尿素包合法纯化葡萄籽油中亚油酸的研究

利用尿素包合法对葡萄籽油中亚油酸的分离纯化进行研究.分析了包合温度、包合时间、甲醇尿素质量比、混合脂肪酸尿素质量比4个因素对亚油酸纯度及得率的影响,并在单因素实验的基础上通过正交实验确定最佳工艺条件.结果表明:在包合时间12h,包合温度-4℃,甲醇尿素质量比5∶1,混合脂肪酸尿素质量比1∶1的条件下,亚油酸纯度最高为89.9％.     

尿素包合法纯化棉籽油中亚油酸的研究

利用尿素包合法对棉籽油中亚油酸进行纯化研究.通过正交试验确定其最佳提取条件,结果表明:尿素/甲醇为3:1,脂肪酸,尿素用量为0.8:1,包合时间为24 h,包合温度为-5 ℃,在此条件下亚油酸纯度达到90.7%.     

脲包法富集高纯度红花油亚油酸甲酯的研究

以亚油酸含量81．74％的红花油为原料，采用先碱性醇解，后尿素包合的方法。从红花油中富集亚油酸。通过正交试验，确定了尿素一次包合法富集高纯度亚油酸甲酯的最佳工艺条件：混合脂肪酸甲酯：尿素：甲醇为1．04：1：4(W／W／V)，包合温度-10℃，包合时间24h，亚油酸甲酯得率72．95％，纯度99．27％。     

尿素包合法纯化火棘籽油亚油酸与鲨烯工艺

以火棘籽油为原料,采用尿素包合法对其亚油酸进行纯化,并在此基础上通过柱层析分离出鲨烯。通过单因素试验、正交试验和气相色谱-质谱联用(gas chromatography-mass spectroscopy,GC-MS)分析方法,研究尿素包合过程中包合时间、包合温度及火棘籽油、尿素和乙醇之间的配比等因素对亚油酸纯度和回收率的影响。结果表明：火棘籽油在原料:尿素:乙醇＝1:2:6(g/g/mL)、－5℃条件下包合12h,其亚油酸纯度从38.40%提高到68.55%,回收率达72.23%;纯化后的火棘籽油再经柱层析分离得到鲨烯,纯度达98.16%。     

亚油酸及共轭亚油酸异构体纯化技术优化

以红花籽油制备的亚油酸样品和共轭亚油酸样品为原料,采用溶剂低温结晶法和尿素包合法对共轭亚油酸与亚油酸进行分离纯化,结果表明,与溶剂结晶法相比,尿素包合法对共轭亚油酸和亚油酸有更好的纯化效果.正交实验得到的尿素包合法最佳工艺条件为:m(共轭亚油酸):m(尿素)=1:3,m(尿素):V(乙醇)=1:5,4℃放置24 h得到含量95.17%的共轭亚油酸;m(亚油酸样品):m(尿素)=1:3,m(尿素):V(乙醇)=1:5,-10 ℃放置24 h得到含量99.93%的亚油酸.     

尿素包合法富集红花油中亚油酸的工艺优化

尿素包合法分离提纯脂肪酸成本低,操作简单,纯度高,已被广泛使用。红花籽油经皂化水解、尿素包合富集亚油酸,通过正交试验得出尿素包合亚油酸的最佳工艺条件为:尿素甲醇比例3/10(M/V)、温度时间条件-18℃12h,5℃12h、尿素甲醇溶液与脂肪酸的比例100/10(V/M)。在此条件下,亚油酸得率可达85.67%,纯度达89.98%。     

华山松籽油亚油酸的富集纯化及降血脂活性研究

以华山松籽油为原料,通过皂化酸解得到混合脂肪酸,再通过尿素包合法富集纯化亚油酸,研究了包合温度、包合时间、混合脂肪酸与尿素质量比值、95%乙醇与尿素体积质量比值4个因素对亚油酸纯度和得率的影响。然后采用不同剂量的纯化亚油酸对高脂模型小鼠进行灌胃,研究其降血脂功能。通过单因素试验确定富集纯化亚油酸的最佳工艺条件为:包合温度-10℃,包合时间24 h,混合脂肪酸与尿素质量比值0.4,95%乙醇与尿素体积质量比值5。在最佳条件下,经一次尿素包合,得到的亚油酸纯度为80.57%。降血脂功能研究结果表明:由华山松籽油富集纯化得到的亚油酸具有降低高脂血症小鼠体重、肝脏重及肝脏指数、小鼠血清甘油三酯(TG)及总胆固醇(TC)水平,提高小鼠血清高密度脂蛋白胆固醇(HDL-C)水平,降低动脉硬化指数(AI)及低密度脂蛋白胆固醇(LDL-C)水平的功能。由华山松籽油富集纯化得到的亚油酸可降低高脂血症小鼠血脂水平,改善其因摄入过多脂质而导致的肝脏脂肪堆积和动脉粥样硬化。     

尿素包合法纯化红花籽油中亚油酸

本文介绍了以尿素包合法纯化红花籽油中亚油酸的方法。作者对多不饱和脂肪酸的制备及尿素包合法纯化其中亚油酸的工艺进行了研究，重点考察了溶液中尿素浓度（尿素／甲醇，w／v）、待富集混合物中亚油酸含量与尿素溶液的用量（w／v）之间的关系对富集效率的影响。结果表明，当尿素溶液浓度为1／5、尿素甲醇溶液用量与混合脂肪酸中亚油酸含量的比例为10．0，在-10℃保存24h后，所富集后亚油酸纯度可以提高到95．66％，回收率可以达到93．58％。     

尿素包合法纯化红花籽油工艺研究

介绍了以尿素包合法纯化红花籽油中亚油酸的方法.对多不饱和脂肪酸的制备及尿素包合法纯化其中亚油酸的工艺进行了研究,结果表明,尿素：甲醇浓度为0.3（w/v）、温度10℃、时间为24h、（尿素＋甲醇）：原料脂肪酸的质量比为1：1时,富集效果最好,纯化后脂肪酸的纯度和得率可分别达到93%和90%以上.     

脲包法富集高纯度红花油亚油酸甲酯的研究

以亚油酸含量 81 74 %的红花油为原料 ,采用先碱性醇解 ,后尿素包合的方法 ,从红花油中富集亚油酸。通过正交试验 ,确定了尿素一次包合法富集高纯度亚油酸甲酯的最佳工艺条件 :混合脂肪酸甲酯∶尿素∶甲醇为 1 0 4∶1∶4 (W/W /V) ,包合温度 - 10℃ ,包合时间 2 4h ,亚油酸甲酯得率 72 95 % ,纯度 99 2 7%。     

蛋白质水解度测定方法综述

对目前国内外常用的蛋白质水解度测定方法进行了综述，其中pH—state方法是通过滴定水解过程中释放的质子测定DH；OPA、TNBS及国内常用的水合茚三酮和甲醛等测定方法是利用游离氨基的反应测定DH。     

聚多元羧酸盐的合成及应用

研究了聚多元羧酸盐的合成方法及反应机理,将其应用于洗涤剂和PVC制品中分别代替三聚磷酸钠和邻苯二甲酸二丁酯,证明有良好效果。     

SEROLOGIC IDENTIFICATION OF SPECIES OF ORIGIN OF SAUSAGE MEATS

SUMMARY: A partially purified immunoglobulin G (lgG) solution prepared from the serum of species to be tested was heated to the specifications for sausages. The resulting supernatant fluid was decanted and the precipitate washed with saline and used to immunize rabbits. The supernatant fluid was used to sensitize tanned sheep red blood cells. The immune serum was rendered monospecific by absorptions with heterologous, heated lgG precipitates. A sample of monospecific immune serum was absorbed with a washed homogenate of sausage. Aliquots of the monospecific immune serum, both untreated and sausage absorbed, were tested with cells sensitized with the homologous heated lgG supematant fluid. A significant reduction of titer by sausage absorption indicated that the sausages contained the meat homologous to the immune serum.     

BASIS OF STABILITY OF AMINE SALTS OF LINOLEIC ACID

SUMMARY— The mechanism and generality of the known stabilization against autoxidation conferred on linoleic acid by certain basic amino acids, such as lysine and arginine, was investigated. Basic amino acids were the only class of compounds found to confer the effect. However, the smallest basic amino acid, 2,3-diaminopropionic acid, was not effective, nor was αβω-diaminc acid, 3,6-diaminohexanoic acid, although a simple isomer of lysine. The stabilization was observed only in the solid phase. Inclusion of sodium chloride in the solid matrix was deleterious to the effect. A large number of physical and chemical observations were made and correlated but it has not been possible to draw detailed conclusions about the mechanism of stabilization, nor can a detailed structure of the stabilized complex be suggested. The cause of the phenomenon appears to be closely associated with the physical arrangement of the ions in the crystal lattice.     

STABILITY OF AQUEOUS EMULSIONS OF THE ESSENTIAL OIL OF HOPS

Hop oil emulsions prepared from different varieties of hops have been found to exhibit enhanced physical stability on the addition of blends of the emulsifiers Span 20/Tween 80 or Span 60/Tween 60. Examination of the particle size and volume distributions of an emulsion by use of a Coulter Counter was found to be an excellent method of monitoring its stability. An indication as to the relative efficiency of emulsifiers can be obtained from Coulter Counter measurements on hop oil emulsions after storage for 4 days. The use of an ultracentrifuge provies a rapid means of testing emulsion stability and hence the effectiveness of emulsion stabilizers.     

矩阵乘积的行式,列式

给出了ｍ×ｍ矩阵与ｍ×ｎ矩阵的行（列）式的表达式．若Ａ＝ａ１１ａ１２…ａ１ｍａ２１ａ２２…ａ２ｍ……ａｍ１ａｍ２…ａｍｍＢ＝ｂ１１ｂ１２…ｂ１ｎｂ２１ｂ２２…ｂ２ｎ……ｂｍ１ｂｍ２…ｂｍｎ分别是ｍ×ｍ，ｍ×ｎ矩阵，则｜Ａ｜｜Ｂ｜＝｜ＡＢ｜＋∑ｉ１＜ｉ２＜…＜ｉｔｊ１＜ｊ２＜…＜ｊｔ１≤ｔ≤ｍｎ－ｔ≥ｍＮＢｉ１ｉ２…ｉｔｊ１ｊ２…ｊｔＮＡＢ１…ｍ（－１）ｓｔ＋１ｊｔ＋１…（－１）ｓｎｊｎ其中ｉ１，ｉ２，…，ｉｔ是１，２，…，ｍ中ｔ个数码；ｊ１，ｊ２，…，ｊｔ，ｊｔ＋１，…，ｊｎ是１，２，…，ｎ的一个排列；ｓｒ＝π（ｊ１，ｊ２，…，ｊｔ，ｊｒ）（ｒ＝１，２，…，ｎ）是排列ｊ１，ｊ２，…，ｊｔ，ｊｒ的反序数．     

百年风尚

一场流光溢彩、赏心悦目的展览,一段百年风尚演进的传奇旅程,一次东西方文化艺术的完美对话。2013年9月13日,“博萃臻艺一中西方珍宝艺术展”在辽宁省博物馆举行了隆重的开幕仪式,法兰西共和国驻华大使白林女士、辽宁省文物局局长丁辉先生、辽宁省博物馆馆长马宝杰先生、卡地亚全球总裁兼首席执行官邓阁仕先生、卡地亚区域行政总裁（北亚洲）陆慧全先生、卡地亚中国区首席执行官陆意斯先生、辽宁省文物店总经理张春鹰先生,以及众多文化界与文博界的贵宾齐聚一堂,共同见证了这场文化艺术盛事。     

EFFECTS OF TYPES OF FAT AND OF RATES AND TEMPERATURES OF COMMINUTION ON DISPERSION OF LIPIDS IN FRANKFURTERS

ABSTRACT— The effect of time, temperature and rpm of comminution of emulsions was determined on the dispersion of approximately 25% of beef fat, pork fat or cottonseed oil in frankfurters. The numbers of lipid particles 5 μ or less in diameter increased in frankfurters containing either beef or pork fat as comminution was continued to higher temperatures, with pork fat dispersed more thoroughly. Fat tended to separate from frankfurters containing beef fat in particles 200 μ or more in diameter. In contrast, no specific degree of dispersion of particles 5 μ or less in diameter consistently indicated emulsion stability, or its lack. Increased rpm during comminution produced an increased dispersion of beef or pork fat. Under the same conditions pork fat was dispersed more finely than beef fat. Dispersion of cottonseed oil produced finely dispersed particles beyond the resolution of light microscopy, as was confirmed by electron microscopy which showed a substantial number of particles to be less than 1 μ in diameter.     

基于复合运动理论推导求点的速度及加速度的球坐标法

本文基于点的复合运动理论,用球坐标法推导出点的速度及加速度的计算公式,进一步论证了理论力学中点的速度,加速度公式的正确性。     

山药水溶性多糖的提取及抗氧化性研究

研究山药水溶性多糖的提取及其抗氧化作用。方法是将小鼠分别口服给予山药水溶性多糖，每天1次，连续给药15d，取血测过氧化物酶（POD）活性，取血、肝、肾测超氧化物歧化酶（sOD）活性，脂质过氧化产物（MDA）含量。山药多糖物可显著提高POD活性及血、肝、肾的SOD活性，并减少血、肝、肾组织中MDA的含量。山药水溶性多糖有提高小鼠体内过氧化物酶、超氧化物歧化酶活性及减少脂质过氧化产物的抗氧化作用。