Abstract
Eleven steroid hormones (SHs: androstene-3,17-dione, estrone, β-estradiol, α-estradiol, testosterone, dehydroepiandrosterone, 17á-hydroxyprogesterone, medroxyprogesterone, megestrol acetate, progesterone, and androsterone) were detected from New Zealand deer (Cervus elaphus var. scoticus) velvet antler (NZA, 鹿茸). A method for the quantification of eleven SHs was established by using ultraperformance liquid chromatography (UPLC)-MS/MS. The linearities (R2 > 0.991), limits of quantification (LOQ values, 0.3 ng/mL to 23.1 ng/mL), intraday and interday precisions (relative standard deviation: RSD<2.43%), and recovery rates (97.3% to 104.6%) for all eleven SHs were determined. In addition, a method for the quantification of three 7-oxycholesterols (7-O-CSs: 7-ketocholesterol, 7α-hydroxycholesterol, and 7β-hydroxycholesterol) in the NZA was established by using an HPLC-photodiode array (PDA) method. The linearities (R2 > 0.999), LOQ values (30 ng/mL to 350 ng/mL), intraday and interday precisions (RSD < 1.93%), and recovery rates (97.2% to 103.5%) for the three 7-O-CSs were determined. These quantitative methods are accurate, precise, and reproducible. As a result, it is suggested that the five steroid compounds of androstene-3,17-dione, androsterone, 7-ketocholesterol, 7α-hydroxycholesterol, and 7β-hydroxycholesterol could be marker steroids of NZA. These methods can be applied to quantify or standardize the marker steroids present in NZA.
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![]() | Fig. 1.The total ion chromatograms for the eleven standard steroid hormones (1. androstene-3, 17-dione; 2. estrone; 3. β-estradiol; 4. α-estradiol; 5. testosterone; 6. dehydroepiandrosterone; 7. 17α-hydroxyprogesterone; 8. medroxyprogesterone; 9. megestrol acetate; 10. progesterone; 11. androsterone) (A) and New Zealand deer antler's 70% ethanol fraction (B) by UPLC-MS/MS in multiple reaction monitoring mode. |
![]() | Fig. 2.The chromatograms for (A): the standard of three 7-oxycholesterols (7-ketocholesterol, 7α-hydroxycholesterol, and 7β-hydroxycholesterol); (B): the 70% ethanol fraction (mixture of tip, upper, middle, and base) of New Zealand deer antler; (C): the chromatograph of 100 times the height of (B) by HPLC-PDA. |
Table 1.
UPLC-MS/MS detection conditions for the eleven SHs
Table 2.
Regression equation, correlation coefficients (R2), linear range, the LODs, and the LOQs for eleven SHs and three 7-O-CSs
Table 3.
Intraday and interday precisions of eleven SHs and three 7-O-CSs (n=3)
Table 4.
Recovery of eleven SHs and three 7-O-CSs
Table 5.
The levels of eleven SHs and three 7-O-CSs in NZA
The data (mean±standard deviation) are based on the triplicate determinations; A: New Zealand deer antler marker steroid; Mixture: mixture of 4 part (tip, upper, middle, and base); RM: raw material; AE: alcohol extract.; WE: water extract; SH: steroid hormone; 7-O-CS: 7-oxycholesterol; NZA: New Zealand deer antler