Characteristic Aroma Components of Tosa-buntan(Citrus grandis Osbeck forma Tosa) Fruit.

Abstract

The volatile components of Tosa-buntan (Citrus grandis Osbeck forma Tosa) cold-pressed peel oil were studied by GC and GC-MS. The characteristic aroma compounds were investigated by GC-olfactometry in which a semi-bore capillary column, DB-Wax, was used for effective separation of the volatile components of the oil. Hydrocarbons including mono and sesquiterpenes of the oil accounted for about 98% of the volatile components. The characteristic flavor was also present in the oxygenated fraction. Flavor dilution (FD) factors of the volatile flavor components of the cold-pressed oil were determined by aroma extraction dilution analysis. The relative flavor activity derived from FDfactor and peak area percent was used in this experiment. It was suggested that compounds with higher relative flavor activity such as decanoic acid, heptyl acetate, a a a a-bisabolol, nonanal, cis, trans-farnesol, trans-nerolidol and 2-dodecenal would contribute to Tosa-buntan flavor. Careful sniff testing revealed 2-dodecenal to be a characteristic or key compound of Tosa-buntan aroma. A solution of this authentic compound below 2 ppm gave a pleasant and refreshing aroma similar to Tosa-buntan flavor.

Chemical Composition and Antiproliferative Activity of Supercritical CO2 Extracts from Citrus Fruits

“…Conventional methods of extraction show that the concentration of limonene in C. grandis peel is 72.31 − 94.8% in samples from different geographic origins (Khan et al, 2007, Sawamura et al, 2001, Njoroge et al, 2005. However, in the present study, limonene was 18.67% in whole fruits of dangyuja, whereas it was 3.41% and 12.14% in phalsak and yeagam respectively.…”

“…c) relative peak area percentage (peak area relative to the total peak area %) d) −, not detected. citronellal, linalool, β-caryophyllene, α-terpineol, and nootkatone are common among different geographically located samples (Sawamura et al, 2001;Njoroge et al, 2005). Additionally, γ-sitosterol, stigmasterol, and tengeretin as well as free fatty acids and their esters previously reported in immature dangyuja fruits (Lim et al, 2009), were also found in the supercritical extract of mature fruits in this study.…”

“…Most of the alcohols detected in the fruit extracts were monohydric terpenoidal alcohols at < 1% concentration. We focused on the level of nootkatone and 2-dodecenal as characteristic compounds of the species as mentioned in a previous study (Sawamura et al, 2001). We noticed that nootkatone was the only common ketone compound, whereas 2-dodecenal was detected only in incubator at 37℃ in a 5% CO 2 atmosphere.…”

Chemotaxonomy of Indonesian <i>Citrus maxima</i> based on Leaf Essential Oils

“…Tomi et al (2008) reported the use of essential oils in determining hybrid status by comparing oil profiles between hybrid plants and their putative parents. Previous studies on the use of essential oils for clarifying taxonomic status and hybrid identification on Citrus have been reported (Sawamura et al, 2001;Gogorcena and Ortiz, 2006;Tao et al, 2008). In this study, the variability of essential oil composition among 40 samples of Indonesian C. maxima cultivars and landraces was examined along with their taxonomic implication in defining infraspecific grouping within the species.…”

“…Reserach on Citrus essential oils are generally conducted in relation to their aromatic properties applied in food industry, cosmetics and perfume (Sawamura et al, 2001;Gogorcena and Ortiz, 2006;Tao et al, 2008). Several studies revealed the use of essential oils from various plant species as food preservatives, antimicrobial agent and natural pesticides.…”