Improving the Storage Quality of Shiitake Mushroom by Intense Pulsed Light Pretreatment Combined with Humidity-controlled Drying
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Abstract:
The effects of intense pulsed light (IPL) pretreatment combined with humidity-controlled drying on storage quality of shiitake mushroom were evaluated. The results showed that IPL pretreatment could reduce the respiration rate of fresh and dried shiitake mushroom, by 76.69% and 84.65%, respectively, and improved the retention rate of reducing sugar during storage. The polyphenol oxidase (PPO) activities of the fresh and dried shiitake mushrooms during storage were 1.73 times and 1.39 times that of the IPL-pretreated samples, respectively, and the enzymatic browning reaction was inhibited, thereby increasing the retention rate of total phenols. IPL treatment was found to improve the quality, polysaccharide retention rate, and antioxidant capacity of fresh and dried shiitake mushroom during storage and delayed softening. IPL treatment also reduced the total bacterial count of fresh shiitake mushroom (from 6.43~8.02 to 3.29~4.66 log CFU/g) but had little effect on the total bacterial count of dried shiitake mushroom. IPL treatment improved the storage quality of shiitake mushrooms to a greater degree than did blanching treatment. Therefore, IPL treatment can be used as a stable pretreatment method for the drying and preservation of shiitake mushrooms.
