Nicotiana species of the section Alatae characteristically emit the floral scent compounds of the ＇cineole cassette＇ comprising 1,8-cineole, limonene, myrcene, α-pinene, β-pinene, sabinene, and α-terpineol. We su...Nicotiana species of the section Alatae characteristically emit the floral scent compounds of the ＇cineole cassette＇ comprising 1,8-cineole, limonene, myrcene, α-pinene, β-pinene, sabinene, and α-terpineol. We successfully isolated genes of Nicotiana alata and Nicotiana langsdorfii that encoded enzymes, which produced the characteristic monoter- penes of this ＇cineole cassette＇ with α-terpineol being most abundant in the volatile spectra. The amino acid sequences of both terpineol synthases were 99% identical. The enzymes cluster in a monophyletic branch together with the closely related cineole synthase of Nicotiana suaveolens and monoterpene synthase 1 of Solanum lycopersicum. The cyclization reactions （α-terpineol to 1,8-cineole） of the terpineol synthases of N. alata and N. langsdorfii were less efficient compared to the ＇cineole cassette＇ monoterpene synthases of Arabidopsis thaliana, N. suaveolens, Salvia fruticosa, Salvia officinalis, and Citrus unshiu. The terpineol synthases of IV. alata and N. langsdorfii were localized in pistils and in the adaxial and abaxial epidermis of the petals. The enzyme activities reached their maxima at the second day after anthesis when flowers were fully opened and the enzyme activity in N. alata was highest at the transition from day to night （diurnal rhythm）.展开更多
Terpenoids have drawn much attention to scientists in synthesizing high-performance bio-jet fuels due to their ring structures,which feature potential high densities.Here,a facile biphasic catalytic process has been d...Terpenoids have drawn much attention to scientists in synthesizing high-performance bio-jet fuels due to their ring structures,which feature potential high densities.Here,a facile biphasic catalytic process has been developed for the production of high-density tricyclic hydrocarbon biofuels from a monoterpenoid,1,8-cineole,using sulfuric acid(H2SO4)as the homogeneous catalyst.A^100%conversion of 1,8-cineole and a>40%carbon yield of cyclic dimers were achieved at 100℃within two hours.The mechanism for the acid-catalyzed conversion of 1,8-cineole to cyclic hydrocarbon dimers were explored.In particular,the formation of the diene intermediates and the following dimerization of dienes was essential to synthesize tricyclic terpene dimers.The biphasic catalytic process accelerated the deoxygenation rate and enabled the dimerization with the aid of organic solvent while controlling the reaction rates to avoid the formation of solid residues.Moreover,this process also facilitated the product separation by organic solvent extraction while enabling easy recycle of the homogenous catalysts.展开更多
Essential oil of Amomum subulatum is the complex mixture of various alkyl, alkanes, sulfonates, amines, alcohols, sulfoxides, trans RCH≡CHR and aromatic bending compounds. The FT-IR analysis of aromatic bending occur...Essential oil of Amomum subulatum is the complex mixture of various alkyl, alkanes, sulfonates, amines, alcohols, sulfoxides, trans RCH≡CHR and aromatic bending compounds. The FT-IR analysis of aromatic bending occurs on 845 cm-1 with para C-H bend. A strong absorption band between 900 cm-1 - 675 cm-1 indicated the presence of aromatic C=C. The alcoholic stretching detected on 1080 cm-1 and 1169 cm-1 with C-O stretching molecular motion in large cardamom. In our investigation, the frequency of 2943 cm-1 and 2934 cm-1 the C-H stretching occurred in alkyl group. The wave numbers of bands 2966 (C=CH2), 1358 (S=O Stretch), 1215 (C-N Stretch), 1053 (S=O Stretch) and 984 (C-H Bending) the functional group specify vinyl, sulfonates, amines, sulfoxides and trans RCH-CHR, respectively.展开更多
The essential oil from Melaleuca leucadendra L.leaves has been widely used as a perfume and traditional remedy,cosmetics and pharmaceutical products ingredient since many years ago.The common technology to recover the...The essential oil from Melaleuca leucadendra L.leaves has been widely used as a perfume and traditional remedy,cosmetics and pharmaceutical products ingredient since many years ago.The common technology to recover the oil is hydro-distillation and steam-distillation.However,all oil can not be fully extracted from the leaves by this method due to the recalcitrant structure of leaves that hindrance the access of the solvent.Adding a submerged fermentation as a pretreatment step prior to the extraction process helped to loosen the lignocellulose structure and enhance oil release in the extraction process.In this study,the raw materials were collected from the natural forest in Buru Island,Maluku,Indonesia.The biological agents applied in these processes were Phanerochaete chrysosporium ITBCC136 and Trichoderma viride ITBCC143.The oil extraction process was conducted by method of steam-distillation,the oil was analysed using gas chromatography-mass spectroscopy(GC-MS),and the lignocellulose content in the biomass was measured by the fractionation method.The treatment using T.viride provided the highest increase in yield percentage up to 3.47%as compared with control of 1.45%,with the lowest percentages of the remained cellulose,while the fermentation with the presence of P.chrysosporium did not affect the oil yield even the lignin content was decrease as much as 21%.The percentages of 1,8-cineole in the oil were almost unchanged,which was about 20%of the oil.展开更多
文摘Nicotiana species of the section Alatae characteristically emit the floral scent compounds of the ＇cineole cassette＇ comprising 1,8-cineole, limonene, myrcene, α-pinene, β-pinene, sabinene, and α-terpineol. We successfully isolated genes of Nicotiana alata and Nicotiana langsdorfii that encoded enzymes, which produced the characteristic monoter- penes of this ＇cineole cassette＇ with α-terpineol being most abundant in the volatile spectra. The amino acid sequences of both terpineol synthases were 99% identical. The enzymes cluster in a monophyletic branch together with the closely related cineole synthase of Nicotiana suaveolens and monoterpene synthase 1 of Solanum lycopersicum. The cyclization reactions （α-terpineol to 1,8-cineole） of the terpineol synthases of N. alata and N. langsdorfii were less efficient compared to the ＇cineole cassette＇ monoterpene synthases of Arabidopsis thaliana, N. suaveolens, Salvia fruticosa, Salvia officinalis, and Citrus unshiu. The terpineol synthases of IV. alata and N. langsdorfii were localized in pistils and in the adaxial and abaxial epidermis of the petals. The enzyme activities reached their maxima at the second day after anthesis when flowers were fully opened and the enzyme activity in N. alata was highest at the transition from day to night （diurnal rhythm）.
文摘Terpenoids have drawn much attention to scientists in synthesizing high-performance bio-jet fuels due to their ring structures,which feature potential high densities.Here,a facile biphasic catalytic process has been developed for the production of high-density tricyclic hydrocarbon biofuels from a monoterpenoid,1,8-cineole,using sulfuric acid(H2SO4)as the homogeneous catalyst.A^100%conversion of 1,8-cineole and a>40%carbon yield of cyclic dimers were achieved at 100℃within two hours.The mechanism for the acid-catalyzed conversion of 1,8-cineole to cyclic hydrocarbon dimers were explored.In particular,the formation of the diene intermediates and the following dimerization of dienes was essential to synthesize tricyclic terpene dimers.The biphasic catalytic process accelerated the deoxygenation rate and enabled the dimerization with the aid of organic solvent while controlling the reaction rates to avoid the formation of solid residues.Moreover,this process also facilitated the product separation by organic solvent extraction while enabling easy recycle of the homogenous catalysts.
文摘Essential oil of Amomum subulatum is the complex mixture of various alkyl, alkanes, sulfonates, amines, alcohols, sulfoxides, trans RCH≡CHR and aromatic bending compounds. The FT-IR analysis of aromatic bending occurs on 845 cm-1 with para C-H bend. A strong absorption band between 900 cm-1 - 675 cm-1 indicated the presence of aromatic C=C. The alcoholic stretching detected on 1080 cm-1 and 1169 cm-1 with C-O stretching molecular motion in large cardamom. In our investigation, the frequency of 2943 cm-1 and 2934 cm-1 the C-H stretching occurred in alkyl group. The wave numbers of bands 2966 (C=CH2), 1358 (S=O Stretch), 1215 (C-N Stretch), 1053 (S=O Stretch) and 984 (C-H Bending) the functional group specify vinyl, sulfonates, amines, sulfoxides and trans RCH-CHR, respectively.
文摘The essential oil from Melaleuca leucadendra L.leaves has been widely used as a perfume and traditional remedy,cosmetics and pharmaceutical products ingredient since many years ago.The common technology to recover the oil is hydro-distillation and steam-distillation.However,all oil can not be fully extracted from the leaves by this method due to the recalcitrant structure of leaves that hindrance the access of the solvent.Adding a submerged fermentation as a pretreatment step prior to the extraction process helped to loosen the lignocellulose structure and enhance oil release in the extraction process.In this study,the raw materials were collected from the natural forest in Buru Island,Maluku,Indonesia.The biological agents applied in these processes were Phanerochaete chrysosporium ITBCC136 and Trichoderma viride ITBCC143.The oil extraction process was conducted by method of steam-distillation,the oil was analysed using gas chromatography-mass spectroscopy(GC-MS),and the lignocellulose content in the biomass was measured by the fractionation method.The treatment using T.viride provided the highest increase in yield percentage up to 3.47%as compared with control of 1.45%,with the lowest percentages of the remained cellulose,while the fermentation with the presence of P.chrysosporium did not affect the oil yield even the lignin content was decrease as much as 21%.The percentages of 1,8-cineole in the oil were almost unchanged,which was about 20%of the oil.
