title: [Chemical variability of essential oils in peels collected in different time from Citrus reticulata 'Ponkan'].
abstract: OBJECTIVE
  To study the chemical variation of essential oils in peels collected from Citrus reticulata' Ponkan' in different time.
  
  
  METHODS
  The volatile oils were extracted by steam distillation and analyzed by GC-MS. The oil components were identified by their mass spectra and Kovats retention indices (RIs) and quantified by the area normalization method.
  
  
  RESULTS
  A total of 68 compounds were identified in 6 samples harvested in different time, and the total contents of identified compounds in each sample were from 94.27% to 97.12%. The highest content compounds were d-limonene, gamma-terpinene and linalool representing 56.862%-67.728%, 9.298%-11.081% and 4.792%-7.893%, respectively. There was little difference in the chemical components between different samples, but a great variation in quantitation between the former 2 samples and the latter 4 samples.
  
  
  CONCLUSIONS
  The chemical variability of essential oils from 6 Citrus reticulata 'Ponkan' peel samples presents a regularity.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Hong-ping
authors.initials: HP
authors.lastname: Chen
authors.forename: You-ping
authors.initials: YP
authors.lastname: Liu
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wei
mesh_terms: D000080462:Acyclic Monoterpenes; D002957:Citrus / Q000737:chemistry*; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes / Q000032:analysis; D005638:Fruit / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D000077222:Limonene; D039821:Monoterpenes / Q000032:analysis*; D009822:Oils, Volatile / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D010938:Plant Oils / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D012621:Seasons; D013729:Terpenes / Q000032:analysis
chemical_list: D000080462:Acyclic Monoterpenes; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D039821:Monoterpenes; D009822:Oils, Volatile; D010938:Plant Oils; D013729:Terpenes; C018669:gamma-terpinene; D000077222:Limonene; C018584:linalool