Abstract:
To study the levels of solvent residues in plant extracts, 27 residual solvents in 15 samples of 5 types of extracts (medlar, hawthorn, chrysanthemum, jasmine, osmanthus) were qualitatively and quantitatively analyzed by static headspace (HS) combined with GC-MS. The samples were dissolved in headspace vials and kept warm at 60℃ for 15 min. A sample of 0.40 mL headspace volatiles was injected into GC-MS using external standard for peak identification. NIST database and standards plus internal standards were used for qualitatively and quantitatively analyses, respectively. The results showed that: 1) The linear range of quantitatively analysis for 12 solvents was satisfactory with the
r values all above 0.99, and the recovery and RSD values were in the range of 78.60%-120.80% and 11.50%-16.94%, respectively. 2) Ethyl alcohol was the main residual solvent in medlar, hawthorn, chrysanthemum, and osmanthus (GH1) extracts. The main residual solvents in the other osmanthus extracts (GH2, GH3) and jasmine extracts were methylcyclopentane, n-hexane, isohexane and cyclohexane.