title: [Research about effect of spray drying conditions on hygroscopicity of spray dry powder of gubi compound's water extract and its mechanism].
abstract: OBJECTIVE
  To investigate moisture content and hygroscopicity of spray dry powder of Gubi compound's water extract obtained at different spray drying conditions and laying a foundation for spray drying process of Chinese herbal compound preparation.
  
  
  METHODS
  In the paper, on the basis of single-factor experiments, the author choose inlet temperature, liquid density, feed rate, air flow rate as investigated factors.
  
  
  RESULTS
  The experimental absorption rate-time curve and scanning electron microscopy results showed that under different spray drying conditions the spray-dried powders have different morphology and different adsorption process.
  
  
  CONCLUSIONS
  At different spray-dried conditions, the morphology and water content of the powder is different, these differences lead to differences in the adsorption process, at the appropriate inlet temperature and feed rate with a higher sample density and lower air flow rate, in the experimental system the optimum conditions is inlet temperature of 150 degrees C, feed density of 1.05 g x mL(-1), feed rate of 20 mL x min(-1) air flow rate of 30 m3 x h(-1).
authors.forename: Jie
authors.initials: J
authors.lastname: Zong
authors.forename: Qi
authors.initials: Q
authors.lastname: Shao
authors.forename: Hong-Qing
authors.initials: HQ
authors.lastname: Zhang
authors.forename: Yong-Lan
authors.initials: YL
authors.lastname: Pan
authors.forename: Hua-Xu
authors.initials: HX
authors.lastname: Zhu
authors.forename: Li-Wei
authors.initials: LW
authors.lastname: Guo
mesh_terms: D003890:Desiccation / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D010316:Particle Size; D011208:Powders / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000032:analysis; D017155:Wettability
chemical_list: D004365:Drugs, Chinese Herbal; D011208:Powders; D014867:Water