为深入了解磷酸氢二铵(DAP)/尿素(UR)这种常用再造烟叶复配添加剂的作用机制，从热降解的角度研究了DAP/UR改性造纸法再造烟叶(DURTS)和未添加DAP/UR的造纸法再造烟叶(RTS)在热降解过程及热解生成羰基化合物上的差异。结果表明：（1）与RTS相比，DURTS降低了第2(142~275℃)和第5阶段(539~710℃)的热降解；同时也使得第4热降解阶段(372~539℃)的最大热降解速率由8.9 %/min下降至6.9 %/min，对应的峰值温度(Tp4)也升高了11.2℃。（2）DAP/UR使热释放的终止温度显著升高（由532℃上升至564℃），提升了再造烟叶在高温区的热稳定性。（3）DAP/UR复配体系对羰基化合物的生成均有明显的抑制作用，羰基化合物的生成总量降低了21.6%。（4）DAP/UR复配体系在改善RTS余味、刺激性、香气质、浓度和杂气方面作用明显。
Abstract
To deeply understand the role of diammonium phosphate (DAP)/urea (UR) compound additives in the quality improvement of reconstituted tobacco, the differences of the thermal decomposition process and the formation of carbonyl compounds between DURTS and RTS (the reconstituted tobacco sheet with and without DAP/UR system) were investigated. The results showed that: (1) compared with RTS, the second (142-275℃) and fifth (539-710℃) thermal degradation stages of DURTS gradually disappeared, and the maximal rate of weight loss during the fourth (372-539℃) thermal degradation stage reduced from 8.9 %/min to 6.9 %/min while the peak temperature (Tp4) increased by 11.2℃; (2) the end temperature of the second exothermal stage was increased from 532℃ to 564℃, which suggested that the thermal stability of RTS was enhanced by DAP/UR system; (3) the DAP/UR system inhibited the production of carbonyl compounds during the thermal decomposition process of reconstituted tobacco sheet, the yields of total carbonyl compounds reduced by 21.6%; (4) DURTS was obviously superior to RTS in terms of aroma quality, concentration, irritation, offensive odor and aftertaste, especially in reducing irritation and offensive odor.
关键词
磷酸氢二铵；尿素；造纸法再造烟叶；热解行为；羰基化合物
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Key words
diammonium phosphate; urea; paper-making process reconstituted tobacco; thermal behavior; carbonyl compounds
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参考文献
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