Abstract
A novel method combining electrophoretically mediated microanalysis methodology and partial filling technique was developed and validated for kinetic study of α-chymotrypsin with N-benzoyl-l-tyrosine ethyl ester (l-BTEE) as substrate. The in-line enzymatic reaction was performed in 20 mmol L−1 Tris with 5 mmol L−1 calcium chloride (pH 7.8), while 20 mmol L−1 Tris (pH 7.8) was used as a background electrolyte. A plug–plug injection sequence of incubation buffer, enzyme, substrate, and incubation buffer was applied due to the lower electrophoretic mobility of α-chymotrypsin than that of l-BTEE. The reaction was initiated by the application of 15 kV for 0.2 min. The voltage was turned off to increase the product amount (zero-potential amplification) and turned on again at a constant voltage of 18 kV to separate all the components. Incubation and subsequent analyte separation were carried out in a 37/30 cm (50 μm i.d.) fused-silica capillary at 25 °C. In the developed in-capillary α-chymotrypsin assay, the Michaelis–Menten constant (K m) and an inhibition and activation study were performed. The kinetic parameters are in accordance with that determined by a spectrophotometric method.
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References
Qiao Y, Kempen TV (1959) Biochem Physiol 37:1393
Levitsky VY, Lozano P, Iborra JL (1999) Biotechnol Bioeng 65:170
Soni S, Desai JD, Devi S (2000) Applied Polym Sci 77:2996
Hummel BCW (1959) Can J Bioch Physiol 37:1393
Fan Y, Scriba GK (2010) J Pharm Biomed Anal 53:1076
Papezová K, Nemec T, Chaloupková R, Glatz Z (2007) J Chromatogr A 1150:327
Zhang J, Hoogmartens J, Van Schepdael A (2010) Electrophoresis 31:65
Nováková S, Van Dyck S, Van Schepdael A, Hoogmartens J, Glatz Z (2004) J Chromatogr A 1032:173
Fan Y, Scriba GK (2010) Electrophoresis 31:3874
Van Dyck S, Van Schepdael A, Hoogmartens J (2001) Electrophoresis 22:1436
Jin Z, Chen R, Colonl A (1997) Anal Chem 69:1326
Harmon BJ, Lessong I, Regnier FE (1996) J Chromatogr A 726:193
Burke BJ, Regnier FE (2001) Electrophoresis 22:3744
Avila LZ, Whitesides GW (1993) J Org Chem 58:5508
Van Dyck S, Van Schepdael A, Hoogmartens J (2002) Electrophoresis 22:1436
Papezová K, Nemec T, Chaloupková R, Glatz Z (2007) J Chromatogr A 1150:327
Zhang LC, Hu K, Li XT, Zhao SL (2011) Chromatographia 73:583
Van Dyck S, Van Schepdael A, Hoogmartens J (2001) Electrophoresis 22:1436
Rassi ZE (1999) Electrophoresis 20:3134
Acknowledgments
The authors acknowledge support for this work by a project supported by the Scientific Research Foundation of the Higher Education Institutions of Jiangsu Province, China (No. 11KJB320020), Xuzhou Natural Science Foundation of China (No. XX10A052), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions and Xuzhou Medical College President Foundation of China (09KJZ13).
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Yang, D., Sun, S., Fu, C. et al. Kinetic Study of α-Chymotrypsin by Electrophoretically Mediated Microanalysis Combined with Partial Filling Technique. Chromatographia 75, 755–760 (2012). https://doi.org/10.1007/s10337-012-2250-4
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DOI: https://doi.org/10.1007/s10337-012-2250-4