AIM: To optimize and establish the extraction techn ology of water-soluble polysaccharides from Ulva pertusa. TLC was employed to determine the mainly neutral sugars in the Ulvan. METHODS: The orthogonal test was employed to test the effects of th e four factors including volume of water, temperature of extraction, time of ext raction and pH of water on the yield and total carbohydrate contents of water-s oluble polysaccharides from Ulva pertusa and optimize the extraction technol ogy. Five groups of parallel tests were carried out by the optimum parameters es tablished and the sugar constituents of products were analyzed by TLC. RESULTS: Temperature of extraction and time of extraction have sign ificant effects on the extraction yield of water-soluble polysaccharides from Ulva pertu sa, but, for total carbohydrate content, only temperature of extraction was a significant factor. The mainly neutral sugars were composed of rhamnose, xylose and glucose. CONCLUSION: The optimum extraction technology was A 1B 3C 3D 3 when the yield and total carbohydrate content were considered as preferential pa rameters.

Objective To investigate the preventive and therapeutic effect of Bushen Jiedu prescription on ionizing radiation induced sex hormone disorder.Methods Totally 72 adult rats with half male and half female were randonly divided into 6 groups,including control group,radiation group,Bushen Jiedu prescription group with male and female,with 12 rats in each group.After adaptive breeding for 2 d,the rats of Bushen Jiedu prescription group were given 0.2 ml water soluble granules of Bushen Jiedu prescription (1.38 g/ml) by gavage once a day for 10 days.At 11 d,the rats were irradiated by 5 Gy of 60Co γ-rays.24 h after radiation,6 rats in each group were executed to measure the level of sex hormone.The other rats were further gavaged with Bushen Jiedu prescription or its control once a day for 14 d,then were executed for sex hormone testing.Results At 1 d after radiation,the estrogen (E2) of female of Bushen Jiedu prescription group was significantly higher than that of radiation group (t =2.686,P ＜ 0.01).Compared with control group,the levels of follicule-stimulating hormone (FSH) (t =4.305,4.642,P ＜0.01) of male and female,the levels of luteinizing hormone (LH) of male radiation group,and Bushen Jiedu prescription group were increased (t =4.537,2.336,P ＜ 0.01).At 14 d after radiation,the levels of testosterone and luteinizing hormone in male rats of radiation group was higher than those in control group (t =-3.730,2.963,P ＜ 0.05),and the levels of E2 and progesterone of female was lower than those in control group (t =-5.424,-3.178,-2.690,-3.215,P＜0.01).Conclusions Ionizing radiation can induced sex hormone disorder,and Bushen Jiedu prescription can effectively inhibit this alteration,which indicates that Bushen Jiedu prescription is an ideal radiation protectant.