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Ye X.,Shenzhen Tobacco Industry Co. | Zou Y.,Shenzhen Tobacco Industry Co. | Yu Z.,South China Agricultural University | Chen Y.,Shenzhen Tobacco Industry Co. | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

The quantitative relationship between vertical distribution of above-ground nitrogen accumulation and canopy reflectance spectra in flue-cured tobacco (Nicotiana tabacum L.) was studied. It aimed at determining the contribution of leaf layers especially middle layer and lower layer to canopy reflectance, and constructing vertical distribution inversion model of nitrogen accumulation in different leaf layers and its combination in flue-cured tobacco. The field experiments with different nitrogen levels were conducted. The time-course measurements were taken on canopy spectral reflectance and weights and nitrogen contents in different plant parts and leaf layers during the experimental period. By means of analysis of correlation with experimental results, it was found that RVI(810, 680) could efficiently inverse the ANA in middle layer, upper-middle layer and the whole plant layers of flue-cured tobacco. DλRed could efficiently inverse the ANA of lower layer, middle-lower layer of flue-cured tobacco. It was concluded that ANA in middle, lower layer and the whole plantlets of flue-cured tobacco could be monitored directly by key vegetation indices. Source


Wang Y.,Shenzhen Tobacco Industry Co. | He J.,Shenzhen Tobacco Industry Co. | Xie T.,Shenzhen Tobacco Industry Co. | Wang F.,Shenzhen Tobacco Industry Co.
Acta Tabacaria Sinica | Year: 2013

Effects of different smoking regimes, i.e. ISO, Massachusetts and Canadian, on major carbonyl compounds in mainstream cigarette smoke were investigated by HPLC. Results showed that yields of major carbonyl compounds from Canadian regime were the highest, especially in low-tar, highly ventilated filter cigarettes. Source


Wei Z.,Shenzhen Tobacco Industry Co. | Sun H.-F.,Shenzhen Tobacco Industry Co. | Chen J.-B.,Shenzhen Tobacco Industry Co. | Xie T.,Shenzhen Tobacco Industry Co. | Wang F.,Shenzhen Tobacco Industry Co.
Journal of Chinese Mass Spectrometry Society | Year: 2013

A GC-QqQ-MS/MS method for the analysis of benzo(a)pyrene in mainstream cig-arette smoke was demonstrated. The total particulate matter (TPM) of 20 cigarettes in ma-instream smoke were trapped by Cambridge filter pad under standard smoking condition and extracted by cyclohexane with internal standard (ISTD). The solution was analyzed by GC-QqQ-MS/MS with positive ESI under multiple reaction monitoring (MRM) mode after be-ing cleaned upon solid phase extraction and determined by ISTD method under the optimized conditions. The calibration curves show good linearity for benzo(a)pyrene in the concentra-tion ranges of 0.4-20 μg/cig and the correlation coefficient is 0.99992. The LOQ is 0.073μg/L, the largest repeatability coefficient of variation is 3.71%, and the standard recovery rates are 95.7%-103.9%. Ease of operation, shorter procedure and little solvent make it suitable for benzo(a)pyrene determination, especially for low tar cigarettes. Source

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