Hydrolysis of Glycosidic Flavonoids during the Preparation of Danggui Buxue Tang: An Outcome of Moderate Boiling of Chinese Herbal Mixture

Table 1

Mass spectra properties of marker chemicals.

Chemical	Formula	Calculated mass [M]	Precursor ion [M − H]^a	Fragmentor energy^b	Collision energy^c	Production ion^d	Retention time (min)^e
Formononetin	C16H12O4	268.1	267.1	150	17	252	13.966
					29	223
Astragaloside IV	C41H68O14	784.9	829.5^f	190	5	829.5	9.873
					25	783.2
Calycosin	C16H12O5	284.1	283.1	100	13	268	7.894
					29	211
Ononin	C22H22O9	430.4	465.1	80	5	267.1	6.257
					23	252.1
Calycosin-7-O-𝛽-D-glucoside	C22H22O10	446.1	481	120	5	283.1	2.749
					27	268.1
Ginsenoside Rg1	C42H72O24	800.5	799.5	250	5	799.5	5.293
					21	637.3

aThe detected chemicals had the greatest responses under the negative mode: the [M − H]⁻ was used as the precursor ion.
^bThe fragmentor energy was optimized to have the greatest ionize efficiency.
^cThe collision energy was optimized to have the greatest product ion intensity, which was the key factor in the MRM mode.
^dTwo product ions were used for the MRM analysis. The upper one was used for quantitative analysis and the lower one was for qualitative analysis, which could guarantee the precision of analytes.
^eThe retention time was determined by 3 different individual analyses (𝑛=3).
^fThe precursor ion of astragaloside IV was [M + HCOOH − H]⁻ under the negative mode.