zeolites with similar porous texture but different acidity, i.e. a USY zeolite as received from the supplier in its acid form (HUSY) and another one Na exchanged (NaY), as well as one of the mesoporous Al-MCM-41 synthesized in our laboratory.