Fabrication of a colorimetric ammonia nitrogen indicator using ube peel-derived anthocyanins in a gellan gum/carboxymethyl cellulose matrix
This study develops a sustainable, porous colorimetric indicator for ammonia nitrogen monitoring by encapsulating ube peel-derived anthocyanins in an optimized gellan gum and carboxymethyl cellulose matrix crosslinked with calcium chloride, which demonstrated effective encapsulation, structural stability, and a strong correlation (R² = 0.9058) for ammonia detection.