共查询到20条相似文献,搜索用时 187 毫秒
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比较峰面积归一化法与标准曲线法两种方法分析植物油中脂肪酸百分比含量的差异。利用气相色谱-质谱联用仪(GC-MS)检测10种市售食用植物油中的8种主要脂肪酸,峰面积归一化法和标准曲线法计算脂肪酸的百分比含量。结果表明,标准曲线法与峰面积归一化法相比,肉豆蔻酸、棕榈酸、十七烷酸、硬脂酸和棕榈油酸所占的百分比升高,而油酸、亚油酸和亚麻酸比例降低;饱和脂肪酸比例升高,不饱和脂肪酸百分比降低。利用峰面积归一化法计算植物油中脂肪酸百分比时,降低了饱和脂肪酸比例,升高了不饱和脂肪酸比例,可能对健康有潜在的不利影响。建议使用标准曲线法计算不同植物油中脂肪酸的百分比。 相似文献
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一、油脂氢化的意义及氢化反应机理 1.油脂氢化的意义油脂是人体三大营养要素之一,也是某些精细化工产品的原料。按联合国统计,1979年全世界总计生产起酥油287万吨、人造奶油704万吨,而该年总计食用植物油产量为3010万吨,故氢化油占总食用植物油的28%。在国 相似文献
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气相色谱法与麻油纯度试验法在芝麻油掺伪鉴定中的应用 总被引:3,自引:0,他引:3
用气相色谱法和麻油纯度试验法对芝麻油掺伪情况进行分析。用气相色谱法分析脂肪酸组成,测定植物油中的主要脂肪酸,来确定是何种油或掺入其它何种植物油;麻油纯度试验法用于定量。两者可结合起来使用。 相似文献
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含氨基酸侧链的有机硅高分子催化剂(ⅩⅧ):—聚γ—(甘—谷氨酰胺基)丙基硅氧烷钯催化剂的合成及加氢活性 总被引:2,自引:0,他引:2
合成了不同N/Pd摩尔比的聚γ-(甘-谷氨酰胺基)丙基硅氧烷钯催化剂,表征了它们的结构,加氢实验表明,这种催化剂有很高的催化活性,对环戊二烯氢化分两步完成,对1,5-己二烯氢化则同时进行,讨论了溶剂、N/Pd摩尔比对催化剂活性的影响。 相似文献
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A novel inorganic polymer, silica-supported polysulfoalumoxane, has been prepared and used as a support for preparing a silica-supported polysulfoalumoxane–platinum complex. It has been used as a catalyst for the hydrogenation of aromatics under mild conditions. The effects of several reaction parameters such as metal loading, temperature and solvents on the hydrogenation of methyl benzoate have been studied. The catalyst showed high activity and selectivity. 相似文献
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Yu. M. Mikhailov L. M. Kustov V. V. Aleshin A. L. Tarasov L. V. Zhemchugova 《Kinetics and Catalysis》2011,52(2):277-281
The hydrogenation of 1,3-pentadiene into pentenes over the commercial 0.5% Pd/Al2O3 catalyst and over a new catalyst containing 1.0% Pd and 3.7% Ag (μ-catalyst) has been investigated. The new catalyst has
been prepared via the flameless wave conversion of cyclotrimethylenetrinitramine in a porous composite. The catalytic properties
of the new composite in the hydrogenation reaction depend on the hydrogen/1,3-pentadiene ratio and on the catalyst activation
temperature. The reaction conditions for selective 1,3-pentadiene hydrogenation have been optimized. The pentenes yield as
a function of temperature passes through a maximum at any H2/C5H8 ratio between 1 and 2. The 2-pentene/1-pentene ratio in the reaction products increases as the temperature is raised. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(32):9509-9513
Hydrogenation of amides to amines is an important reaction, but the need for high temperatures and H2 pressures is a problem. Catalysts that are effective under mild reaction conditions, that is, lower than 30 bar H2 and 70 °C, have not yet been reported. Here, the mild hydrogenation of amides was achieved for the first time by using a Pt‐V bimetallic catalyst. Amide hydrogenation, at either 1 bar H2 at 70 °C or 5 bar H2 at room temperature was achieved using the bimetallic catalyst. The mild reaction conditions enable highly selective hydrogenation of various amides to the corresponding amines, while inhibiting arene hydrogenation. Catalyst characterization showed that the origin of the catalytic activity for the bimetallic catalyst is the oxophilic V‐decorated Pt nanoparticles, which are 2 nm in diameter. 相似文献
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(RCp)2TiCl2—Pr^iMgBr存在下二苯乙炔的选择性加氢 总被引:2,自引:0,他引:2
最近我们发现了在催化量(RCp)_2TjCl_2-Pr~iMgBr存在和常温常压下二苯乙炔的加氢反应。该反应以H_2为还原剂,经顺、反式二苯乙烯可定量地得到二苯乙烷。它比以格氏试剂为还原剂的钛氢化反应更具优越性。 相似文献
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Jieshan Qiu Hongzhe Zhang Xiuna Wang Hongmei Han Changhai Liang Can Li 《Reaction Kinetics and Catalysis Letters》2006,88(2):269-276
Summary Carbon nanotube supported Pd, Ru and Pd-Ru catalysts have been prepared and tested with the hydrogenation of cinnamaldehyde
as a probe reaction. It has been found that the cinnamaldehyde conversion and the selectivity towards the hydrogenation of
C=O bond over Pd-Ru/PCNT catalyst could reach 56.6% and 79.1%, respectively, at 120oC and 5.0 MPa, which is better than Pd/PCNT and Ru/PCNT catalysts under the same reaction conditions. It is assumed that the
better performance of Pd-Ru/PCNT catalyst for cinnamaldehyde hydrogenation may be due to the synergic effect of Pd and Ru
metals or the promoting effect of Ru metal. 相似文献
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SELECTIVE HYDROGENATION OF MALEIC ANHYDRIDE TO |?-BUTYROLACTONE USING HOMOGENEOUS Ru/PPh3 CATALYST SYSTEM 下载免费PDF全文
The hydrogenation of maleic anhydride (MA) using various homogeneous transition metal complex catalysts has been studied. It is revealed that RuCl3.3H2O is the most active catalyst and triphenylphosphineis the optimum ligand for the preparation of butyrolactone. The effects of catalyst concentration, mole ratio of triphenylphosphine to Ru, temperature and hydrogen pressure on the hydrogenation have been investigated. By changing reaction conditions, -butyolactone could be produced selectively. A possible reaction mechanism is proposed. 相似文献
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We have analyzed experimental kinetic data for nitro compound consumption, for the formation of the corresponding amino product, and for the accumulation of intermediate products and by-products in the hydrogenation of chlorine-containing aromatic nitro compounds. The reaction has been carried out under static conditions over a platinum catalyst on a porous support in the presence of pyridine. The effect of the admixture on different hydrogenation steps of a chlorine-containing aromatic nitro compound has been quantitatively interpreted. 相似文献