Separation, purification and primary reverse cholesterol transport study of Cordyceps militaris polysaccharide / 中国中药杂志

The authors designed to separate, purify and determine the monosaccharide composition of the polysaccharide from Cordyceps militaris, and study its effect on reverse cholesterol transport in vivo by isotope tracing assay. Polysaccharides were separate and purify by ion exchange column Q-sepharose Fast Flow and size exclusion column Sephacryl S200HR; the molecular weight and monosaccharide composition of the polysaccharides were determined by high performance gel permeation chromatography and high performance liquid chromatography coming with pre-column derivation, respectively. Finally, three purified polysaccharides CMBW1, CMBW2 and CMYW1 were obtained, their total carbohydrate contents were 87%, 89%, 95%, respectively; their protein contents were 6.5%, 1.3%, 2.8%, respectively; their molecular weights were 772.1, 20.9, 13.2 kDa, respectively; CMBW1 was composed of mannose, glucosamine, rhamnose, glucuronic acid, glucose, galactose and arabinose with a molar ratio of 7.25: 0.17: 1.29: 0.23: 6.30: 11.08: 0.79; CMBW2 was composed of mannose, glucosamine, galactose and arabinose with a molar ratio of 2.40: 0.16: 2.92: 0.24; CMYW1 was composed of mannose, glucosamine, glucuronic acid and glucose with a molar ratio of 0.59: 0.57: 0.45: 25.61. Polysaccharide at 50 mg x kg(-1) could significantly improve the transport of 3H- cholesterol to blood and excretion from feces. All of the three purified polysaccharides CMBW1, CMBW2 and CMYW1 were heteropolysaccharide; and they could improve reverse cholesterol transport in vivo, the underlying mechanisms are being studied.

Effect of bisphenol A on semen quality of exposed workers: a pilot study / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To explore the semen quality of the workers exposed to the xenoestrogen bisphenol A (BPA) was explored.</p><p><b>METHODS</b>A cross-sectional study of 20 BPA exposed and 16 control workers with similar age, physical activities was performed. Tests included quantifying BPA in blood samples and investigating the quantity and quality of semen. Semen parameters were determined with the method recommended by WHO.</p><p><b>RESULTS</b>94.4% exposed workers were found BPA in blood, and the median was 101.94 microg/L. However, only 18.8% control subjects were found BPA in blood, and the median level was 0 microg/L. The sperm density of exposed workers [(68.65 +/- 44.00) x 10(6)/ml] was significantly lower than that of control [(118.56 +/- 98.36) x 10(6)/ml]. Relationship analysis showed the positive relationships (r = 0.44, P < 0.01) between the sperm with quick forward progression and BPA level in blood, negative relationships between the percentage of normal sperm and BPA level in blood (r = -0.62, P = 0.01).</p><p><b>CONCLUSION</b>BPA could affect the sperm density, and may influence the semen quality. More research should be performed on the effect and the mechanism of BPA on man.</p>