Simultaneous determination of low-molecular-weight organic acids and chlorinated acid herbicides in environmental water by a portable CE system with contactless conductivity detection

2007 ◽  
Vol 28 (10) ◽  
pp. 1530-1539 ◽  
Author(s):  
Yan Xu ◽  
Weilong Wang ◽  
Sam Fong Yau Li
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Simultaneous Determination ◽  
Environmental Water ◽  
Low Molecular Weight ◽  
Conductivity Detection ◽  
Contactless Conductivity Detection ◽  
Acid Herbicides

scholarly journals Simultaneous Determination of Human Serum Albumin and Low-Molecular-Weight Thiols after Derivatization with Monobromobimane

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3321
Author(s):  
Katarzyna Kurpet ◽  
Rafał Głowacki ◽  
Grażyna Chwatko
Keyword(s):  
Molecular Weight ◽  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Simultaneous Determination ◽  
Reversed Phase ◽  
Fluorescence Labeling ◽  
Detector Response ◽  
Low Molecular Weight

Biothiols are extremely powerful antioxidants that protect cells against the effects of oxidative stress. They are also considered relevant disease biomarkers, specifically risk factors for cardiovascular disease. In this paper, a new procedure for the simultaneous determination of human serum albumin and low-molecular-weight thiols in plasma is described. The method is based on the pre-column derivatization of analytes with a thiol-specific fluorescence labeling reagent, monobromobimane, followed by separation and quantification through reversed-phase high-performance liquid chromatography with fluorescence detection (excitation, 378 nm; emission, 492 nm). Prior to the derivatization step, the oxidized thiols are converted to their reduced forms by reductive cleavage with sodium borohydride. Linearity in the detector response for total thiols was observed in the following ranges: 1.76–30.0 mg mL−1 for human serum albumin, 0.29–5.0 nmol mL−1 for α-lipoic acid, 1.16–35 nmol mL−1 for glutathione, 9.83–450.0 nmol mL−1 for cysteine, 0.55–40.0 nmol mL−1 for homocysteine, 0.34–50.0 nmol mL−1 for N-acetyl-L-cysteine, and 1.45–45.0 nmol mL−1 for cysteinylglycine. Recovery values of 85.16–119.48% were recorded for all the analytes. The developed method is sensitive, repeatable, and linear within the expected ranges of total thiols. The devised procedure can be applied to plasma samples to monitor biochemical processes in various pathophysiological states.

Determination of low molecular weight organic acids in soil solution by HPLC

Talanta ◽  
1999 ◽  
Vol 48 (1) ◽  
pp. 173-179 ◽  
Author(s):  
P VANHEES ◽  
J DAHLEN ◽  
U LUNDSTROM ◽  
H BOREN ◽  
B ALLARD
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Soil Solution ◽  
Low Molecular Weight

Determination of phospholipid and fatty glyceride in liposome by RP-HPLC with capacitively coupled contactless conductivity detector

2018 ◽  
Vol 10 (41) ◽  
pp. 4978-4984 ◽  
Author(s):  
Xing Huang ◽  
Kaipeng Zhang ◽  
Yanli Tong ◽  
Yongsheng Zhong ◽  
Zuanguang Chen
Keyword(s):  
Simultaneous Determination ◽  
Conductivity Detection ◽  
Capacitively Coupled ◽  
Contactless Conductivity Detection ◽  
Rp Hplc

In this study, a gradient RP-HPLC with capacitively coupled contactless conductivity detection (RP-HPLC-C4D) method for simultaneous determination of phospholipid and fatty glyceride in liposome was developed.

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