Analytical Studies on Harvested Tobacco Leaves

Frankenburg, W. G.; Gottscho, A. M.; Kissinger, Suzanne; Bender, Doris; Ehrlich, Margaret

doi:10.1021/ac60084a002

Cited by 12 publications

(7 citation statements)

References 46 publications

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“…The water-soluble fraction of the nitrogenous leaf compounds consists mainly of nicotine, free ammonia, amides of glutamic acid and aspartic acid, nitrates, nornicotine, oxynicotine, alpha amino acids, nicotinic acid, and many unidentified compounds (Frankenburg et al, 1953). Translocation of soluble nitrogenous compounds from lower leaves to actively growing upper leaves of the tobacco plant was reported by Noguchi et al (1964).…”

Section: Literature Reviewmentioning

confidence: 97%

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹

Brown¹,

Terrill²

1973

Agronomy Journal

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Tobacco (Nicotiana tabacum L.) is subject to modification of chemical characteristics by alteration of production practices. If a suitable product can be provided for the tobacco manufacturers, utilizing the once‐over harvest approach, a much simpler and relatively less expensive harvesting machine could be developed and production costs could be markedly reduced. Normal and once‐over methods of harvesting flue‐cured tobacco were evaluated for effects on the chemical characteristics of cured leaves. All plants were topped to 12, 16, or 20 leaves per plant. Stalk position data were compared within the three topping heights. Lesser percentages of total N and total N‐soluble and a lower pH were evident in leaves grown in 1968 than those produced in 1969. As topping height was increased from 12 to 20 leaves per plant, percentages of total N, total N‐soluble, nicotine, and water‐soluble acids in the leaves decreased, while reducing sugars increased. These chemical changes were attributed to utilization of equivalent amounts of nitrogen for the development of greater number of leaves. Higher concentrations of total N, total N‐soluble, nicotine, and water‐soluble acids were recorded for leaves harvested by the normal method than when all leaves were removed in one harvest. Undoubtedly, overmature bottom leaves and immature top leaves, associated with the once‐over method, influenced the average chemical composition for the whole plant. The nitrogenous constituents and water soluble acids increasel in leaves from bottom to top stalk positions except for percent alpha amino nitrogen. The pH of leaves decreased from bottom to top stalk positions. Overmature bottom and immature top leaves from the once‐over harvest contributed to difference in chemical composition of leaves at the upper and the lower stalk positions. When all leaves were harvested at one time, only bottom and top leaves appeared to be different in chemical composition from those presently being used by the tobacco trades.

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Section: Literature Reviewmentioning

confidence: 97%

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹

Brown¹,

Terrill²

1973

Agronomy Journal

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“…(10) Darkis, F. R., Pederson, P. M., and Gross, P. M., Ibid., 33, 1549 (1941). (11) Dittmar, H., Pharm. Zentralhalle, 81, 169 (1940).…”

Section: And Engineeringmentioning

confidence: 99%

Nitrogen Compounds in Fermented Cigar Leaves

Frankenburg¹,

Gottscho²

1952

Ind. Eng. Chem.

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“…Glutamine can interfere positively in the distillation of ammonia through hydrolysis to form ammonia especially as the basicity of the solution, temperature and length of heating are increased. Nicotine interferes in the colorimetric phenate-hypochlorite reaction, as reported by Frankenburg (2). Thus, in this system the tobacco extract, buffered at pH 9, is passed rapidly through a short tube immersed in the 95° C heating bath to minimize both the hydrolysis of amides such as glutamine and the volatilization of nicotine.…”

Section: Resultsmentioning

confidence: 96%

An Automated Procedure for the Determination of Ammonia in Tobacco

Collins¹,

Lawrence²,

Williams³

1972

Beiträge Zur Tabakforschung / Contributions to Tobacco Research

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A procedure for the automated determination of ammonia in tobacco has been developed. Ammonia is extracted from the ground tobacco sample with water and is determined with a Technicon Auto Analyser system which employs separation of the ammonia through volatilization followed by colourimetry using the phenate-hypochlorite reaction. The procedure has been applied to a variety of tobaccos containing from 0.02 to 0.5 % ammonia with an overall relative standard deviation of 2 %. The accuracy of the procedure as judged by recovery tests and by comparison to a manual distillation method is considered adequate

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Analytical Studies on Harvested Tobacco Leaves

Cited by 12 publications

References 46 publications

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹

Nitrogen Compounds in Fermented Cigar Leaves

An Automated Procedure for the Determination of Ammonia in Tobacco

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Analytical Studies on Harvested Tobacco Leaves

Cited by 12 publications

References 46 publications

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components1

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components1

Nitrogen Compounds in Fermented Cigar Leaves

An Automated Procedure for the Determination of Ammonia in Tobacco

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Product

Resources

About

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹

Effects of Method of Harvest on Flue‐Cured Tobacco Part II. Chemical Components¹