环孢菌素产生菌的诱变选育

中国弯颈霉Tolypocladium sinense Li与雪白弯颈霉Tolypocladium nivcum(Rostrup)Bissct的孢子悬浮液经γ-射线Co~(60)辐射诱变后,产环孢菌素的得率及抑菌活性均明显提高.用黑曲霉Aspergillus niger和弯孢霉Curvularia lunata作为致敏菌。检测提取物中环孢菌素的抗菌活性,提取物抑制了致敏菌的菌丝生长和孢子形成.环孢菌素产生菌深层发酵培养基是蛋白胨—葡萄糖培养基,发酵周期12天.尔后发酵液用等体积的乙酸乙酯萃取,减压浓缩,每升发酵液获环孢菌素粗制品35—87mg.     

Mycelial fermentation and medicinal properties of a valuable medicinal fungus Cordyceps sinensis Cs-HK1

Cordyceps sinensis （Cs） or Dongchongxiacao in Chinese is a rare and precious medicinal mushroom. In this work, a Tolypocladium sp. fungus named Cs-HK1 was isolated from a natural Cs fruiting body, and its ultraviolet （UV）, infrared （IR） and high-performance liquid chromatography （HPLC） spectra all exhibited high degrees of matching to those of natural Cs, indicating the similarity of chemical composition. A crude polysaccharide （PS） fraction isolated from Cs-HKI fungal mycelium showed significant antitumor activity, inhibiting melanoma tumor growth in mice. The PS-treated mice showed significantly higher serum interferon-y （IFN-y） level and higher proliferation rate of lymphocytes ex vivo than the control animals, suggestive of the immunomodulatory activity of the PS fraction. In cell cultures, the PS fraction caused a significant and dose-dependent inhibitory effect on the proliferation of two cancer cell lines, B16/neu mouse melanoma and MDA-MB-231 human breast cancer cells, but not on normal spleen lymphocytes in vitro. Most of these bioactivities of the Cs- HK1 fungus were comparable to or even greater than those of natural Cs. The results showed that Cs-HK1 fungus may be a functional substitute for the natural Cs in health food and herbal medicine.     

弯颈霉属一新种的研究

云南省迪庆藏族自治州产的冬虫夏草经组织分离获得一纯种,在几种琼脂培养基上形成瓶梗及瓶梗孢子。瓶梗基部呈球形或椭园形膨大,瓶颈细长而弯曲,经鉴定隶属于弯颈霉属Tolypocladium W.Gams,但与弯颈霉属已知种有明显区别,故认为是弯颈霉属一新种,命名为中国弯颈霉Tolypocladium sinensis Li sp. nov,弯颈霉属的种类在中国从未发现和报导过,本文首次报导。中国弯颈霉经深层培养,培养基为蛋白胨葡萄糖,无机盐类,生长素等,26℃,PH5.2,振速100次/分,发酵周期12天。其分生孢子梗,瓶梗及瓶梗孢子的形态发生很大变异。发酵液经乙酸乙酯提取,减压浓缩,获粗提物,对几种丝状真菌具抑制作用,并与环孢菌素标准样品进行了对照和比较,证实中国弯颈霉能产生环孢菌素。     

中国弯颈霉ZN_(923)菌株代谢产物的初步研究

中国弯颈霉ZN92 3菌株在以葡萄糖、蛋白胨为主要原料的液体培养基中发酵培养 ,发酵液用等体积乙酸乙酯萃取 ,无水NaSO4 脱水 ,减压浓缩获粗提品 ,经紫外光谱、高效液相色谱、硅胶G薄层层析以及拮抗试验 ,均显示该发酵液中含有环孢菌素成分