After juice sacs of Citrus unshiu was separated to membrane and serum, vola
tile components of each were collected using simultaneous distillation and
extraction apparatus under reduced pressure, and were identified by the cap
illary column GC-MS. Most of terpene hydrocarbons and all paraffin wax exis
ted in the membrane. While, terpene alcohols existed in the serum. Aldehyde
s existed in both part of membrane and serum. Since terpene hydrocarbons co
exist with paraffin wax in a membrane, it is assumed that the aroma of cann
ed mandarin orange is retained for the long storage period.