## 1 Introduction  
Belonging to the Xanthene class, Rhodamine B is a synthetic dye largely used in cosmetic, textile, pharmaceutical, and several other industries. Nevertheless, the potential health consequences on both humans and animals from its use have been proven, leading to its prohibition in the food industry [1].  
Several analytical methods have been optimized for the determination of Rhodamine B including chromatographic and electrophoretic techniques, spectroscopic, electrochemical, and fluorometric detection [2; 3; 4; 5; 6; 7; 8]. Each one of these methods has drawbacks for the determination of Rhodamine B in different matrices. Electrochemical detection is an important technique for the determination of Rhodamine B due to its simplicity, fast response, high sensitivity, and cheap instrumentation [9].  
Various preconcentration methods were also applied, such as cloud point extraction (CPE) [10], solid phase extraction (SPE) [11], and liquid-liquid extraction (LLE) [12]. The magnetic solid phase extraction (MSPE) technique provides various advantages as a sample preparation and preconcentration alternative: mainly, time preservation, high preconcentration factor, and adsorbent reusability [13]. Functioning with a lock/key system, molecularly imprinted polymers (MIPs) provide the specific and selective binding of the target molecule (template) [14]. They are considered as a synthetic equivalent to natural antibodies and antigens. The production procedure consists of polymerization in the presence of a crosslinking agent and a solvent, after forming a complex between the functional lock/key and the template molecule [14]. The target molecule is then removed, leaving specific compatible cavities. MIPs have been used in many areas due to their high stability, inexpensiveness, and simple preparation process, such as sensors, separation, and catalysis [15; 16].  
The screen-printing technique is a well-known approach to perform (bio)chemical sensors [17]. The screen-printed electrodes (SPEs) are very adaptable as they could be easily modified using different materials such as nanoparticles and polymers. Apart from that, SPEs are inexpensive, portable, and allow for the analysis of less than 50 \(\mu\)L leading to possible industrial use. Screen-printed carbon electrodes (SPCE) are widely used, especially in environmental and food fields [18].  
In the present work, a screening electrochemical method for the determination of Rhodamine B in foodstuffs has been successfully developed. A correspondent MIP was first prepared involving MWCNT and TiO\({}_{2}\) nanoparticles and used as modifying material for the SPCE. Then, the MSPE method was developed as well using MMWCNT-PS-DVB as an adsorbent. The sensitivity of the developed electrode has been compared with the non-modified SPCE and the TiO\({}_{2}\)-MWCNT-SPCE for determination of Rhodamine B. The results show that the developed electrode has high sensitivity in comparison with the non-modified SPCE and the TiO\({}_{2}\)-MWCNT-SPCE. The electrochemical performance of the developed method is also explained for the determination of Rhodamine B in food samples obtaining high sensitivity, good selectivity, and good stability.