Effect of maleic hydrazide application on accumulation of tobacco-specific nitrosamines in air-cured burley tobacco
1994
Cui, M. | Bruton, H.R. | Bush, L.P. | Sutton, T.G. | Crafts-Brandner, S.J.
A two year study was initiated to determine the effect of maleic hydrazide application rates (0.5x, 1.0x, 1.5x, and 2.0x the recommended rate) and methods (single, split, and reduced volume application) on accumulation of tobacco-specific nitrosamines (TSNA) and the correlation between TSNA and their precursors in burley tobacco. With increased MH application rates, alkaloids and nitrate levels decreased, whereas nitrite level was not affected. TSNAs were significantly lower (30-50%) in the lamina from the top stalk position than the hand-suckered control. N'-Nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), N'-nitrosoanabasine (NAB), and N'-nitrosoanatabine (NAT) were lowered by 15-51%, 36-65%, 38-61%, and 30-58%, respectively, at the top stalk position. TSNA content was significantly correlated with the content of alkaloid in the lamina. These results suggest that MH application may alter precursors-TSNA relationship which results in decreases of TSNA in air-cured burley tobacco.
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