摘要:為探究蟲生真菌蟬花不同菌株之間產絮凝劑的差異及絮凝劑的絮凝特性,以高嶺土法對36株蟬花菌株進行了高產絮凝劑的篩選及高產菌株的生長特性和絮凝性質的研究。實驗篩選出穩定、高產絮凝劑的蟬花菌株GZUIFR-6722,絮凝劑活性物質是其胞外聚合物。該菌株在生長過程中生物量的積累和產絮凝劑能力呈正相關。當菌株6722絮凝劑投加量為12mL每50mL時,絮凝效果較好,絮凝率可達9147%。1%的CaCl2能顯著促進絮凝效果,絮凝率可達9489%。顛倒次數、靜置時間、溫度以及pH對絮凝效果影響不顯著。
關鍵詞:微生物絮凝劑;蟬花;絮凝特性
中圖分類號:X172
文獻標識碼:A
文章編號:1008-0457(2017)03-00-0國際DOI編碼:10.15958/j.cnki.sdnyswxb.2017.03.001
Abstract:The aim of this paper is to study the bioflocculability and characteristics of different strains of Isaria cicadae by screening all 36 strains with kaolinThe results showed that GZUIFR-6722 strain can perform steadily with high bioflocculabilityThe active substrate was identified as some kind of extracellular metaboliteDuring the growth,the production of active substrate was related positively with the biomassThe flocculating rate was 9147% after addition of 12mL/50mL bioflocculantsMoreover,the addition of 1% CaCl2 could promote the performance of the bioflocculants,and increased the flocculating rate to 9489%Furthermore,the results also indicated that inversion,standing time,temperature and pH had no obvious effect on flocculationThe findings suggest for application of the GZUIFR-6722 strain in the treatment of waste water
Key words:microbial flocculants;Isaria cicadae;flocculation characteristics
蟬花(蟬棒束孢Isaria cicadae)是一種蟲草類真菌,對蚜蟲、小菜蛾、白粉虱等害蟲的防治效果較好[1,2],同時也是一味傳統名貴中藥,在糖尿病、抗腎纖維化進程、延緩腎衰竭等的臨床及實驗研究中,取得了較好效果[3,4]。迄今為止,對蟬棒束孢透明質酸、多糖及糖蛋白等活性物質[5-7]和抗衰老、改善免疫功能等[8,9]在醫療和保健上已有大量的研究報道,因此,蟬花是一種極具應用前景的高安全性的真菌資源。除此之外,也有研究發現蟬花能產生絮凝劑,郭旭輝等[10]率先發現蟬花發酵液具有絮凝活性,采用pH為70的馬鈴薯液體培養基150r/min、30℃搖床培養84h后絮凝率可達851%。孫嘉龍等[11]從土壤中分離到一株具高效絮凝活性的菌株3716,并對其培養條件與絮凝活性進行了研究,由此可見,蟬花的絮凝能力也可用于微生物絮凝劑的開發。
微生……