摘要In this work,an easy-to-use fluorometric sensor array in the form of freshness progress bar was fabricated by programmable inkjet printing,enabling consumer-level freshness visualization of Hot-pot dishes(fish,chicken and beef).Firstly,the freshness progress bar was optimized with 2 spoilage-responsive indicators(fluorescein isothiocyanate and rhodamine B)encapsulated in metal-organic framework zeolitic imidazolate framework-8(ZIF-8).Subsequently,a 40 mm × 10 mm freshness progress bar was precisely fabricated by programmable inkjet printing,ensuring adequate uniformity and reproducibility.The freshness progress bar showed high sensitivity up to 1.343 mg/kg to the total volatile basic nitrogen(TVB-N),good reproducibility(relative standard deviation(RSD)＜5％)and long-term stability(signals remained 92.6％after 10 days of storage).With chemometric analysis,the freshness status of samples could be easily identified.Furthermore,the visual information of freshness progress bar consistent with the TVB-N stipulated by the national standard,showing consistence coefficient of R2＞0.96.Therefore,the freshness progress bar may enable consumer-level management of the Hot-pot foods,which was particularly suitable for E-commerce sales.