The chemistry of plant and animal life . Fig. 76.—Obtaining starch from potato. stand for twenty minutes, or until the starch has all settled; pouroff the water. If the starch is not clean, wash by adding morewater, and allow it to settle again; then pour off the water. Leavethe cylinder in the desk until the starch is dry. Save this starchfor the following tests: Tests for starch. Place gram of starchin a test-tube, about one-half full of water. Shake the test-tube, boil,and filter; then to this filtrate add a few drops of iodin. Treat asecond portion of starch with cold water and then ad
The chemistry of plant and animal life . Fig. 76.—Obtaining starch from potato. stand for twenty minutes, or until the starch has all settled; pouroff the water. If the starch is not clean, wash by adding morewater, and allow it to settle again; then pour off the water. Leavethe cylinder in the desk until the starch is dry. Save this starchfor the following tests: Tests for starch. Place gram of starchin a test-tube, about one-half full of water. Shake the test-tube, boil,and filter; then to this filtrate add a few drops of iodin. Treat asecond portion of starch with cold water and then add iodin. Questions, (i) What was the difference in the action of hot and l86 AGRICULTURAI^ CHEMISTRY cold water upon starch ? (2) How did this difference show itselfin the tests? (3) Why in the one test-tube were there a blue massand a clear liquid, and in the other opposite results ? 240. Dextrin is a carbohydrate which has the samegeneral formula as starch from which it differs in struc-tural composition. Dextrin is produced from st
Size: 2945px × 849px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorklondonthema
