质谱仪

Chapter 11 gives a detailed account of the various forms of mass spectrometry and includes a discussion of its use in protein structure determination, an application unthought of only a few years ago.

第十一章详细讲述了各种形式的质谱仪，并讨论了它在蛋白质结构分析中的使用，仅在几年前才出现这种不成熟的应用。

Aniline compounds are used as raw material and reacted with anthranilic acid and then phenyl iodide as alkylating agents to give alkylating products followed by cyclizing with concentrated sulphuric acid to give a N-phenyl-acridone(or 3-ethoxyl-N-phenylacridone).The structure of intermediate and target compound are determined by IR and MS.

以苯胺类化合物为原料，先后以邻氯苯甲酸和碘苯为烷基化试剂进行了N 烷基化反应，再用浓硫酸使其环化制得N-苯基吖啶酮和3-乙氧基-N-苯基吖啶酮，并用红外光谱及质谱仪检测了各中间体及目标产物的结构。

In addition, high-resolution time-of-flight secondary ion mass spectrometry was used to study the chemical composition of various pyrite forms in the No.9 coal seam (St,d = 3.46%) from the Wuda Coalfield. These include bacteriogenic, framboidal, massive, cell-filling, fracture-filling, and nodular pyrites.

运用高分辨率飞行时间型二次离子质谱仪，研究了内蒙古乌达矿区高硫煤9煤层（ St，d=3.46%）中的菌落成因、莓球状、晶粒状、胞腔充填型、裂隙充填型、结核状黄铁矿的化学组成。

Epidemiological studies, clinical trials or both have examined the effects of fiber on carbohydrate metabolism, lipid metabolism, colon cancer, diverticular disease, constipation, weight reduction, and other conditions.

富含〓的底物在人体内将被氧化代谢为〓〓和水。通过气体同位素质谱仪测定一定时间内呼气中的〓〓比值变化，可以评价摄入的营养物质在体内吸收、代谢的情况。

Then the fiber was transferred to a 4 mL vial which was filled with 100 μL of trifluoroacetic anhydride and stood 30 sec for headspace extraction. Afterward the fiber was transferred again to another blank 4 mL vial and stood 10 min for on-fiber derivatization before the analysis with GC/MS. The absorption-time profiles for both furoic acid and creatinine were examined.

有关尿中肌酸酐的量测，首先亦使用65μm PDMS/DVB纤维，在电磁搅拌转速1200rpm下以直接样本接触方式吸附60秒后，将已吸附肌酸酐的纤维挪至装有100μL无水三氟醋酸的4mL样本瓶中顶空吸附30 sec，再将纤维挪至另一个空白的样本瓶并静置10min（以利衍生物trifluoroacetamide的生成），最后再以气相层析质谱仪进行分析。

The solid-phase microextraction technique was evaluated for the determination of furoic acid and creatinine in urine. For furoic acid, the alkaline hydrolysis step was first performed to hydrolyze the furoic acid-glycine conjugate to free furoic acid.

本研究利用固相微萃取(solid-phase microextraction， SPME)动与气相层析质谱仪之结合，建立尿中呋喃甲酸与肌酸酊的分析技术，以提供评估呋喃甲醛暴露之生物侦测工具。

The experience of gasless laparoscopic surgery using Home-made Abdominal-wall-take-up;2. A home-made capillary interface has been coupled with a high resolution orthogonal-injection time-of-flight mass spectrometer.

介绍了一种自制的毛细管真空接口，用于连接电喷雾离子源(electrospray ionization，ESI)与自制高分辨率垂直引入式飞行时间质谱仪，初步研究了该接口对仪器灵敏度的影响。

The chemical constituents of extracts of Tamarindus indica L were determined by GC-MS. The relative contents of constitutes were determined by area normalizing method. 48 compounds were identified, amounting to total mass fraction 98.5%. The main compounds were 5-methyl-2(3H)-furanone, diethyl succinate, furfural, hexadecanoic acid, linolenic acid, 5-methylfurfural, oleic acid, linoleic acid, etc.

并利用气相色谱仪-质谱仪对罗望子萃取物的化学组成进行了分析鉴定，并用面积归一化法测定了各种成分的质量分数，共鉴定了48种成分，占总质量分数为98.35%，其中主要成分为：5-甲基-2(3H)-呋喃酮、丁二酸二乙酯、糠醛、十六酸、亚麻酸、5-甲基糠醛、油酸、亚油酸等。

Sulfur compounds in the diesel were selectively derived into methylsulfonium salts by reacting with iodomethane in the presence of silver tetrafluoroborate, and characterized by positive-ion electrospray ionization fourier transform ion cyclotron resonance.

在四氟硼酸银的催化作用下，以碘甲烷对直馏柴油进行甲基衍生化反应，使其中的有机硫化物转变成极性较强的锍盐，再用电喷雾－傅立叶变换离子回旋共振质谱仪进行检测。

The aim of this work is to simultaneously identify the major impurities, it's concentration and optical isomers in MA samples. Gas chromatography/mass spectrometry with selected ion monitoring was employed after drugs were derivatized with--α-methoxy -α-phenylacetic acid.

本实验的目的，就是利用气相层析质谱仪配合化学对掌性衍生剂--α-methoxy-α- phenylacetic acid，以选择性离子侦测模式来进行分析，检测甲基安非他命中所残留的麻黄素与伪麻黄素的含量与旋光性。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失