@article{Ramphinwa2022,
abstract = {Bush tea (Athrixia phyllicoides DC.) is a herbal tea which contains bioactive compounds. Naturally, these metabolites aid plants to defend themselves against a wide spectrum of biotic and abiotic stresses. The objective of the study was to identify hydroxyl-cinnamic acids affected by UV (Ultraviolet) light exposure of bush tea through ultra-high-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS). A randomized complete block experimental design was used consisting of control and 80% white shade net replicated three times and samples were analyzed in triplicates. The methanolic leaf extracts of bush tea were exposed to UV light at 254 nm for 24 h and thereafter metabolites were measured and annotated through UHPLC-QTOF-MS. Hydroxyl-cinnamic acids (HCAs) have been shown to undergo photo-isomerization during post UV light exposure, evidenced by the emergence of photo-isomers. The findings showed that hydroxyl-cinnamic acids containing molecules to undergo photo-chemical isomerization, characterized by formation of isomeric molecules with cis geometry. Metabolites which underwent photo isomerization were found to be structurally related as they formed a very tight molecular family when molecular networking algorithm was used.},
author = {Ramphinwa, Maanea L. and Madala, Ntakadzeni E. and Mchau, Godwin R.A. and Ramabulana, Anza T. and Mudau, Fhatuwani N.},
doi = {10.1016/j.scienta.2022.111124},
file = {:C\:/Users/ramab/Downloads/1-s2.0-S030442382200245X-main.pdf:pdf},
issn = {03044238},
journal = {Scientia Horticulturae},
keywords = {Athrixia phyllicoides,Hydroxyl-cinnamic acids,Isomerization,Molecular network,Ultra-high-performance liquid chromatography quadrupole time-of-flight mass spectrometry},
number = {April},
pages = {111124},
publisher = {Elsevier B.V.},
title = {{Effect of UV-induced geometrical isomerization of hydroxyl-cinnamic acid-containing molecules of bush tea (Athrixia phylicoides DC.) using UHPLC-QTOF-MS}},
url = {https://doi.org/10.1016/j.scienta.2022.111124},
volume = {301},
year = {2022}
}

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The methanolic leaf extracts of bush tea were exposed to UV light at 254 nm for 24 h and thereafter metabolites were measured and annotated through UHPLC-QTOF-MS. Hydroxyl-cinnamic acids (HCAs) have been shown to undergo photo-isomerization during post UV light exposure, evidenced by the emergence of photo-isomers. The findings showed that hydroxyl-cinnamic acids containing molecules to undergo photo-chemical isomerization, characterized by formation of isomeric molecules with cis geometry. 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