Plum Preservation Storage Process Parameters And PPO Enzyme In The Microbiology Characteristics

This text tried a material with the main species of 14th Plum cultivation in our country, which analyzed 14th Plum suitable for preservation temperature and suitable packaging Li during fruit physiological changing preserve; and analyzed MA, CA influence correctly to preserve 14th Plum, which proposes suitable for gas of characteristic transfer the index and preserve time of fruit physiological. Still researched to the zymology characteristic which causes brown key enzyme- many phenol oxidize that changes of fruit at the same time, in order to find the method of controlling the oxidize activity of many phenol. For offering theoretical foundation after the complexion Plum preserving problem and enzyme of processing course urge becoming to brown. The test results showed that:1. The suitable storage temperature condition for the plum is Between-1℃and0℃. Pass to a few analyses that the horary fruit adopts young man reason, quality, taste, etc. We discovered that low in -1℃fruits be very seriously harmed by jelly, but high in 0℃fruits brown become severity, and decrepitude, putrefied quickly .Therefore, we drawled a conclusion that suitable storage temperature of 14th Plum is Between-1℃and0℃.2. 14th Plum fruits of the packing and the silicon window film packing of the 0.025 mmPE in the middle of refrigerating can adjust extension storing of fruit through a self-moving spirit period; Though various packing of the fruits solid sour ratio general with store horary of extension but ascension, degree of hardness with store time of extension but descend, all show outstanding ground low in CK. When Stored to 25 days , managed combination fruit everywhere solid sour everywhere CK low 78.0%-96.6%;Storing a last phase, managing a combination the putrefied rate of the fruit everywhere is everywhere lower than the CK 28.2%-69.5%.In the middle of refrigerating, we can see the plum fruit packed in 0.025mm PE sack is better than the control.3. 14th Plum adjusted the suitable atmosphere condition as low O₂ with low CO₂: The research discovered the controlled atmosphere (CA) of 6%-8% O₂+0%-1% CO₂ adjusted a hoarding condition to show outstanding to repress to adopt behind 14th Plum fruits can the titration sour content descend, breath velocity with solid sour ratio of ascension, the flesh of fruits is brown to change, prolonging hoarding time, storing for 50 days, the flesh of fruits isn't brown to change. But 14th plum fruits are very sensitive to CO₂ when the O₂ concentration kept constant and the CO2 concentration was 4%-6%,14th Plum fruits appeared no oxygen breath, breathing velocity speed, brown become severity. When the density of CO₂ continues to go up(density is 6%-8%), having no oxygen breath speed, brown change severity.4. Plum phenol oxidize the research that the enzyme learns characteristic: Benzodiazepine Phenol for bottom thing, Lee's polyphonic oxidizes enzyme of the most suitable enzyme respond temperature for 30℃;The most suitable pH is worth to 5.5;The Km is a 124.8 mmols/L, the Vm is 0.435⊿ OD/minutes at 90℃is hot to handle for 2 minutes can the bluntness turn the activity that the phenol oxidizes enzyme Anti- bad blood's sour is a strong depressant with sulfurous acid sodium, quality score for the anti- of 317 mgs/kg the bad blood is sour with the sulfurous acid sodium of 189 mgs/kg can repress the activity that the polyphone oxidizes enzyme effectively.