Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 1176, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jchromb.2021.122756
Keywords
Dispersive micro-solid phase extraction; Gold nanoparticles; Saliva; Low-molecular-weight thiols; Capillary electrophoresis; Contactless conductivity detection
Funding
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201801]
- National Student Innovative Experimental Project of China [201910269083G]
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In this study, gold nanoparticles capped with Tween 20 were used for the purification and microextraction of main free thiols in saliva, showing acceptable sensitivity and recoveries. This method has the potential for clinical application in the sensitive detection of low-molecular-weight thiols.
Low-molecular-weight thiols are widely present in human fluids, and are regarded as a kind of potential broadspectrum evaluation indicators for some clinical diseases. In this work, gold nanoparticles capped with Tween 20 were used for purification and microextraction of the main free thiols (cysteine, homocysteine, glutathione and methionine) in saliva based on Au-S bond formation. Ultrasound further sped up the releasing of the target analytes, and the releasing time needed was only 10 min, and the required sample volume was only 40 & micro;L. The desorption solution could be directly injected for electrophoretic analysis without derivatization, and fieldamplified sample stacking of electrophoretic online enrichment technology further improved the detection sensitivity. The synergistic enrichment effect made the enrichment factors of four analytes reach 1119-2067 times. This developed method was applied for the analyses of saliva samples of healthy volunteers. Acceptable sensitivity (LODs: 0.15-1.5 ng mL-1) and recoveries (97.6-116%) were obtained in the saliva sample matrix. This proposed method provides an alternative for the sensitive detection of low-molecular-weight thiols in noninvasive body fluids, which has potential application prospect in the preliminary noninvasive diagnosis of diabetes, cardiovascular diseases, etc.
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