By laboratory simulating oil-water separation, the key step of producing citrus peel essential oil by cold-pressing methods, the differences of volatile organic compounds (VOCs) in two consecutive aqueous effluents (AEs) and cold-pressed oil (CPO) were analyzed, and the recycling value of aqueous effluents VOCs was discussed. Techniques of headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) combined with retention index and internal standard method were used for qualitative and quantitative analysis. A total of 75, 72 and 63 VOCs were identified respectively in aqueous effluent I & II and the oil. Eleven components with high water solubility, including ethanol, (Z)-2-penten-1-ol, ethyl acetate, 2, 3-butanedione, (E)-2-pentenal and etc. were only found in the aqueous effluents. Concentration of common VOCs is higher in CPO; however, the total amount of VOCs in aqueous effluents was higher than that in CPO, considering the large volume of AEs. Significant differences (P<0.01) were found for the proportion of each aroma type of the VOCs among the three samples; percentage of VOCs that contributed mainly for floral and fat notes was higher in AE I (4.88%, 3.37%) than in AE II (2.34%, 2.42%) and CPO (0.81%, 1.08%). The more water-soluble VOCs from orange peel oil retained in aqueous effluents and characterized the AEs of more floral, fat and green notes. Recycling and reuse of these aqueous VOCs may broaden the products line of natural citrus essence and thus obtain substantial economic benefits.
张群琳
,
李贵节
,
程玉娇
,
何雅静
,
ROUSEFF R L
,
谷利伟
,
吴厚玖
,
孙志高
. Analysis of volatiles differences among aqueous effluents and essential oil from cold-pressing process of orange peel oil[J]. Food and Fermentation Industries, 2019
, 45(23)
: 214
-221
.
DOI: 10.13995/j.cnki.11-1802/ts.021492
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