Rapid detection of l-glutamic acid using a series-electrode piezoelectric quartz crystal sensor

Two methods are described for the determination of l-glutamic acid using a series-electrode piezoelectric quartz crystal sensor. The effect of formaldehyde solution on the frequency shift is discussed. For the calibration curve method, in formaldehyde medium, the detection limit is 3.8 · 10 −5 M, th...

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Bibliographic Details
Published in:Analytica chimica acta 1995-09, Vol.313 (3), p.229-236
Main Authors: Liu, Dezhong, Lai, Yongzhong, Nie, Lihua, Yao, Shouzhuo
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical and thermal methods
Chemistry
Exact sciences and technology
Formaldehyde
Glutamic acid
Pharmaceuticals
Piezoelectric sensors
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Summary:Two methods are described for the determination of l-glutamic acid using a series-electrode piezoelectric quartz crystal sensor. The effect of formaldehyde solution on the frequency shift is discussed. For the calibration curve method, in formaldehyde medium, the detection limit is 3.8 · 10 −5 M, the recovery is 100.4%, the relative standard deviation is 3.32% ( n = 5) and the frequency shift is linear up to 8 · 10 −4 M; in aqueous medium, the above values are 2.0 · 10 −5 M, 99.1%, 3.01% ( n = 6) and 1.1 · 10 −3 M, respectively. The frequencimetric titration method is also described and the lowest titratable concentration of l-glutamic acid is 7.0 · 10 −5 M. The detecting results for tablet samples show good agreement with the values determined by the pharmaceutical method.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(95)00234-Q