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排序方式: 共有59条查询结果,搜索用时 31 毫秒
1.
Philip E. Sonnet Thomas A. Foglia Stephen H. Feairheller 《Journal of the American Oil Chemists' Society》1993,70(4):387-391
The fatty acid selectivity of several commercial lipases was evaluated in the hydrolysis of high-erucic acid rapeseed oil
(HEARO). The lipase ofPseudomonas cepacia catalyzed virtually complete hydrolysis of the oil (94–97%), while that ofGeotrichum candidum discriminated strongly against erucic acid, especially in esterification. A two-step process is suggested for obtaining a
highly enriched erucic acid in which theG. candidum lipase is employed to selectively esterify the fatty acid residues of unsaturated C-18, and shorter chain acids, from a mixture
of HEARO fatty acids obtained from total hydrolysis of the oil withP. cepacia lipase. 相似文献
2.
Philip E. Sonnet Edwin G. Piotrowski William B. Wise Thomas J. Micich 《Journal of the American Oil Chemists' Society》1986,63(12):1579-1583
Oxyethylated amides that are good wetting agents have been prepared as mixtures by allowing amides to react with ethylene
oxide under base catalysis. Individual components of such mixtures can be synthesized by allowing 1-alkylaziridines to react
with p-toluenesulfonic acid in monomethylethers of di-, tri- and tetraethylene glycol used as solvents. The aminoethers are
then acylated, and the methylether group is removed with trimethylsilyliodide from the resulting amide ethers. The sequence
should allow the synthesis of specific wetting agents of quite varied structure (alkyl, aryl groups) with an option for isotopic
labeling for more detailed analysis of the wetting properties. 相似文献
3.
The responses ofMicroplitis croceipes (Cresson) andMicroplitis demolitor Wilkinson to theR andS stereoisomers of the kairomone 13-meth-ylhentriacontane were evaluated. Singly and in combination at 5, 50-, and 500-ng dosage levels each were tested. There was a linear dosage response by both species to the three dosages. Furthermore, there was no difference between responses to the two stereoisomers or their combination by either species at any dosage level. The effects of the two stereoisomers were fully interchangeable and additive. This is the first report of parasitoid responses to stereoisomers of a kairomone. 相似文献
4.
Gerald P. McNeill Philip E. Sonnet 《Journal of the American Oil Chemists' Society》1995,72(2):213-218
Three lipases were compared for their ability to hydrolyze high erucic acid rapeseed oil, with the objective of concentrating
the erucic acid in a single glyceride fraction. Lipase fromPseudomonas cepacia released all fatty acids rapidly and did not result in selective distribution of erucic acid.Geotrichum candidum lipase released C20 and C22 fatty acids extremely slowly, resulting in their accumulation in the di- and triglyceride fractions.
Less than 2% of the total erucic acid was found in the free fatty acid (FFA) fraction. Lipase fromCandida rugosa released erucic acid more slowly than C20 and C18 fatty acids at 35°C but only resulted in a limited accumulation of the
erucic acid in the di- and triglyceride fractions. However, when hydrolysis catalyzed byC. rugosa lipase was carried out below 20°C, the reaction mixture solidified and was composed solely of FFAs and diglycerides. The
diglyceride fraction contained approximately 95% erucic acid while about 20% of the total erucic acid was found in the FFA
fraction. It is concluded that hydrolysis at low temperature withC. rugosa lipase results in a higher purity of erucic acid in the glyceride fraction than can be obtained withG. candidum lipase, but with considerable loss of erucic acid to the FFA fraction. 相似文献
5.
6.
Cuticular rinses of the female stable fly,Stomoxys calcitrans (L.), contained saturated and unsaturated hydrocarbons that incited the male fly to attempt couplation. These compounds present in GLC trappings of the saturated hydrocarbon fraction showing highest biological activity were mono- and dimethyl-substituted hentria- and tritriacontanes. Active trappings from the unsaturated hydrocarbon fraction contained (Z)-9-hentriacontene, (Z)-9-tritriacontene, and methyl-branched hentria- and tritriacontenes. 相似文献
7.
A synthesis of (Z,Z)-11,13-hexadecadienal, a compound previously identified as the major component of the sex pheromone of the female navel orangeworm,Amyelois transitella (Walker), is described. The key step is the reduction of an unsymmetrical conjugated diyne with dicyclohexylborane. This reduction produced theZ,Z isomer with less than 0.5% total of other isomers.Mention of a commercial or proprietary product in this paper does not constitute endorsement of that product by the USDA. 相似文献
8.
P. L. Guss J. H. Tumlinson P. E. Sonnet A. T. Proveaux 《Journal of chemical ecology》1982,8(2):545-556
A sex pheromone has been isolated and identified from virgin females of the western corn rootworm (WCR),Diabrotica virgifera virgifera LeConte. The synthesized compound, racemic 8-methyl-2-decanol propanoate, was equal in attraction to the natural pheromone when tested in the field as a trap bait against three taxa ofDiabrotica known to respond to pheromone extracts from female WCR. Five taxa (D. virgifera virgifera; D. virgifera zeae Krysan and Smith, Mexican corn rootworm;D. longicornis barberi Smith and Lawrence, northern corn rootworm;D. longicornis longicornis (Say); andD. porracea Harold) were attracted to traps baited with 8-methyl-2-decanol propanoate. The response of male northern corn rootworms (NCR) in the field peaked at a relatively low concentration of 8-methyl-2-decanol propanoate and then was severely reduced at the higher concentrations tested. Conversely, the response of male WCR in the field continued to increase up to the highest dose tested. 相似文献
9.
P. E. Sonnet E. C. Uebel W. R. Lusby M. Schwarz R. W. Miller 《Journal of chemical ecology》1979,5(3):353-361
The cuticular alkenes of the female stable fly,Stomoxys calcitrans (L), which were responsible for inducing male fly copulatory behavior are (Z)-9-hentriacontene, (Z)-9-tritriacontene, 13-methyl-1-hen-triacontene and 13-methyl-1-tritriacontene. The identifications of the branched alkenes and the synthesis of these four compounds are described. Bioassays indicate that these materials in combination with previously described methyl branched alkanes are more active than the individual components.Diptera=Muscidae.Mention of proprietary or commercial products in this paper does not constitute an endorsement of this product by the U.S.D.A. 相似文献
10.
P Sonnet J Guillon C Enguehard P Dallemagne R Bureau P Rault S Auvray S Moslemi P Sourdiane S Galopin GE Séralini 《Canadian Metallurgical Quarterly》1998,8(9):1041-1044
The structure-activity relationship study of one of recently described aromatase inhibitors, compound 1 (MR20814), allowed us to design some related derivatives as potential new inhibitors. Among those we synthesized, chlorophenylpyridylmethylenetetrahydroindolizinone 5 (MR20492) exhibited in vitro a ten-fold higher inhibition of the enzyme (IC50 = 0.2 +/- 0.0 microM and Ki = 10.3 +/- 3.3 nM). 相似文献