Magazine et Edition

Volume 31 (2022): Edition 2 (July 2022)

Volume 31 (2022): Edition 1 (March 2022)

Volume 30 (2021): Edition 4 (November 2021)

Volume 30 (2021): Edition 3 (July 2021)

Volume 30 (2021): Edition 2 (May 2021)

Volume 30 (2021): Edition 1 (March 2021)

Volume 29 (2020): Edition 3 (December 2020)

Volume 29 (2020): Edition 2 (August 2020)

Volume 29 (2020): Edition 1 (April 2020)

Volume 28 (2019): Edition 7 (December 2019)

Volume 28 (2019): Edition 6 (August 2019)

Volume 28 (2019): Edition 5 (May 2019)

Volume 28 (2018): Edition 4 (December 2018)

Volume 28 (2018): Edition 3 (October 2018)

Volume 28 (2018): Edition 2 (August 2018)

Volume 28 (2018): Edition 1 (April 2018)

Volume 27 (2017): Edition 8 (December 2017)

Volume 27 (2017): Edition 7 (September 2017)

Volume 27 (2017): Edition 6 (April 2017)

Volume 27 (2017): Edition 5 (January 2017)

Volume 27 (2016): Edition 4 (October 2016)

Volume 27 (2016): Edition 3 (July 2016)

Volume 27 (2016): Edition 2 (April 2016)

Volume 27 (2016): Edition 1 (January 2016)

Volume 26 (2015): Edition 7 (September 2015)

Volume 26 (2015): Edition 6 (June 2015)

Volume 26 (2015): Edition 5 (March 2015)

Volume 26 (2014): Edition 4 (December 2014)

Volume 26 (2014): Edition 3 (September 2014)

Volume 26 (2014): Edition 2 (July 2014)

Volume 26 (2014): Edition 1 (April 2014)

Volume 25 (2013): Edition 8 (December 2013)

Volume 25 (2013): Edition 7 (September 2013)

Volume 25 (2013): Edition 6 (June 2013)

Volume 25 (2013): Edition 5 (March 2013)

Volume 25 (2012): Edition 4 (December 2012)

Volume 25 (2012): Edition 3 (August 2012)

Volume 25 (2012): Edition 2 (June 2012)

Volume 25 (2012): Edition 1 (February 2012)

Volume 24 (2011): Edition 6 (November 2011)

Volume 24 (2011): Edition 5 (May 2011)

Volume 24 (2011): Edition 4 (January 2011)

Volume 24 (2010): Edition 3 (November 2010)

Volume 24 (2010): Edition 2 (July 2010)

Volume 24 (2010): Edition 1 (April 2010)

Volume 23 (2009): Edition 6 (December 2009)

Volume 23 (2009): Edition 5 (September 2009)

Volume 23 (2009): Edition 4 (May 2009)

Volume 23 (2008): Edition 3 (December 2008)

Volume 23 (2008): Edition 2 (August 2008)

Volume 23 (2008): Edition 1 (April 2008)

Volume 22 (2007): Edition 5 (June 2007)

Volume 22 (2007): Edition 4 (January 2007)

Volume 22 (2006): Edition 3 (October 2006)

Volume 22 (2006): Edition 2 (July 2006)

Volume 22 (2006): Edition 1 (April 2006)

Volume 21 (2005): Edition 8 (December 2005)

Volume 21 (2005): Edition 7 (October 2005)

Volume 21 (2005): Edition 6 (July 2005)

Volume 21 (2005): Edition 5 (April 2005)

Volume 21 (2004): Edition 4 (December 2004)

Volume 21 (2004): Edition 3 (October 2004)

Volume 21 (2004): Edition 2 (July 2004)

Volume 21 (2004): Edition 1 (March 2004)

Volume 20 (2003): Edition 8 (December 2003)

Volume 20 (2003): Edition 7 (November 2003)

Volume 20 (2003): Edition 6 (July 2003)

Volume 20 (2003): Edition 5 (March 2003)

Volume 20 (2002): Edition 4 (December 2002)

Volume 20 (2002): Edition 3 (August 2002)

Volume 20 (2002): Edition 2 (June 2002)

Volume 20 (2002): Edition 1 (February 2002)

Volume 19 (2001): Edition 7 (October 2001)

Volume 19 (2001): Edition 6 (July 2001)

Volume 19 (2001): Edition 5 (April 2001)

Volume 19 (2001): Edition 4 (January 2001)

Volume 19 (2000): Edition 3 (October 2000)

Volume 19 (2000): Edition 2 (July 2000)

Volume 19 (2000): Edition 1 (April 2000)

Volume 18 (1999): Edition 6 (December 1999)

Volume 18 (1999): Edition 5 (July 1999)

Volume 18 (1999): Edition 4 (April 1999)

Volume 18 (1998): Edition 3 (December 1998)

Volume 18 (1998): Edition 2 (August 1998)

Volume 18 (1998): Edition 1 (April 1998)

Volume 17 (1997): Edition 3 (December 1997)

Volume 17 (1997): Edition 2 (September 1997)

Volume 17 (1996): Edition 1 (December 1996)

Volume 16 (1995): Edition 4 (November 1995)

Volume 16 (1995): Edition 3 (July 1995)

Volume 16 (1994): Edition 2 (June 1994)

Volume 16 (1994): Edition 1 (May 1994)

Volume 15 (1992): Edition 3 (November 1992)

Volume 15 (1992): Edition 2 (April 1992)

Volume 15 (1991): Edition 1 (August 1991)

Volume 14 (1990): Edition 6 (June 1990)

Volume 14 (1989): Edition 5 (October 1989)

Volume 14 (1989): Edition 4 (February 1989)

Volume 14 (1989): Edition 3 (January 1989)

Volume 14 (1988): Edition 2 (October 1988)

Volume 14 (1987): Edition 1 (December 1987)

Volume 13 (1986): Edition 5 (December 1986)

Volume 13 (1986): Edition 4 (August 1986)

Volume 13 (1986): Edition 3 (July 1986)

Volume 13 (1985): Edition 2 (December 1985)

Volume 13 (1985): Edition 1 (January 1985)

Volume 12 (1984): Edition 5 (November 1984)

Volume 12 (1984): Edition 4 (July 1984)

Volume 12 (1984): Edition 3 (February 1984)

Volume 12 (1983): Edition 2 (June 1983)

Volume 12 (1983): Edition 1 (February 1983)

Volume 11 (1982): Edition 5 (November 1982)

Volume 11 (1982): Edition 4 (August 1982)

Volume 11 (1982): Edition 3 (January 1982)

Volume 11 (1981): Edition 2 (September 1981)

Volume 11 (1981): Edition 1 (March 1981)

Volume 10 (1980): Edition 3 (October 1980)

Volume 10 (1980): Edition 2 (July 1980)

Volume 10 (1979): Edition 1 (December 1979)

Volume 9 (1978): Edition 5 (December 1978)

Volume 9 (1978): Edition 4 (July 1978)

Volume 9 (1977): Edition 3 (October 1977)

Volume 9 (1977): Edition 2 (June 1977)

Volume 9 (1977): Edition 1 (April 1977)

Volume 8 (1976): Edition 7 (October 1976)

Volume 8 (1976): Edition 6 (June 1976)

Volume 8 (1976): Edition 5 (March 1976)

Volume 8 (1975): Edition 4 (December 1975)

Volume 8 (1975): Edition 3 (August 1975)

Volume 8 (1975): Edition 2 (May 1975)

Volume 8 (1975): Edition 1 (January 1975)

Volume 7 (1974): Edition 5 (September 1974)

Volume 7 (1974): Edition 4 (April 1974)

Volume 7 (1973): Edition 3 (November 1973)

Volume 7 (1973): Edition 2 (June 1973)

Volume 7 (1973): Edition 1 (January 1973)

Volume 6 (1972): Edition 5 (October 1972)

Volume 6 (1972): Edition 4 (August 1972)

Volume 6 (1972): Edition 3 (March 1972)

Volume 6 (1971): Edition 2 (September 1971)

Volume 6 (1971): Edition 1 (July 1971)

Volume 5 (1970): Edition 6 (December 1970)

Volume 5 (1970): Edition 5 (November 1970)

Volume 5 (1970): Edition 4 (August 1970)

Volume 5 (1969): Edition 3 (December 1969)

Volume 5 (1969): Edition 2 (August 1969)

Volume 5 (1969): Edition 1 (June 1969)

Volume 4 (1968): Edition 7 (December 1968)

Volume 4 (1968): Edition 6 (November 1968)

Volume 4 (1968): Edition 5 (July 1968)

Volume 4 (1968): Edition 4 (May 1968)

Volume 4 (1968): Edition 3 (February 1968)

Volume 4 (1967): Edition 2 (October 1967)

Volume 4 (1967): Edition 1 (August 1967)

Volume 3 (1966): Edition 9 (December 1966)

Volume 3 (1966): Edition 8 (December 1966)

Volume 3 (1966): Edition 7 (November 1966)

Volume 3 (1966): Edition 6 (September 1966)

Volume 3 (1966): Edition 5 (May 1966)

Volume 3 (1965): Edition 4 (October 1965)

Volume 3 (1965): Edition 3 (August 1965)

Volume 3 (1965): Edition 2 (May 1965)

Volume 3 (1965): Edition 1 (April 1965)

Volume 2 (1964): Edition 7 (November 1964)

Volume 2 (1964): Edition 6 (October 1964)

Volume 2 (1964): Edition 5 (May 1964)

Volume 2 (1964): Edition 4 (February 1964)

Volume 2 (1963): Edition 3 (October 1963)

Volume 2 (1963): Edition 2 (June 1963)

Volume 2 (1963): Edition 1 (March 1963)

Volume 1 (1962): Edition 10 (December 1962)

Volume 1 (1962): Edition 9 (December 1962)

Volume 1 (1962): Edition 8 (November 1962)

Volume 1 (1962): Edition 7 (November 1962)

Volume 1 (1962): Edition 6 (July 1962)

Volume 1 (1962): Edition 5 (February 1962)

Volume 1 (1961): Edition 4 (November 1961)

Volume 1 (1961): Edition 3 (August 1961)

Volume 1 (1961): Edition 2 (May 1961)

Volume 1 (1961): Edition 1 (January 1961)

Détails du magazine
Format
Magazine
eISSN
2719-9509
Première publication
01 Jan 1992
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 21 (2005): Edition 7 (October 2005)

Détails du magazine
Format
Magazine
eISSN
2719-9509
Première publication
01 Jan 1992
Période de publication
4 fois par an
Langues
Anglais

Chercher

6 Articles
Accès libre

Analysis of Minor Alkaloids in Tobacco: A Collaborative Study

Publié en ligne: 30 Dec 2014
Pages: 369 - 379

Résumé

Abstract

A collaborative study regarding the analysis of minor alkaloids in tobacco and tobacco products was initiated by the Analytical Methods Committee of the Tobacco Science Research Conference (TSRC). One purpose of the study was to assess the reliability of methods used for the analysis of minor alkaloids and nicotine in tobacco and tobacco products, as practiced in different laboratories. A second purpose was to select a preferred method or to develop a hybrid method based on the best elements from the procedures currently used for the analysis of minor alkaloids. A hybrid method was developed and its results compared with the values from existing methods. The hybrid method proves to be reliable, has good repeatability, and is easy to implement. This new method can be used as a reference procedure for minor alkaloids and nicotine analysis using either flame ionization (FID) or mass spectrometric (MS) detection. A comparison with the older techniques shows that the hybrid method considerably improved the repeatability, but only marginally increased the reproducibility for different laboratories. This may be, in part, because any new method requires some time to become fully standardized and reliable. Also, the contribution of other sources of variation such as different standards and different equipment may have limited the improvement in reproducibility.

Accès libre

Separation and Identification of Sucrose Esters from Turkish Tobacco Using Liquid Chromatography-Mass Spectrometry

Publié en ligne: 30 Dec 2014
Pages: 381 - 389

Résumé

Abstract

Tetra-acylated sucrose esters (SE) in Turkish tobacco extracts have been separated and identified using liquid chromatography-mass spectrometry (LC-MS). An enriched fraction of SE from semi-preparative normal phase liquid chromatography of the methylene chloride extract was chosen for characterization. Several types of SE were observed that differed primarily in placement of the acyl functionality on either the glucose or the fructose fragment. In addition to acetyl, the other three observed acyl substitution patterns were governed by the presence of butyl, pentyl, and hexyl alkyl substituents. Within each type of SE, there were observed several homologs differing by a methylene moiety. Within each homolog, a number of isomeric components were found. The presence of unsaturation in one of the acyl alkyl substituents gave rise to another homologous series wherein isomers of the same mass were discovered. The information on the substitution pattern of SE using this new LC-MS approach was very similar to that obtained previously on tobacco samples employing gas chromatography-mass spectrometry (GC-MS) of derivatized sucrose esters.

Accès libre

A Low-Cost System for Measuring ppb-Level NO2

Publié en ligne: 30 Dec 2014
Pages: 390 - 401

Résumé

Abstract

A low-cost system to measure low-level nitrogen dioxide (NO2) in an atmosphere was developed. Its major component included a sensor comprising filter paper treated with 3,3’-dimethylbenzidine (o-tolidine), a compound that reacts with NO2to generate color proportional to the NO2contacted. In addition to the system development, its utility was optimized and the characteristics of the sensor were defined. Originally developed to determine the NO2levels during direct-fired tobacco curing, the system may be used to determine the NO2levels in other situations.

Accès libre

Numerical Simulation of a Cigarette during Smoking

Publié en ligne: 30 Dec 2014
Pages: 403 - 416

Résumé

Abstract

A mathematical model for a lit cigarette is derived, which predicts pressure, flow velocity, temperature and gas concentrations inside and outside the cigarette. It consists of a continuum-mechanical model for the flow and a discrete model for the chemical reactions occurring in the tobacco particles.

The cigarette model is simulated for a cigarette in a vertical position by methods known as computational fluid dynamics (CFD). Calculated temperature and gas concentration profiles are compared to measured data from the literature for smouldering, puffing and steady-draw. For thermo-physical properties, such as temperature fields and burn rates, a good correspondence with experimental data was found. The correspondence with measured gas concentration profiles was also acceptable, even though the reaction model is rather simple. The results show the importance of including the surroundings of the cigarette in the computational domain.

Secondly, a cigarette in a horizontal position is simulated both for free smouldering and for smouldering on a substrate, as occurs, for example, during the ignition strength test. The results show certain qualitative differences between the two smouldering regimes in the flow pattern outside the cigarette and in the transfer of heat to the surroundings and to the substrate.

The proposed model offers two main advantages. Firstly, it does not need the input of any data, that can only be measured if the cigarette has been lit, such as temperature fields or burn rates. Secondly, with this model all types of smoking regimes such as smouldering, puffing and steady-draw can be simulated without making any modifications to the mathematical model or its parameters. Only the boundary conditions need to be adapted.

Accès libre

Commentary: DIN Technical Report 133 - Toxicological Evaluation of Additives for Tobacco Products - A Guide

Publié en ligne: 30 Dec 2014
Pages: 417 - 418

Résumé

Accès libre

Conference Report: Experimental Assessment of the Toxicological Effects of Inhaled Complex Mixtures on the Respiratory System - Feasability and Limitations, 23-25 April 2005, Barcelona, Spain

Publié en ligne: 30 Dec 2014
Pages: 419 - 422

Résumé

6 Articles
Accès libre

Analysis of Minor Alkaloids in Tobacco: A Collaborative Study

Publié en ligne: 30 Dec 2014
Pages: 369 - 379

Résumé

Abstract

A collaborative study regarding the analysis of minor alkaloids in tobacco and tobacco products was initiated by the Analytical Methods Committee of the Tobacco Science Research Conference (TSRC). One purpose of the study was to assess the reliability of methods used for the analysis of minor alkaloids and nicotine in tobacco and tobacco products, as practiced in different laboratories. A second purpose was to select a preferred method or to develop a hybrid method based on the best elements from the procedures currently used for the analysis of minor alkaloids. A hybrid method was developed and its results compared with the values from existing methods. The hybrid method proves to be reliable, has good repeatability, and is easy to implement. This new method can be used as a reference procedure for minor alkaloids and nicotine analysis using either flame ionization (FID) or mass spectrometric (MS) detection. A comparison with the older techniques shows that the hybrid method considerably improved the repeatability, but only marginally increased the reproducibility for different laboratories. This may be, in part, because any new method requires some time to become fully standardized and reliable. Also, the contribution of other sources of variation such as different standards and different equipment may have limited the improvement in reproducibility.

Accès libre

Separation and Identification of Sucrose Esters from Turkish Tobacco Using Liquid Chromatography-Mass Spectrometry

Publié en ligne: 30 Dec 2014
Pages: 381 - 389

Résumé

Abstract

Tetra-acylated sucrose esters (SE) in Turkish tobacco extracts have been separated and identified using liquid chromatography-mass spectrometry (LC-MS). An enriched fraction of SE from semi-preparative normal phase liquid chromatography of the methylene chloride extract was chosen for characterization. Several types of SE were observed that differed primarily in placement of the acyl functionality on either the glucose or the fructose fragment. In addition to acetyl, the other three observed acyl substitution patterns were governed by the presence of butyl, pentyl, and hexyl alkyl substituents. Within each type of SE, there were observed several homologs differing by a methylene moiety. Within each homolog, a number of isomeric components were found. The presence of unsaturation in one of the acyl alkyl substituents gave rise to another homologous series wherein isomers of the same mass were discovered. The information on the substitution pattern of SE using this new LC-MS approach was very similar to that obtained previously on tobacco samples employing gas chromatography-mass spectrometry (GC-MS) of derivatized sucrose esters.

Accès libre

A Low-Cost System for Measuring ppb-Level NO2

Publié en ligne: 30 Dec 2014
Pages: 390 - 401

Résumé

Abstract

A low-cost system to measure low-level nitrogen dioxide (NO2) in an atmosphere was developed. Its major component included a sensor comprising filter paper treated with 3,3’-dimethylbenzidine (o-tolidine), a compound that reacts with NO2to generate color proportional to the NO2contacted. In addition to the system development, its utility was optimized and the characteristics of the sensor were defined. Originally developed to determine the NO2levels during direct-fired tobacco curing, the system may be used to determine the NO2levels in other situations.

Accès libre

Numerical Simulation of a Cigarette during Smoking

Publié en ligne: 30 Dec 2014
Pages: 403 - 416

Résumé

Abstract

A mathematical model for a lit cigarette is derived, which predicts pressure, flow velocity, temperature and gas concentrations inside and outside the cigarette. It consists of a continuum-mechanical model for the flow and a discrete model for the chemical reactions occurring in the tobacco particles.

The cigarette model is simulated for a cigarette in a vertical position by methods known as computational fluid dynamics (CFD). Calculated temperature and gas concentration profiles are compared to measured data from the literature for smouldering, puffing and steady-draw. For thermo-physical properties, such as temperature fields and burn rates, a good correspondence with experimental data was found. The correspondence with measured gas concentration profiles was also acceptable, even though the reaction model is rather simple. The results show the importance of including the surroundings of the cigarette in the computational domain.

Secondly, a cigarette in a horizontal position is simulated both for free smouldering and for smouldering on a substrate, as occurs, for example, during the ignition strength test. The results show certain qualitative differences between the two smouldering regimes in the flow pattern outside the cigarette and in the transfer of heat to the surroundings and to the substrate.

The proposed model offers two main advantages. Firstly, it does not need the input of any data, that can only be measured if the cigarette has been lit, such as temperature fields or burn rates. Secondly, with this model all types of smoking regimes such as smouldering, puffing and steady-draw can be simulated without making any modifications to the mathematical model or its parameters. Only the boundary conditions need to be adapted.

Accès libre

Commentary: DIN Technical Report 133 - Toxicological Evaluation of Additives for Tobacco Products - A Guide

Publié en ligne: 30 Dec 2014
Pages: 417 - 418

Résumé

Accès libre

Conference Report: Experimental Assessment of the Toxicological Effects of Inhaled Complex Mixtures on the Respiratory System - Feasability and Limitations, 23-25 April 2005, Barcelona, Spain

Publié en ligne: 30 Dec 2014
Pages: 419 - 422

Résumé

Planifiez votre conférence à distance avec Sciendo