Study On Characteristics Of Oil Peony Seeds In Different Producing Areas

Oil peony seeds for oil refer to the seeds of peony varieties with full seeds,high yield and high oil content.The large amount of α-linolenic acid and linoleic acid contained in peony seed oil is an essential nutrient for the human body,and plays an important role in human health.The oil peony seed cake,one of the most important by-products during the seed oil preparation,contains numerous monoterpene glycosides.The oil peony is widely planted in China,and the nature of the soil and atmospheric temperature in different cultivation areas are different.The characteristics of oil peony seeds from different cultivation areas were evaluated to provide reference for the genuine study of oil peony seeds.In this paper,the thousand seed weight,oil content and kernel content of the oil peony seeds,the composition and content of main fatty acids,and the physicochemical characteristics(iodine value,saponification value,acid value and peroxide value)of peony seed oil of 48 samples from different cultivation regions were monitored and evaluated by national standard method;The content of monoterpenoid glycosides of peony seed cakes of 48 samples from different cultivation regions were monitored and evaluated by ultraviolet spectrophotometry and HPLC.The results showed that there were extremely significant difference between the thousand seed weight,the contents of main fatty acids in peony seeds and oil collected from geographically differences region.The samples from Chongqing cultivation area was characterized by highest value of thousand seed weight and the highest oil yield,and highest content of stearic acid and palmitic acid in all cultivation areas.The samples from Xiangyang cultivation area had the highest kernel content,linoleic acid and total content of the main FAs(TCFMG)compared with other cultivation areas.These geographical differences could be related to the variability in thousand seed weight,the contents of main FAs and the TCMFA,which may result from the differing amounts of precipitation,atmospheric temperature,and the nature of the soil.In this paper,the optimum resolution of the fifteen monoterpene glycosides was achieved on an ODS-AQ column.Acetonitrile(solvent A)and 0.5% potassium dihydrogen phosphate solution(pH 2.8)(solvent B)were used as the mobile phase by a gradient elution.Paeoniflorin showed the highest content amongst 15 monoterpene glycosides.It accounted for more than half of the total content of the fifteen monoterpene glycosides(TCFMG)in oil peony seed cake,followed by oxypaeoniflorin and albiflorin.The samples of different cultivation areas contain the different contents of monoterpene glycosides,mainly determined by their geographical variation.The higher level contents of monoterpene glycoside are believed to have more potential in medicinal application.The method thus could be used to control the quality of products from oil peony seed cakes.As a type of woody oleaginous plant and industrial crop with broad prospects,oil peony could be plant in most places in China.