[1] Tobacco Yunnan Ind Co Ltd, Technol Ctr China, Dept Safety Evaluat, Kunming 650231, Peoples R China
[2] Yunnan Univ, Coll Chem Sci & Technol, Kunming 650091, Peoples R China
[3] Yunnan Normal Univ, Coll Chem & Chem Engn, Kunming 650500, Peoples R China