title: [Preparation and quality control of soybean isoflavone dropping pills].
abstract: OBJECTIVE
  To establish the optimized preparation procedure and study the method to determine the content for soybean isoflavone(SIF) Dropping Pills.
  
  
  METHODS
  The preparation conditions, such as the proportion between SIF and PEGs, the temperature of mixture of SIF and PEGs, dropping distance, etc., were studied with Uniform Design and One-way ANOVA. SIF was identified by TLC and the content of SIF was determined by UV spectrometry at 262 nm detection wavelength.
  
  
  RESULTS
  Three batches of the prepared products meet the standards of the Chinese pharmacopoeia on dropping pills. SIF can be identified by TLC. Using UV spectrometry, the linear range of SIF was 0. 407 2 to 4. 072 g x mL(-1) and the correlation coefficient was 0. 999 8. In high, middle and low concentration, average recovery were 96. 54%, 97.27% and 97.21%, respectively (RSD were 1.3%, 0.78% and 0.71%).
  
  
  CONCLUSIONS
  The preparation procedure is feasible, simple and suitable, the method established in this paper can be adopted for the quality control of SIF dropping pills, and the determination method is simple, relatively fast and accurate.
authors.affiliation: Guiyang College of Traditional Chinese Medicine, Guiyang 550002, China.
authors.forename: Cai-Bin
authors.initials: CB
authors.lastname: Jiang
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Lin
authors.forename: Li-Mei
authors.initials: LM
authors.lastname: Yu
mesh_terms: D002855:Chromatography, Thin Layer; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000302:isolation & purification*; D007529:Isoflavones / Q000032:analysis / Q000302:isolation & purification* / Q000592:standards; D010316:Particle Size; D010946:Plants, Medicinal / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D011786:Quality Control; D013025:Glycine max / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004365:Drugs, Chinese Herbal; D007529:Isoflavones; D011092:Polyethylene Glycols