Pear-like

Observable Characteristics - Physical State (as normally shipped) Liquid Color Colorless to yellow Odor. Pleasant banana-like mild characteristic banana- or pear- like odor ... 

Problems Pear ester (43) is an important industrial flavouring compound with a pear-like taste and smell. Consider all possible Wittig disconnections and choose a reaction which should give the right geometrical isomer. 

Clear, colorless liquid with a banana or pear-like odor. Odor threshold concentration is 7 ppm (quoted, Keith and Walters, 1992). A detection odor threshold concentration of 18 pg/m (3.4 ppbv) was determined by Katz and Talbert (1930). 

Clear, colorless, flammable liquid with a pleasant, pear-like odor. Experimentally determined detection and recognition odor threshold concentrations were 200 pg/m (48 ppbv) and 600 pg/m (140 ppbv), respectively (Heilman and Small, 1974). An odor threshold concentration of 240 ppbv was determined by a triangular odor bag method (Nagata and Takeuchi, 1990). Cometto-Muniz and Cain (1991) reported an average nasal pungency threshold concentration of 17,575 ppmv. 

Pears, like apples, are as a rule not self-fertile. Good pollination is therefore very important. Observations have shown that Conference, for example, gives better-shaped fruit when Doyenne du Comice is present as the pollinator. Table 3.10 gives a rough guide to possible pollinators. Certainly there are a number of other cultivars which could be considered as potential pollinators, e.g. Comtesse de Paris, but most of them are difficult to market. 

Sapotilla, Chico (Achras sapota) is the fruit of the chicle tree, the source of the natural chewing gum base. The fruit has a very sweet taste with a pear-like, soft structure. The flavour is reminiscent of a mixture of pear with hazelnut. 

Ripe guavas develop such a powerful odour that a whole room can be perfumed by their smell. The taste varies according to its degree of ripeness from sour, green, harsh, over fresh, fruity pineapple and pear like to spicy, cinnamon, creamy, quincelike with some astringent aspects. 

CIC The powerful odour is dominated by 2-isobutyl thiazole and 3-pentanethiol. The green notes are lipid degradation products like (E)-2-hexenal, hexanal and higher unsaturated aldehydes, the pineapple-pear like fruity notes are derived from methyl hexanoate, ethyl-2-hexenoate and hexyl acetate. The spicy cinnamon notes are represented by 3-phenyl propyl acetate, cinnamyl acetate, methyl cinnamate, ethyl cinna-mate and ciimamaldehyde. Gamma-decalactone and 2,5-dimethyl-4-hydroxy-furan-3(2H)-one and 3-hydroxy-2-butanone add the sweet, creamy body. Beta-famesene, citronellol, 2-phenylethanol, beta-ionone add the sweet, floral, quincelike part and methyl benzoate and ethyl benzoate impart a characteristic medicinal, exotic topnote. 

Because of its sweet taste sucrose is consumed in large amounts. The perception of sweetness is mediated by taste buds submerged in the tongue and oral mucous membranes. The taste bud, a pear-like organ, consists of sensory cells (taste cells) interwoven with a branching network of nerve fibers. The taste bud contains two additional cell types basal and supporting cells. Sensory cells have a short life span of about 10 days, and new cells are derived from basal cells that continually undergo mitosis. Sensory... 

Hexanedione has a powerful, creamy-sweet, heavy-buttery, oily odor, yet somewhat milder than diacetyl. The odor is often classified as quinone-like . The taste is buttery-cheesy, particularly in acid medium (Arctander, 1967). The flavor is fatty, fruity, pear-like (Chemisis, 1961). 

Like the lower homologs 1.108 and 109, this ester was identified by Baltes and Bochmann (1987a). According to Winter et at. (1976e), at a concentration of 10 ppm in a syrup base, it has a pear-like taste a bitter, nutty note being perceived when tasted, at 7 ppm, in a neutral soluble coffee base. The flavor is also described as fruity, green, pear, fresh-refreshing (Chemisis, 1998). 

They arc far from being all spherical, many bebg shaped like pears, and must be picked. This is done by a very ingenious contrivance. The whole is sifted on the upper end of a long, smootii, inclined plane, and the grains roll down to the lower end. But tlie pear-like shape of the bad grabs makes them roll down irregularly, and they... 

Colorless, neutral liq pear-like odor and taste. dJJ 0.876. Pure isoamyl acetate bp 142. ng 1.400 the ordinary grade of commerce boils between 120-145. Flash pt, closed cup 92 F (33 C) open cup 100 F (38 C). Sol in 400 parts water miscible with alcohol, ether, ethyl acetate, amyl alco -hoi. Soly of water in isoamyt acetate (25 ) 1.6% by volume. 

Colorless liq aromatic pear-like odor. djf 0.866. bp 179. Slightly sol in water miscible with alcohol, ether. 

Peranat [Henkel/Emery/Cospha] Ruity, pear-like aroma chemical... 

C. Ethchlorvynol has a pungent odor sometimes described as pear-like, and gastric fluid often has a pink or green color depending on the capsule form (200- and 500-mg capsules are red 750-mg capsules are green). 

Features Apple, banana, berry, peach, pear-like flavor... 

Features Sweet peach, pear-like flavor Regulatory FDA 21CFR 172.515 FEMA GRAS Manuf/Distiib. Aldrich http //www.sigma-... 

Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke and fumes Uses Solvent for cellulosic and acrylic coatings synthetic flavoring agent in foods and pharmaceuticals fragrance in cosmetics Features Sweet apple, cherry, pear-like flavor Regulatory FDA 21CFR 172.515 FEMA GRAS Manuf./Distrib. Advanced BioTech http //www.adv-bio.com] Advanced Synthesis Tech, http //www.advancedsynthesis.com]... 

Properties Sweet floral odor pear-like taste m.w. 174.24 flash pt. (CC) > 130C Uses Fragrance flavor Manuf./Distrib. Cooke Aromatics Pty. Ltd http //WWW. cookearomatics. com.au,... 

Properties Colorless to pale yel. liq. fersh floral bergamot fruity pear-like odor m.w. 210.32 flash pt. 83 C... 

Formula CH3(CH2)2COOCH2CH2CH(CH3)2 Properties Colorless liq. strong fruity pear-like odor sol. in alcohol, fixed oils, mostorg. soivs. si. sol. in water insol. in glycerin, propylene glycol m.w. 158.24 dens. 0.860 b.p. 184-185 C flash pt. 149 F ref. index 1.409-1.414 Toxicology LD50 (oral, rat) > 5 g/kg, (skin, rabbit) > 5 g/kg primary skin irritant TSCA listed... 

Classification Sat. aliphatic carboxylic acid ester Definition Ester of propyl alcohol and acetic acid Empirical C5H10O2 Formula CH3COOCH2CH2CH3 Properties Colorless liq., pear-like odor sol. in alcohols, ketones, esters, hydrocarbons, diethyl ether, castor oil, linseed oil mod. sol. in water ... 

Properties Colorless liq.. It. strawberry apple-/pear-like odor sol. in alcohol insol. in water m.w. 180.21 dens. 1.0744 b.p. 236 C ref. index... 

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