Abstract
1) Under the 3 drying methods of leaf material of lemon-grass, the control (no drying), sun-drying for 3 days, and shade-drying for 5 days, a further study on the title was carried out in 1961 mainly tb clear up the relation between the drying treatment of leaf material and the citral content of oil by use of gas chromatography.
2) Regarding the yield of oil., a result similar to that reported in the previous paper wass recognized; the latter 2 treatments gave a little higher yield of oil as compared with the control.
3) The citral content of oil from the dried leaf material was found to be considerably higher than from the fresh leaf material also in the determination by gas chromatography as in the case by the hydroxylamine method. From this, the increase of citral itself in the oil due to drying of the leaf material was confirmed.
