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Glucono-Delta-Lactone (GDL). An ester (q.v.) of gluconic acid and lactone (q.v.) that, in solution, hydrolyzes (q.v.) slowly into its components. Gluconic acid then reacts with sodium bicarbonate (q.v.) to generate carbon dioxide (q.v.) at a slow but steady rate. GDL finds limited use in some types of baking powder (q.v.).