大团囊虫草L2分离鉴定及其发酵工艺优化(英文)

A strain isolated from the fruiting body of a fungus parasitized on Elaphomyces was identified as Cordyceps ophioglossoides based on the morphological characteristics and the analysis of ITS-5.8s rDNA sequence.The optimal medium composition(g·L-1),containing sucrose 66.0,yeast powder 10.0,silkworm chrysalises digest 30.0,MgSO4·7H2O 0.4,and KH2PO4 0.4,was found using fractional factorial design and a central composite design,and the optimization of cultural conditions obtained a result of seed age 6 days,inoculum size 6%(by volume),initial pH 5.6,temperature 24°C,shaking speed 160 r·min-1 by one-factor-at-a-time method.The maximum biomass reached about 20.2 g·L-1 after 90 hours culture under the optimal conditions.Elementary pharmacological activities showed that mycelia of C.ophioglossoides L2 from submerged culture promoted uterus growth in estrogendepleted mice.In the 15-litre scale-up fermentation,the mycelial biomass was around 19.1 g·L-1,indicating a promising prospect for this biotechnology and the potency to develop its medical value.