Innovating Science® - Starch Agar
Manufacturer ID - IS5167
Students will learn about acids and bases through a class discussion and then test a dilute acid and dilute base with neutral litmus paper to learn how the paper indicates something is acidic or basic. Once that skill is learned they can move on to test some common items that would be found around their house to determine if they are acids or bases. Optional: Extra litmus paper is included to test more items either from home or around the school building for a greater understanding of acids and bases. The activity contains enough materials for 6 groups of students.
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Description / Innovating Science® - Starch Agar
Used to determine if bacteria produce extracellular enzymes to catalyze the hydrolysis of starch. Starch agar is inoculated and incubated at 37?C. After 48 hours the surface of the agar is flooded with potassium/potassium iodide solution. Organisms that produce a starch hydrolyzing enzyme will display a clear zone around the area of growth while other areas of the agar containing starch will turn blue-black.
500 g Starch Agar
Use 25 grams with 1 liter of water.
DOT Info:
Non-regulated