Abstract: The fruit body and mycelium of Phellinus igniarius were analyzed for general nutrient composition and the contents and activities of the main functional compounds, aiming to lay a foundation for further exploitation and utilization of P. igniarius. The following bioactivities were evaluated: 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity and antitumor potential against SW620 and HepG2 tumor cells. The results showed that the mycelium and fruiting body of P. igniarius had basically similar nutrient composition including protein, polysaccharide, amino acid, fat, fiber and mineral elements. The contents of water and ash (P < 0.05) as well as crude fiber (P < 0.01) in the mycelium were significantly lower than in the fruit body, while the contents of crude protein and crude fat was significantly higher than in the fruit body (P < 0.01). The fruit body and mycelium had the same composition of the 17 amino acids tested, and their total amino acid contents were 25.11% and 4.69%, respectively. The contents of polysaccharides, flavonoids and triterpenoids in the fruit body were significantly higher than in the mycelium (P < 0.01). The highest percentages of DPPH radical scavenging by polysaccharides, flavonoids and triterpenes from the fruit body were 77.14%, 61.37% and 49.97%, respectively. The highest percentages of inhibition of tumor cells by polysaccharides from the mycelium and fruit body were 21.45% and 32.86% for SW620, and 37.91% and 51.29% for HepG2 cells, respectively. The results showed that the nutrient composition of the mycelium and fruit body of P. igniarius is basically the same, having high nutrient contents. The liquid-state fermentation mycelium can alleviate the shortage of wild P. igniarius fruit body, and it likewise has great potential for exploitation and application.

Key words: Phellinus igniarius, mycelium, fruiting body, nutrients