五水硫代硫酸钠制备及热效应测试综合性实验设计

以五水硫代硫酸钠的制备及其差热分析为例,将无机化合物的制备与物性测试有机结合起来设计了综合实验项目.实验结果:实验效果良好,能够满足学生实验对重现性的要求,综合训练学生实验技能,让学生在学习无机物制备的同时掌握通过热分析探讨物质性质的方法,进一步了解五水硫代硫酸钠的脱水过程,全面提升学生的创新实践能力.     

HPLC法测定注射用泮托拉唑钠的含量

目的:建立HPLC法测定注射用泮托拉唑钠含量的方法。方法:以乙腈-磷酸盐缓冲液(取磷酸氢二钠1.12g与磷酸二氢钠0.18g,加水溶解并稀释至1000ml,调节PH至7)(30:70)为流动相,检测波长为289nm;柱温:室温。结果:泮托拉唑钠在13μg/ml～208μg/ml浓度范围内,呈良好的线性关系(r=0.99999),平均回收率为100.24%,RSD=0.6%(n=9)。结论:方法简便、可靠、快速、可用于注射用泮托拉唑钠生产的质量控制。     

拟康氏木霉胞外多糖的分离纯化及其对黄瓜幼苗活性氧的诱导

拟康氏木霉胞外粗多糖经纯化得两个单一组分TPeps-1和TPeps-2．用0．25mg／mLTPeps-2处理黄瓜幼苗,处理叶在第一天就产生活性氧爆发,of含量是对照的117．5％;第二天处理中SOD活性达到峰值,为对照的135．5％;用黄瓜灰霉病菌接种黄瓜幼苗也产生了较强的诱导效应,处理叶第一天O2^-含量是对照的139．7％,第二天SOD活性为对照的141．9％;而且两组试验中未处理的系统叶中也存在较弱的诱导反应．结果说明TPeps-2能模拟病原入侵激发黄瓜叶片活性氧代谢途径．     

Electrochemical detection of hydrogen peroxide at a waxed graphite electrode modified with platinum-decorated carbon nanotubes

Platinum-decorated carbon nanotubes(CNT-Pt) were produced by the chemical reduction method. A novel modified electrode was fabricated by intercalated CNT-Pt in the surface of waxed graphite,which provided excellent electrocatalytic activity and selectivity for both oxidation and reduction of hydrogen peroxide. The current response of the modified electrode for hydrogen peroxide was very rapid and the detection limits in amperometry are 2.5×10-6 mol/L at reduction potential and 4.8×10-6 mol/L at oxidation po...     

内给氧治疗急性出血坏死性胰腺炎47例疗效观察

目的：观察内给氧治疗急性出血坏死性胰腺炎的效果。方法：对2003．4～2006．4月收治的47例经血、尿淀粉酶、B超、CT证实为急性出血坏死性胰腺炎患者，随机分为治疗组和对照组，治疗组给予注射用内给氧＋善德定（善宁）或施他宁、抗生素及基础性支持治疗；对照组予善德定（善宁）或施他宁加抗生素及基础性支持治疗。结果：治疗组腹痛缓解时间、淀粉酶降至正常时间及死亡率均明显少于对照组，差异有非常显著性（P〈0．01）。结论：内给氧配合基础性治疗对重症胰腺炎有较好疗效，具有费用低，实用性强的优点。     

检验乙醛的一种简便方法

本文报道利用亚硝基铁氰化钠检验乙醛。在室温条件下,在PH13～14的氢氧化钠介质中,选择1％亚硝基铁氰化钠溶液0.2～0.7ml与乙醛反应形成稳定紫色配合物。这种配合物的最大吸收在555nm处。方法简便,干扰少,选择性高。能用于有机物中乙醛的测定。     

过氧化氢的均相催化分解反应

通过实验说明了《基础化学》教材中所设计的过氧化氢的均相催化分解反应,在酸化后的H2O2溶液中加入K2Cr2O7溶液,发生的不是以K2Cr2O7为催化剂的均相催化分解反应。而应设计为在H2O2溶液中滴加K2Cr2O7溶液或碱性的K2CrO4溶液,发生的才是过氧化氢的均相催化分解反应。     

异丙醇常压氧化制备过氧化氢反应研究

异丙醇常压氧化制备过氧化氢,操作方便、反应条件温和耳安全可靠.用空气作氧化剂成本低廉.开发出一条新的过氧化氢合成路线,副产重要化工产品丙酮,同时为异丙醇的开发利用找到了新的途径.     

Multistage Extractive Reaction for Hydrogen Peroxide Production by Anthraquinone Process

The extractive reaction process of oxygen-working solution-water three-phase system for the production of hydrogen peroxide by the anthraquinone method was investigated in a sieve plate column of 50 mm in internal diameter. The oxidation reaction of anthrahydroquinone in the working solution with oxygen and the extraction of hydrogen peroxide from the working solution into aqueous phase occurred simultaneously in the countercurrent mode. The agitating effect caused by gaseous phase made the droplets of the dispersed phase become smaller, thus, increasing the liquid-liquid interfacial contact areas and resulting in the improvement of the mass transfer velocity. Results showed that the gas-agitation had a beneficial effect on the extraction of hydrogen peroxide from the working solution into the aqueous phase： the concentration of hydrogen peroxide in the raffinate decreased with the increase of the gaseous superficial velocities： and the concentration of H2O2 in the raffinate increased with the increase of the dispersed phase superficial velocity at the same superficial velocity of the gaseous phase. In the G-L-L extractive reaction process, with the increase of the gaseous superficial velocities, both the conversion of the anthrahydroquinone oxidation and the extraction efficiency of hydrogen peroxide first increased significantly, then increased gradually.     

自组装膜技术构筑双氧水的电化学酶传感器

利用自组装膜技术构筑H2O2的电化学生物传感器，以共价键合在电板表面的NB为媒介体，辣根过氧化物酶为生物敏感组分，具有灵敏度高、稳定性好、抗干扰能力强的特点。