海洋多肽的提取纯化及生物活性研究进展

海洋生物是人类重要的食物来源，其中含有大量高质量的蛋白质。海洋多肽具有抗高血压、抗氧化、抗肿瘤等生物学功能，作为开发功能性食品和药品的来源具有巨大的潜力。本文介绍了近年来国内外利用化学水解法、酶水解法、微生物发酵法以及物理辅助提取法提取海洋多肽并采用色谱法、膜分离法将其分离纯化的相关技术，比较了它们之间的差异性，并对海洋多肽的血管紧张素转换酶（ACE）抑制活性、抗氧化活性和抗肿瘤活性等生物活性以及应用现状进行了综述。     

引入天然黏合剂作为黏合层的复合膜用于渗透蒸发乙醇脱水(英文)

A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol. Chitosan (CS) and polyacrylonitrile (PAN) ultrafiltration membranes were used as the active layer and the support layer, respectively. Guar gum (GG), a natural bioadhesive, was in-troduced as the intermediate bonding layer to improve the separation performance and stability of the fabricated CS/GG/PAN composite membranes. The contact angle of the GG layer was just between those of the CS layer and the PAN layer, minimizing the difference of hydrophilicity between the active layer and the support layer. The peeling strength of the composite membrane was significantly enhanced after the introduction of the GG layer. The effects of preparation conditions and operation conditions including GG concentration, operating tempera-ture and ethanol concentration in feed on the pervaporation performance were investigated. The as-fabricated CS/GG/PAN composite membrane showed the optimum performance with a permeation flux of up to 804 g·m?2·h?1 and a separation factor higher than 1900. Besides, the composite membranes exhibited a desir-able long-term operational stability.     

羟丙基瓜尔胶的催化氧化降解研究

羟丙基瓜胶具有良好的黏稠性,广泛应用于油气田开发中,但它会使油田采出污水中的聚合物含量超标,处理难度较大。为此,本文制备了3种金属配合物催化剂,对其进行红外和紫外表征,评价了其催化氧化降解羟丙基瓜尔胶的性能。结果显示,所制备的3种金属配合物催化剂中,铁离子的效果最佳,当温度为45℃、pH为7、催化剂用量为0.5%、H_2O_2用量为8%时,可以将羟丙基瓜尔胶溶液的相对黏度从26降低至0.87。     

多孔翻孔模设计

介绍了多孔翻孔模设计和翻孔工艺,有利于提高翻孔零件的生产效率,对传统单孔翻孔模翻孔零件的生产有了极大的改进。