东湖富营养水体中藻菌异味性次生代谢产物的研究

以自制的开环吹脱捕捉（ＯＬＳＡ）装置富集东湖营养水的藻菌异味性次生代谢产物，并对这些化合物进行鉴定和周年测，同时计数水样中的藻、菌生物量。研究发现，东湖水体产生“土霉味”的主要成分为２－甲基异茨醇（ＭＩＢ），它来源于席藻和放线菌的次生代谢，其随季节变化的规律为一年有５个高峰期，即１月、４月和９月；并且，ＭＩＢ的浓度与水体富营养化程度以及席藻和放线菌的生物量呈正相关。

STUDY ON AQUATICD OFF FLAVORS IN EUTROPHIC DONGHU LAKE

The Donghu Lake,in Hube Province,is selected as a typical eutrophic water for the study.The off flavor compounds from different locations monthly were indentified and monitored in the years from 1995 to 1996.Meanwhile,the species and biomasses for algae and bacteria were identified and counted.It was found that the principal compound producing earthy musty odors in the Donghu Lake was 2 methylisobornel (MIB),which came from the secondary metabolites of P.tenue and Actinomycets. There were three apex periods for MIB occurrences,i,e.January,April and September.Furthermore,their concentrations were directly proportional to the eutrophication levels and the biomasses of P.tenue and Actinomycets.