SUMMARYYidds in sidestream smoke (SS) and mainstream smoke (MS) and sidestream smoke to mainstream smoke distribu~ tion ratios (SS/MS) of 34 bases were examined from four types of cigarettes made from Bright, Hurley, Turkish and domestic (c.v. Matsukawa) tobacco. Irrespective of to· bacco variety, major bases in sidestream smoke were am~ monia, nicotine, 3-vinylpyridine, pyridine and 3-hydroxypyridine, and those in mains.tream smoke were nicotine, 3-hydroxypyridine, ammonia, 3-picoline and pyridine. SS/ MS ratios of the bases were generally larger than 1.0 and the largest SS/MS ratio was that of ammonia, followed by those of 3-vinylpyridine, 3-cyanopyridine, nicotyrine and pyridine in that order. The preponderance of bases in sidestream smoke over mainstream smoke might be one of the major causes for the differences in aroma and irritation between sidenream smoke and mainstream smoke. Hauptstromrauch-Verbaltnis der Hasen lag im allgemeinen Uber 1,0, wobei fUr Ammoniak der hOcbste Wert gefunden wurde und 3· Vinylpyridin, 3-Cyanpyri· din, Nicotyrin und Pyridin mit jeweils abnehmenden Werten folgten. Der hinsichdich Aroma und Reizwirkung zwischen Haupt-und Nebenstromrauch :zu beobachtende Unterschied kOnnte unter anderem vor allem auch darin begriindet sein, daB im Nebenstromrauch Hasen in stirkerem AusmaB vorkommen als im Hauptstromrauch. RESUME Prellant des echantillons de cigarettes confectionnees a partir de 4 types de tabac differents (Virginie, Hurley, tabac turc et variete locale de tabac japonais Matsu· kawa), on determina 34 bases dans le courant principal (MS) et le courant secondaire (SS) de la fumee et l'on calcula le rapport flux secondaire I flux principal (SS/ MS). IndCpendamment du type de tabac etudie, les bases presentes en plus grandes quantites dans le courant secondaire de la fumee etaient: l'ammoniaque, la nicotine, la 3-vinylpyridine, la pyridine et la 3-hydroxypyridine, alors que, dans le courant principal, on trouvait surtout de la nicotine, de la 3-hydroxypyridine, de l'ammoniaque, de la 3-picoline et de la pyridine. Le rap· port flux secondaire I flux principal, concernant les bases, se situait generalement au-dessus de 1,0; le taux le plus eleve fut atteint par l'ammoniaque suivie dans l'ordre par la 3-vinylpyridine, la 3-cyanopyridine, la nicotyrine et la pyridine. Les differences observees entre la fumee du ,flux principal et la fumee du flux secondaire, eu egard a l'arOme et a l'effect irritant, pourraient s'expliquer entre autres, par une plus grande quantitC de bases contenue dans le flux secondaire plutOt que dans le flux principal.

Yields in sidestream (SS) and mainstream (MS) smokes and sidestream to mainstream distribution ratios (SS/MS) of acidic components were examined for four types of cigarette made from Bright, Burley, Turkish and do~ mestic (c.v. Matsukawa) tobacco. Of the acidic corn~ ponents, formic and acetic acids were analysed by GC following n~butyl esterification, and acids other than formic and acetic acids and phenols similarly after trimethylsilylation. In acidic fractions of sidestream and mainstream smokes of four types of cigarettes, major phenolic components were phenol, catechol and hydroquinone, and major acids were formic, acetic, lactic, glycolic and succinic.

Yields in sidestream smoke (SS) and mainstream smoke (MS) and sidestream smoke to mainstream smoke distribution ratios (SS/MS) of middle and higher boiling compounds, including neutral ones, were investigated for four types of unblended cigarette (bright, Burley, Turkish and domestic (cv. Matsukawa)). Both sidestream and mainstream smokes were separately collected with a combination of a glass fiber filter assembly, a small Elmenhorst cold trap and a liquid trap containing acetone cooled by dry ice - methanol. Of the 31 components quantitatively determined by gas chromatography, nicotine and acetic acid were the predominant components in both sidestream and mainstream smokes from all types of tobacco, followed by limonene, phenol, 3-vinylpyridine and 2-furaldehyde in sidestream smoke and neophytadiene, 3-hydroxypyridine, phenol and acetamide in mainstream smoke. The SS/MS ratios of the major compounds were as follows: pyridine, 10.2-13.3; limonene, 4.3-2.1; 3-picoline, 5.2-10.1; 2-cyclopentenone, 2.9-3.8; 2-furaldehyde, 4.9-7.4; pyrrole, 9.0-13.7; furfuryl alcohol, 3.0-4.8; acetamide, 0.8-1.7; 2.4-pentadien-4-olide, 5.2-8.9; neophytadiene, 1.0-1.8.

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