研究目的
To analyze the FTIR spectra of four essential oils extracted from dried leaves of aromatic plants.
研究成果
The FTIR spectra of the essential oils from parsley, lovage, basil, and thyme are very similar, with the main compounds dominating the vibrational spectra. This suggests that FTIR spectroscopy is effective for characterizing such oils, but future studies could explore a wider range of plants or combine with other analytical techniques for more detailed composition analysis.
研究不足
The study is limited to four types of essential oils and relies on FTIR spectroscopy, which may not detect compounds at low concentrations. The spectral similarities indicate that minor components do not significantly influence the results, but this could be a constraint in differentiating oils with similar main compounds.
1：Experimental Design and Method Selection:
The study used FTIR spectroscopy to characterize essential oils from aromatic plants. Hydrodistillation with a Clevenger-type apparatus was employed for extraction, and FTIR analysis was conducted using a Shimadzu spectrophotometer with HATR accessories.
2：Sample Selection and Data Sources:
Dried leaves of parsley, lovage, basil, and thyme were purchased from a Romanian company. Essential oils were extracted and stored at 4°C until analysis.
3：List of Experimental Equipment and Materials:
Clevenger-type apparatus for hydrodistillation, Shimadzu IRPrestige-21 spectrophotometer with HATR plates (ZnSe), anhydrous sodium sulphate for drying, distilled water, and software (IR Solution by Shimadzu, Origin 7SR1 by OriginLab Corporation).
4：Experimental Procedures and Operational Workflow:
Hydrodistillation of 50 g dried leaves with 750 mL distilled water for 3 hours, drying extracts over anhydrous sodium sulphate, depositing 1000 μL of essential oil on HATR plates, recording FTIR spectra in the range 4000-650 cm?1 with 64 scans per spectrum at 4 cm?1 resolution.
5：Data Analysis Methods:
Data processed using IR Solution and Origin 7SR1 software for spectral analysis and comparison with literature standards.
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