Comparison of aroma components in Osmanthus fragrans hydrosol from different crafts and flower regions
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Abstract:
To investigate the production process and quality stability of Osmanthus fragrans hydrosol, this study employed GC-MS to conduct a comparative analysis of the aroma components extracted from Osmanthus fragrans fresh flowers using different methods and originating from various locations. The results indicated that significant variations in the aroma components of Osmanthus fragrans hydrosol was based on the extraction method, with a total of only 19 identified components co-existing in three methods. Notably, the hydrosol extracted via water distillation featured dominant components such as β-ionone (19.64%), γ-decalactone (15.82%), and dihydro-β-ionol (12.26%), which collectively contributed to a high aroma content, although impurities were also present. In contrast, the hydrosol extracted using the vacuum freeze-drying method was characterized primarily by dihydro-β-ionone (43.59%), β-ionone (25.73%), and linalool (15.48%), with a notably high concentration of dihydro-β-ionone, albeit with a weaker fragrance. Furthermore, the relative content of linalool oxide in the hydrosol obtained through microwave vacuum drying exceeded 50%, while γ-decalactone accounted for 16.67%. The hydrosol obtained from this method had a balanced composition of components, resulting in a typical and rich fragrance. Additionally, Osmanthus fragrans hydrosol extracted from fresh flowers of different origins comprised a total of 43 aroma components, with linalool oxide, γ-decalactone, β-ionone, geraniol, and dihydro-β-ionone being the predominant active substances. This finding underscored the substantial influence of processing technology on the quality stability of Osmanthus fragrans hydrosol, with microwave vacuum drying emerging as a process worthy of promotion. Furthermore, while variations existed among production areas, the primary components remained largely stable. This research provides a foundational basis for the industrialization, development, and utilization of Osmanthus fragrans hydrosol.
