Some unresolved factors in jelly strength determination

✍ Scribed by S.E. Sheppard; S.S. Sweet

• Book ID: 104124970
• Publisher: Elsevier Science
• Year: 1924
• Tongue: English
• Weight: 68 KB
• Volume: 198
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(24)90024-x

✦ Synopsis

THIS paper deals with several variable factors in jelly strength determinations.

Among them the dimensions of test pieces is discussed.

It is shown that shorter pieces have an apparently higher elasticity up to a certain limit, a length of 7.5 cm. The data shown confirm the work of Maurer and Bjerkt!n that there is no change in the volume of jelly during elongation.

The end effect in the torsion instrument is also measured and shown to be negligible with cylinders over one inch in height.

Gelatins were made up and tested on both the plunger tester and the Smith tester, giving proportional results. The relation of jelly strength to H-ion concentration is also discussed, a maximum at a pH of 7 to 9 being checked repeatedly, but not at a p, of 4 to 5.