Inhibition of Rat 5α-Reductase Activity and Testosterone-Induced Sebum Synthesis in Hamster Sebocytes by an Extract of Quercus acutissima Cortex
Table 1
Quantification of constituents in an extract of BK, from cortex of Quercus acutissima.
Compound category
Subcategory
Name
Molecular weight
Amount (mg/g BK)
With gallate group
Gallotannin
Tetragalloyl glucose
788.55
0.767
Gallotannin
Pentagalloyl glucose
940.68
3.71
Gallotannin
Hamamelitannin
484.36
0.928
Ellagitannin
Eugeniin
938.66
4.74
Ellagitannin
1-Desgalloyl eugeniin
786.54
2.65
Ellagitannin
Casuarinin
936.64
0.154
Ellagitannin
Castalagin
934.63
5.91
Ellagitannin
Stenophyllanin C
1056.14
1.33
Flavonoid
(−)-Epicatechin gallate
442.37
0.238
Flavonoid
(−)-Epigallocatechin gallate
458.40
0.0603
Gallic acid
170.12
2.89
Methyl gallate
184.15
0.113
Without gallate group
Coumarin
Fraxin
370.31
0.183
Flavonoid
(+)-Catechin
290.27
10.7
Flavonoid
(±)-Gallocatechin
306.27
1.69
Flavonoid
Chrysin
254.24
†BQL
Flavonoid
(+)-Taxifolin
304.25
0.0636
Flavonoid
Luteolin
286.24
0.00366
Flavonoid
Quercetin
302.20
0.00856
Flavonoid
Quercitrin
448.38
0.00142
Flavonoid
Genistein
270.24
0.000234
Methanol/water extracts of dried BK (Lot No. 2131093010) were analyzed by LC-MS/MS. Previously reported to exist in the cortex of Quercus acutissima. †Amount of chrysin was below the quantification limit (BQL). The limit of quantification of chrysin is 0.000800 mg/g.