Abstract
The method of determination of the ribonucleic acid (RNA) content of gelatin has been improved and thirty different gelatins (bone or hide, lime or acid processed, inert or active ...), chosen to represent the actual production, have been analyzed.Despite the diversity of the analyzed gelatins, all the values obtained are small, when not nil. According to these measurements, the ribonucleic acid level in photographic gelatin approaches a maximum of 0.1–0.2 milligram/gram, even in gelatins like DGF 5294 and Stoess 2766 which contain respectively 2.5 and 3.0 milligrams of deoxyribonucleic acid (DNA) per gram. For these gelatins the RNA/DNA ratio is about 1/20.The RNA levels found in this study are compared with values previously determined and those differences which exceed the error limits of the former method are discussed.
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