烟草成分研究第三十八:卷烟烟气冷凝物中高分子量酸性色素来源的证据

R. Stedman, R. C. Benedict, M. Dymicky, D. G. Bailey
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摘要

不同条件下从卷烟烟气中分离得到的酸性棕色色素的收率无显著差异;然而,在-79°C的陷阱中或在室温下的丙酮溶液中,冷凝物的长时间储存可能存在产率小幅增加的趋势。当颜料立即从新鲜制备的冷凝物中分离出来时,颜料亚组分的分子量是可变的。在所有情况下,冷凝物的储存导致颜料中高分子量亚组分的比例更高。叶子色素和凝析色素都在高温和低压下升华,产生一种升华物,其中包含一些分子质量与分离的凝析色素中的分子质量大致相同的亚组分。尼古丁可以通过收集系统中的人工反应或在分离过程中作为凝析色素中的一个片段获得。然而,以这种方式获得的尼古丁显然只占色素中可皂化总尼古丁的很小一部分。冷凝色素的醋酸部分不能通过这种人工反应获得。虽然冷凝色素的部分结构可能是通过收集系统中的反应或在分离过程中形成的,但没有证据表明冷凝色素主要是人工制品。
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Composition Studies on Tobacco XXXVIII: Evidence for the Origin of the High Molecular Weight, Acidic Pigment in Cigarette Smoke Condensate
Abstract The yields of acidic brown pigment isolated from cigarette smoke collected and stored under various conditions show no significant differences; however, some tendency may exist for a small increase in yield on extended storage of the condensate in traps at -79°C or in acetone solution at room temperature. The molecular weights of subfractions of the pigment are variable when the pigment is immediately isolated from freshly prepared condensate. Storage of condensate results in a higher proportion of high molecular weight subfraction in the pigment in all cases. Both leaf and condensate pigments sublime at high temperature and low pressure yielding a sublimate that contains some subfractions with molecular weights of the same general magnitude as those in the isolated condensate pigment. Nicotine may be acquired as a moiety in the condensate pigment through artifact reactions in the collection system or during the isolation. However, the nicotine acquired in this way apparently represents a very small amount of the total saponifiable nicotine in the pigment. The acetic acid moiety of the condensate pigment is not acquired by such artifact reactions. Although part of the condensate pigment structure may be formed through reactions in the collection system or during isolation, no evidence was obtained that the condensate pigment is largely an artifact.
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Beitrage zur Tabakforschung International/ Contributions to Tobacco Research
Beitrage zur Tabakforschung International/ Contributions to Tobacco Research Agricultural and Biological Sciences-Agronomy and Crop Science
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