Dry samples of fruit bodies of Cordyceps militaris and Agariucs blazei, mycelia of Antrodia camphorata, and hot water extracts of Ganoderma tsugae were ground and irradiated with γ-rays at doses of 0, 2.5, 5, and 10 kGy. After γ-irradiation, the content of γ-aminobutyric acid, adenosine, cordycepin, and triterpenoids in medicinal mushrooms did not significantly change. Gamma-irradiation only affects A. camphorata mycelia polysaccharide content, and an increase in irradiation dose (0-10 kGy) significantly reduces its content (111.85-101.88 mg/g). The content of high molecular weight (2.7×105 Da) polysaccharide in G. tsugae by γ-irradiation with increasing doses gradually increased. Gamma-irradiation could significantly affect the content of vitamin D2 and ergosterol. However, ergosterol content in non-irradiated C. militaris, A. blazei, A. camphorata, and G. tsugae was 2.34, 1.31, 2.33, and 1.15 mg/g, and of that in 10 kGy γ-irradiated mushrooms was 2.75, 1.88, 2.19, and 0.94 mg/g, respectively. Summarily, γ-irradiation does change some medicinal mushrooms by the content of physiologically active substances. When using γ-irradiation sterilization to maintain the physiological activity of mushroom products, one should consider its impact on the physiologically active substances.
Studies on physiologically active substances in citrus fruit peel. Part XX. Structure and physiological activity of phenyl propanoid glycosides in lemon (Citrus limon Burm. f.) peel.
