SVIBOR - Project code: 4-01-173


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 4-01-173


Main researcher: BELJO, JURE (192345)

Type of research: applied
Duration from: 03/01/93. to 02/15/98.

Papers on project (total): 0
Institution name: Duhanski institut, Zagreb (92)
Phone: 385 (0)1/228-222; 228-225
Fax: 385 (0)1/2332-850

Summary: Reducing the harmful components of tobacco and tobacco smoke is one of the major tasks in research on tobacco for smoking. The aim of this project is to investigate how chemical components considered harmful occur and how they can be reduced, both in tobacco and in tobacco smoke. Research on the project included agronomic field experiments as well as analytical investigations in the laboratory. It was determined that the nicotine content, which is the major chemical component of tobacco, depends to a great extent on the equilibrium moisture content in the soil. Therefore the nicotine content of tobacco can be changed by changing the weater - air regimen in the soil. The genetic basis for the nitrogen and nitrates content in tobacco was analyzed. Nitrogen and nitrates are the precursors of some harmful substances. It was found that there are cultivars with a genetic predisposition for a high content of these components, but their content can be changed using appropriate agro-technical measures. The degree of correlation between the visual quality of tobacco and its chemical composition was also investigated. An analysis of the smoking properties of tobacco showed that the aeration of cigarettes has a considerable impact on the content of harmful substances in the smoke. An agro-technical experiment involving different cultivars is under way to establish the contribution of the genetic basis and of agro-technical measures to the chemical and smoking properties of tobacco and the possibilities of their modification. The development of new germplasm with hereditary lower contents of some chemical components was started by developing hybrids of previously defined cultivars. A selection procedure is under way which will lead to the selection of appropriate genotypes.

Keywords: tobacco flue-cured, burley, hramful substances, nicotine, smoke condensate, tar, breeding, variety, cultural practice, tobacco shemistry, cigarette, cigarette chemistry

Research goals: The aim of the research in this project is to obtain a finalproduct with a reduced content of hramful components, such as tarand nicotine, without affecting the smoking quality. Work on theproject is complex, and the final result depends on thesuccessful completion of a number of mutually interconnectedbiological and technological operations. The realization of theproject implies the following: - obtaining cultivars which are, due to their genetic make up,predisposed to a lower content of alkaloids and condensate as themajor source of harmful components of tobacco and tobacco smoke; - determining the optimum growing procedures (fertilization,plant density, irrigation, topping) which contribute to reducingthe harmful components of tobacco; - determining the optimum relationship between cigaretteventilation the content of the more important chemicalsubstances, and physiological satisfaction in smoking. The results obtained will enhance the competitiveness of tobaccoand tobacco products on the domestic and export markets.

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Last update: 10/09/95