不同方法提取黄花鱼中脂肪酸的研究

分别采用Bligh-Dyer提取法和Soxhlet提取法对黄花鱼的脂肪油进行提取,甲酯化后利用气相色谱-质谱联用仪进行分析测定,并加以比较．结果表明：采用Bligh-Dyer提取法检出20种脂肪酸,采用Soxhlet提取法检出17种脂肪酸,Blish-Dyer提取法的脂肪油提取率较高,并且多不饱和脂肪酸的提取好于Soxhlet提取法．     

Students’ Learning with the Connected Chemistry (CC1) Curriculum: Navigating the Complexities of the Particulate World

The focus of this study is students’ learning with a Connected Chemistry unit, CC1 (denotes Connected Chemistry, chapter 1), a computer-based environment for learning the topics of gas laws and kinetic molecular theory in chemistry (Levy and Wilensky 2009). An investigation was conducted into high-school students’ learning with Connected Chemistry, based on a conceptual framework that highlights several forms of access to understanding the system (submicro, macro, mathematical, experiential) and bidirectional transitions among these forms, anchored at the common and experienced level, the macro-level. Results show a strong effect size for embedded assessment and a medium effect size regarding pre-post-test questionnaires. Stronger effects are seen for understanding the submicroscopic level and bridging between it and the macroscopic level. More than half the students succeeded in constructing the equations describing the gas laws. Significant shifts were found in students’ epistemologies of models: understanding models as representations rather than replicas of reality and as providing multiple perspectives. Students’ learning is discussed with respect to the conceptual framework and the benefits of assessment of learning using a fine-tuned profile and further directions for research are proposed. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.

高炉炉顶煤气管连接方式的比较

比较了高炉炉顶煤气管三岔管式连接和球式连接的特点,阐明了球式连接的实用性.     

诱导效应指数与脂肪族化合物的气相质子亲合能

给出了烷基诱导效应指数,和脂肪族化合物分子RX中亲合原子X所带电荷qx与RX的气相质子亲合能PA的关系式,并对多种脂肪胺、醇、醚的气相质子亲合能进行了计算,计算值和实验值的偏差均在实验误差范围内．     

头孢氨苄甲氧苄啶颗粒含量测定方法研究

目的：分析测定头孢氨苄甲氧苄啶颗粒的含量。方法：利用高效液相色谱法。结果：该方法在100ug／ml-500ug/ml范围内头孢氨苄峰面积与浓度呈良好的线性关系,线性方程为Y=2．0486E-4X＋3．6801E—1（r=0．999）。在20ug／ml-100ug／ml范围内甲氧苄啶峰面积与浓度呈良好的线性关系,线性方程为Y=5．2164E-5X＋1．3842（r=0．9999）,回收率为99．6％、99．7％。结论：方法简便,快速,准确,适用于该产品质量控制。     

HPLC法测定乳酸卡德沙星的含量

目的：用高效液相色谱法测定乳酸卡德沙星的含量：方法：用十八烷基键合硅胶为填充剂;以0．0lm01／1柠檬酸溶液（用三乙胺调节PH值至5．0）-乙腈-甲醇（84：16：10）为流动相,检测波长为327nm,流速为1．0ml／min：结果：该方法在20ug／ml～60ug／ml范围内峰面积与浓度呈良好的线性关系,线性方程为Y=2．2864E-5X＋1．9273E-3（r=0．9999）,回收率为99．1％,重复性实验RSD=0．024％,n=5。结论：方法简便,快速,准确,适用于该产品质量控制。     

世界油气地缘竞争发展新趋势及中国的突围战略

随着大国围绕油气资源和通道竞争的日益激烈,世界油气地缘竞争也逐渐呈现出海陆角逐均势发展、供求关系多元化和油气合作区域化的新趋势.文章分析了中国石油供应安全面临的主要地缘政治风险.提出中国在拓展海外油气供应渠道的过程中,应把握"有限扩张"原则,在全球的能源竞争格局和区域能源竞合大势中"避风就势.联合抗衡".这些策略将有助于中国在世界油气地缘封锁中成功突围和实现油气供应多元化.     

由《色谱》的办刊实践看学术期刊的品牌运作

以<色谱>为例,探讨学术期刊如何通过品牌运作达到提高期刊的学术影响力和社会影响力、扩大期刊的品牌影响力、增强期刊的品牌盈利能力的目的.     

用同位素稀释的气相色谱/高分辨质谱联用测定中国珠江流域鱼体中氯化二苯并二噁英和氧化二苯并呋喃

Objective:PCDD/Fs level in 22 fish samples was investigated in Pearl river Delta area in order that the PCDD/Fs pollution level in common fish can be evaluated. Methods: Dibenzo-p-Dioxins and Dibenzo-Furans was extracted from the sample by Soxhlet extraction, concentrated then purified by column chromatography, carbon column enrichment,. Confirmation and quantitative analysis at ppt(pg/g) level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID). Certified reference material using Proficiency test sample fish muscle test material 0613 that was obtained from Central Science Laboratory(CSL) in Britain. Results: The average of concentration in wet weight is 1.261 ng/kg,, the average total WHO-TEQ for 22 samples is 0.246ng/kg wet weight. Generally, OCDD, 2,3,7,8-TCDF,1,2,3,4,6,7,8-HpCDD was the main contributors to the total 17 PCDD/Fs detected, average account for 21%,16%,14%, respectively. While 1,2,3,7,8-PeCDD, 2,3,4,7,8-PeCDF, 2,3,7,8-TCDD were main contributors to the total WHO-TEQ, account for 40%,27%,13% respectively. The total TEQ for 22 fishes ranged from 0.03ng/kg wet weight to 0.878 ng/kg wet weight. Conclusions: PCDD/Fs level was largely different from sample to sample depending on the sample kinds. The level in the Pearl river Delta area fish samples is not distinct comparing with other countries, but some kind fish level should be paid more attention on it since its higher level. The relationship between source of PCDD/Fs and PCDD/Fs level in fish will be studied deeply in the future.