Human serum albumin adsorption study on 62-MHz miniaturized quartz gravimetric sensors

Ping Kao, Ashish Patwardhan, David Allara, Srinivas Tadigadapa

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

We have designed and fabricated 25-μm-thick quartz resonators operating at a fundamental resonance frequency of ∼62 MHz. The results show a substantial increase in the mass sensitivity compared to single monolithic commercial resonators operating at lower frequencies in the ∼5-10-MHz range. The overall performance of the micromachined resonators is demonstrated for the example of human serum albumin protein adsorption from aqueous buffer solutions onto gold electrodes functionalized with self-assembled monolayers. The results show a saturation adsorption frequency change of 6.8 kHz as opposed to 40 Hz for a commercial ∼5-MHz sensor under identical loading conditions. From the analysis of the adsorption isotherm, the equilibrium adsorption constant of the adsorption of the protein layer was found to be K = 8.03 × 10 ∧6 M∧-1, which is in agreement with the values reported in the literature. The high sensitivity of the miniaturized QCM devices can be a significant advantage in both vapor and solution adsorption analyses.

Original languageEnglish (US)
Pages (from-to)5930-5936
Number of pages7
JournalAnalytical chemistry
Volume80
Issue number15
DOIs
StatePublished - Aug 1 2008

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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