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

✍ Scribed by Dezhong Liu; Yongzhong Lai; Lihua Nie; Shouzhuo Yao

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 576 KB
• Volume: 313
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00234-q

✦ Synopsis

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. lop5 M, the recovery is 100.4%, the relative standard deviation is 3.32% (n = 5) and the frequency shift is linear up to 8 10e4 M; in aqueous medium, the above values are 2.0 10-j M, 99.1%, 3.01% (n = 6) and 1.1 . 10m3 M, respectively. The frequencimetric titration method is also described and the lowest titratable concentration of L-glutamic acid is 7.0 . 10e5 M. The detecting results for tablet samples show good agreement with the values determined by the pharmaceutical method.