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Reduction of polycyclic aromatic hydrocarbons in tobacco smoke using palladium salts

a technology of aromatic hydrocarbons and palladium salts, which is applied in the field of reduction of polycyclic aromatic hydrocarbons in tobacco smoke using palladium salts, can solve the problems of requiring activation with nitrate or nitrite, and the loss of metallic particles in tobacco cut filler

Inactive Publication Date: 2005-03-24
PHILIP MORRIS USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention concerns a catalyst system useful for removing PAHs, including BaP, from both mainstream and sidestream tobacco smoke. The present invention overcomes the problems associated with the above-noted catalyst system by eliminating the need for (1) particles, (2) reduction of the transition metal, and (3) a nitrate or nitrite activator.

Problems solved by technology

A major disadvantage with this catalyst system, however, is that it requires activation with nitrate or nitrite, which therefore must be present in the tobacco along with the metallic particles.
Finally, such metallic particles are typically lost from tobacco cut filler during the cigarette manufacturing process.

Method used

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  • Reduction of polycyclic aromatic hydrocarbons in tobacco smoke using palladium salts
  • Reduction of polycyclic aromatic hydrocarbons in tobacco smoke using palladium salts
  • Reduction of polycyclic aromatic hydrocarbons in tobacco smoke using palladium salts

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Tobacco was treated by spraying either a Pd(OOCCH3)2 solution or a Pd(NO3)2 solution onto “as is” tobacco. The tobacco was then dried. The concentration of metal in the resultant treated tobacco was 0.05% (w / w). The Pd(NO3)2 solution was prepared by dissolving the salt in water. The Pd(OOCCH3)2 solution was prepared by dissolving the salt in one part of acetone, followed by the addition of nine parts of water. Subsequently, the mainstream smoke of treated and untreated tobacco was analyzed for the presence of the following PAHs: phenanthrene, benzo(a)antracene (BaA), pyrene, and BaP. The percent reduction in the level of each of these PAHs was calculated using the following formula: 100(1-(level of the PAH in mainstream smoke of treated tobacco / level of the PAH in mainstream smoke of untreated tobacco)), wherein the PAH is phenanthrene, BaA, pyrene, or BaP. The results of these experiments are given in FIG. 1.

example 2

[0019] Tobacco was treated by spraying either a Pd(OOCCH3)2 solution or a Cu(OOCCH3)2•H2O solution onto “as is” tobacco. The tobacco was then dried. The Pd(OOCCH3)2 solution was prepared as described in Example 1. The Cu(OOCCH3)2•H2O solution was prepared by dissolving the salt in water. Subsequently, the mainstream smoke of treated and untreated tobacco was analyzed for the presence of BaP and other PAHs. The percent reduction in BaP level was calculated using the following formula: 100(1-(level of BaP in mainstream smoke of treated tobacco / level of BaP in mainstream smoke of untreated tobacco)). The results of these experiments are given in FIG. 2.

example 4

[0020] Tobacco was treated by spraying onto “as is” tobacco either a Pd(OOCCH3)2 solution or a Pd(OOCCH3)2 solution additionally containing mannitol and urea. The tobacco was then dried. The concentration of palladium in the resultant treated tobacco was 1.4% (w / w). The concentrations of mannitol and urea in the resultant treated tobacco containing these compounds was 10% and 5% (w / w), respectively. Subsequently, the mainstream smoke of treated and untreated tobacco was analyzed for the presence of BaP. The percent reduction in BaP level was calculated using the formula noted in Example 2. The results of these experiments are given in FIG. 3.

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Abstract

Methods for treating tobacco which result in the reduction of selected compounds from the tobacco smoke, and corresponding smoking articles containing this treated tobacco, are disclosed. In these methods, a solution containing a palladium salt is applied to the tobacco, preferably by spraying. The palladium salt preferably contains nitrate, chloride, acetate, citrate, gluconate, or salicylate as the anion. After application of the solution, the tobacco is preferably dried in an oven, by forced air, or by natural evaporation. The palladium in the treated tobacco results in the reduction in the level of polycyclic aromatic hydrocarbons, especially benzo(a)pyrene, from the total particulate matter in mainstream and sidestream smoke of the treated tobacco. The addition of mannitol and / or urea to the tobacco, and introduction of ventilation in a cigarette containing the treated tobacco, enhance the ability of palladium to reduce the level of polycyclic aromatic hydrocarbons in the smoke.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention is broadly concerned with tobacco containing at least one additive which reduces the level of polycyclic aromatic hydrocarbon (PAH) in smoke. More particularly, the invention relates to tobacco treated with a palladium salt to improve the quality of smoke by removing PAHs, especially benzo(a)pyrene (BaP), from the total particulate matter in tobacco smoke. [0003] 2. Description of the Related Art [0004] It is desirable to remove certain compounds, including PAHs, from smoke. Catalyst systems have been used in the past to reduce the levels of such compounds from tobacco smoke. For example, WO 02 / 37990 describes a catalyst system employing particles composed of metallic palladium. A major disadvantage with this catalyst system, however, is that it requires activation with nitrate or nitrite, which therefore must be present in the tobacco along with the metallic particles. Moreover, preparation of...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A24B3/10A24B15/28A24B15/42
CPCA24B15/246A24B15/42A24B15/287A24B15/28
Inventor OLEGARIO, RAQUEL M.LI, SANBANYASZ, JOSEPH L.SHAFER, KENNETH H.
Owner PHILIP MORRIS USA INC
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