Studies on the components of Aloe arborescens from Japan - Monthly variation and differences due to part and position of the leaf

Monthly variations in the concentrations of barbaloin, isobarbaloin, aloenin, protein, saccharide, polyamines, and the carboxypeptidase activity of Aloe arborescens Miller var. natalensis Berger (Japanese name Kidachi aloe) were studied and correlated with temperature and rainfall. The overall concentration or activity of the components was high in the warm season and low in the cold season, and protein, saccharide, polyamines and carboxypeptidase were strongly affected by rainfall putrescine occurred in low concentrations in August (drought period) and during cultivation in a greenhouse (cold season without watering). The concentrations of barbaloin, isobarbaloin, aloenin, protein, saccharide and carboxypeptidase in different parts and positions of the leaf of Kidachi aloe were also studied.