The sharp and strong absorption in the range of 1300~1000 [cm.sup.-1] displayed the stretching vibration of pyranoid ring, so that JP1 were pyranose.
Wavenumber ([cm.sup.-1]) Strength Functional group 3000-3500 Strong O-H stretching vibration Near 2900 Weak C-H stretching vibration 1600-1730 Medium C=O stretching vibration 1400-1200 Medium C-H deviational vibration 1300-1000 Strong Stretching vibration of pyranoid ring Near 810 and 870 Weak Mannose Wavenumber ([cm.sup.-1]) Indication 3000-3500 Degree of methylation Near 2900 Characteristic peak of saccharides 1600-1730 Existence of acetyl 1400-1200 Characteristic peak of saccharides 1300-1000 Pyranoid ring Near 810 and 870 Characteristic peak of mannose
Authentic standards of linalool, (E)-linalool oxide A (furanoid), (Z)-linalool oxide B (furanoid), (E)-linalool oxide C (pyranoid
), geraniol, citral, [beta]-myrcene, D-limonene, [beta]-ocimene, nerol, nerolidol, [beta]-ionone, geranyl acetone, naphthalene, (Z)-3-hexen-1-ol, eugenol, nonanal, benzyl alcohol, benzene acetaldehyde, methyl salicylate, (Z)-3-hexenol acetate, 3-octen-1-ol, indole, and ethyl decanoate were purchased from Sigma-Aldrich (Shanghai, China).
A peak was observed in 2917cm-1 due to the asymmetric stretching vibration of C-H in pyranoid
ring, while the stretching of 1057-1033 cm-1 represent the C-O-C bond of the cyclic alcohol of cellulose .
Other products of the metabolization of linalool (143), amounting to less than 10% of those identified, were the corresponding (Z)-isomer (145), 2-vinyl-2-methyltetrahydrofuran-5-one (146), the four (E) and (Z) linalool oxides in their furanoid (147, 148) and pyranoid
(149, 150) forms, the (E) and (Z) acetates of pyranoid
linalool oxides (151,152), as well as 3,9-epoxy-p-menth-1-ene (153) (Scheme 41).
Monosaccharides exist mainly as pyranoid
and furanoid forms, the former being more stable .
Linalool oxide (pyranoid) (see also Linalool oxides)
Linalool oxide acetate (pyranoid)(2,6,6-Trimethyl-2-vinyl-4-
(E)-Linalool oxide acetate (pyranoid) ((E)-2,6,6-Trimethyl-2-
Winemakers have become so fearful of getting even a tiny whiff of pyrazine they have been called "pyranoid
" by one industry observer.
0.47 Trans-linalool oxide (pyranoid
) 0.53 Terpinen-4-ol 0.14 p-Cymenol 0.12 Alpha-terpineol 0,33 3E-hexenylbutanoate 0.36 3-Decanol 0.1 Trans-carveol 0.06 Nerol 0.06 Neral 0.06 Ceraniol 1.56 Geranial 0.21 1-Decanol 0.14 Isobornyl acetate 0.14 8-HidroxyIinalool 0.12 Geranyl formate T Cispinocarvvl acetate 0.12 Neryl acetate 0.06 Geranyl aceiate 5.82 Dodecanal 0.05 Cyclogeranyl acetate 0.06 Total identified 97.5 Germ tube formation
The organic fraction of a biooil produced from mixed biomass of wheat and wood sawdust was isolated by supercritical C[O.sub.2] (SC-C[O.sub.2]), and the first fraction of SC-C[O.sub.2] extraction collected at 25 MPa was enriched with furanoids (9.9%), pyranoids
(9.0%), and benzenoids (44.8%) .