title: [The contents and their change of nucleosides from natural Cordyceps sinensis and cultured cordyceps mycelia].
abstract: OBJECTIVE
  To compare the content of nucleosides from natural Cordyceps sinensis and cultured Cordyceps mycelia, and the effect of humidity and heat on the contents of nucleosides.
  
  
  METHODS
  The contents of nucleosides were determined using high performance capillary electrophoresis (HPCE). Beckman P/ACE System 5010 apparatus equipped with a UV detector and a Beckman untreated fused-silica capillary (57 cm x 75 microns, 50 cm effective length) were used. Before sample injection, the capillary was rinsed with 1 mol.L-1 sodium hydroxide and running buffer for 5 minutes, respectively. 20 kV was applied during separation. Pressure injection was 586 kPa for 6 seconds, and the wavelength of detector was 254 nm. The running time was 20 minutes at 20 degrees C. The effect of humidity and heat on the content of nucleosides from natural Cordyceps sinensis and cultured Cordyceps mycelia was observed for 1, 3, 5 and 10 days at temperature 40 degrees C, and relative humidity 75%.
  
  
  RESULTS
  The contents of nucleosides from cultured Cordyceps mycelia were higher than that of those from natural Cordyceps sinensis. The contents of nucleosides from freshly collected natural Cordyceps sinensis, were under the detection limit. The contents of nucleosides from natural Cordyceps sinensis were significantly increased by effect of humidity and heat, the phenomenon was not observed in cultured Cordyceps mycelia.
  
  
  CONCLUSIONS
  There are difference in nucleosides content between natural Cordyceps sinensis and cultured Cordyceps mycelia. The nucleosides in natural Cordyceps sinensis may be derived from the degradation of macro-molecular nucleic acids. That means it is probably controversial that adenosine was used for quality control of natural Cordyceps sinensis.
authors.affiliation: First Affiliated Hospital of Anhui Medical University, Hefei 230022, China. shaopingli@ah163.com
authors.forename: S P
authors.initials: SP
authors.lastname: Li
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: H
authors.initials: H
authors.lastname: Ji
authors.forename: P
authors.initials: P
authors.lastname: Zhang
authors.forename: T T
authors.initials: TT
authors.lastname: Dong
authors.forename: K W
authors.initials: KW
authors.lastname: Tsim
mesh_terms: D000241:Adenosine / Q000032:analysis*; D000818:Animals; D032661:Cordyceps / Q000737:chemistry*; D046508:Culture Techniques; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D006151:Guanosine / Q000032:analysis*; D007915:Lepidoptera / Q000737:chemistry*; D014529:Uridine / Q000032:analysis*
chemical_list: D004365:Drugs, Chinese Herbal; D006151:Guanosine; D000241:Adenosine; D014529:Uridine