The Study On Yangmei Pomace Flavonoids & Preliminary Analysis Of Yangmei Kernel Oil

Yangmei (Myrica rubra Sieb.et Zucc) belongs to the branch of Myrica, genus of Myrica. It is widely distributed in Zhejiang, Jiangsu, Fujian province of China. It was reported that Yangmei has the activity of antioxidation; the active components in peel of Yangmei tree can ease the pain of the stomach; and the plentiful flavonoids in leaves of Yangmei tree have apparent physiological function of antioxidation and antimicrobial.Yangmei residue is the byproduct of extracting Yangmei juice, the residue accounts for 7%~10% by weight. Last year, the output of Yangmei was 300,000 tons, and it will be greater. The Yangmei processing industry has formed, but the byproduct is not well utilized and developed. Yanmgei residue can be divided into Yangmei pomace, Yangmei pit and Yangmei kernel. In order to probe into the value of residue, this paper focused on the study of pomace and kernel, it would serve as a basis for the development and utilization of Yangmei residue.1. The optimum extracting condition of flavonoids from Yangmei pomace were studied in this article. We used ethanol to soak the Yangmei pomace and distilled the flavonoids using traditional heated extract and ultrasonic extract respectively. The results showed: (1) Ultrasonic extracting was better than traditional heated extract; (2)Testing pomace dried at 40C, the results from L9 (34) table showed that 60:1 of 60% ethanol to douse the dried Yangmei pomace for 24 hours, ultrasonic treatment lasted for 50 minutes twice, the extraction average rate was as high as 99.34%. Thecontent of flavonoids in the extraction liquid was as high as 3.04%; (3) The extraction rate of sample dried at 60C was highest, the extraction rate of samples which were dried at natural condition or higher temperature was lower.2. Adding extraction to two different Chemiluminescence systems, measured the ability of scavenging free radicals; adding extraction to pure lard system, measured the activity of restraining lard oxidation. The results showed that extraction has notable ability of scavenging free radicals, as well it could strongly restrain the oxidation of lard. The bioactivity increased as the increase of adding concentration. We could draw a conclusion that the extraction has strong activity of antioxidation.3. Distilling oil from Yangmei kernel, analysed the physical and chemic value of Yangmei kernel oil. The results showed that 9 kinds of fatty acids have been detected through GC/MS analysis, with main acid being linoleic acid (40.363%) and the total content of the unsaturated fatty acids is above 85%. We could draw a conclusion: Yangmei kernel oil has high nutritional value, it's a healthy oil.From what we have stated above, we could draw a conclusion that the Yangmei residue is a new kind of natural resource with very high value. Given further research, it is very promising to be used as natural food antioxidant and natural edible oil in food industry. Thus it will be very profitable to the Yangmei industry.