Preparation of Citrus essential oils: effects of silica gel treatment on volatile composition of yuzu (Citrus junos) cold-pressed peel oil

Njoroge, S.M.; Sawamura, M.

Journal of Essential Oil Bearing Plants 7(1): 1-8

2004


ISSN/ISBN: 0972-060X
DOI: 10.1080/0972-060x.2004.10643358
Accession: 004279929

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Abstract
The effects of silica gel, a substance commonly used for fractionation of essential oils during preparation, were investigated on cold-pressed peel oil of yuzu (C. junos), a sour Citrus fruit. The silica gel treatment was performed for 24 h at 20, 5 and -21 degrees C. The volatile components were determined using GC and GC-MS. Important compositional changes occurred at 20 and 5 degrees C and minimally or virtually absent at -21 degrees C. The notably decreased groups were monoterpene hydrocarbons (from 95.7 to 75.2%), sesquiterpene hydrocarbons (from 2.1 to 1.0%) and monoterpene alcohols (from 2.2 to 1.7%). The main decreases were of limonene, phellandrene, gamma -terpinene, terpinolene, beta -elemene, caryophyllene, trans- beta -farnesene, germacrene D and bicyclogermacrene. Increases of p-cymene, aromadendrene, allo-aromadendrene, cadinene, trans-sabinene hydrate and alpha -terpineol occurred. Artifact compounds including beta -copaene, d-camphor, viridiflorol and spathulenol were formed. The use of silica gel for preparative treatment of complex Citrus oils could cause alteration of the original composition. The results could be applicable for quality control at the perfume or Citrus juice factory.