Study on the Configuration-Changing and Stability of Lycopene in the Process of Microemulsion Preparation and Storage

Abstract:

Due to its abundant conjugated double bonds in the molecule,lycopene is highly unsaturated and tend to configuration-changing and/or oxidative degradation during its procession and storage.In this paper,we studied the configuration-changing and total amount changes of lycopene in the process of microemulsion preparation and storage via Cosmosil Cholester-HPLC system.The results indicated that all-trans lycopene would be transferred into 4 different cis-isomers besides all-trans itself in the process of microemulsion preparation,the ratio of all-trans lycopene,9-cis lycopene,13-cis lycopene,x1-cis lycopene and x2-cis lycopene were 43.99%,17.96% 15.65%,7.85%and 9.64%respectively in lycopene microemulsion,while 9-cis lycopene was more stable than 13-cis lycopene during the storage.After storing at 4 ℃ for 40 days,93.4% of trans-lycopene and 80% of total cis-lycopene were retained,however,at 37 ℃ for 40 days,76.4% of trans-lycopene and 21.2% of total cis-lycopene were retained respectively.