title: [Optimization of processing technology for pieces of sulfur-free Chinese yam].
abstract: OBJECTIVE
  To optimize the best gradient drying technology of pieces of sulfur-free Chinese yam, and provide technique parameter for processing of pieces of sulfur-free Chinese yam.
  
  
  METHODS
  Determined the content of polysaccharide by UV and the content of allantoin by HPLC. The optimum gradient drying technology of pieces of sulfur-free Chinese yam was investigated by orthogonal experiment and single factor experiment and the contents of polysaccharide and allantoin were regarded as the investigated indexes.
  
  
  RESULTS
  The optimum processing technology of first gradient drying stage was A2B2, that was drying for 60 min at 115 degrees C; The optimum drying temperature of second drying stage was 65 degrees C.
  
  
  CONCLUSIONS
  The optimum technology is stable and feasible for the processing of pieces of sulfur-free Chinese yam.
authors.affiliation: College of Traditional Chinese Medicine,Hebei University, Baoding 071000, China. hanboxun@163.com
authors.forename: Bo
authors.initials: B
authors.lastname: Han
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Ma
authors.forename: Li-Jing
authors.initials: LJ
authors.lastname: Hao
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhao
authors.forename: Song-Yun
authors.initials: SY
authors.lastname: Cao
mesh_terms: D000481:Allantoin / Q000032:analysis; D003890:Desiccation / Q000379:methods*; D027742:Dioscorea / Q000737:chemistry; D004345:Drug Industry; D004365:Drugs, Chinese Herbal / Q000737:chemistry* / Q000592:standards; D011134:Polysaccharides / Q000032:analysis*; D011786:Quality Control; D027343:Rhizome / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013678:Technology, Pharmaceutical / Q000379:methods*; D013696:Temperature
chemical_list: D004365:Drugs, Chinese Herbal; D011134:Polysaccharides; D000481:Allantoin