Amines with aromatic ring
P-14 P15 PI 6 PI 7 P.14 P.14 Benzenamine, aniline, phenylamine, benzenamine, phenylazane, aminobenzene 62-53-3 Identified in green coffee by Vitzthum et al. 1976 . In their study on the influence of brewing time on the composition of brewed coffee, Lee et al. 1992 qualified aniline of 'fast extractor' 70-80 extracted after 5 min . When absolutely pure, in suitable dilution, aniline has a warm, sweet and actually pleasant odor Arctander, 1967 . P.15 Benzenamine, A -methyl-, N-methylaniline...
Aromatic sulfides
Q.25 Benzene, methylthio -, methylsulfanyl benzene, methylthio benzene, methyl phenyl sulfide, thioanisole 100-68-5 FEMA 3873 Identified in roasted coffee flavor by Stoll et al. 1967 . At a concentration of 0.1 ppm it has a phenolic, quinoline, dirty flavor Chemisis, 1997 . Q.26 Phenol, 2- methylthio -, 2- methylsulfanyl phenol, 2- methylthio phenol, 2- methylmercapto phenol, o-hydroxythioanisole 1073-29-6J FEMA 3210 Identified by Stoll et al. 1967 . The flavor is described as burnt, phenolic,...
Other non functional furanic compounds
1.41 Furan, 2,2'- l,2-ethenediyl bis-, -, E -2,2'-vinylenebis furan , 2- 2E- 2-furyl ethenyl furan, ra . -di- 2-furyl ethylenc 1439-19-6 no stereochemistry 5416-79-5 1.42 Furan, 2,2'- l,2-ethenediyl bis-, Z -, Z -2,2'-vinylenebis furan , m-di- 2-furyl ethylcne 18266-93-8 These were identified by Silwar 1982 . The concentrations found by Silwar et al. 1987 were, respectively, 0.02-0-06 and 0.05-0.10 ppm. 1.43 1.43 Furan, 3-phenyl-, 3-phenylfuran 13679-41-9 Identified in roasted coffee volatiles...
Saturated aliphatic diacids
E.42 Ethanedioic acid, oxalic acid 144-62-7 Identified by Arbenz 1917 who reported the presence of 0.08 in roasted coffee. Mabrouk and Deatherage 1956 estimated its content at 0.20 by weight of roasted coffee beans 3.1 of the total acids present in coffee extracts . Lentner and Deatherage 1959 did not detect it and deduced that it may be present as the water-insoluble calcium salt. Feldman et al. 1969 found 250-500 ppm 0.025-0.05 in roasted arabica and robusta, the content being slightly lower...
Info Lvs
A.48 A.48 Benzene, benzene, benzol, cyclohexatriene 71-43-2 Identified by Heins et al. 1966 in a headspace analysis of commercial roasted beans and by Merritt et al. 1970 in green and roasted 400-430 F, ca 205-240 C beans. Silwar et al. 1987 gave a concentration of 0.10-0.15 ppm in roasted coffee. It is present in the analysis of Puerto Rico 'Rio' and healthy green beans simultaneous distillation-extraction, GC MS by Spadone et al. 1990 and in the green Mexican coffee analyzed by Cantergiani...
Organoleptic qualities and threshold values
Rahn and K nig 1978 recalled previous findings suggesting that phenols and other moderately acidic organic components could be responsible for the frequently observed nauseous symptoms of sensitive coffee drinkers. It was not known whether there is a specific component that is responsible for nausea. This was why they analyzed an ether extract of a coffee infusion, analysis of which allowed the identification of three new coffee constituents 3-methyl- H.26 , 4-ethyl- H.29 1,2-benzenediols and...
Saturated lactones
G.l G.l 2 3 -Furanone dihydro-, butano-4-lactone, tetrahydrofuran-2-one, 4-butanolide, 4-hydroxybutanoic acid lactone, 7-butyrolactone 96-48-0 FEMA 3291 Identified in roasted coffee after steam distillation and preparative GC by Viani et al. 1965 , Gianturco et al. 1966 , and Stoffelsma et al. 1968 , also by Gutmann et al. 1979 in headspace of green coffee and by Cros et al. 1980 in headspace of ground roasted Colombian coffee. Its concentration in roasted coffee was estimated at 4.7 ppm by...
Gcsnif Analysis
This sensorial analysis headspace-GC-sniffing has been developed by Pollien et al. 1997 . It is realized with panels of eight six as a minimum to ten members. Only one concentration level is needed. As in H ARM i analysis, the panelist presses a button as long as he can perceive the odor of a GC effluent. The time-dependent signal is continuously recorded by the computer. The individual aromagrams square signals are averaged. The mean aromagram is normalized. Independent panels generate similar...
Dilution Analysis Charm Analysis And Aroma Extract Dilution Analysis Aeda
A procedure based on the relative odor thresholds of volatile compounds with known GC retention indexes was proposed by Acree et al. 1984 , thus transforming the qualitative GC-O to a quantitative method by computerizing the observations. The concept of CHARM R analysis was systematically constructed from the idea of 'odor values'. It is a dilution-to-threshold technique. A flavor extract is injected into the chromatograph, and during the entire chromatogram, the tester presses a button each...
OH Skx
1.143 2 -Pyran, 3,4-dihydro-, 3,4-dihydro-2H-pyran, dihydropyran 110-87-2 Identified by Wang et al. 1983 as a trace compound in a coffee headspace, and by Liardon and Ott 1984 in an analytical study applying multivariate statistics for the classification of coffee headspace profiles. 1.144 2 -Pyran-3-ol, 6-ethenyltetrahydro-2,2,6-trimethyl-, cis-, m-linalool 3,7-oxide, linalool oxide D 14009-71-3 3R,cis- 24048-52-0 35,m- 22628-11-1 no stereochemistry 14049-11-7 1.145 2 -Pyran-3-ol,...
The Volatile Compounds Identified In Green Coffee Beans
In spite of careful examination of the published results, the number of chemicals identified in the volatiles of green coffee beans is difficult to calculate exactly. Figure 2.10 lists the four research groups that have been particularly active in the analysis of raw beans. Green coffee, which has a relatively faint but characteristic odor, has mainly been studied in order to appreciate the quality of the cultivated product and to detect, before roasting, any off-flavors present in defective...
Unsaturated aliphatic ketones
D.26 3-Buten-2-one, but-3-en-2-one, methyl vinyl ketone, l-buten-3-one 78-94-4 Identified by Sullivan et al. 1959 and by Merritt et al. 1963 who gave a concentration of 0.4 in their 'coffee aroma' see Section 5.B . Ramos et al. 1998 found it after extraction of a brewed arabica with supercritical C02. The odor is very sharp and pungent, rather irritating and penetrating, becoming sweet-ethereal, not unpleasant in extreme dilution Arctander, 1967 . D.27 3-Penten-2-one, -, E -pent-3-en-2-one,...
N Ntb
0.21 0.21 Pyrazine, trimethyl-, trimethylpyrazine, 2,3,5-trimethylpyrazine, 2,3,6-trimethylpyrazine 14667-55-1 FEMA 3244 Identified in roasted coffee flavor by Goldman et al. 1967 , in the headspace of a brew 0.04 , GC by Shimoda and Shibamoto 1990a , and in a brew liquid-liquid extraction, solid-phase microextraction by Ramos et al. 1998 . The concentration was estimated as 4.0 ppm by Stofberg and Stoffelsma 1981 , 8-10 ppm by Silwar et al. 1987 and was about 5 ppm for Hashim and Chaveron...
Info Imi
D.72 2-Cyclopenten-l-one, 2-hydroxv-3,4-dimethyl-, 3,4-dimethylcyclopenten-2-en-2-ol-l-one 21835-00-7 - 147770-82-9 1,2-cyclopentanedione, 13494-06-9 FEMA 3268 Identified by GC IR by Gianturco et al. 1963 . Nishimura and Mihara 1990 found a concentration of 0.73 ppm MS data given . It was prepared by Gianturco and Friedel 1963 by alkylation of diethyl followed by hydrolysis and decarboxylation. The flavor description is maple, fenugreek, burnt Chemisis, 1968 . The odor description is very...
Unsaturated aliphatic alcohols
B.26 2-Buten-l-ol, 2-methyl-, 2-methylbut-2-en-l-ol 4675-87-0 , tiglic alcohol, - 497-02-9 Z - 19319-26-7 Identified by Shimoda and Shibamoto 1990a in the headspace of brewed coffee peak area in GC 0.16 of the area of the volatiles . B.27 B.27 2-Buten-l-ol, 3-methyl-, 3-methylbut-2-en-l-ol, 3,3-dimethylallyl alcohol, prenol, prenyl alcohol 556-82-l FEMA 3647 Identified by Stoll et al. 1967 in a coffee aroma, by Stoffelsma et al. 1968 steam distillation and distillation, then GC and by Cros et...
Methoxypyrazines
The organoleptic significance of alkoxy and alkylthio pyrazines has been suggested in the patent literature prior to the appearance of any reports of their occurrence in nature or in cooked foodstuffs Firmenich amp Co, Patents, 1965, 1967 . Later, Buttery et al. 1969c reported the isolation, identification and synthesis of the first original and characteristic highly potent aroma component of bell pepper, 2-isobutyl-3-methoxypyrazine 0.77 green bell pepper must not be confused with 'poivre...
O Rvm
Baltes and Bochmann 1987a proposed this structure for a furanone, not identified in coffee, but present in model reactions, heating serine and threonine with sucrose MS data . 1.97 3 2 f -Furanone, 2,4-dimethyl-, 2,3-dihydro-2,4-dimethylfuran-3-one 37713-48-71 Identified by Silwar et al. 1987 who gave a concentration of 0.50-0.60 ppm. It has to be noted that, in this publication, only the 2,4-dimethyl isomer is mentioned, although Silwar 1982 only mentioned the 2,5-dimethyl-isomer 1.98, see...
J Thiophenes
In a review of the role of thiophenes in food flavor 1975b , Maga mentioned that the structure of thiophene was not resolved until 1882, although thiophene and its derivatives had been known to organic chemists since the mid-1800s. The real interest in this chemistry arose when the drug industry found that thiophene derivatives were useful intermediates in the production of antihistaminic drugs. During the Sixties, it was shown that these sulfur-containing heterocycles contributed to the...
Multivariate Sensory Analysis Msa And Statistical Treatments
Over the years, many attempts have been made to represent food volatile profiles. In order to find an objective method for evaluating food flavors, multivariate analysis has been widely used. In one of the earliest studies, Powers and Keith 1968 examined steam distillates of coffees with different flavors. They used stepwise discriminant analysis of the chromatograms to select the most critical peak ratios to be correlated with flavor. Although they recognized that the method has the advantage...
Alkenylfurans
1.19 Furan, 2-ethenyl-, 2-vinylfuran 1487-18-9 Identified see 1.15 by Vitzthum and Werkhoff 1976b MS data , and by Silwar et al. 1987 who found a concentration of 0.02-0.05 ppm in a roasted arabica see 1.2 . It represented 0.17 in GC of the headspace of roasted coffee for Shimoda and Shibamoto 1990a . It was formed from the thermal degradation of glucose Heyns et al., 1966a Fagerson, 1969 . Baltes and Bochmann 1987a found 2-and 3-vinylfurans in model reactions involving serine, threonine and...
Modern Times The Advent Of Gas Chromatography
From 1956, gas chromatography GC was introduced as a separation technique, and throughout the sixties, identification systems like mass spectrometry MS and nuclear magnetic resonance NMR progressively equipped analytical laboratories. The use of these instruments has dramatically accelerated the identification of volatile food constituents. Including the previous noteworthy contribution of Reichstein and Staudinger 1926a,b , 10 outstanding research groups have actively participated, mainly...
Anhydrides
E.63 2,5-Furandione, 2,5-dihydrofuran-2,5-dione, maleic anhydride, maleic acid anhydride 108-31-6 Identified by Kallio et al. 1989 among 41 constituents of a coffee headspace. The authors measured the changes of some volatiles of coffee during aging at 39 C and observed that the concentration of maleic anhydride diminished rapidly with time and that it had almost disappeared after 120 days of storage. Ramos et al. 1998 could identify it after liquid-liquid extraction of a brewed arabica with...
O Kfi
C.37 Ethanedial, glyoxal, glyoxaldehyde, ethanedione, oxalaldehyde, biformal 107-22-2 Identified by Aeschbacher et al. 1989 in roasted coffee aroma. According to Hayashi and Namiki 1986 , glyoxal and methylglyoxal C.38 result from sugar fragmentation and are formed in the initial stages of browning. C.38 Propanal, 2-oxo-, 2-oxopropanal, pyruvaldehyde, 1,2-propanedione, acetylformaldehyde, methylglyoxal, pyruvic aldehyde 78-98-8 FEMA 2969 Identified by Walter et al. 1967 as the...
CHO Bty
1.63 1.63 2-Furancarboxaldehyde, 2-furaldehyde, furan-2-carbaldehyde, furfural, furfurol, furanal, 2-formylfuran, pyromucic aldehyde 98-01-1 FEMA 2489 Identified by Jaeckle 1898 . Its presence was also reported by Reichstein and Staudinger 1926b . Prescott et al. 1937a,b identified it as its dimethyl dihydroresorcinol condensation product and observed that it promptly underwent decomposition with the formation of tarry materials. The presence of 2-furaldehyde has also been confirmed by...
Books Reviews And Meetings On Coffee Flavor
The research on coffee chemistry has been particularly active during the last 50 years and the scientific literature on the subject is extensive. The content of this monograph is limited to the identification and the characteristics of the compounds present in the volatiles of green and roasted coffees. The mechanisms of formation of the flavor during roasting will not be extensively developed, the browning reactions having been the subject of numerous publications and meetings mentioned in the...
Info Whn
phosphoric, sulfuric, silicic acids and chlorine traces phosphoric, sulfuric, silicic acids and chlorine traces 1844 assamar but 'got stuck' without success in an unbelievable series of analyses of caramels of various shades of brown and difficult to identify. In 1858, Vlaanderen and Mulder claimed to have isolated from Jara coffees 'Kaffeesaure' C14H8O7 and acids from its transformations one 'Kaffeansaure' C HgOg and two 'Coerulinsauren' CuHgOi , C14H7O8 , and 'Kaffeelsaure' Ci4H8Oi2 . Since...
Info Ors
OOOr j- DOCOtN T OOOOiN J- sDOOOfN OOOO I O O O O Ot t t t ooooococcoo o o o 0s. O . 0s O 0s 0s O O . O 0s 0s o Fig. 5.1 Progressive identification of hydrocarbons in roasted coffee volatiles listed as 'an octane, an octene, an octyne ' In such a case the identification cannot be considered as definitive, but, in a subsequent publication, Merritt et al. 1970 listed saturated and unsaturated homologues from C6 to Cn in such a manner that the reader cannot deduce the actual structure, doubt...
co
Ethyl acetate is with 2-butanone one of the main aliphatic volatile compounds that Zhang and Ho 1991 identified after thermal interaction of cysteine and glucose. When pure, it is a clear, volatile, narcotic, flammable liquid, overexposure to which can irritate eyes, nose and throat it has a pleasant, ethereal-fruity, brandy-like odor, somewhat nauseating in high concentration Arctander, 1967 . The odor threshold given by Flath et al. 1967 was 5ppm probably in water , and by Mulders 1973b 6.2...
Odor Activity Value Oav Or Odor Unit Or Aroma Value Or Flavor Unit
The importance of minor components in flavors and fragrances has been emphasized and discussed by Ohloff 1977 , the author referring to the concept of 'odor value', a first approach to bringing to light the contribution of a compound to the flavor of a particular food. The 'aroma value' was proposed in 1963 by Rothe and Thomas as the ratio of the concentration of a volatile compound to its odor threshold. The concept was also used by Guadagni et al. 1966 and Mulders 1973b , and expanded in...
Y
F.25 F.25 Propanoic acid, methyl ester, methyl propionate, methyl propanoate 554-12-1 FEMA 2742 Identified by Heins et al. 1966 in the headspace of coffee beans by one of the first capillary-GC MS coupling, in spite of the fact that the experimental conditions and the resolution were still of relatively poor quality. The number of certified identifications was consequently strongly reduced. Merritt et al. 1970 found it in headspace of green and of roasted coffee. Wang et al. 1983 mentioned it...
N 1
some nicotinic acid Section 5,N.24 which is found in green coffee at low levels, 16-44 ppm. The increase in the content of nicotinic acid 150-200 ppm for medium roast represents only a small part of the loss in trigonelline see Section 5,N.24 . The thermal fragmentation of trigonelline has been carefully studied by Viani and Horman 1974 , using GC MS and TLC analytical methods. Important aroma constituents, such as pyridines, pyrroles, methyl nicotinate Section 5,N.25 , are actually formed and...
Bicyclic lactones
G.14 2 4 -Benzofuranone, 5,6,7,7a-tetrahydro-4,4,7a-trimethyl-, dihydroactinidiolide, 15356-74-8 R - 17092-92-1 Identified in green coffee by Vitzthum et al. 1976 , and by Cantergiani et al. 2001 in a green Mexican arabica where it represented 0.10 GC of the volatiles obtained after vacuum hydrodistillation and extraction. It may be formed in vivo from 3-carotene by a mechanism similar to photooxygenation, according to Isoe et al. 1969 . It has been found in black tea aroma and is formed...
Q Q
1.31 2,3'-Bifuran, 2,3'-bifuryl, 2,3'-bifuran 27521-86-4 or 1.32 3,3'-Bifuran, 3,3'-bifuryl, 3,3'-bifuran 13803-57-1 This was identified by Silwar 1982 , and Silwar et al. 1987 found a concentration of 0.01-0.02 ppm. 1.33 2,2 -Bifuran, 5-methyI-, 5-methyl-2,2'-bifuran, 2- 2-furyl -5-methylfuran 16303-61-0J Identified by Baltes and Bochmann 1987a MS data given . It was found by these authors only in reaction of serine and not threonine with sucrose. 1.34 Furan, 2,2'-methylenebis-,...
2-butanone Aroma
F.18 Methanol, methoxy-, acetate, methoxymethyl acetate, 'ac tate de m thylm thoxy' 4382-76-7 Identified by Guyot et al, 1982, 1983 with a low concentration in stinking green coffee and and even lower concentration in healthy green beans. F.19 2-Propanone, l- acetyloxy -, 2-oxopropyl acetate, l-acetoxy-2-propanone, 1-hydroxy-2-propanone acetate, acetylmethyl acetate, acetol acetate, 0-acetylacctol, acetoxyacetone 1592-20-1 Identified by Viani et al. 1965 , the structure was confirmed by...