“…Over the past few years, several analytical methods have been developed to quantify L-PA including high performance liquid chromatography with fluorescence detection (Kand'ar & Žáková, 2009;Wróbel & Wróbel, 1997), capillary electrophoresis (Mohammad, Fujinari, Okorodudu, & Petersen, 2000;Tagliaro et al, 1994), spectrophotometry (Parra, Mateos, Mata, & de Marí a, 1998), enzymatic method (Bazukyan, Hambardzumyan, Andreasyan, & Popov, 2008;Hummel, Schütte, & Kula, 1988), potentiometry and colorimetry (Pijanowska & Remiszewska, 2006), electrochemical method (Hu, Zhang, Zhang, Luo, & Yao, 2011), and flow-injection (Costin, Francis, & Lewis, 2003;Hanaoka, Lin, & Yamada, 2000;Hara, Toriyama, Ebuchi, & Imaki, 1985;MacDonald & Nieman, 1985;Zhou & Chen, 2002). Most of the above-mentioned methods have suffered from various drawbacks including poor sensitivity, poor detection limits, sample separation, and expensive instrumentation.…”