LC-ESI-QTOF-MS/MS Characterisation of Phenolics in Herbal Tea Infusion and Their Antioxidant Potential

Ginger (Zingiber officinale R.), lemon (Citrus limon L.) and mint (Mentha sp.) are commonly consumed medicinal plants that have been of interest due to their health benefits purported antioxidant capacities. This study was conducted on the premise no previous has performed elucidate phenolic profile ginger, herbal tea infusion (GLMT). The aim investigate characterise contents lemon, GLMT, as well determine potential. Mint recorded highest total content, TPC (14.35 ± 0.19 mg gallic acid equivalent/g) 2,2?-azino-bis(3-e-thylbenzothiazoline-6-sulfonic acid), ABTS (24.25 2.18 ascorbic activity. GLMT activity in reducing power assay, RPA (1.01 0.04 hydroxyl radical scavenging •OH-RSA (0.77 0.08 equivalent/g). Correlation analysis showed content positively correlated with Venn diagram revealed contained a high proportion exclusive compounds. Liquid chromatography coupled electrospray ionisation quadrupole time flight tandem mass spectrometry (LC-ESI-QTOF-MS/MS) characterised 73 compounds, out which 11, 31 49 were found respectively. These compounds include acids (24), flavonoids (35), other (9), lignans (4) stilbene (1). High-performance liquid photometric diode array (HPLC-PDA) quantification does contain relatively concentration presented potential its ingredients, may increase confidence developing into functional food products or nutraceuticals.