A novel premixing strategy for highly sensitive detection of nitrite on paper-based analytical devices

• Published in: Analytica chimica acta Vol. 1299; p. 342417
• Main Authors: Xu, Xiaohu, Nilghaz, Azadeh, Wan, Xiaofang, Liu, Shan, Xue, Meigui, Guo, Wan, Tian, Junfei
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 22.04.2024
• Subjects: Azo Compounds; Limit of Detection; Meat samples; Nitrite detection; Nitrites - analysis; Paper-based analytical devices; Premixing strategy; Rapid food safety and quality analysis; Sulfanilamide; Premixing strategy; Meat samples; Nitrite detection; Rapid food safety and quality analysis; Paper-based analytical devices
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2024.342417

Nitrite has been involved in many food processing techniques and its excessive consumption is closely related to the development of different diseases. Therefore, highly sensitive detection of nitrite is significant to ensure food safety. This study presents a simple and novel strategy for the highly sensitive detection of nitrite in food using paper-based analytical devices (PADs). In this proposed strategy, the nitrite present in the sample undergoes efficient diazotization when initially mixed with sulfanilamide solution before reacting with N-(1-naphthyl) ethylenediamine dihydrochloride (NED) coated on the detection region of the PAD, leading to the maximum production of colored azo compounds. Specifically, within the concentration range of 0.1–20 mg/L, the LOD and LOQ for the nitrite assay using the premixing strategy are determined as 0.053 mg/L and 0.18 mg/L, respectively which significantly surpass the corresponding values of 0.18 mg/L (LOD) and 0.61 mg/L (LOQ) achieved with the regular Griess reagent analysis. The study highlights the critical importance of the premixing strategy in nitrite detection. Under optimized conditions, the strategy demonstrates an excellent limit of detection (LOD) and limit of quantification (LOQ) for nitrite detection in eight different meat samples. In addition to its high precision, the strategy is applicable in the field of nitrite analysis. This strategy could facilitate rapid and cost-effective nitrite analysis in real food samples, ensuring food safety and quality analysis. [Display omitted] •Novel premixing strategy enables sensitive nitrite detection on μPADs.•Enhanced LOD and LOQ compared to conventional Griess assay.•Successful application in 8 food samples validates practicality and reliability.