The Distribution of the “Grass Juice Factor” in Plant and Animal Materials

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Abstract
The relative distribution of the “grass juice factor” in plant and animal tissues is reported. Animal tissues appear to be a poor source of the factor. The amount present in plant materials varies considerably. The young rapidly metabolizing plant tissues are much richer in this growth promoting substance than the older and more mature plant material. Much of the original activity can be retained by careful drying and storage at low temperatures. The factor is labile to oxidation. Glucuronic acid, narcotine, citrin and specific fractions of citrin, i.e., hesperidin, and calcium eriodictate, do not have the activity of the “grass juice factor.”