Carrots odour

The antennal olfactory receptor system in several phytophagous insects is very sensitive in the detection of the green odour components. In the Colorado beetle Leptinotarsa decemlineata, the threshold of response for trans-2-hexen-1-ol is circa 10b molecules per ml of air (17). In comparison, at 760 mm Hg and 20 C, 1 ml of air contains about 1019 molecules. The insects tested i.e., the migratory locust Locusta migratoria, the carrot fly Psila rosae (18), the cereal aphid Sitobion avenae (19), the Colorado beetle L. decemlineata (17), Leptinotarsa... 

Features The branched stems of one to three feet high are tough and bristly. The whole plant is hairy, and the leaves are oblong and bipinnate, with acute segments. Blossoming in June and July, the umbel of white flowers usually contains one crimson flower in the centre. The root tapers, is yellowish-white, sweetish, and faintly aromatic. Wren tells us that "in taste and odour it resembles the garden carrot, but the root is small and white, not large." Ferrier, however, says of this root, "no resemblance in taste or colour to the cultivated carrot." Our own opinion is that Wild Carrot tastes like a rather distant relative of the household carrot—which it probably is. 

Mars passes through the zodiac every two years and this sign was formerly used for biennials. The plants possess thorns, spines or prickles, grow in dry harsh areas and have acrid, pungent or stimulating odours for example. Raspberry or Red Pepper. They have a comical root (tap root) for example. Carrot, Beet. 

Carrot Daucus carrota Reported CO2 yields Major components Description Odour profile Minimum perceptible Flavour applications Fragrance applications... 

The aroma of carrots root Daucus carota, Apiaceae) is very complex. It consists of various aldehydes, ketones, mono- and sesquiterpenic hydrocarbons and other compounds. The important hydrocarbons are myrcene, sabinene, terpinolene, P-caryophyUene, y-bisabolene and a-pinene, which are present in the largest quantities. The significant carbonyl compounds are acetaldehyde and (2 ,6Z)-nona-2,6-dienal. One of the typical aromatic substances determining the basic odour of carrots is 2-sec-butyl-3-methoxypyrazine. During the cooking of carrots, the contents of methanal, ethanal, propanal, octanal, (Z)-dec-2-enal and some sulfur compounds, such as dimethylsulfide and ethanethiol, increase. At the same time, the contents of monoterpenes and P-caryophyUene decrease. 

Jones, O.T. T.H. Coaker. 1977. Oriented responses of carrot fly larvae, Psila rosae, to plant odours, carbon dioxide and carrot root volatiles. Physiol. Entomol. 2 189-197. 

Male sex pheromone of Ceratitis capitata (Mediterranean fruit fly). Present in tobacco and carrot leaves Daucus carota) (Umbelliferae). Widely distributed in trace amts., presumably as bacterial decarboxylation prod, of proline. Primary odour constit. of sperm. Widely used org. base, used in the prep, of enamines. Reagent used in the ms determination of the position of double bonds and of methyl branching in fatty acids. Liq. with odour resembling Piperidine. Misc. H2O. df 0.8618. Fp —63°. Bp 88.5-89°. Fumes in air. Strongly alkaline. 

---