0.025% thymol blue
100 mm culture tubes
Composition of reaction mixtures
0.2N KOH solution
Dissolve 1.12g KOH in 100ml of distilled water
Place 100 mg rice powder (12% moisture) in 13 x 100 mm culture tubes
the powder with 0.2 ml 95% ethanol containing 0.025% thymol blue.
Shake the tube and add 2.0 ml of 0.2N KOH immediately and disperse
Cover the tubes with glass marbles and place for 8 minutes in a
boiling water bath.
Remove the samples, keep at room temperature for 5 min, and then
cool in ice cold water for 15
tubes horizontally over a ruled paper graduated in millimeters and
measure the length of
the gel from the bottom of the test tube after 30 - 60 minutes.
Gel consistency is
classified as given below.
Cagampang, G.B., CM. Perez and B.O. Juliano (1973). A
gel consistency test for eating quality in rice.
J. Sci. FoodAgr., 24:1598 -1594.