Batch and fed-batch production of butyric acid by Clostridium butyricum ZJUCB

INTRODUCTION Butyric acid has several potential applications in industry. Its applications in the foodstuffs and beverage industries are widespread. It may be used as the pure acid in the dairy industry, or in the form of esters as a food additive to increase fruit fragrance. Furthermore, butyric acid could also have some important physiological functions. For example, butyric acid esters are the character-impact flavors in tropic fruits and dairy products (Centeno et al., 2002; Watson e…     

微生物发酵生产十二碳二元酸的研究

热带假丝酵母（Candida tropicalis）是长碳链二元酸发酵生产中的常用菌种,而热带假丝酵母突变株HP-2-48是一株高产DC12的优良生产菌株。本文对十二碳二元酸的发酵进行了研究,考察了青霉素钠盐、尿素、丙烯酸、pH值对菌体生长、产酸的影响并对其作用机制进行了讨论,并据此建立了长碳链二元酸新的发酵工艺。     

SYNTHESIS AND STRUCTURE OF A MIXED-LIGANDS COMPLEX [CU(R-LACT)(O-PHEN)(H_2O)]·4H_2O

A mixed-ligands complex with the formula of [Cu(R-lact)(o-phen)(H2O)]·4H2O was synthesized by the reaction of copper carbonate with racemic lactic acid(RS-H2lact), and then with o-phenanthroline(o-phen) in ethanol-water(95%) solution. One of the two obtained compounds was dark blue column single crystal and was characterized by elemental analysis, IR spectrum and X-ray single crystal diffraction. The crystal belongs to triclinic system with space group P1, a=7.2825(5), b=11.7322(8), c=12.1194(8), α=65.8280(10)°, β=84.2120(10)°,γ=75.3290(10)°, V=913.88(11)3, Z=2, Dc=1533kg·m-3, Mr=421.89, μ(Mo K\α)=1.240mm-1,λ =0.71073, the final R =0.0483 and ωR =0.1199 [I2σ(I)] for 3120 observed reflections,F(000)=438. The copper atom is five coordinated with the distorted square pyramid environment.The five coordinated atoms are two oxygen atoms of depronated hydroxyl group and carboxyl of H2 lact, two nitrogen atom of o-phen and one oxygen atom of water molecule.     

固体酸SO4^2-/SnO2催化合成邻苯二甲酸二异辛酯的性能研究

以邻苯二甲酸酐、正辛醇为原料,采用自制的固体酸SO42-/SnO2为催化剂,合成邻苯二甲酸二异辛酯（DI-OP）,通过实验分别考察浸泡硫酸浓度、颗粒度、活化温度、活化时间等因素对催化剂活性的影响.实验表明：在固体酸SO42-/SnO2催化DIOP的合成中,其最佳工艺操作条件是：浸泡硫酸浓度1.2 mol/L、颗粒度120目、活化温度525℃、活化时间4 h,其酯化产率可达96%以上.固体酸SO42-/SnO2作为该反应的催化剂具有催化活性高、寿命长、可多次重复使用、产物易纯化分离、且产品色泽浅等优点,可望代替传统浓硫酸作催化剂用于DIOP的合成.     

磺化苯酐的合成

本实验采用发烟硫酸磺化苯酐 ,磺化率随反应条件不同而改变 ,通过正交实验 ,找到了能够得到要求磺化率的反应条件 ,并对产品的性质进行了研究。该合成反应容易控制。     

獒肉与狗肉营养价值的测定与比较

对獒肉和狗肉中的蛋白质、氨基酸、脂肪、总糖、和脂肪酸几种生物大分子含量进行了初步分析.结果表明:獒肉中蛋白质含量15.53％,家狗肉蛋白质含量14.19%,獒的总脂肪含量30.50％,狗的脂肪含量20.31％.獒的总糖含量1.59％,狗的总糖含量1.43％,17种氨基酸中人体必需氨基酸含量均略高,其中赖氨酸的含量獒是狗的近三倍.脂肪酸含量均非常丰富,其中油酸含量达40％多.獒与狗的部分指标含量差异明显.     

Serum glycoconjugates and ceruloplasmin in cancer of uterine cervix

The present study was done to assess the levels of glycoconjugates and ceruloplasmin in sera of patients with cervical cancer. Serum hexoses, hexosamines, sialic acid and fucose are elevated in a variety of inflammatory and neoplastic conditions. All the glycoconjugates, except fucose were increased in serum of patients compared to controls. Also, hexoses and sialic acid levels were high in patients with later stages of cancer compared to patients with early stage disease (P=<0.0001, P=0.03). Serum ceruloplasmin was increased in patients with early stage cancer (51.5mg/dl) and with late stage cancer (61mg/dl) compared to controls (38mg/dl). The elevated glycoconjugates may be the result of inflammatory reaction associated with neoplasia, as serum ceruloplasmin (an acute phase reactant) is also increased in these patients.     

硫酸催化甲酯化气相色谱法测肥皂产品中的脂肪酸分布及总脂肪物含量

气相色谱法-FID检测器测定产品的脂肪酸分布及平均分子量。用硫酸催化甲酯化肥皂产品中的脂肪酸,红外光谱法定性监测甲酯化产物。采用正己烷提取并富集甲醇溶液中的反应产物。采用外标法定量。用标准加入法测得方法的回收率在93.4%～103.8%之间,相对标准偏差（n=6）在3.6%～5.1%之间。用气相色谱测试数据计算推导可以获得肥皂中的总脂肪物含量。     

本钢7500L/h废盐酸再生机组工艺与设备浅析

主要对本钢7500IMh废盐酸再生机组的生产工艺进行了叙述,并在工艺基础上对其机组的主要设备的结构特点及用途进行了介绍。