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Barschak, A. G., Marchesan, C., Sitta, A., Deon, M., Giugliani, R., Wajner, M., and Vargas, C. R., (2008) Maple syrup urine disease in treated patients: Biochemical and oxidative stress profiles, Clinical Biochemistry, 41, 317–324.

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• TITLE: Application of quartz crystal nanobalance in conjunction with a net analyte signal based method for simultaneous determination of leucine, isoleucine and valine

  AUTHORS: Maryam Shojaei, Abdolreza Mirmohseni, Maryam Farbodi

  KEYWORDS: Quartz Crystal Nanobalance; Net Analyte Signal; Leucine; Isoleucine; Valine; HLA/GO Method

  JOURNAL NAME: Journal of Biomedical Science and Engineering, Vol.2 No.7, November 20, 2009

  ABSTRACT: The aim of the present investigation was to develop a biosensor for the detection of amino acids, Leucine, Isoleucine and Valine based on a quartz crystal nanobalance. leucine (Leu), isoleucine (Ile), and valine (Val) were selectively determined by quartz crystal nanobalance (QCN) sensor in conjunction with net analyte signal (NAS)-based method called HLA/GO. An orthogonal design was applied for the formation of calibration and prediction sets including Leu, Ile and Val compounds. The selection of the optimal time range involved the calculation of the net analyte sig-nal regression plot in any considered time window for each test sample. The searching of a region with maximum linearity of NAS regression plot (minimum error indicator) and minimum of PRESS value was carried out by applying a moving window strategy. On the base of obtained results, the differences on the adsorption profiles in the time range between 1 and 300 s were used to determine mixtures of compounds by HLA/GO method. The results showed that the method was successfully applied for the determina-tion of Leu, Ile and Val.