亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Thermodynamic interpretation of the drift and noise of gradient baselines in reversed-phase liquid chromatography using mobile phase additives

化学 色谱法 口译(哲学) 相(物质) 高效液相色谱法 反相色谱法 噪音(视频) 有机化学 人工智能 计算机科学 图像(数学) 程序设计语言
作者
Fabrice Gritti
出处
期刊:Journal of Chromatography A [Elsevier BV]
卷期号:1633: 461605-461605 被引量:6
标识
DOI:10.1016/j.chroma.2020.461605
摘要

Abstract The drift and noise of acetonitrile-water gradient baselines (5-95%, v/v, 5 min linear gradient) in reversed phase liquid chromatography (RPLC) are recorded at a wavelength of 215 nm using 0.1% trifluoroacetic acid (TFA) as the mobile phase additive, a 4.6 mm  ×  150 mm 5 μm Symmetry-C18 RPLC column, and an Arc system (low-pressure gradient proportioning valve or GPV, pump with a stroke volume of either 66 or 132 μL, no mixer) as the LC instrument. These observations are predicted from solid-liquid adsorption thermodynamics which requires the measurement of the excess adsorption isotherm of acetonitrile from water onto the RPLC column and of the variation of the Henry’s constant of TFA as a function of the volume fraction of acetonitrile in the bulk mobile phase. The incomplete mixing of the acetonitrile and water packets delivered by the low-pressure GPV is represented by a sinusoidal perturbation of the programmed volume fraction of acetonitrile during the entire gradient. The variation of the TFA absorbance at 215 nm with increasing acetonitrile concentration is measured in order to transform TFA concentration into the observable absorbance unit. The drift and noise of the gradient baseline are calculated by solving numerically (Rouchon method) the equilibrium-dispersive (ED) mass balance equations of acetonitrile and TFA. The agreement between the calculated and observed gradient baselines is very good as the proposed model of chromatography accurately accounts for the displacement of TFA between stationary and mobile phases (early excess and late deficit of TFA concentration relative to 0.1%) and for the frequency (equal to the ratio of the applied flow rate to the stroke volume) and the amplitude of the periodic noise recorded during the gradient. From a practical viewpoint, the drift of the gradient baseline can be minimized by maximizing the ratio of the gradient volume to the hold-up volume ( > 10) and/or by minimizing the retention factor of the mobile phase additive in the water-rich eluent (k
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
26秒前
lingdu发布了新的文献求助10
32秒前
隐形曼青应助科研通管家采纳,获得10
34秒前
遍空应助科研通管家采纳,获得20
34秒前
orixero应助科研通管家采纳,获得10
34秒前
55秒前
yshj完成签到 ,获得积分10
1分钟前
ZYP完成签到,获得积分10
1分钟前
爆米花应助lin采纳,获得10
1分钟前
1分钟前
iso发布了新的文献求助10
2分钟前
小蘑菇应助iso采纳,获得10
2分钟前
2分钟前
iso完成签到,获得积分10
2分钟前
lingdu发布了新的文献求助10
2分钟前
科目三应助科研通管家采纳,获得10
2分钟前
科研通AI5应助科研通管家采纳,获得10
2分钟前
搜集达人应助lingdu采纳,获得10
2分钟前
3分钟前
lingdu发布了新的文献求助10
3分钟前
玉米完成签到,获得积分10
4分钟前
可爱的函函应助玉米采纳,获得10
4分钟前
lingdu发布了新的文献求助10
4分钟前
KINGAZX完成签到 ,获得积分10
4分钟前
街道办柏阿姨完成签到 ,获得积分10
4分钟前
5分钟前
洁净思枫发布了新的文献求助10
5分钟前
6分钟前
6分钟前
ffff完成签到 ,获得积分10
6分钟前
壹贰完成签到 ,获得积分10
6分钟前
6分钟前
6分钟前
胡萝卜完成签到,获得积分10
6分钟前
clearsky应助科研通管家采纳,获得10
6分钟前
852应助科研通管家采纳,获得10
6分钟前
量子星尘发布了新的文献求助10
6分钟前
7分钟前
7分钟前
拼搏的秋玲完成签到,获得积分20
7分钟前
高分求助中
(应助此贴封号)【重要!!请各用户(尤其是新用户)详细阅读】【科研通的精品贴汇总】 10000
Nuclear Fuel Behaviour under RIA Conditions 500
Sociologies et cosmopolitisme méthodologique 400
Why America Can't Retrench (And How it Might) 400
Another look at Archaeopteryx as the oldest bird 390
Parenchymal volume and functional recovery after clamped partial nephrectomy: potential discrepancies 300
Optimization and Learning via Stochastic Gradient Search 300
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 纳米技术 计算机科学 内科学 化学工程 复合材料 物理化学 基因 催化作用 遗传学 冶金 电极 光电子学
热门帖子
关注 科研通微信公众号,转发送积分 4682323
求助须知:如何正确求助?哪些是违规求助? 4057809
关于积分的说明 12545519
捐赠科研通 3753261
什么是DOI,文献DOI怎么找? 2072912
邀请新用户注册赠送积分活动 1101909
科研通“疑难数据库(出版商)”最低求助积分说明 981211