title: [Stable life predection for Mentha haplocalyx by initial average rate stability test].
abstract: OBJECTIVE
  To predict the stable life for Mentha haplocalyx.
  
  
  METHODS
  The volatiles in M. haplocalyx were analyzed by head-space solid micro-extraction, coupled with GC-MS and a comprehensive evaluation of essential oil in M. haplocalyx was analyzed using the factor analysis. The prediction was carried out by initial average rate stability tests using the content of essential oil and the main volatiles as indices.
  
  
  RESULTS
  Principal component analysis indicated that pulegone and isomenthone can fully describe the quality of prepared slices. The t(0.9, 20 degrees C) was 5.49 years and 2.88 years respectively, carried out by essential oil, pulegone and isomenthone.
  
  
  CONCLUSIONS
  The stable life for M. haplocalyx under 20 degrees C was 2.88 years.
authors: Institute of Chinese Materia Medica, Henan University, Kaifeng 475004, China.
authors: Jin-Mei
authors: JM
authors: Wang
authors: Chang-Qin
authors: CQ
authors: Li
authors: Wen-Yi
authors: WY
authors: Kang
mesh_terms: D000081005:Cyclohexane Monoterpenes; D004355:Drug Stability; D008401:Gas Chromatography-Mass Spectrometry; D027541:Mentha / Q000737:chemistry*; D039821:Monoterpenes / Q000032:analysis; D009822:Oils, Volatile / Q000032:analysis; D052617:Solid Phase Microextraction
chemical_list: D000081005:Cyclohexane Monoterpenes; D039821:Monoterpenes; D009822:Oils, Volatile; C039648:pulegone