## 1 Introduction  
Biogenic amines (BAs) are low-molecular-weight organic bases comprising an aliphatic (including methylamine, ethylamine, putrescine, and cadaverine), an aromatic (including 2-phenylethylamine and tyramine), or a heterocyclic (e.g., tryptamine and 5-hydrotryptoamine) structure, which exhibit important biological activities [1]. BAs are also classified as mono- or polyamines according to their amine content, which are mainly synthesized or degraded during cellular metabolism activities in animals, plants, and microorganisms. These reactions involve the conversion of amino acids to BAs after the removal of the carboxyl group using decarboxylase enzyme or the transamination of aldehydes and ketones using amino acid transaminases [2; 3].  
Meanwhile, the presence of BAs in food is crucial from the viewpoints of safety and quality, given their relation to toxic incidents. Various fermented, seasoned, or conserved foodstuffs (including cheese, wine, beer, and meat) may contain BAs, and their concentrations are reportedly considered as markers for freshness and hygiene during storage and food processing [4; 5; 6]. In addition, BAs are important compounds of bioorganic bodies and play important physiological roles. However, the excess intake of BAs can cause various symptoms, including headaches, heart palpitations, edema, hypotension, and nausea, among other symptoms [7]. BAs are not equally toxic, and histamine is the most toxic compound among the BAs. In addition, BAs have been reported to be precursor species during the formation of carcinogenic N-nitrous compounds [8].  
Several methods have been developed for the quantitative analysis of BAs, including gas chromatography [9; 10; 11], liquid chromatography [12; 13; 14], and capillary electrophoresis (CE) [15; 16; 17; 18] coupled with UV-Vis, fluorescence, and mass spectrometry. Gas chromatography and liquid chromatography are powerful methods, but they exhibit disadvantages, such as long analysis time,tedious sample pretreatment procedures, and consumption of large volume of organic solvents. Owing to the minimized consumption of sample and reagent, high speed and separation efficiency, CE is becoming an alternative analytical approach [19; 20; 21]. Different modes of CE, such as capillary zone electrophoresis [22; 23; 24], micellar electrokinetic chromatography (MEKC) [25; 26], and capillary electrochromatography [27] have been employed to analyze BAs in various samples. Among these modes, MEKC with high separation efficiency has become a powerful technique for the separation of neutral and ionic compounds in complicated mixtures [28]. With the advantages of high separation efficiency and resolution and short analysis time, MEKC was chosen for the simultaneous determination of BAs. Sodium dodecyl sulfate (SDS) is a typical surfactant added to the background electrolytes at a concentration greater than its critical micellar concentration (CMC). The basic principle of MEKC is based on the differential partitioning of analytes between the pseudo-stationary micellar phase and the mobile aqueous phase.  
In this study, a simple, cost-effective, and rapid method for the quantitative determination of nine analytes using MEKC is described. Several experimental parameters that affect the separation efficiency, including the concentration and pH of the phosphate buffer and SDS concentration, were investigated. The approach performance was evaluated in terms of its ability to obtain accurate and precise qualitative and quantitative data over a relevant concentration range. The approach was satisfactorily used to analyze BAs in wines.