Table 5.
Free amino acids (ng/mL) of rosemary infusions from different commercial brands, detected and quantified by RP-HPLC-FLD.
| Free Amino Acid | Commercial Brand | |||
|---|---|---|---|---|
| A | B | C | D | |
| Aspartic acid | n.d. | n.d. | n.d. | n.d. |
| Glutamic acid | n.d. | n.d. | n.d. | n.d. |
| Asparagine | tr | 1.28 ± 0.00 b | 1.34 ± 0.00 a | n.d. |
| Serine | tr | n.d. | n.d. | n.d. |
| Glutamine | n.d. | n.d. | n.d. | n.d. |
| Histidine | n.d. | n.d. | n.d. | n.d. |
| Glycine | n.d. | n.d. | n.d. | n.d. |
| Threonine | n.d. | n.d. | 1.27 ± 0.02 a | 1.27 ± 0.01 a |
| Arginine | n.d. | n.d. | n.d. | n.d. |
| Alanine | 1.03 ± 0.01 a | 1.01 ± 0.03 ab | 1.00 ± 0.01 ab | 0.97 ± 0.00 b |
| Tyrosine | n.d. | n.d. | 0.02 ± 0.00 | n.d. |
| Valine | n.d. | n.d. | n.d. | n.d. |
| Methionine | n.d. | n.d. | n.d. | n.d. |
| Tryptophan | n.d. | n.d. | n.d. | n.d. |
| Phenylalanine | 0.57 ± 0.06 b | 0.68 ± 0.01 b | 0.89 ± 0.08 a | 0.95 ± 0.03 a |
| Isoleucine | 0.68 ± 0.02 b | 0.76 ± 0.02 b | 0.87 ± 0.04 a | 0.95 ± 0.02 a |
| Leucine | n.d. | n.d. | n.d. | n.d. |
| Lysine | n.d. | n.d. | n.d. | n.d. |
| Hydroxyproline | n.d. | n.d. | n.d. | n.d. |
| Proline | 0.20 ± 0.01 a | 0.18 ± 0.02 a | 0.19 ± 0.02 a | 0.17 ± 0.01 a |
The results are expressed as mean ± standard deviation (infusions prepared in triplicate). Within each line, different letters symbolize significant differences between commercial brands (p < 0.05). n.d., not detected; tr, traces.