Effect Of Cinnamaldehyde Fumigation Treatments On Quality, Antioxidant And Polyamines Of Shiitake Mushroom

Freshly harvested shiitake mushroom (Lentinus edodes) were used to explore the preservation mechanism of cinnamaldehyde fumigation treatments with different concentrations (1,5and10μL·L-1) on physical quality, antioxidant and polyamines. The reasearch provided the theoretical basis for the application of essential oil using on the preservation of the edible fungus. The main results were as follows:Results showed that cinnamaldehyde fumigation treatments had positive effects on quality of shiitake mushroom. Cinnamaldehyde fumigation treatment at5μL·L-1was most effective in delaying senescence of mushroom, whereas high concentrations (10μL·L-1) of cinnamaldehyde could result in chemical injury.5μL·L-1cinnamaldehyde fumigation treatment significantly inhibited the growth of bacteria and the increase of MDA, reduced the weight loss rate and the accumulation of proline. However, there was no significant difference in total phenol. Cinnamaldehyde fumigation treatments could increase the content of AsA and the activitives of antioxidant enzymes, including APX, CAT, SOD and GR. Moreover, cinnamaldehyde fumigation treatments enhanced the ability of scavenging free radicals and the total antioxidant activity. Among the all treatments,5μL·L-1cinnamaldehyde fumigation treatment presented the best effective.At the low temperature, cinnamaldehyde fumigation treatments inhibited the increasing of free spermidine and the decreasing of free putrecine, and made the content of free spermidine kept in a relatively stable level. At the beginning time of storage, cinnamaldehyde fumigation treatments increased the content of free spermine, and redused the content of free spermine at last. The treatments could increase the content of conjugated putrecine and spermine, improved the content of conjugated spermidine at some extent. In addition, at the last time of storage, cinnamaldehyde fumigation treatments could increase bound putrecine and spermine, but inhibited the bound spermine in the early. In general, cinnamaldehyde fumigation treatments could inmprove the ability that free polyamines transfer to conjugated and bound polyamines, keep higher conjugated and bound polyamines and maitained cell components. Thus, cinnamaldehyde fumigation treatments improved stress resistance of shiitake mushroom and prolonged the storage time.