The invention discloses a preparation method for a fructus gardeniae extract for tobacco. The preparation method is characterized by comprising the following steps: (1) crushing fructus gardeniae fruits, adding the crushed fructus gardeniae fruits into an extracting tank, adding water, and adding lactobacilli and complex
enzyme for fermenting to obtain fructus gardeniae fruit
fermentation liquid, wherein the fructus gardeniae fruit and the water are in the
mass ratio of 1 : (20 to 40); (2) performing
alcohol precipitation and purification on the fructus gardeniae fruit
fermentation liquid to obtain secondary fructus gardeniae concentrated liquid; (3) performing molecular
distillation refining, namely, performing vacuum concentrating on the secondary fructus gardeniae concentrated liquid to obtain
tertiary fructus gardeniae concentrated liquid, adding
propylene glycol, performing further separation and purification on the
tertiary fructus gardeniae concentrated liquid in molecule
distillation equipment, collecting a light component, performing molecular
distillation purifying on a heavy component again, and combining two light components to obtain the fructus gardeniae extract for the tobacco. According to the preparation method, the fructus gardeniae extract for the tobacco is prepared by adopting compound fermenting,
solvent low-temperature extracting and molecular distillation refining, and is applied to reconstituted tobacco, so that the appearance colour and lustre of the reconstituted tobacco are more natural and uniform, and are close to those of high-quality tobacco; the pH value of
smoke is reduced;
aroma is enriched; stimulation and miscellaneous gas are reduced; the smoking taste is improved.