Fecha de publicación: 04/01/2022 Fuente: Wipo Tobacco Agriculture The invention relates to a substance for reducing TSNAs of flue-cured tobaccos with different maturity degrees, an application and a baking process. The substance is an ascorbic acid solution, and the mass percentage concentration of the ascorbic acid solution is 0.5%, 1%, 1.5%, 2% and 2.5%. The substance provided by the invention can reduce TSNAs in the flue-cured tobacco. According to the invention, the ascorbic acid solution is applied to the flue-curing process of the tobacco leaves with different maturity degrees for the first time to reduce the TSNAs content in the flue-cured tobaccos with different maturity degrees, the total TSNAs content in the flue-cured tobaccos with different maturity degrees is reduced by 23%-29%, NNK, NNN and NAT are reduced by 21%-27%, 24%-30% and 25%-32% respectively, and the effect is very remarkable. Aiming at the tobacco leaves with different maturity degrees, the degradation rate of the TSNAs is improved by reasonably matching and using the ascorbic acid solution so that the quality of the tobacco leaves is remarkably improved, and the harm of the TSNAs to human health and living environment is reduced.