Abstract: A method for preparing a Eucalyptus extract which decreases the Eucalyptus-specific odor and obtains the effective ingredient in high purity and high yield as a physiologically-active ingredient. An essential oil constituent is removed from the Eucalyptus plant and the residue is extracted with water or an organic solvent aqueous solution. Next, the obtained extraction residue is further extracted with an organic solvent aqueous solution or an organic solvent, whereby Macrocarpal A, Macrocarpal B, and Macrocarpal C contained in the Eucalyptus as a physiological active substance are prepared in higher content than using conventional methods. Further, the extract has improved good taste, appearance, and other desirable properties.

Abstract: A method for preparing a Eucalyptus extract which decreases the Eucalyptus-specific odor and obtains the effective ingredient in high purity and high yield as a physiologically-active ingredient. An essential oil constituent is removed from the Eucalyptus plant and the residue is extracted with water or an organic solvent aqueous solution. Next, the obtained extraction residue is further extracted with an organic solvent aqueous solution or an organic solvent, whereby Macrocarpal A, Macrocarpal B, and Macrocarpal C contained in the Eucalyptus as a physiological active substance are prepared in higher content than using conventional methods. Further, the extract has improved good taste, appearance, and other desirable properties.

Abstract: It is an object of the present invention to provide a chewing gum, by which an effect of preventing periodontal disease is obtained through mastication without performance required for a chewing gum being impaired, such as taste, appearance, and physical properties and storage stability as a product. A chewing gum containing Eucalyptus extract of the present invention is characterized by containing at least one kind of macrocarpal A, macrocarpal B, and macrocarpal C, contents of the macrocarpal A, the macrocarpal B, and the macrocarpal C being 0.001 to 0.0045% by weight, 0.003 to 0.0045% by weight, and 0.0015 to 0.0045% by weight with respect to a total weight of the chewing gum, respectively.