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Detecting spoilage without opening packaging is increasingly important. Smart packaging, a third-generation innovation, was developed to improve spoilage detection. A smart label was created using encapsulated polymer\/bromothymol blue and analyzed using Attenuated Fourier Transform Infrared (ATR-FTIR) spectroscopy. In acidic and basic media, significant shifts in the -OH group on the benzene ring were observed (840 to 813\u00a0cm\n                    <jats:sup>\u2212\u20091<\/jats:sup>\n                    ). Ultraviolet-visible (UV-Vis) spectroscopy showed shifts in maximum absorption at 610 and 411\u00a0nm, depending on pH. The label\u2019s topography was studied with a polarized optical microscope (POM), and dynamic light scattering (DLS) revealed nano-encapsulation particle sizes of 63\u201384\u00a0nm with a unimodal distribution. Additionally, a strong positive correlation (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.5) was found between aerobic plate count and pH (0.82), demonstrating a connection between microbial activity and food quality. Bromothymol blue capsules (BC) effectively visualized pH changes, confirming their potential as indicators for food spoilage. Sensory evaluation of BC indicates its suitability as a safe and effective intelligent label for monitoring chilled chicken fillets.\n                  <\/jats:p>","DOI":"10.1007\/s13197-025-06339-3","type":"journal-article","created":{"date-parts":[[2025,6,25]],"date-time":"2025-06-25T03:41:45Z","timestamp":1750822905000},"page":"979-989","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Smart packaging materials based nanoencapsulated bromothymol as monitoring sensors for spoilage of chilled fillet"],"prefix":"10.1007","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2509-3832","authenticated-orcid":false,"given":"Saber","family":"Ibrahim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hager","family":"Fahmy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khaled","family":"Elkhawas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahmad","family":"Labeeb","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,6,25]]},"reference":[{"key":"6339_CR14","doi-asserted-by":"publisher","unstructured":"Abdellatif MM, Ibrahim S, Nomura K (2020) Efficient and eco-friendly low-molecular-weight gelators based on L-phenylalanine as promising remediation tool for oil pollution. 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