title: Effects of ripening, 1-methylcyclopropene and ultra-high-pressure pasteurisation on the change of volatiles in Chinese pear cultivars.
abstract: BACKGROUND
  Aroma is one important fruit sensory attribute influenced by the volatile constituents related to species, variety and technological treatments. We analysed the variations of volatile compounds in five pear cultivars and investigated their changes related to different pear organs, different ripening stages, 1-MCP treatment and ultra-high-pressure pasteurisation.
  
  
  RESULTS
  Considerable variations exist in the quantity of 10 volatile compounds among five pear cultivars. Their levels generally showed an increasing trend when collected at later harvest time in Ya pear. In Whangkeumbae pear, most volatile compounds reached their maximum levels in skin and pulp. After treating pears with 42 µmol L(-1) 1-methylcyclopropene (1-MCP), the levels of volatiles remained basically unchanged or only slightly increased in Ya pear during a shelf life of 21 days. When Huangguan pear juice was pasteurised by using ultra-high pressure, the levels of volatiles significantly changed during the shelf life.
  
  
  CONCLUSIONS
  The volatile compositions of five different Chinese pear cultivars differ considerably. The levels of these volatiles vary along with ripening stages and pear tissues. A moderate concentration of 1-MCP could keep the levels of volatile compounds basically unchanged during storage and ultra-high-pressure pasteurisation could change the levels of volatiles significantly during the following shelf life.
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Kou
authors.forename: Xiangping
authors.initials: X
authors.lastname: Liu
authors.forename: Jiangkuo
authors.initials: J
authors.lastname: Li
authors.forename: Huazhi
authors.initials: H
authors.lastname: Xiao
authors.forename: Jiehua
authors.initials: J
authors.lastname: Wang
mesh_terms: D001628:Beverages; D002681:China; D003521:Cyclopropanes / Q000494:pharmacology*; D005638:Fruit / Q000254:growth & development / Q000378:metabolism*; D009812:Odorants; D061352:Pasteurization / Q000379:methods*; D028321:Plant Preparations; D011312:Pressure; D031989:Pyrus / Q000145:classification / Q000254:growth & development / Q000378:metabolism*; D013045:Species Specificity; D055549:Volatile Organic Compounds / Q000378:metabolism*
chemical_list: D003521:Cyclopropanes; D028321:Plant Preparations; D055549:Volatile Organic Compounds; C412563:1-methylcyclopropene