Chemical fingerprint and bioactivity evaluation of Globularia orientalis L. and Globularia trichosantha Fisch. & C. A. Mey. using non-targeted HPLC-ESI-QTOF-MS approach.
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In the quest for new sources of biologically-active compounds, the chemical, and biological profiles of two Globularia species (G. trichosantha Fisch. & C. A. Mey and G. orientalis L.) were investigated.Chemical profiles were evaluated by high-performance liquid chromatography coupled to electrospray ionisation and quadrupole time-of-flight mass spectrometry (HPLC-ESI-QTOF-MS), as well as by their total phenolic, flavonoids, and phenolic acids contents. The antioxidant abilities of the investigated extracts were done using different assays including free radical scavenging [1,1-diphenyl-2-picryl-hydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS)], reducing power (cupric reducing antioxidant capacity and ferric reducing antioxidant power), phosphomolybdenum, and metal chelating. Inhibitory potential against key enzymes involved in neurodegenerative diseases (cholinesterases; AChE, and BChE), diabetes (α-glucosidase and α-amylase), hyperpigmentation (tyrosinase) and obesity (pancreatic lipase) were evaluated.Globularia trichosantha and G. orientalis extracts showed remarkable antioxidant properties, with the water extracts being a better source of antioxidant compounds. Both species showed remarkable inhibitory effects against the target enzymes. However, for both species, only the acetyl acetate and methanolic extracts were potent against cholinesterases and lipase.HPLC-ESI-QTOF-MS analysis revealed the presence of 107 compounds from G. trichosantha and G. orientalis, among which, 43 compounds have been preliminarily characterised for the first time from the Globulariaceae family. To date, this study can be considered as the most comprehensive research focused on the characterisation of G. trichosantha and G. orientalis. Results amassed from this study tend to show that these plants represent a rich source of biologically active compounds which can be further explored and validated for their therapeutic potential.
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