Revista y Edición

Volumen 31 (2022): Edición 2 (July 2022)

Volumen 31 (2022): Edición 1 (March 2022)

Volumen 30 (2021): Edición 4 (November 2021)

Volumen 30 (2021): Edición 3 (July 2021)

Volumen 30 (2021): Edición 2 (May 2021)

Volumen 30 (2021): Edición 1 (March 2021)

Volumen 29 (2020): Edición 3 (December 2020)

Volumen 29 (2020): Edición 2 (August 2020)

Volumen 29 (2020): Edición 1 (April 2020)

Volumen 28 (2019): Edición 7 (December 2019)

Volumen 28 (2019): Edición 6 (August 2019)

Volumen 28 (2019): Edición 5 (May 2019)

Volumen 28 (2018): Edición 4 (December 2018)

Volumen 28 (2018): Edición 3 (October 2018)

Volumen 28 (2018): Edición 2 (August 2018)

Volumen 28 (2018): Edición 1 (April 2018)

Volumen 27 (2017): Edición 8 (December 2017)

Volumen 27 (2017): Edición 7 (September 2017)

Volumen 27 (2017): Edición 6 (April 2017)

Volumen 27 (2017): Edición 5 (January 2017)

Volumen 27 (2016): Edición 4 (October 2016)

Volumen 27 (2016): Edición 3 (July 2016)

Volumen 27 (2016): Edición 2 (April 2016)

Volumen 27 (2016): Edición 1 (January 2016)

Volumen 26 (2015): Edición 7 (September 2015)

Volumen 26 (2015): Edición 6 (June 2015)

Volumen 26 (2015): Edición 5 (March 2015)

Volumen 26 (2014): Edición 4 (December 2014)

Volumen 26 (2014): Edición 3 (September 2014)

Volumen 26 (2014): Edición 2 (July 2014)

Volumen 26 (2014): Edición 1 (April 2014)

Volumen 25 (2013): Edición 8 (December 2013)

Volumen 25 (2013): Edición 7 (September 2013)

Volumen 25 (2013): Edición 6 (June 2013)

Volumen 25 (2013): Edición 5 (March 2013)

Volumen 25 (2012): Edición 4 (December 2012)

Volumen 25 (2012): Edición 3 (August 2012)

Volumen 25 (2012): Edición 2 (June 2012)

Volumen 25 (2012): Edición 1 (February 2012)

Volumen 24 (2011): Edición 6 (November 2011)

Volumen 24 (2011): Edición 5 (May 2011)

Volumen 24 (2011): Edición 4 (January 2011)

Volumen 24 (2010): Edición 3 (November 2010)

Volumen 24 (2010): Edición 2 (July 2010)

Volumen 24 (2010): Edición 1 (April 2010)

Volumen 23 (2009): Edición 6 (December 2009)

Volumen 23 (2009): Edición 5 (September 2009)

Volumen 23 (2009): Edición 4 (May 2009)

Volumen 23 (2008): Edición 3 (December 2008)

Volumen 23 (2008): Edición 2 (August 2008)

Volumen 23 (2008): Edición 1 (April 2008)

Volumen 22 (2007): Edición 5 (June 2007)

Volumen 22 (2007): Edición 4 (January 2007)

Volumen 22 (2006): Edición 3 (October 2006)

Volumen 22 (2006): Edición 2 (July 2006)

Volumen 22 (2006): Edición 1 (April 2006)

Volumen 21 (2005): Edición 8 (December 2005)

Volumen 21 (2005): Edición 7 (October 2005)

Volumen 21 (2005): Edición 6 (July 2005)

Volumen 21 (2005): Edición 5 (April 2005)

Volumen 21 (2004): Edición 4 (December 2004)

Volumen 21 (2004): Edición 3 (October 2004)

Volumen 21 (2004): Edición 2 (July 2004)

Volumen 21 (2004): Edición 1 (March 2004)

Volumen 20 (2003): Edición 8 (December 2003)

Volumen 20 (2003): Edición 7 (November 2003)

Volumen 20 (2003): Edición 6 (July 2003)

Volumen 20 (2003): Edición 5 (March 2003)

Volumen 20 (2002): Edición 4 (December 2002)

Volumen 20 (2002): Edición 3 (August 2002)

Volumen 20 (2002): Edición 2 (June 2002)

Volumen 20 (2002): Edición 1 (February 2002)

Volumen 19 (2001): Edición 7 (October 2001)

Volumen 19 (2001): Edición 6 (July 2001)

Volumen 19 (2001): Edición 5 (April 2001)

Volumen 19 (2001): Edición 4 (January 2001)

Volumen 19 (2000): Edición 3 (October 2000)

Volumen 19 (2000): Edición 2 (July 2000)

Volumen 19 (2000): Edición 1 (April 2000)

Volumen 18 (1999): Edición 6 (December 1999)

Volumen 18 (1999): Edición 5 (July 1999)

Volumen 18 (1999): Edición 4 (April 1999)

Volumen 18 (1998): Edición 3 (December 1998)

Volumen 18 (1998): Edición 2 (August 1998)

Volumen 18 (1998): Edición 1 (April 1998)

Volumen 17 (1997): Edición 3 (December 1997)

Volumen 17 (1997): Edición 2 (September 1997)

Volumen 17 (1996): Edición 1 (December 1996)

Volumen 16 (1995): Edición 4 (November 1995)

Volumen 16 (1995): Edición 3 (July 1995)

Volumen 16 (1994): Edición 2 (June 1994)

Volumen 16 (1994): Edición 1 (May 1994)

Volumen 15 (1992): Edición 3 (November 1992)

Volumen 15 (1992): Edición 2 (April 1992)

Volumen 15 (1991): Edición 1 (August 1991)

Volumen 14 (1990): Edición 6 (June 1990)

Volumen 14 (1989): Edición 5 (October 1989)

Volumen 14 (1989): Edición 4 (February 1989)

Volumen 14 (1989): Edición 3 (January 1989)

Volumen 14 (1988): Edición 2 (October 1988)

Volumen 14 (1987): Edición 1 (December 1987)

Volumen 13 (1986): Edición 5 (December 1986)

Volumen 13 (1986): Edición 4 (August 1986)

Volumen 13 (1986): Edición 3 (July 1986)

Volumen 13 (1985): Edición 2 (December 1985)

Volumen 13 (1985): Edición 1 (January 1985)

Volumen 12 (1984): Edición 5 (November 1984)

Volumen 12 (1984): Edición 4 (July 1984)

Volumen 12 (1984): Edición 3 (February 1984)

Volumen 12 (1983): Edición 2 (June 1983)

Volumen 12 (1983): Edición 1 (February 1983)

Volumen 11 (1982): Edición 5 (November 1982)

Volumen 11 (1982): Edición 4 (August 1982)

Volumen 11 (1982): Edición 3 (January 1982)

Volumen 11 (1981): Edición 2 (September 1981)

Volumen 11 (1981): Edición 1 (March 1981)

Volumen 10 (1980): Edición 3 (October 1980)

Volumen 10 (1980): Edición 2 (July 1980)

Volumen 10 (1979): Edición 1 (December 1979)

Volumen 9 (1978): Edición 5 (December 1978)

Volumen 9 (1978): Edición 4 (July 1978)

Volumen 9 (1977): Edición 3 (October 1977)

Volumen 9 (1977): Edición 2 (June 1977)

Volumen 9 (1977): Edición 1 (April 1977)

Volumen 8 (1976): Edición 7 (October 1976)

Volumen 8 (1976): Edición 6 (June 1976)

Volumen 8 (1976): Edición 5 (March 1976)

Volumen 8 (1975): Edición 4 (December 1975)

Volumen 8 (1975): Edición 3 (August 1975)

Volumen 8 (1975): Edición 2 (May 1975)

Volumen 8 (1975): Edición 1 (January 1975)

Volumen 7 (1974): Edición 5 (September 1974)

Volumen 7 (1974): Edición 4 (April 1974)

Volumen 7 (1973): Edición 3 (November 1973)

Volumen 7 (1973): Edición 2 (June 1973)

Volumen 7 (1973): Edición 1 (January 1973)

Volumen 6 (1972): Edición 5 (October 1972)

Volumen 6 (1972): Edición 4 (August 1972)

Volumen 6 (1972): Edición 3 (March 1972)

Volumen 6 (1971): Edición 2 (September 1971)

Volumen 6 (1971): Edición 1 (July 1971)

Volumen 5 (1970): Edición 6 (December 1970)

Volumen 5 (1970): Edición 5 (November 1970)

Volumen 5 (1970): Edición 4 (August 1970)

Volumen 5 (1969): Edición 3 (December 1969)

Volumen 5 (1969): Edición 2 (August 1969)

Volumen 5 (1969): Edición 1 (June 1969)

Volumen 4 (1968): Edición 7 (December 1968)

Volumen 4 (1968): Edición 6 (November 1968)

Volumen 4 (1968): Edición 5 (July 1968)

Volumen 4 (1968): Edición 4 (May 1968)

Volumen 4 (1968): Edición 3 (February 1968)

Volumen 4 (1967): Edición 2 (October 1967)

Volumen 4 (1967): Edición 1 (August 1967)

Volumen 3 (1966): Edición 9 (December 1966)

Volumen 3 (1966): Edición 8 (December 1966)

Volumen 3 (1966): Edición 7 (November 1966)

Volumen 3 (1966): Edición 6 (September 1966)

Volumen 3 (1966): Edición 5 (May 1966)

Volumen 3 (1965): Edición 4 (October 1965)

Volumen 3 (1965): Edición 3 (August 1965)

Volumen 3 (1965): Edición 2 (May 1965)

Volumen 3 (1965): Edición 1 (April 1965)

Volumen 2 (1964): Edición 7 (November 1964)

Volumen 2 (1964): Edición 6 (October 1964)

Volumen 2 (1964): Edición 5 (May 1964)

Volumen 2 (1964): Edición 4 (February 1964)

Volumen 2 (1963): Edición 3 (October 1963)

Volumen 2 (1963): Edición 2 (June 1963)

Volumen 2 (1963): Edición 1 (March 1963)

Volumen 1 (1962): Edición 10 (December 1962)

Volumen 1 (1962): Edición 9 (December 1962)

Volumen 1 (1962): Edición 8 (November 1962)

Volumen 1 (1962): Edición 7 (November 1962)

Volumen 1 (1962): Edición 6 (July 1962)

Volumen 1 (1962): Edición 5 (February 1962)

Volumen 1 (1961): Edición 4 (November 1961)

Volumen 1 (1961): Edición 3 (August 1961)

Volumen 1 (1961): Edición 2 (May 1961)

Volumen 1 (1961): Edición 1 (January 1961)

Detalles de la revista
Formato
Revista
eISSN
2719-9509
Publicado por primera vez
01 Jan 1992
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

Volumen 3 (1966): Edición 6 (September 1966)

Detalles de la revista
Formato
Revista
eISSN
2719-9509
Publicado por primera vez
01 Jan 1992
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

7 Artículos
Acceso abierto

Gas Chromatographic Analyses of Cigarette Smoke. Part 4: Mass Spectrometric Analyses / Zur Gaschromatographie des Cigarettenrauches. 4. Teil: ldentifikationen mit Hilfe des Massenspektrometers

Publicado en línea: 13 Jun 2014
Páginas: 403 - 408

Resumen

Abstract

In a recent investigation of the direct combination of open tubular gas chromatographic columns with a mass spectrometer the efficiency of the combined apparatus has been tested by analysing the vapour phase of cigarette smoke. The present paper deals with the problems and results of specific interest for smoke analysts that are not treated in the foregoing publication

Acceso abierto

Chemical Studies on Tobacco Smoke: I. The Quantitative Determination of Indoles in Cigarette Smoke

Publicado en línea: 13 Jun 2014
Páginas: 409 - 414

Resumen

Abstract

A method for the quantitative determination of indole and alkylated indoles in cigarette smoke is described. The analysis consists of distributions between n-hexane / methanol-water (4:1); n-hexane / methanol-water (1:2); column chromatography on Florosil and gas chromatographic separation on 20 % Apiezon L at 155°C. Quantitative data are secured by use of C14-labelled indole as internal standard. In the smoke of an 85 mm blended United States cigarette without filter tip were determined 13.9 µg indole, 14.0 µg skatole, 4.2 µg 3-ethylindole, and 0.21 µg 3-n-propylindole. The presence of an admixture of dimethylindoles was tentatively established; their concentration was below 0.03 µg per cigarette

Acceso abierto

The Formation of Benzo[a]pyrene and Benzo[e]pyrene during the Heating of Tobacco in Correlation to Temperature and Flow Rate in Nitrogen and Air Atmospheres / Die Bildung von Benzo[a]pyren und Benzo[e]pyren beim Erhitzen von Tabak in Abhängigkeit von Temperatur und Strömungsgeschwindigkeit in Luft- und Stickstoffatmosphäre

Publicado en línea: 13 Jun 2014
Páginas: 415 - 421

Resumen

Abstract

The authors investigated the dependence upon temperature of the formation of benzo[a]pyrene and benzo[e]pyrene from tobacco pyrolyzed in a thermostatic oven in atmospheres of nitrogen or air. The heating of tobacco to temperatures between 400° and 1000°C was found to result in a marked increase of the benzopyrene yield in the volatile parts. In this temperature range the quantity of benzo[a]pyrene formed from 100 g of tobacco augments from 4.4 µg to 18 350.0 µg (N2). At comparable temperatures measured in the combustion material by a thermocouple, the amounts of benzopyrenes formed respectively in nitrogen and air atmospheres were almost identical. With the introduction of air into the system the combustion enthalpy causes, under the same experimental conditions, a heating of the tobacco and, therefore, an increase in temperature which is considerably raised above that of the thermostatic oven. The formation of benzopyrenes was found to depend very much upon the flow rate. Moisture content, packing density and other geometrical factors have also a strong effect on the amount of polycyclic hydrocarbons formed during combustion. The quantities of benzopyrenes produced under equal experimental conditions by pyrolysis of other organic materials such as glucose and paraffin wax have been found to vary markedly (1:100 proportion). The yields of benzopyrenes produced by pyrolysis of tobacco (preheated combustion material) with the introduction of air into the system do exceed considerably the corresponding amounts obtained by the smoking of cigarettes

Acceso abierto

Composition Studies on Tobacco. XXlll: Pyrolytic and Structural Investigations on the Polyphenol-amino Acid Pigments of Leaf

Publicado en línea: 13 Jun 2014
Páginas: 422 - 429

Resumen

Abstract

The complex polyphenolic pigments of Turkish tobacco have been pyrolyzed to determine their possible contribution to the formation of aromatic compounds, especially polynuclear aromatic hydrocarbons (PAH), of smoke. The dark brown pigments were initially obtained by a basic aqueous extraction of tobacco. Various hydrolytic procedures showed the presence of rutin, chlorogenic acid, and a series of amino acids; some information on the structure of these pigments is presented. The pyrolysis of the pigments was carried out at 850°C and the products were fractionated to reveal the presence of more than a dozen PAH. Addition of pigments to cigarettes gave an increase in the level of benzo[a]pyrene in the smoke. The possible role of the polyphenolic pigments as a source of PAH in smoke is discussed

Acceso abierto

The Direct Preparation of Cigarette Smoke Condensate by High Velocity Impaction

Publicado en línea: 13 Jun 2014
Páginas: 430 - 437

Resumen

Abstract

A method is described for the collection of smoke condensate by high-velocity impaction. Analytical and mass-condensate versions are considered, and the results of analyses on their product are reported and discussed. The potential scope of applications of this type of collector are also indicated

Acceso abierto

Inhalation Experiments with Cigarette Smoke / Inhalationsexperimente mit Cigarettenrauch

Publicado en línea: 13 Jun 2014
Páginas: 438 - 448

Resumen

Abstract

The experimental results of the present paper and the knowledge gained by former inhalation experiments reveal that only those experimental procedures are suitable that make animals inhale high concentrations of smoke during a long period of time. The present results let appear how inhalation experiments are most favourably arranged. It has to be guaranteed that the animals are not endangered and that considerable quantities of smoke are inhaled. The distance between cigarette and animal should be as small as possible. Intervallic smoking seems to be advisable. The well-developed filtration capacity of the upper respiratory tract of animals usually breathing through their nose does not exclude the possibility of making fruitful inhalation experiments with rodents. The value of such experiments does decisively depend on the animal species

Acceso abierto

A Method for the Determination of Nicotine in Lung Tissue of Hamsters / Eine Methode zur Bestimmung des Nikotins in Hamsterlungen

Publicado en línea: 13 Jun 2014
Páginas: 449 - 453

Resumen

Abstract

A method for the determination of nicotine in lung tissue is presented. The nicotine is extracted from homogenized lung tissue by means of a mixture of hydrochloric acid and methanol. It is then spectrophotometrically determined after the disturbing accompanying substances have been eliminated by a preliminary acid steam distillation. The method's inferior limit of detection is 40 µg of nicotine contained in 3 lungs, which corresponds to 17.7 µg of nicotine per gramme of lung tissue. In the case of nicotine contents of 50 µg per analytical procedure the standard deviation of the method was found to be 1.7 µg, and the resulting coefficient of variation was calculated to be 3.4 %. The procedure is simple and therefore suitable for the study of numerous samples. The exposure of hamsters to inhaled raw cigarette smoke revealed that the nicotine content of lungs of experimental animals augments with the number of burnt cigarettes and the duration of inhalation. The reproducibility of Dontenwill's inhalation procedure was tested and proved to be satisfactory. The coefficient of variation within two series of inhalation experiments was found to be between 4.1 and 5.2 %

7 Artículos
Acceso abierto

Gas Chromatographic Analyses of Cigarette Smoke. Part 4: Mass Spectrometric Analyses / Zur Gaschromatographie des Cigarettenrauches. 4. Teil: ldentifikationen mit Hilfe des Massenspektrometers

Publicado en línea: 13 Jun 2014
Páginas: 403 - 408

Resumen

Abstract

In a recent investigation of the direct combination of open tubular gas chromatographic columns with a mass spectrometer the efficiency of the combined apparatus has been tested by analysing the vapour phase of cigarette smoke. The present paper deals with the problems and results of specific interest for smoke analysts that are not treated in the foregoing publication

Acceso abierto

Chemical Studies on Tobacco Smoke: I. The Quantitative Determination of Indoles in Cigarette Smoke

Publicado en línea: 13 Jun 2014
Páginas: 409 - 414

Resumen

Abstract

A method for the quantitative determination of indole and alkylated indoles in cigarette smoke is described. The analysis consists of distributions between n-hexane / methanol-water (4:1); n-hexane / methanol-water (1:2); column chromatography on Florosil and gas chromatographic separation on 20 % Apiezon L at 155°C. Quantitative data are secured by use of C14-labelled indole as internal standard. In the smoke of an 85 mm blended United States cigarette without filter tip were determined 13.9 µg indole, 14.0 µg skatole, 4.2 µg 3-ethylindole, and 0.21 µg 3-n-propylindole. The presence of an admixture of dimethylindoles was tentatively established; their concentration was below 0.03 µg per cigarette

Acceso abierto

The Formation of Benzo[a]pyrene and Benzo[e]pyrene during the Heating of Tobacco in Correlation to Temperature and Flow Rate in Nitrogen and Air Atmospheres / Die Bildung von Benzo[a]pyren und Benzo[e]pyren beim Erhitzen von Tabak in Abhängigkeit von Temperatur und Strömungsgeschwindigkeit in Luft- und Stickstoffatmosphäre

Publicado en línea: 13 Jun 2014
Páginas: 415 - 421

Resumen

Abstract

The authors investigated the dependence upon temperature of the formation of benzo[a]pyrene and benzo[e]pyrene from tobacco pyrolyzed in a thermostatic oven in atmospheres of nitrogen or air. The heating of tobacco to temperatures between 400° and 1000°C was found to result in a marked increase of the benzopyrene yield in the volatile parts. In this temperature range the quantity of benzo[a]pyrene formed from 100 g of tobacco augments from 4.4 µg to 18 350.0 µg (N2). At comparable temperatures measured in the combustion material by a thermocouple, the amounts of benzopyrenes formed respectively in nitrogen and air atmospheres were almost identical. With the introduction of air into the system the combustion enthalpy causes, under the same experimental conditions, a heating of the tobacco and, therefore, an increase in temperature which is considerably raised above that of the thermostatic oven. The formation of benzopyrenes was found to depend very much upon the flow rate. Moisture content, packing density and other geometrical factors have also a strong effect on the amount of polycyclic hydrocarbons formed during combustion. The quantities of benzopyrenes produced under equal experimental conditions by pyrolysis of other organic materials such as glucose and paraffin wax have been found to vary markedly (1:100 proportion). The yields of benzopyrenes produced by pyrolysis of tobacco (preheated combustion material) with the introduction of air into the system do exceed considerably the corresponding amounts obtained by the smoking of cigarettes

Acceso abierto

Composition Studies on Tobacco. XXlll: Pyrolytic and Structural Investigations on the Polyphenol-amino Acid Pigments of Leaf

Publicado en línea: 13 Jun 2014
Páginas: 422 - 429

Resumen

Abstract

The complex polyphenolic pigments of Turkish tobacco have been pyrolyzed to determine their possible contribution to the formation of aromatic compounds, especially polynuclear aromatic hydrocarbons (PAH), of smoke. The dark brown pigments were initially obtained by a basic aqueous extraction of tobacco. Various hydrolytic procedures showed the presence of rutin, chlorogenic acid, and a series of amino acids; some information on the structure of these pigments is presented. The pyrolysis of the pigments was carried out at 850°C and the products were fractionated to reveal the presence of more than a dozen PAH. Addition of pigments to cigarettes gave an increase in the level of benzo[a]pyrene in the smoke. The possible role of the polyphenolic pigments as a source of PAH in smoke is discussed

Acceso abierto

The Direct Preparation of Cigarette Smoke Condensate by High Velocity Impaction

Publicado en línea: 13 Jun 2014
Páginas: 430 - 437

Resumen

Abstract

A method is described for the collection of smoke condensate by high-velocity impaction. Analytical and mass-condensate versions are considered, and the results of analyses on their product are reported and discussed. The potential scope of applications of this type of collector are also indicated

Acceso abierto

Inhalation Experiments with Cigarette Smoke / Inhalationsexperimente mit Cigarettenrauch

Publicado en línea: 13 Jun 2014
Páginas: 438 - 448

Resumen

Abstract

The experimental results of the present paper and the knowledge gained by former inhalation experiments reveal that only those experimental procedures are suitable that make animals inhale high concentrations of smoke during a long period of time. The present results let appear how inhalation experiments are most favourably arranged. It has to be guaranteed that the animals are not endangered and that considerable quantities of smoke are inhaled. The distance between cigarette and animal should be as small as possible. Intervallic smoking seems to be advisable. The well-developed filtration capacity of the upper respiratory tract of animals usually breathing through their nose does not exclude the possibility of making fruitful inhalation experiments with rodents. The value of such experiments does decisively depend on the animal species

Acceso abierto

A Method for the Determination of Nicotine in Lung Tissue of Hamsters / Eine Methode zur Bestimmung des Nikotins in Hamsterlungen

Publicado en línea: 13 Jun 2014
Páginas: 449 - 453

Resumen

Abstract

A method for the determination of nicotine in lung tissue is presented. The nicotine is extracted from homogenized lung tissue by means of a mixture of hydrochloric acid and methanol. It is then spectrophotometrically determined after the disturbing accompanying substances have been eliminated by a preliminary acid steam distillation. The method's inferior limit of detection is 40 µg of nicotine contained in 3 lungs, which corresponds to 17.7 µg of nicotine per gramme of lung tissue. In the case of nicotine contents of 50 µg per analytical procedure the standard deviation of the method was found to be 1.7 µg, and the resulting coefficient of variation was calculated to be 3.4 %. The procedure is simple and therefore suitable for the study of numerous samples. The exposure of hamsters to inhaled raw cigarette smoke revealed that the nicotine content of lungs of experimental animals augments with the number of burnt cigarettes and the duration of inhalation. The reproducibility of Dontenwill's inhalation procedure was tested and proved to be satisfactory. The coefficient of variation within two series of inhalation experiments was found to be between 4.1 and 5.2 %

Planifique su conferencia remota con Sciendo