Table 1.
The content of xanthohumol (1) achieved by HPLC in the investigated spent hops extracts type I (obtained by solvent extraction) and type II (obtained from extracts type I by the removal of 1).
| Extracts Type I | Xanthohumol [µg/mg] a | Extracts Type II | Xanthohumol [ng/mg] a |
|---|---|---|---|
| methylene chloride | 51.15 ± 0.14 | methylene chloride | ˂0.5 b |
| ethyl acetate | 90.95 ± 0.28 | ethyl acetate | 397 ± 15.18 |
| acetone | 99.70 ± 0.31 | acetone | 278 ± 17.95 |
| methanol | 31.65 ± 0.60 | methanol | 1.5 ± 0.91 |
a Data are mean ± SD (standard deviation); b value under the limit of quantification.