Effects of irradiation and drying on volatile components of fresh shiitake (Lentinsus edodes sing)
1998
Ming-Sheng Yang | Charng-Cherng Chyau. | Deng-Tsen Horng. | Jui-Sen Yang.
Fresh shiitake (Lentinus edodes Sing) was irradiated with doses of 0.5, 1 and 2 kGy using 60Co. Effects of gamma-irradiation and drying on the volatile composition of shiitake were studied by gas chromatography (GC) and GC-mass spectrometry. Irradiation above 1.0 kGy could inhibit the growth and mould decay of fresh shiitakes after harvesting. Irradiation with 2 kGy increased the eight-carbon volatile components of fresh shiitake. Treatment at 1 kGy irradiation of fresh shiitake produced some new volatile compounds in the dry product, such as methylethyl disulphide, sulphinylbis methane, methyl(methylthio)ethyl disulphide and N-(3-methylbutyl) acetamide. The eight-carbon compounds mostly disappeared after drying. The amount of sulphur-containing volatile compounds in dried shiitake became lower during irradiation. Irradiation with doses of 1 or 2 kGy of fresh shiitake did not increase the volatile content of shiitake after drying.
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