Simultaneous preconcentration and determination of sulfonamide antibiotics in milk and yoghurt by dynamic pH junction focusing coupled with capillary electrophoresis was written by Semail, Nadhiratul-Farihin;Abdul Keyon, Aemi Syazwani;Saad, Bahruddin;Kamaruzaman, Sazlinda;Mohamad Zain, Nur Nadhirah;Lim, Vuanghao;Miskam, Mazidatulakmam;Wan Abdullah, Wan Nazwanie;Yahaya, Noorfatimah;Chen, David D. Y.. And the article was included in Talanta in 2022.Formula: C11H12N4O3S This article mentions the following:
A dynamic pH junction was used in capillary electrophoresis (CE-DAD) to online preconc., sep., and determine trace amounts of sulfonamide antibiotics (SAs) in milk and yoghurt samples in this study. A sample matrix with 0.15% acetic acid and 10% methanol (MeOH) at a pH of 4.0, and a background electrolyte (BGE) that contained 35 mM sodium citrate with 10% MeOH at a pH of 8.5, and an acidic barrage of 0.4% acetic acid with 10% MeOH at a pH of 2.5 were utilized to achieve a stacking effect for SAs through a dynamic pH junction. Under optimized conditions, the proposed preconcentration method showed good linearity (30-500 ng/mL, r2 ≥ 0.9940), low limits of detection (LODs) of 4.1-6.3 ng/mL, and acceptable analytes recovery (81.2-106.9%) with relative standard deviations (RSDs) within 5.3-13.7 (n = 9). The limits of quantification (LOQs) were below the maximum residue limit approved by the European Union (EU) in this type of matrixes. Sensitivity enhancement factors of up to 129 were reached with the optimized dynamic pH junction using CE with a diode array detector (DAD). The method was used to determine SAs in fresh milk, low-fat milk, full-cream milk, and yoghurt samples. In the experiment, the researchers used many compounds, for example, 4-Amino-N-(6-methoxypyrimidin-4-yl)benzenesulfonamide (cas: 1220-83-3Formula: C11H12N4O3S).
4-Amino-N-(6-methoxypyrimidin-4-yl)benzenesulfonamide (cas: 1220-83-3) belongs to pyrimidine derivatives. Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. Pyrimidine derivatives also play an important role in drug development, either in concert with other compounds or on their own.Formula: C11H12N4O3S
Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia