变性淀粉对河粉凝胶品质的影响研究

添加变性淀粉能改善河粉的凝胶特性.从9种变性淀粉中筛选出一种能使河粉的凝胶特性明显改善的变性淀粉,并通过正交试验得到其最佳作用条件为:保湿凝胶时间30 min,变性淀粉添加量2.0%,河粉水分55%.     

液体葡萄糖生产工艺及酶作用研究

详细地研究了液化、糖化条件对液体葡萄糖DE值、过滤性质的影响，考察了液化酶、糖化酶之间的相互作用，确定了液体葡萄糖的最佳生产工艺，为工业化生产液体葡萄糖提供了理论依据。     

啤酒用麦芽糖浆生产工艺研究

以玉米淀粉为原料、利用α-淀粉酶、真菌淀粉酶、啤酒废酵母进行液化、糖化,有机地将糖化、酵母自溶结合在一起,得到成分与麦芽汁相似的淀粉糖浆,可作为啤酒发酵过程中麦芽汁的代用品.     

沙棘叶黄酮的提取及抑菌作用研究

本实验以中国青海产中国沙棘叶和内蒙古产大果沙棘叶为原料,分别选择水与乙醇作提取溶剂,以超声波辅助浸提提取。采用紫外-可见光分光光度法测定了提取物的总黄酮和总酚含量,采用管碟法和试管两倍稀释法测定提取物对13种常见食品污染微生物的抑制效果。结果表明,青海产中国沙棘叶提取物的总黄酮含量和提取物抑菌活性均优于内蒙古产大果沙棘叶;乙醇提取物总黄酮含量和抑菌效果均显著优于水提取,超声辅助提取有助于提高提取物的抑菌活性。     

“洋河蓝色经典”工艺特征、环境因素及微量成分与人体健康的关系

“洋河蓝色经典”酒采用独特的多粮酿造、多粮制曲、多工艺配合，加之得天独厚的地域环境，采用甘甜绵软、矿物质丰富的“美人泉水”精心勾调，造就了高品位的“绵柔”品质；特殊的酿造工艺赋予了酒体中丰富的微量元素、低分子有机酸、高级脂肪酸及乙酯、酚类化合物等微量成分对人体健康有良好的功效。     

猴头菌转化银杏叶提取物(EGB)工艺条件的研究

在前期优化培养基的基础上,本实验比较了摇瓶的温度、pH、装液量和发酵罐培养的通气量、转速和培养时间等不同培养条件对猴头菌转化EGB生物活性的影响。结果显示,含有0.5%的EGB培养基中,猴头菌转化EGB温度为25～30℃,初始pH范围为5.5～6.5,此时对非酶糖基化反应的抑制率较高。同时添加10g/LCaCO3可稳定pH,提高发酵液对非酶糖基化反应的抑制率。20L发酵罐转化EGB最佳工艺条件为72h前通气量为8L/min,72h后为4.8L/min,转速为120r/min。     

Atmospheric Hexachlorocyclohexanes in the North Pacific Ocean and the adjacent Arctic region: spatial patterns, chiral signatures, and sea-air exchanges

During the 2003 Chinese Arctic Research Expedition (CHINARE2003) from the Bohai Sea to the high Arctic (37 degrees N to 80 degrees N) aboard the icebreaker Xuelong (Snow Dragon), air samples were collected for the analysis of hexachlorocyclohexanes (HCHs) in the North Pacific Ocean and adjacent Arctic region. The sigma HCHs (alpha-HCH + gamma-HCH) ranged from 2.3 to 95.1 pg/m3 with the highest levels observed in Far East Asia (32.5 pg/m3), followed by the North Pacific Ocean (17.0 pg/m3) and the Arctic (7.3 pg/ m3). Compared to previous studies in the same areas in 1990s, our measurements were approximately 1 order of magnitude lower. Because of disproportionate chemical reduction and physical fractioning during long-range transport, the ratios of alpha-HCH to gamma-HCH (alpha/gamma-HCH) showed a significant increasing trend from low to high latitudes, suggesting thatthe alpha/gamma-HCH range of 4-7 could not be used to identify sources of technical HCHs especially in remote areas. The ratios of (+)-alpha-HCH to the sum of (+)-alpha-HCH and (-)-alpha-HCH were on average much more biased from 0.5 compared to previous observations in mid-1990s, indicating the exchange of atmospheric alpha-HCH with those in the oceans, where (+)-alpha-HCH was selectively depleted in biological degradation processes. Estimated fugacity ratios based on available data for both alpha-HCH and gamma-HCH further implied their net volatilization from seawater to air in the Arctic Ocean.     

脂肪酶固定化研究及应用初探

以不同的廉价国产大孔树脂为载体,吸附法固定化脂肪酶。重点考察了以大孔树脂b为载体时,酶液浓度、吸附温度和时间、缓冲液pH及离子强度对脂肪酶固定化效果的影响。结果表明,以pH8.5,0.1mol/L的磷酸盐缓冲液为介质,在酶液浓度20mg/mL,固定化温度35℃的条件下,吸附4h,得固定化酶水解活力为137.39u/g,固定化酶的最适pH和温度都比游离酶高。该固定化脂肪酶催化合成结构脂质,连续使用4批催化活力没有任何改变,具有一定的开发潜力。     

不同方法萃取蜂胶挥发油组成及抑菌作用的研究

采用水蒸气蒸馏法和超临界二氧化碳萃取法获得了蜂胶挥发油。GC-MS 分析并鉴定出50 种化合物,两种提取方法所得蜂胶挥发油在成分组成上存在显著差异。抑菌实验表明,两种提取方法获得的挥发油对金黄色葡萄球菌、枯草芽孢杆菌、铜绿假单胞菌具有很强的抑制作用,而超临界法萃取的挥发油的抑菌效果强于水蒸气蒸馏法。     

Tencel绢丝棉混纺竹节纱的开发

探讨Tencel绢丝棉混纺竹节纱生产工艺。针对Tencel绢丝原料特点,通过原料预处理,提高可纺性,各工序优选配置工艺参数,重点解决好黏卷、梳棉成网不良,并条不易混和均匀等关键问题,结果成功开发出Tencel/绢丝/棉40/30/30 46 tex混纺竹节纱,较好地满足了提升织物附加值的要求。