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反相乳液体系中丁腈橡胶的可控加氢反应 被引量:3
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作者 李紫阳 申凯华 《合成橡胶工业》 CAS 北大核心 2020年第6期463-467,共5页
采用水合肼/过氧化氢/硼酸氧化还原体系对丁腈橡胶(NBR)进行催化加氢,考察了反相乳液体系加氢反应温度、自由基调节剂种类及用量等因素对NBR加氢度和氢化丁腈橡胶(HNBR)凝胶含量的影响,利用傅里叶变换红外光谱仪对HNBR进行了表征。结果... 采用水合肼/过氧化氢/硼酸氧化还原体系对丁腈橡胶(NBR)进行催化加氢,考察了反相乳液体系加氢反应温度、自由基调节剂种类及用量等因素对NBR加氢度和氢化丁腈橡胶(HNBR)凝胶含量的影响,利用傅里叶变换红外光谱仪对HNBR进行了表征。结果表明,在反相乳液体系中可进行NBR加氢反应。当反应温度为50~60℃时,在体系中加入最佳亲水性调节剂丙烯酸和疏水性调节剂2,6-二叔丁基对甲酚反应5 h后,可制得加氢度为86%、凝胶质量分数小于5%的HNBR。 展开更多
关键词 丁腈橡胶 反相乳液体系 加氢反应 氢化丁腈橡胶 加氢度 凝胶 自由基调节剂
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Evaluation of Antitumor,Immunomodulatory and Free Radical Scavenging Effects of A New Herbal Prescription Seaweed Complex Preparation 被引量:3
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作者 LIU Xin SHAO Changlun +2 位作者 KONG Wenwen FANG Yuchun WANG Changyun 《Journal of Ocean University of China》 SCIE CAS 2013年第3期515-520,共6页
Seaweed Complex Preparation (SCP) is a clinical traditional Chinese medicine preparation which is composed of seven traditional Chinese herbs, and it has been used for treatment of lung cancer, liver cancer and dige... Seaweed Complex Preparation (SCP) is a clinical traditional Chinese medicine preparation which is composed of seven traditional Chinese herbs, and it has been used for treatment of lung cancer, liver cancer and digestive cancer. However, little infor- mation is available about the pharmacodynamic basis. The antitumor, immunomodulatory and free radical scavenging effects of SCP were evaluated in this study. Transplanted tumor in vivo method was used to determine the antitumor effect. The effects on spleno- cyte proliferation and phagocytosis of macrophages in tumor-bearing mice were measured by the MTT method and the phagocytizing cock red blood cell (CRBC) method respectively. The scavenging activities of SCP on DPPH and hydroxyl radicals in vitro were investigated. It was found that the medium-dose and high-dose of SCP could significantly inhibit the growth of transplanted hepatic tumor of murine hepatocarcinoma cell line H22, and promote proliferation of splenocytes and phagocytosis of macrophages. SCP possessed noticeable scavenging activities on DPPH and hydroxyl radicals. The antiturnor effects of SCP might be achieved by im- proving immune system and scavenging free radicals, which is in accordance with the viewpoint of traditional Chinese medicine in promoting the body resistance and eliminating pathogenic factors for cancer treatment. 展开更多
关键词 traditional Chinese medicine preparation Seaweed complex preparation ANTITUMOR IMMUNOMODULATORY free radicalscavenging
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