Factors influencing TSNAs in Indian tobacco
Monitoring and reduction of Tobacco Specific Nitrosamines (TSNAs), has attracted the attention of scientists all over the world, in view of their role in the cause of cancer. Accordingly, analysis of TSNAs in FCV and burley tobacco cultivated in different agro-ecological situations in India was undertaken by using the isothermal capillary GC-TEA method developed at this Institute. Results showed that FCV tobacco variety, K-326 (NLS-4) cultivated under irrigated conditions in the sands and sandy loams (Alfisols) of Northern Light Soils (NLS) had higher levels of TSNAs when compared to other cultivars. However, TSNAs were not in detectable levels in the varieties cultivated under monsoonic conditions in the sandy loams (Alfisols) of Karnataka Light Soils (KLS). Banket A1, the burley cultivar grown in the sandy loams (Alfisols) of Yeleswaram tract in Andhra Pradesh had lower levels of TSNAs when compared to Burley 21. It is inferred from the analysis that type of soil, climatic conditions, genotype/variety and agro-techniques had a profound influence on the levels of TSNAs. It is observed that the levels of TSNAs in Indian FCV and burley tobacco are lower when compared to the data reported for foreign tobaccos. The effect of nitrogen fertilization, especially, proportion of organic/inorganic sources of N on the levels of TSNAs is also discussed.