Abstract
Thermal degradation of ${\beta}-carotene$, major carotenoid present in cured tobacco leaves, were carried out at $400,\;600,\;and\;800^{\circ}C$ which are similar to temperatures existing in the combustion zones of cigarettes, and subsequent volatile degradation products were analyzed by combined gas chromatography-mass spectrometry. The volatile compounds identified from degradation products included 36 aromatic hydrocarbons, 10 ${\beta}-ionone-related$ compounds which have trimethylcyclohexane ring, and 7 others. Of these, 37 compounds including ${\beta}-cyclogeraniol$ had not been previously reported in the literature as thermal degradation products of ${\beta}-carotene$. The major compounds of degradation products at $400\;and\;600^{\circ}C$ were ${\beta}-xylene,\;{\alpha}-terpinene,\;{beta}-cyclocitral,\;ionene\;(1,2,3,4-tetrahydro-1,1,6-trimethyl\;naphthalene),\;{\beta}-ionone$, and dihydroactinidiolide. The major compounds at $800^{\circ}C$ were the above six compounds plus toluene.
잎담배의 중요(重要)한 색소성분(色素成分)인 ${\beta}-carotene$을 $400^{\circ}C,\;600^{\circ}C$ 및 $800^{\circ}C$에서 각각 열분해(熱分解)한 다음 생성(生成)된 휘발성(揮發性) 성분(成分)들을 GC 및 GC/MS에 의해 확인하고 분해온도(分解溫度)에 따른 생성물(生成物)의 차이점을 비교하였다. 각 온도별(溫度別) 분해생성물(分解生成物)로부터 36종(種)의 방향족(芳香族) 탄화수소(炭化水素) 10종(種)의 ${\beta}-ionone$ 관련화합물을 포함하여 53종(種)의 휘발성(揮發性) 화합물(化合物)을 확인하였고 이들 중에서 ${\beta}-cyclogeraniol$을 포함한 37종(種)의 화합물(化合物)은 ${\beta}-carotene$의 열분해생성물(熱分解生成物)로서 아직까지 보고되지 않은 성분(成分)들이다. 한편 $400^{\circ}C$와 $600^{\circ}C$에서 열분해(熱分解)했을 때의 중요(重要) 생성물(生成物)은 $p-xylene,\;{\alpha}-terpinene,\;{\beta}-cyclocitral,\;ionene(1,2,3,4-tetrahydro-1,1,6-trimethylnaphthalene),\;{\beta}-ionone$ 및 dihydroactinidiolide 등이었고, $800^{\circ}C$에서는 위에서의 6종(種)의 성분(成分) 이외에도 toluene이 많이 생성(生成)되었다.