Abstract
This study compared the influence of mechanical damage and drying on the chemical composition of Mikania glomerata Spreng. and Mikania laevigata Sch.Bip. ex Baker, Asteraceae, leaves. Leaves were collected 1–24 h after damage. Oven-drying at 40° C and shade-drying at ambient temperature were compared to lyophilization. Samples were extracted in 70% ethanol and analyzed by ultra-high-performance liquid chromatography with mass spectrometry. Significant (p<0.05) increases of caffeoylquinic acids were observed in damaged leaves of both species and coumarin decreased in M. laevigata, indicating stress. Although the final water content was similar, the drying method affected the leaf composition. In shade-dried leaves of M. laevigata coumarin decreased and the presence of umbelliferone was observed; caffeoylquinic acid contents increased for 288 h in in both species. Apparently, enzymes were inactivated after 6 h in oven drying, stabilizing their chemical composition, while shade drying allowed enzymatic and microbial activity to continue; illustrating the importance of post harvesting procedures on the quality of medicinal plants.
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AAB contributed in the collection of plant samples, execution of the drying test and laboratory work, chromatographic analysis, data analysis and elaboration of the work. CLA has contributed to the development of assembling and obtaining the data related to the damage test. ACHFS contributed to the supervision of laboratory work, translated the article into the English language and contributed to the critical reading of the manuscript. All authors read the final manuscript and approved the submission.
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Borghi, A.A., de Almeida, C.L. & Sawaya, A.C.H.F. Damage and drying modify the composition of Mikania glomerata and Mikania laevigata leaves. Rev. Bras. Farmacogn. 29, 793–797 (2019). https://doi.org/10.1016/j.bjp.2019.08.006
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DOI: https://doi.org/10.1016/j.bjp.2019.08.006