Open AccessThe freezing of gelatin gel
Author(s) -
T. F. Moran
Publication year - 1926
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1926.0092
Subject(s) - gelatin , distilled water , homogeneous , chromatography , chemistry , materials science , biochemistry , mathematics , combinatorics
"Ash-free" gelatin supplied by the Eastman Kodak Company was used throughout. The actual content of ash was found to be 0·05 per cent. of the dry weight. To prepare gels of known strength, the requisite amounts of gelatin and water were left together overnight and then heated at 60° to 80° C. on a water-bath for the least time required to produce a homogeneous solution. When dissolved in distilled water, the hydrogen-ion content of the gel was found to be 10-4·7 gram ions per litre (i. e. ,p H = 4·7), which is the iso-electric point for gelatin. Save where the contrary is stated, discs of gel as nearly as possible 1·5 cms. in diameter 0·3 cm. in thickness were used.