Method for reducing low-carbon alkane in tobacco extract

The invention belongs to the technical field of tobacco flavors and fragrances, and particularly relates to a method for reducing low-carbon alkane in a tobacco extract. The method comprises the following steps: (1) carrying out subcritical extraction on a tobacco leaf sample to obtain a tobacco crude extract, carrying out alcohol precipitation and impurity removal on the tobacco crude extract to obtain an extracting solution, and then concentrating the extracting solution to obtain a concentrate; and (2) carrying out molecular distillation separation on the concentrate at the temperature of 40-80 DEG C under the pressure of 0.001-0.01 mbar, and removing light components such that residual heavy components are the tobacco extract. According to the method, the content of low-carbon alkane in the tobacco extract is effectively reduced, offensive odor and irritation of the tobacco extract are reduced, and the sensory quality of the tobacco extract is improved. 本发明属于烟用香精香料技术领域，具体涉及一种降低烟草提取物中低碳烷烃的方法。本发明的方法包括以下步骤：(