Main scent

While perfumes may be simple or complex, they all consist of three principle ingredients the main scent, secondary or blender scents, and a fixative. The main scent is usually potent, and is balanced by the secondary scents added to it. The fixative is a compound that holds the whole thing together. Some fixatives work best for certain scents. The example, the best fixative for lavender scent is orris root. 

Figure 2 illustrates the experimental setup employed for in vivo and in vitro flower scent sampling and the chromatographic profiles (total ion current) obtained. A total of 40 compounds were identified in Sansevieria trifasdata flower scent and their relative amounts changed during the day. There is no single, dominant component of the scent. Aldehydes (hexanal, heptanal, heptenal, nonanal, octenal, nonadienal, decanal), alcohols, ketones (6-methyl-5-hepten-2-one, 3-octen-2-one), acetates (benzyl, hexyl, octyl, 2-ethyl-l-hexyl, decenyl, decyl, dodecenyl, dodecyl and tetradecenyl), methyl and benzyl benzoate, methyl salicilate, eugenol, and ds,frflns-a-farnesene, were identified as the main scent constituents. 

Although esters are quite commonly used in scratch and sniff adverts (they are micro-encapsulated, and your fingernail breaks open the capsules) and air fresheners, they are not widely used in perfumery. The moisture in human skin results in hydrolysis of the esters the alcohol portion may largely evaporate, but the acids remain, and many have a most unpleasant scent butanoic acid is the main scent from rancid butter. 

The main components of a skunk s scent fluid are 3-methyl-1-... 

In a phenol, a hydroxyl group is attached directly to an aromatic ring. The parent compound, phenol itself, Cr,HsOH (4), is a white, crystalline, molecular solid. It was once obtained from the distillation of coal tar, but now it is mainly synthesized from benzene. Many substituted phenols occur naturally, some being responsible for the fragrances of plants. They are often components of essential oils, the oils that can be distilled from flowers and leaves. Thymol (5), for instance, is the active ingredient of oil of thyme, and eugenol (6) provides most of the scent and flavor of oil of cloves. 

Pine resin, namely rosin or colophony, is one of the most widespread diterpenoid resins and has been used for waterproofing, for treating wood and paper, as varnish, as incense and as an ingredient in scented ointments. The main compounds present in fresh Pinaceae resins... 

In the present study, we investigate whether the age of the subject and the scent donor affects the amount of time an individual self-grooms in response to the odors of opposite-sex conspecifics. In doing so, we have two main objectives. The first objective is to test the hypothesis that age of the groomer affects the amount of time that it spends self-grooming in response to odors of opposite-sex conspecifics (experiment 1). The second objective is to test the hypothesis that age of the scent donor affects the amount of time opposite-sex conspecifics self-groom when exposed to its odors (experiment 2). 

Recently, Rosell and Sundsdal [78] tentatively identified 21 of the 43 constituents present in 96 scent marks deposited directly on snow or ice mounds by the Eurasian beaver, C. fiber. In this study, a higher final oven temperature was employed and several steroids were eluted from the capillary column. Because the main focus of this study was to determine whether the beaver uses castoreum and/or anal gland secretion for scent marking and not the full chem-... 

Wisteria sinensis below) needs to be pruned in two stages. In summer, when the main growing season is over, the new shoots are pruned back by about half. In winter these shoots are then further shortened to two buds. This may seem elaborate, but will give much joy when the heavily scented trusses of delicate lilac flowers appear the following spring. 

The GOBPs mainly found in the female moth antennae seem to carry odorant molecules found in plant volatiles (Steinbrecht et al., 1995). In the honeybee, Apis mellifera, ASP2 (AmelOBP2) expressed in the antennae of workers and drones can bind odorant molecules of floral scents such as 1,8-cineol, 2-isobutyl-3-methoxypyrazine, 2-heptanone and isoamyl-acetate but do not bind pheromone components (Danty et al., 1997, 1999 Briand et al., 2001). 

The Saga of Spherical Dendrimers On the Scent of Cyclophosphazenic Dandelions [J.-F. Labarre, F. Sournies, F. Crasnier, M.-C. Labarre, C. Videl, J.-P. Faucher, M. Graf-feuil, Main Group Chem. News 1995, 3, 4-8]. 

The main essential oil-producing species of Eucalyptus include Eucalyptus globulus, also called blue gum eucalyptus Eucalyptus dives, known as broadleaved peppermint eucalyptus Eucalyptus citriodora, known as lemon-scented eucalyptus Eucalyptus radiata, known as narrow-leaved peppermint gum Eucalyptus smithii, known as gully gum and Eucalyptus polybractea, known as blue mallee. Within each species there are many subspecies and chemo-types. This illustrates a very complex situation, producing essential oils with varying compositions and properties. 

Originally isolated and characterized from the petals of Clarkia breweri, salicylic acid carboxyl methyltransferase (SAMT), converts salicylic acid to methylsalicylate.14 Methysalicylate, a volatile ester, has a characteristic wintergreen scent Apart from its putative role in defense, methylsalicylate is an important chemoattractant for moth-pollinated flowers and one of the main volatiles released from Clarkia breweri flowers.44,55 SAMT is a member of the type 3 family of plant MTs. Similarly to the previously discussed families of methyltransferases, type 3 MTs are homodimeric proteins. 

The odor of thiols is their strongest characteristic. Skunk scent is composed mainly of 3-methylbutane-l-thiol and but-2-ene-l-thiol, with small amounts of other thiols. Ethanethiol is added to natural gas (odorless methane) to give it the characteristic gassy odor for detecting leaks. 

In the 1970s it was supposed that the characteristic sharp fruity scent and flavour of grapefruit came mainly if not entirely from a simple bicyclic enone called nootkatone. There was quite a rush to synthesize this compound in various laboratories and a remarkable feature of many successful syntheses was the use of fragmentation reactions. We shall describe parts of three syntheses involving the fragmentation of a six-, a four-, and a three-membered ring. 

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