肽一种自然或人工的合成物，包括二个或二个以上氨基酸，通过一个氨基酸的酸基和另一个的羧基结合而成。
Any of various natural or synthetic compounds containing two or more amino acids linked by the carboxyl group of one amino acid and the amino group of another.
报道了利用毛细管电泳技术检测精制对苯二甲酸中的主要杂质4-羧基苯甲醛和对甲苯甲酸的方法。
This paper reports a novel, simple, rapid and accurate method for determination of 4-CBA and p-TOL in purified terephthalic acid by capillary electrophoresis.
邻苯二甲酸的两个羧基上的羟基会发生缩水反应，最终生成邻苯二甲酸酐。
The condensation reaction takes place between the two hydroxyl of phthalic acid, and the phthalic acid be converted into phthalic anhydride finally.
研究了聚对苯二甲酸丙二醇酯（PTT） ，PET ，CDP在不同温度和时间下的特性粘数和端羧基含量的变化。
The changes of intrinsic viscosity and end carboxyl group content with temperature and time were studied for poly(trimethylene terephthalate)(PTT), PET and CDP.
而二元酸酐酰化反应可改变氨基、羧基的比例，从而降低了明胶的等电点。
The reaction with dicarboxylic acid anhydrides results in an acid addition product, which alters the ratio of free basic to free acidic groups in gelatin, so as to lower the isoelectric point.
蒙脱土的存在还使缩聚过程中二甘醇(deg)基团及端羧基基团浓度上升。
It was also found that the contents of diethylene glycol (DEG) groups and the end-acid groups are increased during the polycondensation, due to the presence of nanoclay.
本章还建立了合成含羧基的二氢吡咯衍生物的MCR条件。
The MCR conditions are established for the synthesis of tetra-substituted dihydropyrroles with Carboxyl group.
本发明公开了一种化工技术领域的含磺酸盐基的二羧基二苯砜及其制备方法。
The invention discloses a dicarboxyl diphenyl sulfone containing sulfonate group belonging to the technical field of chemical industry and a preparation method thereof.
它的原料的重量组成包括：液体橡胶90- 99.8%，有机改性黏土0.2 - 10%，所述的液体橡胶为液体端羧基聚丁二烯橡胶。
The raw materials comprises (by weight) : liquid rubber 90-99.8 percent and organic modified clay 0.2-10 percent, wherein the liquid rubber is liquid carboxyl terminated polybutadiene rubber.
本发明提供的二羧基癸酸酰胺表面活性剂的结构式如上。
The inventive dicarboxyl capric amide surfactant has the structural formula as above.
红外光谱表明二氧化硅表面硅羟基与己二酸二甲酯酯化产物己二酸的羧基形成氢键。
The FTIR result verified that the hydroxyl groups on the surface of the resulting nano-SiO2 form hydrogen bondings with adipic acid generated by hydrolysis of dimethyl adipate during reaction.
所述的二乙三 胺五乙酸羧基活化酯或类似物具有以上结构。
The DTPA carboxyl active ester or the analog has the structure.
所述的二乙三 胺五乙酸羧基活化酯或类似物具有以上结构。
The DTPA carboxyl active ester or the analog has the structure.
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