<正>采用免疫亲和柱净化一反相HPLC法，对加标的奶酪样品中的黄曲霉毒素B1、B2、G2、G1和M1进行了检测，并运用梯度洗脱技术优化了色谱条件。结果表明：G1、B1和M1的线性范围为2～20μg/L，而B2和G2线性范围为0.6～6.0μg/L。B1、B2、G1、G2和M1的检出限分别为0.2、0.3、0.06、0.1和0.4μg/L；各组分在3个不同加标水平上的平均回收率都大干76%；相对标准偏差在1.7%～4.5%。

One year old seedlings of Cinnamomum longepaniculatum,Michelia platypetala, M. foveolata and Manglietia chingii were selected for this experiment. The purpose of this paper is to study the physiological and ecological effect of four tree species on the Pb stress in the soil,and to overalty evaluate resistance to Pb stress of the trees. The results showed that the harmfulness of leaves under the stress of different Pb2+concentrations were effected by concentration main effect, tree species×concentration and tree species×concentration×time interactive effect. On basis of variance analysis, multiple-factor comparison (SPSS11.5) and overall evaluation by subordinate function method, the resistance of four tree species to Pb stress could be ordered as : C. longepaniculatum,M, platypetala,M, chingii, M. foveolata.