title: [Preparation and Determination of Insulin-like Growth Factor I in Deer Antler, Heart and Blood].
abstract: OBJECTIVE
  To optimize the method for preparation of the insulin-like growth factor I (IGF-I ) in deer antler, and to determine the IGF-I in deer antler, heart and blood.
  
  
  METHODS
  Ultrasonic extraction was used to extract IGF-I from different tissues of deer with ammonia-ammonium acetate buffer, followed by ultrafiltration and solid phase extraction to concentrate and purify the samples. At the same time, ethanol precipitation method was carried out in the purification of IGF-I ultrafiltratein deer antler, a parallel test proceeded and radio immune assay (RIA) was set to determine the IGF-I in deer antler, heart and blood.
  
  
  RESULTS
  The IGF-I (60.8 ng/g) in deer antler by solid phase extraction was only existed in 30% methanol aqueous solution which was much higher than that (46.1 ng/g) by ethanol precipitation method. The quantities of IGF-I in deer antler, heart and blood were significantly different, it was 61.9 ng/g in antler and 21.9 ng/mL in blood, while there was no IGF-I tested in deer heart.
  
  
  CONCLUSIONS
  Solid phase extraction is superior to ethanol precipitation method in preparing IGF-I in deer antler and it is clear that the IGF-I contained in deer antler is significantly higher than that in deer heart and blood, so it is the best choice to take IGF-I from deer antler.
authors.forename: Fan-bo
authors.initials: FB
authors.lastname: Chen
authors.forename: Jian-yuan
authors.initials: JY
authors.lastname: Yin
authors.forename: Jing-yan
authors.initials: JY
authors.lastname: Liu
authors.forename: Yu-xia
authors.initials: YX
authors.lastname: Yang
authors.forename: Dan-dan
authors.initials: DD
authors.lastname: Sun
authors.forename: Ji-hua
authors.initials: JH
authors.lastname: Liu
mesh_terms: D000818:Animals; D000999:Antlers / Q000737:chemistry*; D001688:Biological Products / Q000302:isolation & purification*; D001769:Blood; D003670:Deer; D007334:Insulin-Like Growth Factor I / Q000302:isolation & purification*; D009206:Myocardium / Q000737:chemistry*
chemical_list: D001688:Biological Products; D007334:Insulin-Like Growth Factor I