2.

(a) Illustration of the preparation process of dZIF-8 BH through double-cross-linked alginate gelatinization and its application in colorimetric sensing based on a biocatalytic cascade mechanism; (b) retained sensing activity of biosensors stored at room temperature for 30 days highlights the stability of the system under testing conditions (1 mM glucose, 15 min incubation). Reprinted from ref with permission from the American Chemical Society, copyright 2022.