Development of bacterial cellulose film coated with mixed colorimetric indicator for tracking the freshness/spoilage of ready-to-cook idli batter / P. S. Gaikwad in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 28-37 Titre : Development of bacterial cellulose film coated with mixed colorimetric indicator for tracking the freshness/spoilage of ready-to-cook idli batter Type de document : texte imprimé Auteurs : P. S. Gaikwad, Auteur ; Chayanika Sarma, Auteur ; Anbarasan Rajan, Auteur ; S. Anandakumar, Auteur ; B. K. Yadav, Auteur Année de publication : 2022 Article en page(s) : p. 28-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aliments -- Aspect sanitaire Caractérisation Cellulose bactérienne Colorants Colorimétrie Couches minces Couches minces -- Propriétés thermiques Etiquettes Système de changement de couleur Index. décimale : 667.2 Colorants et pigments Résumé : The current study focuses on the fabrication of a mixed chemical colorimetric pH dye-based indicator to monitor the freshness of ready-to-cook (RTC) idli batter stored under ambient conditions. The base of the indicator label was created using Acetobacter xylinum culture for the fabrication of a bacterial cellulose (BC) membrane film, and the characteristics of the developed film were analysed. Scanning electron microscopy identified the presence of a cellulose fibrils network and Fourier Transform–infrared spectroscopy indicated the presence of an amine group at wavenumber 1642 cm−1 on the developed BC film. Differential scanning calorimetry analysis identified the glass transition, onset, melting and end set melt temperatures as −30.3, 42.2, 85.6 and 105.9°C, respectively, and enthalpy as 209.2 Jg−1. The tensile strength of the developed base layer was found to be low at 27.11 ± 0.05 MPa. The developed base layer was coated with mixed colorimetric pH dyes of bromothymol blue and methyl red in a ratio of 2:3. The fabricated mixed colorimetric indicator label reacted as the carbon dioxide concentrations in the headspace increased from 0.15% ± 0.05% to 17.64% ± 0.11% (v/v) for up to 24 hours, and displayed a colour change of yellow for fresh to reddish orange for spoiled RTC idli batter stored under ambient conditions. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of RTC idli batter - Fabrication of a base layer for the indicator label - Selection and preparation of colorimetric pH dye as an indicator solution - Testing of the developed colour change indicator labels - pH of stored RTC idli batter - Microbial population study of stored RTC idli batter - Statistical analysis - RESULTS AND DISCUSSION : Characterisation of the developed BC film - Colour change of the indicator label caused by carbon dioxide concentration - pH of stored RTC idli batter - Microbial population of stored RTC idli batter - Image acquisition of colour change indicator labels - Table 1 : Intermolecular interaction of developed bacterial cellulose film using Fourier Transform–infrared spectroscopy - Table 2 : Thermal characteristics of developed bacterial cellulose film using differential scanning calorimetry DOI : https://doi.org/10.1111/cote.12564 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12564 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37496 [article]

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