This medicinal herb's chemical fingerprint barely changes with the seasons
Barroso Neto MS, Lopes ENMB, Marques MOM, Silva AAR, Carvalho PO, Sawaya ACHF.
Medicinal Plants
If you grow or forage medicinal herbs, this shows that harvest timing matters less than which individual plant you pick, since genetic chemotype outweighed season in shaping the plant's chemistry.
Lippia alba is a Brazilian herb used in traditional medicine, and different plants of the same species can smell and taste quite different because they produce different chemical mixes, called chemotypes. Researchers tested five of these plants twice, once in the rainy season and once in the dry season, and found that four of them kept making the same signature scent compounds both times. That's good news for anyone using this plant medicinally, since it means the plant's chemical identity is mostly fixed by its genetics rather than the weather.
Key Findings
4 of 5 Lippia alba individuals maintained the same major essential oil compound between rainy and dry seasons
Each volatile chemotype had distinct major compounds that remained consistent regardless of season
Nonvolatile chemical composition was similar across all five individuals, with only some compounds showing seasonal variation
chevron_right Technical Summary
Scientists analyzed five plants of Lippia alba, a Brazilian medicinal herb, across rainy and dry seasons and found that its essential oil chemistry stays remarkably stable across seasons for most plants, while other chemical compounds shift only slightly with the weather.
Abstract Preview
Original paper
Seasonal Effect on the Chemical Composition of Lippia alba Volatile Chemotypes.
Lippia alba (Verbenaceae) is a native Brazilian medicinal species with varied applications, notable for the diversity of volatile chemotypes defined by the major compounds of its essential oil, wit...
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Lippia alba is a species of flowering plant in the verbena family, Verbenaceae, that is native to southern Texas in the United States, Mexico, the Caribbean, Central America, and South America.