Simultaneous Quantitative and Qualitative Analysis of Flavonoids from Ultraviolet-B Radiation in Leaves and Roots of Scutellaria baicalensis Georgi Using LC-UV-ESI-QTOFMS

Abstract EN

Scutellaria baicalensis Georgi is one of the most widely used traditional Chinese herbal medicines.

It has been used for anti-inflammatory, anticancer, antibacterial activities, and so forth.

Long-term enhanced ultraviolet-B (UV-B) radiation caused more effect on leaves than on roots of the plant.

Liquid chromatography-ultraviolet detection coupled with electrospray ionization quadrupole time-of-flight mass spectrometry (LC-UV-ESI-Q/TOF/MS) method was applied for simultaneous quantitative and qualitative analysis of flavonoids in leaves and roots of S.

baicalensis by enhanced UV-B radiation.

Both low-intensity radiation and high-intensity radiation were not significantly increaseing the contents of baicalin, wogonoside, and wogonin in roots.

However different intensity of radiation has different effects on several flavonoids in leaves.

Both low-intensity radiation and high-intensity radiation had no significant effect on contents of baicalin and tectoridin in leaves; the content of scutellarin was significantly decreased by low-intensity radiation; chrysin was detected in low-intensity radiation and high-intensity radiation, and chrysin content is the highest in low-intensity radiation, but chrysin was not detected in control group.

Different changes of different flavonoids under enhanced UV-B radiation indicate that induction on flavonoids is selective by enhanced UV-B radiation.