Gum Production by Azotobacter Chroococcum of Beijerinck and Its Composition

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Abstract
A. chroococcum was shown to produce a gum, with various carbohydrates as nutrients. The more complex carbohydrates are more readily utilized than the mono- and di-saccharides. Presence of a protein, such as peptone, enhances gum production but was not found necessary; a solution of peptone alone does not furnish material for gum production. The gum is a carbohydrate of the higher series. Boiling with acid does not cause it to reduce Fehling''s solution. It is levo-rotatory and therefore of the true gums, and not the dextrins. The trace of combined N found is probably due to remains of bacterial cells not removed in the purifying process. Results of analysis place the gum in "Class I" of Haas and Hill (1923), and under this classification it would be termed an arabin.

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