保留时间

高效液相色谱中pH对参与质子反应的物质保留时间的影响

The Effect of pH Value on Retention Time in High performance Liquid Chromatograpy of the Substances Participating in Protonic Reaction

结论ICU患者气管导管保留时间和机械通气时间过长会使呼吸道感染率增加；

Conclusion Longer retention time of tracheal catheter and mechanical ventilation time can increase respiratory tract infection .

类胡萝卜素亦采用线性梯度洗脱，以乙酸乙酯作为A相，B相为乙腈-水（体积比9∶1）。保留时间、相对保留时间、光谱法、加标定性，内标法定量。

Carotenoids were separated by linear gradient elution using ethyl acetate and water-acetonitrile ( 1:9 , V / V ) as mobile phase .

硬盘是PC系统中数据容量最大，保留时间最长的存储媒质。

As the primary computer storage medium , the hard disk has the largest capacity and the longest retention time .

结果秦皮甲素的保留时间为（3.620±0.05）min；

The flow rate was 1 ml · min-1 . Results The retention time of aesculin was ( 3.620 ± 0.05 ) min ;

粉体HPLC图谱显示，细粉和超细微粉在相同的保留时间有相同的吸收峰，只是峰值有差别。

The HPLC results show that two kinds of powder have the similar absorb peak in the same reserve time , but peak magnitude is different .

保留时间、灌肠液外溢、心悸、腹痛、排便感强烈，两组之间比较有统计学意义（P0.05）。

Retention time , enema liquid spills , palpitations , abdominal pain , defecation hematochezia strong statistical significance between the comparison , two significant differences exist .

利用保留时间、UV光谱和质谱在没有任何标样的情况下可以确认泛醌和甲基萘醌的成分。

The compositions of ubiquinone and menaquinone were determined directly using combined information of retention time , UV spectrum and mass spectrum without any standard samples .

结果：MMC与血清及房水中的蛋白质有良好的分离，保留时间为5.6min。

Results : MMC and protein in biofluid were well separated , the retention time of MMC was 5.6 min.

采用保留时间、Br同位素规则、质谱特征离子、谱库检索等4种方式相结合进行定性，避免了假阳性及漏检的情况，结果更加准确可靠。

Four qualitative methods of retention time , isotopic rule of bromine , characteristic ion and standard library searching were used .

运用此程序可在CRT屏幕上绘制色谱图，在各色谱峰峰顶自动打印保留时间。

Using the program chromatogram can be drawn in CRT screen and the screen displays retention time in every top peak .

样品指纹图谱相对保留时间的RSD小于0.5%。

The RSD of relative retention time of common peaks in the fingerprints of six samples were less than 0.5 % .

SCOT柱色谱峰保留时间与半峰宽间关系的理论探讨

A Theoretical Approach to the Correlation of Retention Time with Peak Half-Width for SCOT Column

根据色谱指纹图谱各个谱峰的相对保留时间值α和相对面积Sr对色谱指纹图谱进行分析对比研究，建立一个快速、简易鉴别田基黄样品的色谱指纹图谱分析方法。

It established a chromatographic fingerprint method for fast and simple identification of Hypericum japonicum Thumb based on the relative retention time and relative peak area .

结论静脉留置针保留时间最佳为96h左右。

Conclusion The optimal indwelling time of intravenous catheter system was about 96 h.

NFR及IS的色谱保留时间（tR）分别为2.3和2.2min。

The chromatographic retention times were 2.3 and 2.2 min for NFR and IS , respectively .

进行精密度和重现性实验，各共有峰相对峰面积和相对保留时间的RSD均小于5%。

This proposed method demonstrated good stability and reproducibility with RSD less than 5 % for both the relative retention time and the relative areas .

气相色谱保留时间为8.06min的峰对应的质谱图经数据库分析可能是HMF。

The MS of retention time of 8.06 min on GC is matched with reference standard HMF .

anacron在/var/spool/anacron中保留时间戳文件，记录作业运行的时间。

Anacron keeps timestamp files in / var / spool / anacron to record when jobs are run .

在选定的HPLC检测条件下，咪鲜胺的保留时间为5.384min，最小检出量为：3.5×10-10g；

Under HPLC conditions , prochloraz retain time was 5.384 min and the minimal limit of assay was 3.5 × 10-10 g.

探讨了在孔径为300nm的硅胶聚合物键合相上，流动相的pH值及盐浓度对蛋白质保留时间的影响。

The effect of salt concentration and pH value of the eluent on the retention of proteins on 300 nm silica-based polymer-bonded phase is also discussed .

结果表明：各种氨基酸的保留时间（Rt）、相对峰面积（Ax/AI）的RSD均较满意，回收率为93.21%~114.24%；

The results showed that the RSD for remaining time and A_x / A_I of amino acids was satisfied , and the recoveries ranged from 93.21 % to 114.24 % .

在柱温80±0.1℃、汽化温度110℃和氢气流速50mL/min下，测定乙醇与正己烷的保留时间，并由此计算出样品的亲水亲油平衡（HLB）值。

The retention time of ethanol / hexane was determined in the column , then the HLB amount of nonionic emulsifier was calculated .

方法改进高效液相含量分析方法，得到相对保留时间约为4（Rt≈22min）的杂质并进行液质分析。

Methods Improved HPLC Assay method , performed HPLC-MS analysis on impurity of RRT ≈ 4 ( Rt ≈ 22min ) .

本文阐述了采用保留时间锁定（RTL）和谱图Deconvolution技术，建立了一种能够筛查567种农药和可疑内分泌干扰物的简单的GC/MS分析方法。

The essay talked about the RTL and Deconvolution technology and set up a simple GC / MS analysis method that can filter 567 kinds of pesticide and suspicious endocrine interference .

研究了冲洗剂中有机溶剂异丙醇的浓度、离子对酸（TFA）浓度对蛋白质保留时间的影响。

The influence of concentration of organic modifier ( 2 propanol ) and ion pairing acid ( TFA ) on the protein retention time was examined .

结果RP-HPLC法测定乙醚萃取的血浆中冬凌草甲素保留时间稳定，标准曲线线性良好，结果准确、可靠。

Results To determine the Oridonin extracted from diethyl ether of plasma by RP-HPLC method , the retention time was stable , the linear curve fitted well , and the results were accurate and reliable .

在稳定性、精密度和重现性考察中，各共有峰的相对保留时间（RSD）均小于3%，表明该方法稳定、可行。

The relative retention time ( RSD ) of each peak was less than 3 % in the stability , precision and reproducibility study , which revealed that this method was stable and feasible .

结果：5Fu和MMC与房水中的蛋白质有良好的分离，保留时间分别为3.8min和5.6min。

RESULTS 5-Fu , MMC and protein in biofluid was well separated , the retention time of 5 - Fu and MMC were 3.8 min and 5.6 min , respectively .

采用GC-MS及标准样保留时间对比等方法对环己烷氧化产物进行了定性分析，新定性了己内酯、甲酸环己酯、环己基过氧化氢等。

The products were qualitatively analyzed by using GC-MS and comparing the retention time of the standard samples with the products . And cyclohexyl hydroperoxide ,ε - caprolactone , cyclohexyl formate were qualitatively analyzed at first . 3 .