Objective To establish a method for determination of polysaccharide from the leaves of Sorbus tianschanica Rupr.and its bacteriostatic action. Methods Phenol-sulfuric acid method was used for extraction and determination of polysaccharides in Sorbus tianschanica Rupr. Its antibacterial action was studied by control experiment. Results Average content of polysaccharides in Sorbus tianschanica Rupr was 2.56%.The polysaccharides exerted bacteriostatic effect, especially on Bacillus subtilis. Conclusion The method is simple and accurate, and can provide theoretical basis and reference for relative research of Sorbus tianschanica Rupr.

ObjectiveTo investigate the prevalence of preoperative malnutrition and nutrition support among gastrointestinal cancer patients.MethodsA retrospective study was conducted based on the nutritional status and nutrition support of 336 gastrointestinal cancer patients who received elective radical surgery in Peking Union Medical College Hospital from April to December 2009.ResultsMalnutrition was found in 34.6％ gastric cancer patients,23.8 ％ colorectal cancer patients,and 23 ％ esophageal and cardiac cancer patients.The patients with worse nutritional status were given longer duration of nutrition support and higher energy intake.Conclusion Malnutrition occurs in gastrointestinal cancer patients,yet sometimes treated with inappropriate nutrition support.