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盐酸介质中脱氢松香基咪唑啉缓蚀剂对Q235钢缓蚀性研究 总被引:16,自引:3,他引:16
利用静态失重法测定了脱氢松香基咪唑啉系缓蚀剂在盐酸介质中Q235碳钢的缓蚀速度和腐蚀效率。研究Q235钢在盐酸介质中的腐蚀动力学特征,求出了腐蚀速度方程及相关动力学参数。结果表明,作为一种吸附型有机缓蚀剂,脱氢松香基咪唑啉在盐酸中对Q235钢具有较强的缓蚀能力,且缓蚀效率随温度升高而增大。 相似文献
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研究了2种不同组成(2Li NH2-1.1Mg H2和Mg(NH2)2-2.2Li H)的Li-Mg-N-H储氢材料系统储氢性能,通过P-C-T曲线以及脱氢反应动力学的测定,发现这2种组成的样品脱氢产物均为Li2Mg(NH)2,其在200℃以上具有良好的可逆性,可逆储氢量可达4.6%(质量分数)以上;2种组成的系统不同仅在于前者多余Mg H2而后者多余Li H,其对系统脱氢反应的热力学性质如焓变、熵变以及自由能改变不大,但多余Mg H2的样品较多余Li H的样品,系统脱氢反应的动力学较快,具有较低的活化能。 相似文献
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Katarzyna Sutor-
wiey Micha Antonik Justyna Proszek Boris Nemzer Zbigniew Pietrzkowski ukasz Popenda Tomasz
wiergosz Sawomir Wybraniec 《International journal of molecular sciences》2022,23(3)
Betacyanins are a group of water-soluble red-violet compounds containing nitrogen in their structure. These are biosynthesized in red beetroot (Beta vulgaris L.), a widely consumed vegetable that contains significant amounts of nutritious and bioactive compounds which are also found in dietary supplements. This contribution presents results of betacyanin thermal oxidation (resulting in dehydrogenation) interrelated with decarboxylation in selected acetate/phosphate buffers at pH 3–8 and at 85 °C, which may be of particular significance for formulation and performance of foods. Most of the reaction products were detected at the highest concentrations in the acidic solutions (pH 3–4). The main dehydrogenation reaction pathways were monitored by LC-DAD-MS/MS and were associated with decarboxylation of the principal extract pigments, betanin/isobetanin and neobetanin, at carbon positions C-2 and C-17. Additional reactions are accompanied by the 2,15-decarboxylation processes at different dehydrogenation levels with 15-decarboxy-betanin and 2,15-bidecarboxy-betanin, structurally elucidated by NMR analysis, as the distinct indicators of this route type. For other novel pigments detected, 2,15-bidecarboxy-xanbetanin, 2,15-bidecarboxy-xanneobetanin and 2,15,17-tridecarboxy-neobetanin, additional high resolution mass spectrometric analyses were performed and confirmed their molecular formulas. 相似文献
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建立经松香脱毛处理的肉鸭表皮组织中残留脱氢枞酸的固相萃取-高效液相色谱检测方法。肉鸭表皮组织中的脱氢枞酸用乙腈提取,经C18固相萃取小柱净化,以0.003 mol/L磷酸溶液-甲醇(13∶87,v/v)为流动相,采用反相C18(250 mm×4.6 mm,5 μm)色谱柱分离,以紫外检测器(检测波长212 nm)进行检测。结果表明:该方法检测脱氢枞酸线性范围为0.1~10 mg/L,检测限为0.10 μg/g,定量限为0.33 μg/g。在低中高3 个添加量范围内回收率为80.8%~91.8%。实际样品分析显示,肉鸭表皮中脱氢枞酸含量最高达10.06 μg/g。所建立的分析方法简便快捷、具有较好的灵敏度和可靠性,可用于肉鸭表皮组织中脱氢枞酸残留量的分析。 相似文献
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采用液相色谱-串联质谱法对畜禽表皮组织中的松香酸和脱氢松香酸含量进行检测。样品中的松香酸和脱氢松香酸用乙腈提取,经HLB固相萃取柱净化,采用液相色谱-串联质谱进行检测。色谱柱:反相C18柱(100 mm×2.1 mm,2 μm);流动相:0.1%甲酸溶液和0.1%甲酸-甲醇溶液(10∶90,V/V);流速:0.3 mL/min;质谱分析采用电喷雾电离正离子模式检测,扫描方式为多反应监测。结果表明:松香酸线性范围为2.0~100 μg/L,检出限为1.1 μg/kg,定量限为3.6 μg/kg;脱氢松香酸线性范围为5.0~250 μg/L,检出限为3.9 μg/kg,定量限为13 μg/kg。在5.0~200 μg/kg添加量范围内松香酸和脱氢松香酸的回收率为81.7%~93.7%,相对标准偏差均在12%以内。方法用于实际样品分析,多个畜禽表皮样品中检出松香酸及脱氢松香酸,采用松香甘油酯进行脱毛的鸭皮中也检出了一定含量的松香酸及脱氢松香酸。本实验建立的分析方法简便快捷,具有较好的灵敏度和可靠性,可用于畜禽表皮组织中松香酸和脱氢松香酸的定量确证分析。 相似文献
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