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关键词： Green alternative solvent   n-Hexane   Cosmo-RS   Hansen parameters   Salmon fish   Lipid extraction  

摘要： There is a great interest in finding alternatives and green solvents in extraction processes to replace petroleum based solvents. In order to investigate these possibilities, computational methods, as Hansen solubility parameters (HSP) and conductor-like screening model for real solvent (COSMO-RS), were used in this work to predict the solvation power of a series of solvents in salmon fish lipids. Additionally, experimental studies were used to evaluate the performance in lipids extraction using 2-methyltetrahydrofurane, cyclopentyl methyl ether, dimethyl carbonate, isopropanol, ethanol, ethyl acetate, p-cymene and d-limonene compared with hexane. Lipid classes of extracts were obtained by using high performance thin-layer chromatography (HPTLC), whereas gas chromatography with a flame ionization detector (GC/FID) technique was employed to obtain fatty acid profiles. Some differences between theoretical and experimental results were observed, especially regarding the behavior of p-cymene and d-limonene, which separate from the predicted capability. Results obtained from HPTLC indicated that p-cymene and d-limonene extract triglycerides (TAGs) and diglycerides (DAGs) at levels of 73 and 19%, respectively, whereas the other studied extracts contain between 75 and 76% of TAGs and between 16 and 17% of DAGs. Fatty acid profiles, obtained by using GC-FID, indicated that saturated fatty acids (SFAs) between 19.5 and 19.9% of extracted oil, monounsaturated fatty acids (MUFAs) in the range between 43.5 and 44.9%, and PUFAs between 31.2 and 34.6% were extracted. p-Cymene and limonene extracts contained lower percentages than the other studied solvents of some PUFAs due probably to the fact that these unsaturated fatty acids are more susceptible to oxidative degradation than MUFAs. Ethyl acetate has been found to be the best alternative solvent to hexane for the extraction of salmon oil lipids.

关键词： 分析化学   中等专业学习   教材  

ISBN: (纸本)9787518408856

摘要： 本教材根据《中等职业学校食品生物工艺专业教学标准》编写而成。共有九部分，内容包括绪论、分析化学实验基础知识、滴定分析概论、酸碱滴定法、配位滴定法、氧化还原滴定法、沉淀滴定法、重量分析法、定量分析的一般步骤等模块。

关键词： 分析化学   化学实验   高等学校   教材   无机化学  

ISBN: (数字)9787564354152 ISBN: (纸本)9787564354152

摘要： 本书内容主要包括:化学实验的基本知识;化学实验基本操作,介绍加热与冷却、干燥、玻工等;提纯、制备及常数测定实验,介绍固液分离、物质理化常数的测定和无机化合物的制备;元素化学实验,介绍无机化合物的性质、鉴定与分离等;定量分析实验,介绍分析化学实验中定量部分的内容;仪器分析实验,介绍仪器分析的相关实验内容;设计实验,主要列出一些综合性的设计实验。

关键词： 分析化学   质量控制   准确度   管理  

摘要： 化学中的质量控制(qualityassuraneeofanalytiealhemistry)是一种统计和具体生产或测量系统相结合的工程实践。进行了一系列的质量分析控制研究,以实现质量审核质量达到比较经济、可靠、准确的目的。分析测试是一个复杂的系统,有很多的误差源。质量保证任务是在对所有误差的化学质量保证和质量控制分析的基础上,对所需水平的质量保证。

关键词： 教学改革   分析化学   实验教学  

摘要： 本文回顾了近几年来我国在分析化学实验教学改革中所做的工作,并针对分析化学课程内容和模式的改革以及课程改革评价进行了阐述,展望了了分析化学实验教学的改革趋势。

关键词： ANALYTICAL chemistry   OPEN source software   COMPUTER input-output equipment   ANALYTICAL chemists   SOFTWARE  

摘要： Isaac Newton famously observed that "if I have seen further it is by standing on the shoulders of giants." We propose that this sentiment is a powerful motivation for the "open-source" movement in scientific research, in which creators provide everything needed to replicate a given project online, as well as providing explicit permission for users to use, improve, and share it with others. Here, we write to introduce analytical chemists who are new to the open-source movement to best practices and concepts in this area and to survey the state of open source research in analytical chemistry. We conclude by considering two examples of open-source projects from our own research group, with the hope that a description of the process, motivations, and results will provide a convincing argument about the benefits that this movement brings to both creators and users.

关键词： 转型高校   分析化学   项目教学  

摘要： 在转型高校生物专业本科学生顶岗实习过程中,为确保人才培养的质量,落实"产教融合、以校为本,理实合一、工学结合"的高师转型发展的人才培养理念,引入项目化教学方法,能够实现人才培养的创新发展,加速学生融入社会的步伐。