- Citronellol fatty acid ester derivative and application and preparation method thereof
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The invention relates to a citronellol fatty acid ester derivative and an application and preparation method thereof. The citronellol fatty acid ester derivative is used as a transdermal absorption penetration enhancer for application and used for preparing a transdermal drug delivery preparation so that transdermal absorption of drugs can be improved, and the accumulative penetration amount of the drugs is increased. According to the citronellol fatty acid ester derivative, after reaction with thionyl chloride, fatty acyl chloride is prepared, then the fatty acyl chloride reacts with citronellol, and the citronellol fatty acid ester derivative is obtained. The citronellol fatty acid ester derivative can be applied to the transdermal drug delivery preparation, improves the penetration ability of the drugs, and can also be used as spice to mask the objectionable odor of the preparation.
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Paragraph 0043; 0044
(2017/12/09)
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- A clean enzymatic process for producing flavour esters by direct esterification in switchable ionic liquid/solid phases
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A clean biocatalytic approach for producing flavour esters using switchable ionic liquid/solid phases as reaction/separation media has been developed. The phase behaviour of different IL/flavour acetyl ester (geranyl acetate, citronellyl acetate, neryl acetate and isoamyl acetate) mixtures was studied at several concentrations, resulting for all cases in fully homogeneous liquid media at 50 °C, and solid systems at room temperature. By using an iterative centrifugation protocol on the solid IL/flavour ester mixtures at controlled temperatures, the solid IL phase and the liquid flavour ester phase can be easily separated. The excellent suitability of an immobilized Candida antarctica lipase B (Novozym 435) catalyst in the esterification reaction between an aliphatic carboxylic acid (acetic, propionic, butyric or valeric) and a flavour alcohol (isoamyl alcohol, nerol, citronellol or geraniol) in N,N′,N′′,N′′′-hexadecyltrimethyl-ammonium bis(trifluoromethylsulfonyl)imide ([C16tma][NTf2])IL has been demonstrated, the product yield being improved up to 100% under appropriate reaction conditions (enzyme amount, dehydrating molecular sieves, etc.) at 50 °C. The enzymatic synthesis of sixteen different flavour esters was carried out in [C16tma][NTf2] by means of this approach, providing products of up to 0.757 g mL-1 concentration after IL separation. The residual activity of the enzyme/IL system during seven consecutive operation cycles was shown to be practically unchanged after reuse.
- Lozano, Pedro,Bernal, Juana M.,Navarro, Alicia
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p. 3026 - 3033
(2013/01/15)
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- Reptilian chemistry: volatile compounds from paracloacal glands of the American crocodile (Crocodylus acutus).
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The secretion of the paracloacal glands of the American crocodile (Crocodylus acutus) contains over 80 lipophilic compounds, including saturated and unsaturated long-chain alcohols along with their formic, acetic, and butyric acid esters, and several isoprenoids. Most of these compounds were identified on the basis of mass spectra, obtained by GC-MS. In addition, identification of the major components was supported by infrared spectra obtained by GC-FTIR. Major differences are indicated in the composition of the paracloacal gland secretion of C. acutus and that of another crocodylid, the African dwarf crocodile (Osteolaemus tetraspis).
- Garcia-Rubio, Silvina,Attygalle, Athula B,Weldon, Paul J,Meinwald, Jerrold
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p. 769 - 781
(2007/10/03)
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- Lipase-catalysed transesterification using 2,2,2-trifluoroethyl butyrate: Effect of temperature on rate of reaction and enantioselectivity
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Temperature of the reaction and the solvent used markedly influenced the enantioselectivity and rate of transesterification reaction catalysed by Candida cylindracea between 2,2,2-trifluoroethyl butyrate (TFEB) and 3,7-dimethyl-6-octenol, and that between TFEB and 2,2-dimethyl-1,3-dioxolane-4-methanol.
- Parmar,Prasad,Singh,Gupta
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p. 1395 - 1398
(2007/10/02)
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- Process development for production of terpene esters using immobilized lipase in organic media
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Suitable engineering strategies for removal and control of water generated during the esterification of citronellol with butyric acid, using a commercial lipase preparation (Novo's lipozyme) are investigated.The system is investigated under batch conditions to provide background information on the kinetics, and the role of water.Modification of the hydration state of the lipozyme during the reaction is the most important factor in inhibiting the ester synthesis in consecutive batch runs.Dehydration of the recovered enzyme can restore the activity to levels similar to those achieved in the initial batch run.A comparison of the influence of different dehydration techniques on the repeated batch use of lipozyme for terpene esters synthesis is presented in this paper.
- Castro, H F de,Anderson, W A,Legge, R L,Moo-Young, M
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p. 891 - 895
(2007/10/02)
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