Physicochemical Properties and Shelf Life of Button Mushroom under Essential Oils with Chitosan Coating Treatment Marzieh Najafian-Jazi۱ , Mehrdad Jafarpour۲,۳* Mehrnoosh Kahvaei۴, Baktash Raeisi-Dehkordi۵, Niloufar Alamarvdasht۵ ۱-MSc in Horticulture, Islamic Azad University of Isfahan (Khorasgan) Branch ۲- Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran ۳- Associate Professor, Edible and Medicinal Mushroom Research Center, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran ۴- Ph.D. Student, Edible and Medicinal Mushroom Research Center, Faculty of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran ۵- Department of Horticultural Sciences, Faculty of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran *Corresponding author. E-mail: jafarpour@khuisf.ac.ir Received: ۵ March ۲۰۲۰ Accepted: ۲۲ May ۲۰۲۰ Abstract Agaricus bisporus is the most produced mushroom in the world due to its unique taste and valuable nutritional properties. For this purpose, a study in the form of a completely randomized design with ۵ treatments and ۳ repetitions was conducted, which includes (control) (chitosan ۲%) (chitosan ۲% + cinnamon essence ۲%) (chitosan ۲% + angelica essence with a concentration of ۲۰۰ ppm) (chitosan ۲% + cinnamon essence ۲% + angelica essence with a concentration of ۲۰۰ ppm). The properties of Agaricus bisporus were evaluated on days ۰, ۷, ۱۴, and ۲۱. The results indicated ۷ and ۱۴ days after storage, chitosan casing as well as chitosan essence + angelica and cinnamon essence increased the phenolic acid content compared to the control and zero days after storage. On the ۷th, ۱۴th, and ۲۱st days after storage, chitosan + angelica treatment showed the highest weight loss. The lowest weight loss was observed ۲۱ days after storage in control and chitosan treatment. The highest number of
soluble solids was observed ۷ days after storage in chitosan + angelica essence and chitosan + cinnamon essence. The highest color index L* was observed at zero days after storage in the control treatment. The highest color index a* was observed on the ۱۴th day of storage in the chitosan + angelica + cinnamon treatment and on the ۷th day of storage in the chitosan treatment. The lowest color index a* was obtained on the ۱۴th day of storage in the chitosan + cinnamon treatment and on the ۷th day of storage in the chitosan + angelica + cinnamon and chitosan + cinnamon treatments. The highest b* color index was observed in the control treatment at ۲۱ days after storage. In general, treatments showed different results on biochemical properties and post-harvest shelf life of Agaricus bisporus.