In the course of an investigation which Ph. Eberhardt5) undertook with the object of rendering the staranise trees of Tonkin more productive, he studied the internal morphology of the tree. He found that the mesophyll cells of the leaves are as rich in oil as are the pericarp cells of the fruit in which the oil is especially secreted. Upon distillation of 1 kg. of leaves, Eberhardt obtained 200 drops (hence about 1 p.c.) of a pungent oil. It congealed at 13°, hence had a somewhat lower congealing point than the oil from the fruits which congeals between 16 and 18°.
1) Report of Schimmel & Co. April 1911, 108.
2) Tunmann, Apotheker Ztg. 26 (1911), 370.
3) Value: 257670 M
4) Value: 460710 M
5) Compt. rend. 142 (1906), 407.
According to a communication by J.L.Simon1) an oil from the leaves and twigs of the staranise tree has been distilled in China for some time in the Pe-Se district. ). C. Umney2) has investigated such leaf oils and found the following constants: d15,5o 0,9878; aD + 1°. They congealed at a relatively low temperature (the exact congealing point was not determined by Umney). A comparison of the fractionation of such an oil with that of normal staranise oil revealed remarkable differences.
Below 225° ....
Between 225 and 230°
Above 230° ....
According to these results, the leaf oil contains less anethol but more of the high boiling portions, particularly anisic aldehyde. Whether the latter is characteristic for the leaf oil remains undecided, since the oil examined may have been exposed accidentally to air and thus become oxidized.
Remarkable is the dextro-rotation of the leaf oil. Hence it is not impossible that the poor oils previously mentioned3), which have been designated as flower oils, consisted entirely or in part of leaf oil.