pH sensing intelligent packagingTo prepare pH-sensitive sensor based CMC hydrogel and investigate its pH sensing performances.ObjectiveExperimental
Methyl orange indicator
CMC concentration (0.5-2.0 %w/v)
Plasticizer content (0.25-1.0 %v/v)
Crosslink agent content (0.1-1.0 %v/v)
Swelling
Tensile properties
UV-VIS Spectrophotometer
pH range of 2-12Results & discussionConclusion
CMC film with 0.25% glycerol & 0.5% epichlorohydrinprovides optimal mechanical properties.
Color change range of immobilized methyl orange on CMC hydrogel can be used as pH optical sensor in pH range of 2-12
Reference: Mohammad Hosseini, Rouhollah Heydar and Mohammad Alimoradi, “A novel pH optical sensor using methyl orange based on triacetylcellulose membranes as support”, Journal of Spectrochimica Acta Part A, 128 (2014), 864-867.pH2 pH4 pH6 pH8 pH10 pH12
Effect of plasticizer contentPreparation of pH-sensitive CMC hydrogelCharacterizationpH sensing performance test“Packaging that contains an external or internal indicator to provide information about the quality of foods by monitoring the change of pH during the shelf-life of foods”