Excerpt:
For several years one of the objectives of this laboratory has been the development of a satisfactory spectroscopic method of analysis of simple extracts of biological materials for each of the principal carotenoid pigments. Efforts are being made to devise methods by which several pigments in a single extract may be analyzed with as little manipulation as possible. The degree of simplicity will depend: upon the number and nature of the pigments present and the ease of extraction, as well as other factors which may vary according to the material.
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